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mic2090/mic2091 current limiting power distribution switches micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com general description the mic2090 and mic2091 are high-side mosfet power switches optimized for general-purpose 50ma or 100ma low power distribution in circ uits requiring over-current limiting and circuit protection. typical applications for these parts are for switching power in usb ports, portable consumer items, camera and camcorder motor protection, thermal printer head protection, and many other low current-load switch ing applications. the mic2090 and mic2091 come in two versions: auto- retry current limit and output latch off on an over current fault. the mic2090 and mic2091 are offered in a space saving 5-pin sot-23 package with an operating junction temperature range of -40 c to +125 c. data sheets and support documentation can be found on micrel?s web site at: www.micrel.com . features ? 1.8v to 5.5v supply voltage ? 790 m ? typical r dson at 3.3v ? mic2090 is rated for 50ma minimum continuous current ? mic2091 is rated for 100ma minimum continuous current ? reverse current blocking (ogi) ? 20ns super fast reaction time to hard short at output ? 10ms fault flag delay (t d_fault/ ) eliminates false assertions ? auto-retry overcurrent and short-circuit protection (-1 version) ? latch-off on current limit (-2 version) ? thermal shutdown ? fault status flag indicates: over-current, over- temperature, or uvlo ? under-voltage lockout (uvlo) ? low quiescent current applications ? usb peripherals ? camcorder ? dsc ? mp3/ipod ? sd protection ? usb low-power hub _________________________________________________________________________________________________________________________ typical application mic2091 usb power switch startup into short circuit july 2011 m9999-070611-b
micrel, inc. mic2090/mic2091 july 2011 2 m9999-070611-b ordering information part number marking current limit current-limit recovery junction temperature range package mic2090-1ym5 l1 k 50ma auto-retry ?40c to +125 c sot-23-5 MIC2091-1YM5 m1 k 100ma auto-retry ?40c to +125 c sot-23-5 mic2090-2ym5 l2 k 50ma latch-off ?40c to +125 c sot-23-5 mic2091-2ym5 m2 k 100ma latch-off ?40c to +125 c sot-23-5 pin configuration 5-pin sot-23 (m5) pin description pin number pin name pin function 1 vin supply (input): +1.8v to +5.5v. provides po wer to the output switch and the mic2090/mic2091 internal control circuitry. 2 gnd ground. 3 en enable (input): active-high ttl compatible cont rol input. a high signal turns on the internal switch and supplies power to the load. this pin cannot be left floating. 4 fault/ fault status (output): open drai n output. can be connected to ot her open drain outputs. must be pulled high with an external resistor. when en=0, fault/ pin is high when en=1, a low on the fault/ pin indicates one or more of the following conditions: 1. the part is in current limit and is turned off. 2. the part is in therma l limit and is turned off. 3. the part is in uvlo 5 vout switched output (output): the voltage on this pin is controlled by the internal switch. connect the load driven by the mic2090/mic2091 to this pin.
micrel, inc. mic2090/mic2091 july 2011 3 m9999-070611-b absolute maximum ratings (1) supply voltage (v in ) ..................................... ? 0.3v to + 6.0v output voltage (v out ). ................................. ? 0.3v to + 6.0v fault/ pin voltage (v fault/ ) ....................... ? 0.3v to + 6.0v fault/ pin current (i fault/ ) .......................................25ma en pin voltage (v en )........................... ? 0.3v to (v in + 0.3v) power dissipation (p d ) ..............................internally limited maximum junction temperature (t j )......................... 150 c storage temperature (t s )......................... ? 65 c to + 150 c lead temperature (sol dering, 10s)............................ 260 c esd hbm rating (3) ......................................................... 3kv esd mm rating (3) .........................................................200v operating ratings (2) supply voltage (v in )..................................... +1.8v to +5.5v output voltage (v out ) .................................. +1.8v to +5.5v en pin voltage (v en ).............................................. 0v to v in fault/ pin voltage (v fault/ ) .............................. 0v to 5.5v fault/ pin current (i fault/ ) ......................................... 1ma ambient temperature (t a ) .......................... ?40c to +85c junction temperature (t j ) ........................ ?40c to +125c package thermal resistance sot23-5 ( ja ) ...............................................252.7c/w electrical characteristics (4) v in = 5v; t a = 25 c, bold values indicate ?40 c t a + 85 c, unless noted. symbol parameter condition min. typ. max. units power input supply v in input voltage range 1.8 5.5 v shutdown current v en 0.5v (switch off), v out = open 5 10 i vin supply current v en 1.5v (switch on), v out = open 70 110 a v uvlo under-voltage lockout threshold v in rising 1.75 v v uvlo_hys under-voltage lockout threshold hysteresis 100 mv enable input enable logic level high (5) v ih (min) 1.5 v en enable logic level low (5) v il (max) 0.5 v i en enable bias current v en = 5v 0.1 a t on output turn-on delay r l = 500 ? , c l = 0.1f see ?timing diagrams? 215 s t r output turn-on rise time r l = 500 ? , c l = 0.1f see ?timing diagrams? 5 s t off output turn-off delay r l = 500 ? , c l = 0.1f see ?timing diagrams? 125 s t f output turn-off fall time r l = 500 ? , c l = 0.1f see ?timing diagrams? 115 s internal switch mic2090 v in = 5.0v, i out = 50ma 700 1200 mic2090 v in = 3.3v, i out = 50ma 790 1200 mic2090 v in = 1.8v, i out = 50ma 1300 mic2091 v in = 5.0v, i out = 100ma 700 1200 mic2091 v in = 3.3v, i out = 100ma 790 1200 r dson on resistance r ds(on) mic2091 v in = 1.8v, i out = 100ma 1300 m? input-to-output leakage current (forward leakage current) mic2090 and mic2091, v en 0.5v, (output off), v in = 5.5v, v out = 0v 10 a
micrel, inc. mic2090/mic2091 july 2011 4 m9999-070611-b electrical characteristics (4) (continued) v in = 5v; t a = 25 c, bold values indicate ?40 c t a + 85 c, unless noted. symbol parameter condition min. typ. max. units output to input leakage current (reverse leakage current) mic2090 and mic2091, v en 0.5v, (output off), v out = 5.5v, v in = 0v 10 a current limit mic2090 @ v out = 4.5v 50 75 100 mic2090 @ v out = 0v 50 100 150 mic2091 @ v out = 4.5v 100 150 200 i limit current-limit threshold mic2091 @ v out = 0v 100 175 250 ma t sc_resp short-circuit response time short circuit applied to output after switch is turned on, see ?timing diagrams?. v in = 3.3v. 20 ns t autorestart time after switch shuts down from an over- current condition before it tries to turn on again. 30 60 90 ms fault/ flag error flag output voltage output voltage high (1ma sinking) 0.4 v t d_fault/ time after switch comes into current limit before the pin fault/ is pulled low. when an over-current condition happens, the part will go into constant output current for this time. after this time it will turn off the output and pull low the pin fault/. the mic2090-1 and mic2091-1 will automatically restart themselves after the auto restart time t autorestart . 5 10 20 ms t r_fault/ fault/ rising time fault/ is connected to v in = 5v through 10k ? and 100pf in parallel. see ?timing diagrams? 5 s t f_fault/ fault/ falling time 1 s reverse voltage protection (ogi) ogi output voltage greater than input voltage (ogi) if the output voltage is greater than the input voltage by this amount, the part will shut down. the enable pin must be recycled to reset. 85 mv ogi time time that the output voltage can be greater than the input voltage bef ore the chip is shut down. 10 ms thermal protection t j rising 150 t overtemp over-temperature shutdown t j falling 140 c no tes: 1. exceeding the absolute maximum rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. handli ng precautions recommended. human body mo del, 1.5k in series with 100pf. 4. specification for packaged product only. 5. v il(max) = maximum positive voltage applied to the input whic h will be accepted by the device as a logic low. v ih(min) = minimum positive voltage applied to the input which will be accepted by the device as a logic high.
micrel, inc. mic2090/mic2091 july 2011 5 m9999-070611-b timing diagrams output rise and fall times (t r , t f ) switch delay time (t on , t off )
micrel, inc. mic2090/mic2091 july 2011 6 m9999-070611-b typical characteristics v in shutdown current vs. input voltage 0 2 4 6 8 10 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) supply current (a) v in supply current vs. input voltage 40 50 60 70 80 1.52.02.53.03.54.04.55.05.5 input voltage (v) supply current (a) enable thresholds vs. input voltage 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) enable threshold (v) v en rising v en falling current limit vs. input voltage mic2090 70.0 80.0 90.0 100.0 110.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) current limit (ma) i limit @ v out = 0.9v * v out i limit @ v out = 0v fault/ delay vs. input voltage (mic2090) 7.0 7.2 7.4 7.6 7.8 8.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) delay (ms) c load = 10 f auto-reset time vs. input voltage (mic2090) 58.0 58.5 59.0 59.5 60.0 60.5 61.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) delay (ms) current limit vs. input voltage mic2091 150.0 160.0 170.0 180.0 190.0 200.0 210.0 220.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) current limit (ma) i limit @ v out = 0.9v * v out i limit @ v out = 0v switch on resistance vs. input voltage 0.5 0.7 0.9 1.1 1.3 1.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) resistance ( ? ) i out = 10ma output turn-on delay vs. input voltage 185 190 195 200 205 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) delay ( s) c load = 0.1 f r load = 500 ?
