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quad voltage up and down sequencer and monitor with programmable timing data sheet adm1186 rev. b doc ument feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one techn ology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 781.329.4700 ? 200 8 C 2013 analog devices, inc. all rights reserved. technical suppo rt www.analog.com features powered from 2.7 v to 5.5 v on the vcc pin monitors four s upplies via 0.8% a ccurate c omparators digital c ore supports up and down supply sequencing m ultiple devices can be cascaded (adm1186 - 1) four inputs can be programmed to monitor different vol tage levels with resistor dividers capacitor p rogrammable s upply sequenc e time delays and a timeout delay to 5% accuracy at 25c four o pen - d rain enable outputs open - drain power - good output open - drain sequence complete pin and b idirectional open - drain f au lt pin (adm1186 - 1 only ) applications monitor and alarm f unctions up and d own p ower supply s equencing telecommunication and d ata communication e quipment pc s , s ervers , and notebook pc s general description the adm1186 - 1 and adm1186 - 2 are integrated, four - ch annel voltage monitoring and sequencing devices. a 2.7 v to 5.5 v power supply is required on the vcc pin for power. four precision comparators , vin1 to vin4, monitor four voltage rails . all four comparators shar e a 0.6 v reference and have a worst - case a ccur acy of 0.8%. resistor networks that are external to the vin1, vin2, vin3, and vin4 pins set the undervoltage (uv) trip points for the monitored supply rails. the a dm1186 - 1 and adm1186 - 2 have four open - drain enable outputs, out1 to out4, that are used t o enable power supplies. an open - drain power - good output, pwrgd, indicates whether the four vinx inputs are abov e their uv threshold s. a state machine monitors the state of the up and down pins on the adm1186 - 1 or the up/ down pin on the adm1186 - 2 to control the supply sequencing direction (see figure 2 ) . in the wait start state, a rising edge transition on the up or up/ down pin triggers a power - up sequence. a fall ing edge transition on the down or up/ down pin in the power - up done state triggers a power - down sequence. application diagram 07153-003 5v in en out adp1706 5v in en out adp2107 5v 3.3v aux in en out adp1821 5v in en out adp1706 f au l t u p down d l y_en_out1 d l y_en_out2 d l y_en_out3 d l y_en_out4 blank_d l y pwrgd seq_done vin1 vin2 vin3 vin4 vcc out1 out2 gnd out3 out4 adm 1 186-1 3.3v aux 2.5v aux 2.5v 1.8v 1.2v 3.3v sequence contro l 3.3v aux 1f 100nf 3.3v aux 5v 3.3v aux 5v figure 1.
adm1186 data sheet rev. b | page 2 of 28 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 application diagram ........................................................................ 1 revision history ............................................................................... 2 specifications ..................................................................................... 4 absolute maximum ratings ............................................................ 6 esd caution .................................................................................. 6 pin configurations and function descriptions ........................... 7 typical performance characteristics ............................................. 9 theory of operation ...................................................................... 13 uvlo behavior .......................................................................... 13 power-up sequencing and monitoring................................... 13 operation in power-up done state .................................. 14 power-down sequencing and monitoring ............................. 14 input glitch filtering ................................................................. 14 fault conditions and fault handling ...................................... 14 defining time delays ................................................................ 15 sequence control using a supply rail .................................... 16 automatic startup and automatic retry using a supply rail ... 17 cascading multiple devices .......................................................... 24 outline dimensions ....................................................................... 27 ordering guide .......................................................................... 27 revision history 4/13rev. a to rev. b added automatic startup and automatic retry using a supply rail section and figure 28; renumbered sequentially ............. 17 6/09rev. 0 to rev. a changes to sequence control using a supply rail section ...... 16 5/08revision 0: initial version
data sheet adm1186 rev. b | page 3 of 28 during a power-up sequence, the state machine enables each power supply in turn. the supply output voltage is monitored to determine whether it rises above the uv threshold level within a user defined duration called the blanking time. if a supply rises above the uv threshold, the next enable output in the sequence is turned on. in addition to the blanking time, the user can also define a sequence time delay before each enable output is turned on. the adm1186-1 provides an open-drain pin, seq_done, that is asserted high to provide an indication that a power-up sequence is complete. the seq_done pin allows multiple cascaded adm1186-1 devices to perform controlled power-up and power-down sequences. during a power-down sequence, the enable outputs turn off in reverse order. the same sequence time delays used during the power-up sequence are also used during the power-down sequence as each enable output is turned off; no blanking time is used during a power-down sequence. at the end of a power- down sequence, the seq_done pin is brought low. during sequencing and when powered up, the state machine continuously monitors the part for any fault conditions. faults include a uv condition on any of the inputs or an unexpected control input. any fault causes the state machine to enter a fault handler, which immediately turns off all enable outputs and then ensures that the device is ready to start a new power-up sequence. the adm1186-1 has a bidirectional pin, fault , that facilitates fault handling when using multiple devices. if an adm1186-1 experiences a fault condition, the fault pin is driven low, causing other connected adm1186-1 devices to enter their own fault handling states. the adm1186-1 is available in a 20-lead qsop package, and the adm1186-2 is available in a 16-lead qsop package. 07153-004 power-down done wait start fault handler sequence supply 1 on sequence supply 1 off sequence supply 2 on sequence supply 2 off sequence supply 3 off sequence supply 4 off sequence supply 3 on sequence supply 4 on power-up done sequence up trigger sequence down trigger fault condition occurs in any state figure 2. simplified state machine diagram