micrel, inc. mic2090/mic2091 july 2011 7 m9999-070611-b typical characteristics (continued) output rise time vs. input voltage 0 1 2 3 4 5 6 7 8 1.52.02.53.03.54.04.55.05.5 input voltage (v) rise time ( s) c load = 0.1 f r load = 500 ? output turn-off delay vs. input voltage 29 30 31 32 33 34 35 1.52.02.53.03.54.04.55.05.5 input voltage (v) delay ( s) c load = 0.1 f r load = 500 ? output fall time vs. input voltage 70 80 90 100 110 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) fall time ( s) c load = 0.1 f r load = 500 ? ogi threshold vs. input voltage 50 60 70 80 90 100 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) ogi threshold (mv) ogi delay vs. input voltage 5 6 7 8 9 10 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 input voltage (v) delay (ms) v in shutdowncurrent vs. temperature 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 -40 -15 10 35 60 85 temperature (c) shutdown current (a) v in = 5v v in = 1.8v v in supply current vs.temperature 40 45 50 55 60 65 70 75 80 -40 -15 10 35 60 85 temperature (c) supply current (a) v in = 5v v in = 1.8v r load = 0 enable threshold vs. temperature 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35 1.40 -40 -15 10 35 60 85 temperature (c) enable threshold (v) v en rising v en falling v in = 5.0v current limit vs. temperature (mic2090) 70 72 74 76 78 80 82 84 86 88 90 92 94 96 -40 -15 10 35 60 85 temperature (c) current limit (ma) v in = 5.0v i limit @ v out = 0v i limit @ v out = 4.5v
micrel, inc. mic2090/mic2091 july 2011 8 m9999-070611-b typical characteristics (continued) current limit vs. temperature (mic2090) 70 75 80 85 90 95 100 105 110 -40 -15 10 35 60 85 temperature (c) current limit (ma) v in = 1.8v i limit @ v out = 0v i limit @ v out = 1.6v fault/ delay vs. temperature (mic2090) 6.5 7.0 7.5 8.0 8.5 -40 -15 10 35 60 85 temperature (c) delay (ms) v in = 5v v in = 1.8v auto-reset time vs. temperature (mic2090) 58 59 60 61 62 63 64 65 66 -40 -15 10 35 60 85 temperature (c) delay (ms) v in = 1.8v v in = 5.0v current limit vs. temperature (mic2091) 140 150 160 170 180 190 200 210 220 230 240 -40 -15 10 35 60 85 temperature (c) current limit (ma) v in = 1.8v i limit @ v out = 0v i limit @ v out = 1.6v current limit vs. temperature (mic2091) 140 150 160 170 180 190 -40 -15 10 35 60 85 temperature (c) current limit (ma) v in = 5.0v i limit @ v out = 0v i limit @ v out = 4.5v r ds(on) vs. temperature 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 -40 -15 10 35 60 85 temperature (c) resistance ( ? ) v in = 5.0v v in = 1.8v i out = 10ma output turn-on delay vs. temperature 185 190 195 200 205 210 215 -40 -15 10 35 60 85 temperature (c) delay ( s) v in = 1.8v v in = 5.0v c load = 0.1 f r load =500 ? output rise time vs. temperature 0 1 2 3 4 5 6 7 -40 -15 10 35 60 85 temperature (c) rise time ( s) v in = 1.8v v in = 5.0v c load = 0.1 f r load =500 ? output turn-off delay vs. temperature 25 27 29 31 33 35 -40 -15 10 35 60 85 temperature (c) delay ( s) v in = 1.8v v in = 5.0v c load = 0.1 f r load =500 ?