adm1186 data sheet rev. b | page 4 of 28 specifications v vcc = 2.7 v to 5.5 v, t a = ?40 c to +85c ; typical values at t a = 25c, unless otherwise noted . table 1 . parameter min typ max unit test conditions /comments vcc pin operating voltage range, v vcc 2.7 3.3 5.5 v under v oltage lockout, v uvlo 2.46 v v vcc f alling under v oltage lockout hysteresis 50 mv supply current, i vcc 146 2 1 0 a steady s tate ; s equence c omplete vin1 to vin4 (vinx) pins input curre nt ? 25 + 25 n a v vinx = 0 v to 1 v ? 100 + 100 n a v vinx = 0 v to 5.5 v ; v vin x can be greater than v v cc input threshold 1 0.5952 0.6000 0.6048 v input glitch immunity positive glitch duration 19.9 26.6 33.2 s 50 mv input overdrive negative glitch duration 2.75 4.7 6.6 s 50 mv input overdrive up, down , and up/ down pins input current ? 100 + 100 n a v up/ down = 0 v to 5.5 v ; v up/ down can be greater than v vcc input threshold 1 1.372 1.4 1.42 8 v input glitch immunity 3.3 6.8 9.7 s 100 mv input overdrive 2.7 4.9 7.9 s 1 v input overdrive dly_ en _ out x and blank_dly pins time delay accuracy 5 9 % e xternal capacitor values of 10 nf to 2.2 f ; e xcludes external capacitor tolerance time delay charge current 14 a time delay threshold 1.4 v time delay discharge resistor 450 out1 to out4 (outx) pins output low voltage, v outl 0.4 v v vcc = 2.7 v, i sink = 2 ma leakage current 1 a outx = 5.5 v v vcc that guarantees valid outputs 1 v output is guaranteed to be either low ( v outl = 0.4 v ) o r giving a valid output level from v vcc = 1 v, i sink = 30 a or v vcc = 1.1 v, i sink = 100 a pwrgd pin output low voltage, v pwrgd l 0.4 v v vcc = 2.7 v, i sink = 2 ma leakage current 1 a pwrgd = 5.5 v v vcc t hat guarantees valid outputs 1 v ou tput is guaranteed to be either low ( v pwrgdl = 0.4 v ) or giving a valid output level from v vcc = 1 v, i sink = 30 a or v vcc = 1.1 v, i sink = 100 a fau lt pin input threshold 1 1.372 1.4 1.42 8 v input glitch immunity 3 .1 5.6 8.1 s 1 v input overdrive output low voltage, v fau ltl 0.4 v v vcc = 2.7 v, i sink = 2 ma leakage current 1 a fau lt = 5.5 v v vcc t hat guarantees valid output s 1 v output is guaranteed to be either low ( v fau lt l = 0.4 v ) or giving a valid output level from v vcc = 1 v, i sink = 30 a or v vcc = 1.1 v, i sink = 100 a
data sheet adm1186 rev. b | page 5 of 28 parameter min typ max unit test conditions /comments seq_done pin output low voltage, v seq _ donel 0.4 v v vcc = 2.7 v, i sink = 2 ma leak age current 1 a seq_done = 5.5 v v vcc t hat guarantees valid output s 1 v output is guaranteed to be either low ( v seq_donel = 0.4 v ) or giving a valid output level from v vcc = 1 v, i sink = 30 a or v vcc = 1.1 v, i sink = 100 a response timing incl ude s input glitch filter and all other internal delays vinx to pwrgd vinx g oing low to high 21.9 28.8 35.2 s 50 mv input overdrive vinx g oing high to low 5.8 7.3 8.9 s 50 mv input overdrive vinx to fau lt , outx low v inx g oing high to low (uv f ault) 6.1 7.5 9.2 s 50 mv input overdrive up, down , and up/ down to fau lt , outx l ow, t udout 5.5 8.6 12.1 s 100 mv input overdrive 5.8 7.7 10.5 s 1 v input overdrive external fau lt to outx low 10 s 1 v input overdrive fault hold time 35 44 54 s u p, up/ down held low 1 input comparators do not include hysteresis on their inputs. the comparator output passes through a digital glitch filter to remove short transients from the input signal that would otherwise drive the state machine.
adm1186 data sheet rev. b | page 6 of 28 absolute maximum rat ings t a = 25c, u nless otherwise noted. table 2 . parameter rating vcc pin ?0.3 v to + 6 v vinx pin s ?0.3 v to + 6 v up, down , up/ down pin s ?0.3 v to + 6 v dly_en_outx, blank_dly pins ?0.3 v to v cc + 0.3 v p wrgd, seq_done, outx pins ?0.3 v to + 6 v fau lt pin ?0.3 v to + 6 v operating temperature range ? 4 0c to + 85c storage temperature range ?65c to +150 c lead temperature convection reflow peak temperature 260c time at peak temperature 30 sec junction temperature 125c st resses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this sp ecification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. table 3 . thermal resistance package type ja unit 16- lead qsop 149.97 c/w 20- lead qsop 125.80 c/w esd caution
data sheet adm1186 rev. b | page 7 of 28 pin configuration s and function descrip tions 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 1 1 vin1 vin2 vin3 down up vin4 gnd out1 out2 out3 seq_done pwrgd out4 dl y_en_out2 dl y_en_out1 f au l t dl y_en_out3 dl y_en_out4 blank_d l y vcc t op view (not to scale) adm 1 186-1 07153-005 07153-006 1 2 3 4 5 6 7 8 16 15 14 13 12 1 1 10 9 vin1 vin2 vin3 d l y_en_out2 up/down vin4 gnd out1 out2 out3 blank_d l y d l y_en_out3 d l y_en_out4 pwrgd out4 vcc t o p view (not to scale) adm 1 186-2 figure 3. adm1186 - 1 pin configuration figure 4. adm1186 - 2 pin con figuration table 4 . pin function descriptions pin no. mnemonic description adm1186 - 1 adm1186 - 2 1 1 gnd chip ground pin. 2 2 vin1 noninverting comparator input . the voltage on this pin is compared with a 0.6 v reference. can b e used to monitor a voltage rail via a resistor divider. the output of this comparator is monitored by the state machine . 3 3 vin2 noninverting comparator input . the voltage on this pin is compared with a 0.6 v reference. can be used to monitor a voltage rail via a resistor divider. the output of this comparator is monitored by the state machine . 4 4 vin3 noninverting comparator input . the voltage on this pin is compared with a 0.6 v reference. can be used to monitor a voltage rail via a resistor divider. the output of this comparator is monitored by the state machine . 5 5 vin4 noninverting comparator input . the voltage on this pin is compared with a 0.6 v reference. can be used to monitor a voltage rail via a resistor divider. the output of this comparat or is monit ored by the state machine . 6 up noninverting comparator input . a rising edge on this pin initiates a power -up sequence when the adm1186 - 1 is in the wait start state. 7 down noninverting comparator input . a falling edge on this pin initiates a power - down sequence when the adm1186 - 1 is in the power - up done state. 6 up/ down noninverting comparator input . a rising edge on this pin initiates a power - up sequence when the adm1186 - 2 is in the wait start state. a falling edge on this pin initiates a power - down sequence when the adm1186 - 2 is in the power - up done state. 8 fau lt active low, bi directional, open - drain pin . when an internal fault is detected by the adm1186 - 1 state mach ine , this pin is asserted low and the set fault state is entered. an external device pulling this pin low also causes the adm1186 - 1 to enter the set fault state. 9 dly_en_out1 timing input. the capacitor connected to this input sets the time delay bet ween the up input initiating a power -up sequence and out1 being asserted high. during a power - down sequence , this input sets the time delay between out1 being asserted low and seq_done being asserted low. 10 7 dly_ en_out2 timing input. the capacitor conne cted to this input sets the time delay between vin1 coming into compliance and out2 being asserted high during a power -up sequence. during a power - down sequence , this input sets the time delay between out2 being asserted low and out1 being asserted low. 1 1 8 dly_ en_out3 timing input. the capacitor connected to this input sets the time delay between vin2 coming into compliance and out3 being asserted high during a power -up sequence. during a power - down sequence , this input sets the time delay between out3 b eing asserted low and out2 being asserted low.
adm1186 data sheet rev. b | page 8 of 28 pin no. mnemonic description adm1186 - 1 adm1186 - 2 12 9 dly_en_out4 timing input. the capacitor connected to this input sets the time delay between vin3 coming into compliance and out4 being asserted high during a power -up sequence. during a power - down sequen ce , this input sets the time delay between out4 being asserted low and out3 being asserted low. 13 10 blank_dly timing input. the capacitor connected to this input sets the blanking time. this is the time allowed between outx being asserted and vinx comin g into compliance; otherwise, the set fault state is entered. 14 seq_done active high, open - drain output. this output is pulled low when v cc = 1 v. when the power -up sequence is complete, seq_done is asserted high. during a power - down sequence, the pin r emains asserted until the time delay set by dly_en_out1 has elapsed. when a fault occurs, this pin is asserted low . 15 11 pwrgd active high, open - drain output . this output is pulled low when v cc = 1 v. the output state of this pin is a logical and functio n of the uv threshold state of the vinx pins. when the voltage on all vinx inputs exceeds 0.6 v , pwrgd is asserted. this output is driven low if the voltage on any vinx pin is below 0.6 v. 16 12 out4 active high, open - drain output . this output is pulled low when v cc = 1 v. during a power -up sequence, this output is asserted high after the time delay set by the capacitor on dly_en_out4 has elapsed. the output is asserted low immediately after a power - down sequence has been initiated. 17 13 out3 active hig h, open - drain output . this output is pulled low when v cc = 1 v. during a power -up sequence, this output is asserted high after the time del ay set by the capacitor on dly_ en_out3 has elapsed. during a power - down sequence, the output is asserted low after th e time delay set by the capacitor on dly_en_out4 has elapsed. 18 14 out2 active high, open - drain output . this output is pulled low when v cc = 1 v. during a power -up sequence, this output is asserted high after the time del ay set by the capacitor on dly_ en _out2 has elapsed. during a power - down sequence, the output is asserted low after the time delay set by the capacitor on dly_en_out3 has elapsed. 19 15 out1 active high, open - drain output . this output is pulled low when v cc = 1 v. during a power -up sequen ce, this output is asserted high after the time delay set by the capac itor on dly_en_out1 has elapsed (adm1186 - 1) or immediately after a rising edge on up/ down (adm1186 - 2). during a power - down sequence, the output is asserted low aft er the time delay set by the capacitor on dly_en_out2 has elapsed. 20 16 vcc positive supply input pin. the operating supply voltage range is 2.7 v to 5.5 v.
data sheet adm1186 rev. b | page 9 of 28 typical performance characteristics 160 140 120 100 80 60 40 20 0 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply voltage (v) supply current (a) 07153-007 figure 5. supply current vs. supply voltage 150 145 140 135 130 125 120 ?40 ?20 0 20 40 60 80 temperature (c) supply current (a) 07153-008 v cc = 2.7v v cc = 3.3v v cc = 5.5v figure 6. supply current vs. temperature 605 604 603 602 601 600 599 598 597 596 595 ?40 0 60 20 ?20 40 80 temperature (c) vin x input threshold (mv) 07153-009 v cc = 3.3v figure 7 . vinx input threshold vs. temperature 38 36 34 32 30 28 26 24 22 20 0 50 100 150 200 overdrive (mv) positive glitch duration (s) 07153-010 v cc = 3.3v figure 8. vinx input positive glitch immunity vs. input overdrive 18 16 14 12 10 8 6 4 2 0 0 50 100 150 200 negative glitch duration (s) v cc = 3.3v overdrive (mv) 07153-011 figure 9. vinx input negative glitch immunity vs. input overdrive 31.0 30.5 30.0 29.5 29.0 28.5 28.0 27.5 27.0 26.5 26.0 ?40 ?20 0 20 40 60 80 temperature (c) positive glitch duration (s) 07153-012 v cc = 3.3v figure 10 . vinx input positive glitch immunity vs. temperature
adm1186 data sheet rev. b | page 10 of 28 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4.2 4.0 negative glitch duration (s) 07153-013 ?40 ?20 0 20 40 60 80 temperature (c) v cc = 3.3v figure 11 . vinx input negative glitch i mmunity vs. temperature 1.43 1.42 1.41 1.40 1.39 1.38 1.37 threshold (v) 07153-014 ?40 0 60 20 ?20 40 80 temperature (c) v cc = 3.3v figure 12 . up, down , up/ down , fault , and time delay trip threshold vs. temperature 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 50 0 100 150 200 overdrive (mv) input glitch duration (s) 07153-015 v cc = 3.3v figure 13 . up, down , and up/ down input glitch immunity vs. input overdrive 9.0 9.5 10.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 input glitch duration (s) 07153-016 temperature (c) ?40 ?20 0 20 40 60 80 v cc = 3.3v figure 14 . up, down , and up/ down input glitch immunity vs. temperature 10.0 9.5 9.0 8.5 8.0 7.5 7.0 6.5 6.0 5.5 5.0 0 200 400 600 800 1000 overdrive (mv) input glitch duration (s) 07153-017 v cc = 3.3v figure 15 . fault input glitch immunity vs. input overdrive 7.0 6.5 6.0 5.5 5.0 input glitch duration (s) 07153-018 ?40 0 60 20 ?20 40 80 temperature (c) v cc = 3.3v figure 16 . fault input glitch immunity vs. temperature
data sheet adm1186 rev. b | page 11 of 28 15.0 14.8 14.6 14.4 14.2 14.0 13.8 13.6 13.4 13.2 13.0 ?40 ?20 0 20 40 60 temperature (c) charge current (a) 07153-019 v cc = 2.7v v cc = 3.3v v cc = 5.5v figure 17 . time delay charge current vs. temperature 1k 100 10 1 10 100 1k 10k capacitor (nf) time delay (ms) 07153-020 figure 18 . time delay vs. capacitor value 600 500 400 300 200 100 0 0 5 10 15 20 25 output sink current (ma) output low voltage (mv) 07153-021 v cc = 2.7v v cc = 3.3v v cc = 5.5v figure 19 . output low voltage vs. output sink current 400 350 300 250 200 150 100 50 0 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply voltage (v) output low voltage (mv) 07153-022 1m a 100 a figure 20 . output low voltage vs. supply voltage 9.0 8.0 7.0 6.0 5.0 8.5 7.5 6.5 5.5 2.7 3.2 3.7 4.2 4.7 5.2 supply voltage (v) response time (s) 07153-023 figure 21 . v in x to fault , outx low response time vs. supply voltage ?40 ?20 0 20 40 60 80 temperature (c) 07153-024 9.0 8.0 7.0 6.0 5.0 8.5 7.5 6.5 5.5 response time (s) figure 22 . v in x to fault , outx low response time vs. temperature
adm1186 data sheet rev. b | page 12 of 28 30 25 20 15 10 5 0 50 100 150 200 overdrive (mv) response time (s) 07153-025 v cc = 3.3v figure 23 . vinx to fa ult , outx low response time vs. input overdrive 10.0 9.0 8.0 7.0 6.0 9.5 8.5 7.5 6.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply voltage (v) response time (s) 07153-026 figure 24 . up, down , u p/ down to fault , outx low response time vs. supply voltage
data sheet adm1186 rev. b | page 13 of 28 theory of operation the operation of the adm1186 is described in the following sections. where necessary, differences between the adm1186-1 and the adm1186-2 are noted. figure 29 is a detailed functional block diagram of the adm1186-1, and figure 31 is a detailed functional block diagram of the adm1186-2. the operation of the adm1186 is described in the context of a typical voltage monitoring and sequencing application, as shown in figure 1. this example uses the adm1186-1, because it is essentially a superset of the functionality of the adm1186-2. in the example application, the adm1186-1 turns on four regulators, monitors four separate voltage rails, and generates a power-good signal to turn on a microcontroller when all power supplies are on and above their uv threshold level. figure 35 shows a typical adm1186-2 voltage sequencing and monitoring application. uvlo behavior the adm1186 is designed to ensure that the outputs are always in a known state for a v cc supply voltage of 1 v or greater; if the v cc supply voltage is below 1 v, the state of the outputs is not guaranteed. figure 25 shows the behavior of the outputs over the full v cc supply range. 07153-027 under state machine control uvlo active all outputs low outputs not guaranteed 1v 0v v uvlo 2.7v 5.5v v cc figure 25. adm1186 output behavior over v cc supply as the v cc supply begins to rise, an undervoltage lockout (uvlo) circuit becomes active and begins to pull the outputs of the adm1186 low. the outputs are not guaranteed to be low until the v cc supply has reached 1 v. state machine operation is also disabled, so it is not possible to initiate a power-up sequence. this behavior ensures that enable pins on dc-to-dc converters or point-of-load (pol) devices connected to the outx pins are held low as the supplies are rising. this prevents the dc-to-dc converters or the pols from switching on briefly and then switching off as the supply rails stabilize. when v cc rises above v uvlo and the internal reference is stable, the uvlo circuit enables the state machine. the state machine takes control of the outputs and begins operation from the set fault state. after the fault hold time elapses, the state machine moves to the clear fault state. if the up (adm1186-1) or up/ down (adm1186-2) pin is low, the state machine can exit the clear fault state. this change is indicated on the adm1186-1 by the fault pin being asserted high. for the adm1186-2, there is no external indication that the part is ready to perform sequencing, so 0.5 ms should be allowed after v cc comes up before attempting to start a power-up sequence. power-up sequencing and monitoring in the example shown in figure 1, the main supply of 3.3 v powers up the device via the vcc pin. the state machine remains in the wait start state until either a rising edge on the up pin initiates a power-up sequence, or a fault condition occurs. the adm1186-2 requires a rising edge on the up/ down pin to start a power-up sequence. if a rising edge on the up pin is detected, the state machine moves to the delay 1 state. the adm1186-2 does not have a dly_en_out1 pin, so it omits the delay 1 state. figure 30 shows the adm1186-1 state machine in detail; figure 32 shows the adm1186-2 state machine. the waveforms for a typical power-up and power-down sequence when no faults occur are shown in figure 33 (adm1186-1) and figure 34 (adm1186-2). in the delay 1 state, a time delay, set by the capacitor connected to the dly_en_out1 pin, is allowed to elapse. then, in the enable out1 state, the out1 pin is asserted high. out1 is an open-drain, active high output, and in this application it enables the output of a 2.5 v regulator. during the enable out1 state, the vin1 pin monitors the 2.5 v supply after a blanking delay, set by the capacitor on the blank_dly pin. the blanking delay, which is the same for all supplies, is set to allow the slowest rising supply sufficient time to switch on. an external resistor divider scales the supply voltage down for monitoring at the vin1 pin (see figure 26). the resistor ratio is selected so that the vin1 voltage is 0.6 v when the supply voltage rises to the uv level at start-up (a voltage below the nominal 2.5 v level). in figure 26, r1 is 7.4 k and r2 is 2.5 k, so a voltage level of 2.375 v corresponds to 0.6 v on the noninverting input of the first comparator. vin1 r2 2.5k ? r1 7.4k ? 0.6v adm1186 2.5v 2.375v 0v v t to logic core 2.375v supply gives 0.6v at vin1 pin 07153-028 figure 26. setting the undervoltage threshold with an external resistor divider
adm1186 data sheet rev. b | page 14 of 28 if the output of the 2.5 v regulator meets the uv level when the blanking time elapses , the state machine continue s the power - up sequence , moving into the delay 2 state . a time delay, set by the capacitor connected to the dly_en_out2 pin, elapses before turning on the next enable output , out2 , in the enable out2 state. if the 1.8 v supply does not rise to the uv level before the blanking time elapses , sequencing immediately stops and the state machine enters the set fault state. the same scheme is implemented with the other output and input pins. every supply turned on via an output pin , outx , is monitored via an input pin , vin x , to check that the supply has risen above the uv level within the blanking time before the state machine mov es on to the next supply. when a supply is on an d operating correctly , the adm1186 continues to monitor it for the duration of the power - up sequence . if any supply drops below its uv threshold level during a power - up sequence , sequencing stops and the state machine enters the set fault state. w hen the s tate machine is in the wait start state , or at any time during a power - up sequence , a falling edge on the down pin (adm1186 - 1) or the up/ down pin (adm1186 - 2) generates a fault. the pwrgd pin is asserted high, i ndependently of the state machine, when all four vinx pins are above their uv threshold. the state machine in the adm1186 - 1 indicates th at th e power - up sequence is complete by asserting the seq_done pin high. operation in power - up done state when the power - up sequence is complete, the sta te machine remains in the power - up done state until one of the following events occur s: ? a falling edge occurs on the down (adm1186 - 1 ) or up/ down (adm1186 - 2) pin , initiating a po wer - down sequence . ? an u nder v oltage condition occurs on one or more of vin1 to vin4 , generating a fault . ? a rising edge occurs on the up pin , generating a fault (adm1186 - 1 only) . ? an external device brings the fault pin low , causing a f ault (adm1186 - 1 only) . power - down sequencing and monit oring w hen the adm1186 is in the power - up done state , a falling edge on the down or up/ down pin initiates a power - down sequence (see figure 30 or figure 32) . the state machine moves to the disable out4 state, bringing the out4 pin low and switching off the 3 .3 v regulator . a time delay , set by the capacitor on the dly_en_out4 pin , elapses before the state ma chine moves to the disable out3 state. this sequence of steps is repeated until all f our regulators are switched off and the device is in the wait start state . because the adm1186 - 2 does not have a dly_en_out1 pin, there is no delay between the out1 pin being brought low and the state machine returning to the wait start state. when the device is in the wait start state , the seq_done pin is brought low . during a power - down sequence, t he state machine monitors the supplies that are still on. if a supply dro ps below its uv threshold before it is turned off , the power - down sequence immediately stops and the state machine enters the set fault state. a rising edge on the up or up/ down pin during a power - down sequence generates a fault. the pwrgd pin is assert ed low, independently of the state machine power - down sequence, when one or more of the vinx pins drops below 0.6 v. input glitch filteri ng the vinx, up, down , and fault inputs on the adm1 186- 1 and the vinx and up/ down input s on the adm1186 - 2 use a time - based glitch filter to p revent false triggering. the glitch filter avoids the need to use some of the operating supply range to provide hysteresis on an input. this he lps to maximize the available operating supply range for a system , which is especiall y important in systems where low supply voltages are being used . the vinx inputs use a positive glitch filter that is approximately five times longer than the negative gli tch filter . this provides additional glitch immunity during the power - up seque nce as a supply is rising, but still allows for a quick response in the even t of an undervoltage event on an input. f ault conditions a nd fault handling during supply sequen cing a nd operation in the power - up done state , the adm1186 contin uously monitor s the vi nx , up , down , and up/ down pins for fault conditions . the fault pin on the adm1186 - 1 is monitored to detect external faults generated by other devices, which is important during cascade operation. the following faults are internally generated : ? a supply fails to reach the uv threshold within the time defined by the blank_dly capacitor during a power - up s equence . ? a uv condition occurs on vin x after the blanking time has elapsed during a power - up sequence . ? a uv condition occurs on vin x before the supply is disabled during a power - down sequence . ? a falling edge occurs on the down or up/ down pin during a power - up sequence or in the wait start state . ? a rising edge occurs on the up or up/ down pin during a power - down sequence or in the power - up done state .
data sheet adm1186 rev. b | page 15 of 28 the action taken by the adm1186 state machine is the same for an internal or external fault. the state machine enters the set fault stat e , asserts the seq_done and fault pin s low (adm1186 - 1 only) , and asserts all four outx enable pins low . the adm1186 remains in the set fault s tate for the fault hold time before moving into the clear fault state. if the up or up/ down pin is l ow for a time of t t udout before the state machine ent er s the clear fault state , the state machine can move immediately into the wa it all ok state . the length of time from entering the set fault state to reaching the wait all ok state, with the up or up/ down pin held low , is the fault hold time . the fault hold time is the minimum amount of time that the fault pin is held low . if the up or up/ down pin is high when the state machine enters the clear fault state , the time that the fault pin is held low is extended . when the adm1186 - 1 is in the clea r fault state and the up pin is low , the wait all ok state is entered and the fault pin is de asserted. if an external device is driving the fault pin low, the state machine remains in the wait all ok state unti l the fault pin returns high. the state machine then transi tions into the wait start state, ready for the next power - up sequence. defining time delays the adm1186 allows the user to define sequence and blanking time delays using capa citors. the adm1186 - 1 has four dly_en_outx pins , and the adm1186 - 2 has three dly_en_outx pins. capacito rs connected to these pins control the time delay between supplies turning on or off during the power - up and power - down sequences. both devices provide o ne pin (blank_dly) to set the blanking time delay. the adm1186 - 1 has a pin called dly_en_out1 that the adm1186 - 2 does not have . the capaci tor on this pin sets the time delay used before enabling out1 during a power - up sequence, as well as the time delay be tween disabling out1 and returning to the wait start state during a power - down sequence. although this time delay is not essential when a single adm1186 - 1 device is used, the time delay is essential when multiple devices are cascaded (see the cascading multiple devices section) . when adm1186 - 1 devices are used in cascade, the capa c itor on the dly_en_out1 pin of device n + 1 sets the sequence time delay between the last supply of device n and the first supply of d evice n + 1 being t urned on and off . during the power - up sequence, the capacitor s connected to the dly_en _ out x pins set the time from the end of the blanking period to the next enable output being asserted high . during the power - down sequence , the capacitor s set the time bet ween consecutive enable outputs being asserted low. the blanking time is controlled by the capacitor on the blank_dly pin. this capacitor sets the time allowed between an enable output being asserted , turning on a supply , and the output of the supply risi ng above its defined uv threshold. a constant current source is connected to a capacitor through a switch that is under the control of the state machine. this current source charges a capacitor until the threshold voltage is reached. for all capacitors , t he duration of the time delay is defined by the following formula : t delay = c delay 0.1 w here: t de l ay is the time delay in seconds . c de l ay is the capacitor value in micro f arads ( f ) . for capacitor values from 10 nf to 2.2 f , the tim e delay is in the range of 1 ms to 220 ms. if a capacitor is not connected to a timing pin , the time delay is minimal, in the order of several microseconds. when a capacitor is not being charged by the current source, it is conne cted via a resistor to ground. each cap acitor has a dedicated resistor with a typical value of 4 50 . t o ensure accurate time delays , time must be allowed for a capacitor to discharge after it has been used. typically , allowing five rc time constants is su fficient for the capac itor to discharge to less than 1% of the threshold voltage. if the capacitors are not sufficiently discharged after use , the time delays will be smaller than expected. this can happen if very small capacitor values are used or if a po wer - up or power - down sequence is performed immediately after a nother sequence has been completed. examples of when this behavior can occur include, but are not limited to, the following: ? a power - down sequence is initiated immediately after entering the pow er - up done state . ? a fault occurs in the enable out1 state when the dly_en_out1 capacitor is charged and a power - up sequence is started very quickly after the fault has been handle d . ? the dly_en_outx time delay is very short and is insuffi - cient to allow the blank_dly capacitor to fully discharge . t o achieve the best timing accuracy over the operational temperature range , the choice of capacitor is critical. capacitors are typically specified with a value tolerance of 5 % , 10% , or 20%, but in addition to th e value tolerance , there is also a variation in capacitance over temperature. where high accuracy timing is important , the u se of capacitors that use a c0g, sometimes called npo, dielect ric result s in a capacitance variation of only 0 .3 % over the full tem perature r ange. this capacitance variation contrasts with typical varia - tions of 15% for x5r and x7r dielectrics and 22 % for x7s capac itor dielectrics.
adm1186 data sheet rev. b | page 16 of 28 sequence control u sing a supply rail the up and down inputs on the adm1186 - 1 an d the up/ down input on the adm1186 - 2 are used to initiate power - up and power - down sequenc es. these inputs are designed for use with digital or analog signals, such as power supply rail s . using a power supply rail to control the up an d down sequencing allows the adm1186 to perform sequencing and monitoring functions for five supply rails. when using a supply rail to control an adm1186 - 1 ( with the up and down pins connected ) or an adm1186 - 2 , some hysteresis is r equired. the hysteresis is added on the joined up and down pins of the adm1186 - 1 or on the up/ down pin of the adm1186 - 2 to ensure that a slowly ramping suppl y rail does not cause spurious rising or falling edge s that would otherwise cause state machine faults. to provide the necessary hysteresis, a single additional resistor ( rh in figure 27) is connected between the joined up and down pins of the adm1186 - 1 and t he out1 pin of the device, or between the up/ down pin of the adm1186 - 2 and the out1 pin of the device. 07153-038 v i n 3 . 3 v u p o u t 1 ? + vp d o w n ? + ad m 1186 - 1 s ta te machine r1 r p r2 rh vcc 1.4v figure 27 . using a supply rail to control sequencing with hysteresis when out1 is low , the resistor rh sinks current from the node at the midpoint of r1 and r2, slightly increasing the vin voltage needed to start a power - up sequence, referred to as v h . when out1 is high , rh sources current into the midpoint of r1 and r2, decreasing the vin voltage necessary to start a power - down sequence, referred to as v l . the hysteresis at the vin node is simply v h ? v l . as the r1 and r2 resistors scale vin down, the hysteresis on vin is also scaled down. the scaled hysteresis, v shys , at the inputs to the up and down pins (adm1186 - 1) or the up/ down pin (adm1186 - 2) must be at least 75 mv. the value of rh is selected to ensure that this is the case. ? ? ? ? ? ? ? ? ? ? ? ? + + = 1 4 . 1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? ? + = 4 . 1 4 . 1 4 . 1 ( ) ? ? ? ? ? ? + ? = in the ex ample application shown in figure 27 , the following values could be used: rp = 10 k vp = 5 v vin = 3.3 v the values of the r1 and r2 resistors determine the midpoint of the hysteresis, v mid , about which v h and v l set the levels at which power - up and power - down sequences are initiated. for a 3.3 v supply, a threshold just below 3 v cou ld be used, making r1 = 11 k and r2 = 10 k and giving a midpoint of 2.94 v. ( ) ( ) k 10 k 10 k 11 4 . 1 4 . 1 + = + = v mid = 2.94 v as a general rule, t he value for rh is approximately 60 times the value of r1 in parallel with r2. in this example, r1 in parallel with r2 i s 5.24 k, so rh would be approximately 314 k. taking a value of 300 k for rh and using this value in the previous equations for v h , v l , and v shys , the following values are obtained: ? ? ? ? ? ? ? ? ? ? ? ? + + = k 300 k 10 k 300 k 10 k 11 1 4 . 1 v h v h = 2.991 v ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? + ? ? + = k 10 k 300 4 . 1 5 k 10 4 . 1 k 11 4 . 1 v l v l = 2. 8 1 2 v ( ) ? ? ? ? ? ? + ? = k 10 k 11 k 10 812 . 2 991 . 2 shys v v shys = 0.085 v because the value of v shys is greater than the 75 mv of scaled hysteresis required , the rh resistor value selected is sufficient. if the value of v shys obtained is too small, the value of rh can be reduced, incr easing the scaled hysteresis provided.
data sheet adm1186 rev. b | page 17 of 28 a uto matic s tartup and auto matic r etry u sing a s upply r ail it is not possible to directly connect the v cc supply to the up pin (adm1186 - 1) or to the up/ down pin (adm1186 - 2) to start a sequence as the v cc comes up. when the uvlo circuit enables the state machine, it begins in the fault handler states. to reach the wait start state so that sequencing can begin, the up pin (adm1186 - 1) or the up/ down pin (adm1186 - 2) must be held low after the state machine is enabled. the circuit shown in figure 28 can be used to make the adm1186 - 1 automatically start and automatically retry in the event of fault. r2 100k? 100k? c del a y 07153-128 r1 5v 5v 5v down u p adm 1 186-1 s ta te machine 1.4v f au l t out1 r h figure 28 . configuration for a utomatic startup and retry after fault when a fault occurs and the fault hold time elapses, the state machine enters the clear fault state. the adm1186 - 1 remains in this state until a low voltage is applied at the up pin. the low voltage at the fault pin causes the voltage at the node of the up and down pin connection to fall. this allows the state machine to advance from the clear fault state, in readiness fo r a new power - up sequence. the f ault pin is then asserted high followed by the up pin after a delay set by c delay .
adm1186 data sheet rev. b | page 18 of 28 glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter 0.6v 1.4v 1.4v vin1 vin2 vin3 f au l t down up vin4 gnd pwrgd vcc out1 out2 out3 out4 seq_done adm 1 186-1 sta te machine 07153-029 ca p aci t or mux and discharge dl y_en_out3 dl y_en_out4 blank_d l y dl y_en_out2 dl y_en_out1 14 a 450? rising edge detect f alling edge detect figure 29 . functional block diagram of the adm1186 - 1
data sheet adm1186 rev. b | page 19 of 28 set f au l t out1: low out4: low out2: low seq_done: low out3: low f au l t ou t : low w ait s t art out1: low out4: low out2: low seq_done: low out3: low f au l t ou t : high w ait al l ok f au l t ou t : high enable out1 out1: high del a y 1 enable out2 out2: high del a y 2 enable out3 out3: high del a y 3 enable out4 out4: high disable out1 out1: low disable out2 out2: low disable out3 out3: low disable out4 out4: low del a y 4 clear f au l t f au l t hold times out exit uvlo f f f f f f up: low up: rising edge f f f au l t in: low down: f alling edge after blanking del a y vin1: low f au l t in: low down: f alling edge vin1: low f au l t in: low down: f alling edge after d l y_en_out1 time del a y f au l t in: low down: f alling edge vin1: low after blanking del a y vin2: low after d l y_en_out2 time del a y after d l y_en_out3 time del a y after blanking del a y vin1: high after blanking del a y vin2: high after blanking del a y vin3: high f au l t in: low down: f alling edge vin1 or vin2: low f au l t in: low down: f alling edge vin1 or vin2 or vin3: low after blanking del a y vin4: high f au l t in: low up: rising edge vin1 or vin2 or vin3 or vin4: low f au l t in: low down: f alling edge vin1 or vin2: low after blanking del a y vin3: low after d l y_en_out4 time del a y f au l t in: low down: f alling edge vin1 or vin2 or vin3: low after blanking del a y vin4: low power-u p done seq_done: high f f f f f f f down: f alling edge f au l t in: low after d l y_en_out4 time del a y after d l y_en_out3 time del a y after d l y_en_out2 time del a y after d l y_en_out1 time del a y down: f alling edge f au l t in: low up: rising edge vin1 or vin2 or vin3: low f au l t in: low up: rising edge vin1 or vin2: low f au l t in: low up: rising edge vin1: low f au l t in: low up: rising edge 07153-030 f au l t in: high figure 30 . adm1186 - 1 state machine operation
adm1186 data sheet rev. b | page 20 of 28 glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter glitch fi l ter 0.6v 1.4v 1.4v vin1 vin2 vin3 up/down vin4 gnd pwrgd vcc out1 out2 out3 out4 adm 1 186-2 sta te machine 07153-031 ca p aci t or mux and discharge dl y_en_out3 dl y_en_out4 blank_d l y dl y_en_out2 14 a 450? edge detect figure 31 . functio nal block diagram of the adm1186 - 2
data sheet adm1186 rev. b | page 21 of 28 07153-032 set f au l t w ait s t art out1: low out3: low out2: low out4: low enable out1 out1: high enable out2 out2: high del a y 2 enable out3 out3: high del a y 3 enable out4 out4: high disable out1 out1: low disable out2 out2: low disable out3 out3: low disable out4 out4: low del a y 4 f au l t hold times out exit uvlo f f f f f f after blanking del a y vin1: high after blanking del a y vin2: high up/down: f alling edge after blanking del a y vin1: low after d l y_en_out2 time del a y f f f f f f f after d l y_en_out4 time del a y after d l y_en_out3 time del a y after d l y_en_out2 time del a y up/down: f alling edge up/down: rising edge vin1: low up/down: rising edge vin1 or vin2: low up/down: rising edge vin1 or vin2 or vin3: low up/down: rising edge up/down: rising edge out1: low out3: low out2: low out4: low up/down: f alling edge vin1: low up/down: f alling edge vin1 or vin2: low after blanking del a y vin3: high after blanking del a y vin4: high up/down: f alling edge vin1 or vin2 or vin3: low up/down: f alling edge vin1: low after blanking del a y vin2: low after d l y_en_out3 time del a y up/down: f alling edge vin1 or vin2: low after blanking del a y vin3: low after d l y_en_out4 time del a y up/down: f alling edge vin1 or vin2 or vin3: low after blanking del a y vin4: low power-u p done vin1 or vin2 or vin3 or vin4: low up/down: low clear f au l t figure 32 . adm1186 - 2 state machine operation
adm1186 data sheet rev. b | page 22 of 28 07153-033 up dly_en_out1 out1 dly_en_out2 out2 dly_en_out3 out3 dly_en_out4 out4 blank_dly seq_done pwrgd down 12 34 6 7 10 12 11 89 5 13 14 1 state names 1 - wait start 2 - delay 1 3 - enable out1 4 - delay 2 5 - enable out2 6 - delay 3 7 - enable out3 8 - delay 4 9 - enable out4 10 - power-up done 11 - disable out4 12 - disable out3 13 - disable out2 14 - disable out1 figure 33. adm1186-1 typical power- up and power-down sequence waveforms with corresponding state names 07153-037 out1 dly_en_out2 out2 dly_en_out3 out3 dly_en_out4 out4 blank_dly pwrgd up/down 12 3 4 5 678 9 10 11 1213 1 state names 1 - wait start 2 - enable out1 3 - delay 2 4 - enable out2 5 - delay 3 6 - enable out3 7 - delay 4 8 - enable out4 9 - power-up done 10 - disable out4 11 - disable out3 12 - disable out2 13 - disable out1 figure 34. adm1186-2 typical power- up and power-down sequence waveforms with corresponding state names
data sheet adm1186 rev. b | page 23 of 28 07153-034 5v in en out adp1706 5v in en out adp2107 5v 3.3v aux in en out adp1821 5v in en out adp1706 up/down d l y_en_out2 d l y_en_out3 d l y_en_out4 blank_d l y pwrgd vin1 vin2 vin3 vin4 vcc out1 out2 gnd out3 out4 adm 1 186-2 2.5v aux 2.5v 1.8v 1.2v 3.3v sequence contro l 1f 100nf 3.3v aux 5v 3.3v aux 5v figure 35 . adm1186 - 2 typical application
adm1186 data sheet rev. b | page 24 of 28 cascading multiple d evices multiple adm118 6 - 1 devices can be cascade d in applications that require more than four supplies to be sequenced and monitored . when adm1186 - 1 devices ar e cascade d , the controlled power - up and power - down of all the cascaded supplies is maintained using only three pins on each device. there are several configurations for interconnecting these devices. the mos t suitable configuration depends on the application. figure 36 and figure 37 show two methods for cascading multiple adm1186 - 1 devices. figure 36 shows a single sequence of 12 supplies. the capacitors used for timing are not shown in the figure for clarity. to ensure controlled power - up and power - down sequencing of all 12 sup - plies , the followi ng connections are made: ? the up pin of the first device and the down pin of the last device in the cascade chain are connected. ? the seq_done pin of d evice n is connected to the up pin of d evice n + 1 . ? the seq_done pin of d evice n is connected to the down pin of d evice n ? 1 . when the sequence control line goes high, device a begins the power - up sequence , turning on each enable output in turn , with the associated delays , according to the state machine . when device a completes its power - up sequence, the seq_done pin goes from low to high, initiating a power - up sequence on device b . when device b completes its power - up sequence, the device b seq_done pin goes high , initiating a power - up sequence on d evice c. when d evice c completes its power - up sequence and all supplies are above the uv threshold , the system power good signal goes high. if the sequence control line goes low, device c start s a power - down sequence , turning off its enable outputs . when all device c enable outputs are off , the seq_done pin on device c goes low , causing a high - to - low transition on the down pin of device b . this transition initiates a power - down sequence on device b , which takes all its outx pins low , causing seq_done to be taken low. this high - to - low transition is seen by de vice a , which starts its power - down sequence , thus completing the ordered shutdown of the 12 supplies . note t h at th e capacitor on the dly_en_out1 pin of device b (not shown in figure 36) sets the sequence time delay between the la st supply of device a and the first supply of device b being turned on and off. figure 37 shows two independent sequences of four supplies , each with common status outputs. in this example , both devices share the same sequence con trol signal , so they start their power - up and power - down sequences at the same time . both devices must complete their power - up sequences before the power good signal goes high. t he fault pins of all devices in a cascade should be con nected . connecting the fault pins ensures that an undervoltage fault on one device , or an unexpected event such as a rising or falling edge on the up or down pin, generate s a fault condition on all the other de vices . when a n internal fault condition occurs on a device , it pulls its fault pin low . this in turns causes the other adm1186 - 1 devices to enter the set fault state and pull their fault pins low . each device w aits for the fault hold time to elapse and then moves to the clear fault state. if the v cc supply for a n adm1186 - 1 drop s below v uvlo , the uvlo circuit becomes active , and the fault pin is pulled low. this generates a fault condition on all other connected devices. a device in the clear fault state holds its fault pin low until its up input pin is low. the device then moves into the wait all ok state and releases the fault p in . if, for exam ple, a uv fault occurs on a vinx pin during a power - up sequence , the up pin will be high on the first device in the cascade. the first device in the cascade hold s the fault line low until the up pin is brought low. all other devices will have released their fault pins and will be in the wait all ok state. when the up pin goes low , t h e first device releases its fault pin so the fault line returns high , which allows al l devices to move together from the wait all ok state back into the wait start state , ready for the next power - up sequence. an external d evice such as a microcontroller, field programmable gate array ( fpga ) , or an over temperature sensor can cause a fault c ondition by briefly bringing fault low . in this case, the adm1186 - 1 behaves as described. if the external device continues to hold the fault line low, all the adm1186 - 1 devices remain in the wait all ok state, effectively preventing a power - up sequence from starting.
data sheet adm1186 rev. b | page 25 of 28 vin1 vin2 vin3 vin4 up down v1 3.3v v2 v3 v4 gnd vcc ad m 118 6 - 1a out1 out2 out3 3.3v 3.3v 3 . 3 v 3 . 3 v en1 en2 en3 out4 seq_done pwrgd fault en4 en5 en6 en7 en8 enable outputs to regulators with pull-ups as required vin1 vin2 vin3 v i n 4 up down v5 v6 v7 v8 gnd vcc adm1186-1b out1 out2 o u t 3 out4 seq_done pwrgd fault e n 9 en10 e n 11 e n 12 v i n 1 v i n 2 v i n 3 v i n 4 up down v9 v10 v11 v12 g n d v c c ad m 118 6 - 1c o u t 1 o u t 2 o u t 3 o u t 4 seq_done pwrgd fault sequence control s u pp l i es s ca l ed d o w n w i t h r es i s t o r d i v i d e r s power good 07153-035 figure 36 . cascading multiple adm 1186 - 1 devices, option 1
adm1186 data sheet rev. b | page 26 of 28 3.3v vin1 vin2 vin3 vin4 up down 3.3v gnd vcc adm1186-1a out1 out2 out3 en1 no connect no connect en2 en3 out4 seq_done pwrgd fault en4 power good enable outputs to regulators with pull-ups as required en5 en6 en7 en8 v5 v6 v7 v8 sequence control vin1 vin2 vin3 vin4 up down 3.3v gnd vcc adm1186-1b out1 out2 out3 out4 seq_done pwrgd fault 5v v1 v2 v3 v4 supplies scaled down with resistor dividers 07153-036 figure 37 . cascading m ultiple adm 1186 - 1 devices, o ption 2
data sheet adm1186 rev. b | page 27 of 28 outline dimensions compliant to jedec standards mo-137-ad controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. 20 11 10 1 seating plane 0.010 (0.25) 0.004 (0.10) 0.012 (0.30) 0.008 (0.20) 0.025 (0.64) bsc 0.041 (1.04) ref 0.010 (0.25) 0.006 (0.15) 0.050 (1.27) 0.016 (0.41) 0.020 (0.51) 0.010 (0.25) 8 0 coplanarity 0.004 (0.10) 0.065 (1.65) 0.049 (1.25) 0.069 (1.75) 0.053 (1.35) 0.345 (8.76) 0.341 (8.66) 0.337 (8.55) 0.158 (4.01) 0.154 (3.91) 0.150 (3.81) 0.244 (6.20) 0.236 (5.99) 0.228 (5.79) 08-19-2008-a figure 38. 20-lead shrink small outline package [qsop] (rq-20) dimensions shown in inches and (millimeters) compliant to jedec standards mo-137-ab controlling dimensions are in inches; millimeter dimensions (in parentheses) are rounded-off inch equivalents for reference only and are not appropriate for use in design. 16 9 8 1 seating plane 0.010 (0.25) 0.004 (0.10) 0.012 (0.30) 0.008 (0.20) 0.025 (0.64) bsc 0.041 (1.04) ref 0.010 (0.25) 0.006 (0.15) 0.050 (1.27) 0.016 (0.41) 0.020 (0.51) 0.010 (0.25) 8 0 coplanarity 0.004 (0.10) 0.065 (1.65) 0.049 (1.25) 0.069 (1.75) 0.053 (1.35) 0.197 (5.00) 0.193 (4.90) 0.189 (4.80) 0.158 (4.01) 0.154 (3.91) 0.150 (3.81) 0.244 (6.20) 0.236 (5.99) 0.228 (5.79) 01-28-2008-a figure 39. 16-lead shrink small outline package [qsop] (rq-16) dimensions shown in inches and (millimeters) ordering guide model 1 temperature range package description package option adm1186-1arqz ?40c to +85c 20-lead shri nk small outline package [qsop] rq-20 adm1186-1arqz-reel ?40c to +85c 20-lead sh rink small outline package [qsop] rq-20 ADM1186-2ARQZ ?40c to +85c 16-lead shri nk small outline package [qsop] rq-16 ADM1186-2ARQZ-reel ?40c to +85c 16-lead sh rink small outline package [qsop] rq-16 eval-adm1186-1ebz evaluation kit eval-adm1186-1mbz micro-evaluation kit eval-adm1186-2ebz evaluation kit eval-adm1186-2mbz micro-evaluation kit 1 z = rohs compliant part.
adm1186 data sheet rev. b | page 28 of 28 notes ? 2008 C 2013 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d07153 - 0 - 4/13(b)
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