micrel, inc. mic2090/mic2091 july 2011 9 m9999-070611-b typical characteristics (continued) output fall time vs. temperature 60 70 80 90 100 110 120 -40 -15 10 35 60 85 temperature (c) fall time ( s) v in = 1.8v v in = 5.0v c load = 0.1 f r load =500 ? ogi threshold vs. temperature 0 20 40 60 80 100 120 -40 -15 10 35 60 85 temperature (c) ogi threshold (mv) v in = 1.8v v in = 5.0v ogi delay vs. temperature 7.6 7.8 8.0 8.2 8.4 8.6 8.8 9.0 -40 -15 10 35 60 85 temperature (c) delay (ms) v in = 1.8v v in = 5.0v v in uvlo thresholds vs. temperature 1.0 1.1 1.2 1.3 1.4 -40 -15 10 35 60 85 temperature (c) v in ulvo thresholds (v) v in rising v in falling
micrel, inc. mic2090/mic2091 july 2011 10 m9999-070611-b functional characteristics
micrel, inc. mic2090/mic2091 july 2011 11 m9999-070611-b functional characteristics (continued)
micrel, inc. mic2090/mic2091 july 2011 12 m9999-070611-b functional characteristics (continued)
micrel, inc. mic2090/mic2091 july 2011 13 m9999-070611-b functional characteristics (continued)
micrel, inc. mic2090/mic2091 july 2011 14 m9999-070611-b functional diagram mic2090/mic2091 func tional diagram
micrel, inc. mic2090/mic2091 july 2011 15 m9999-070611-b functional description v in and v out v in is both the power supply connection for the internal circuitry driving the switch and the input (source connection) of the power mosfet switch. v out is the drain connection of the power mosfet and supplies power to the load. in a typical circuit, current flows from v in to v out toward the load. when the switch is disabled, current will not flow to the load, except for a small unavoidable leakage current of a few microamps (forward leakage current). c in a minimum 1 f bypass capacitor positioned close to the v in and gnd pins of the switch is both good design practice and required for proper operation of the switch. this will control supply transi ents and ringing. without a sufficient bypass capacitor, large current surges or a short may cause sufficient ringing on v in (from supply lead inductance) to cause erratic operation of the switch?s control circuitry. for best performance, place a ceramic capacitor next to the ic. an additional 10f (or greater) capacitor, positioned close to the vin and gnd pi ns of the switch is necessary if the distance betw een a larger bulk capacitor and the switch is greater than three inches. this additional capacitor limits input voltage transients at the switch caused by fast changing input currents that occur during a fault condition, such as current limit and thermal shutdown. when bypassing with capacitors of 10 f or more, it is good practice to place a smaller value capacitor in parallel with the larger to handle the high-frequency components of any line transients. values in the range of 0.1 f to 1 f are recommended. again, good quality, low-esr capacitors, preferably ceramic, should be chosen. c out an output capacitor is required to reduce ringing and voltage sag on the output during a transient condition. a value between 1 f and 10 f is recommended. a 10 f or larger capacitor should be used if the distance between the mic2090/mic2091 and the load is greater than three inches. the internal switch in the mic2090/mic2091 turns off in (typically) 20ns. this extremely fast turn-off can cause an inductive spike in the output voltage when the internal switch turns off during an overcurrent condition. the larger value capacitor prevents the output from glitching too low. limitations on c out the part may enter current limit when turning on with a large output capacitance, which is an acceptable condition. however, if the part remains in current limit for a time greater than t d_fault , the fault/ pin will assert low. the maximum value of c out may be approximated by equation 1: in_max n d_fault_mi limit_min out_max v t i c = eq. 1 where: i limit_min and t d_fault_min are the minimum specified values listed in the electrical characteristic table and v in_max is the maximum input voltage to the switch. current sensing and limiting the mic2090/mic2091 protects the system power supply and load from damage by continuously monitoring current through the on-chip power mosfet. load current is monitored by means of a current mirror in parallel with the power mosfet switch. current limiting is invoked when the load exceeds the over- current threshold. when current limiting is activated in the -1 version, the output cu rrent is constrained to the limit value, and remains at this level until either the load/fault is removed, the load?s current requirement drops below the limiting value, or the switch goes into thermal shutdown. if the ov ercurrent fault is large enough to drop v out below (typically) 1.8v, the internal mosfet turns off very quickly (typically 20ns). this prevents excessive current from flowing through the device and damaging the internal mosfet. the latch-off feature of the -2 version latches the output off when the output current exceeds the overcurrent threshold. v in or the enable pin must be toggled to reset the latch. enable input the en pin is a ttl logic level compatible input which turns the internal mosfet switch on and off. the fault/ pin remains high when the en pin is pulled low and the output is turned off. toggling the enable pin resets the output after an ogi (output greater than input) condition occurs. in the -2 version, toggling the enable pin resets the output after an overcurrent event. fault output the fault/ is an n-channel open-drain output, which is asserted low when the mic2090/mic2091 switch either begins current limiting or enters thermal shutdown.
micrel, inc. mic2090/mic2091 july 2011 16 m9999-070611-b during an overcurrent or short circuit, the fault/ signal asserts after a brief delay period, t d_fault/ , in order to filter out false or transient over-current conditions. the fault/ output is open-drain and must be pulled high with an external resistor. the fault/ signal may be wire-or?d with other similar outputs, sharing a single pull-up resistor. power dissipation and thermal shutdown thermal shutdown is used to protect the mic2090/mic2091 switch from damage should the die temperature exceed a safe operating temperature. thermal shutdown shuts off the output mosfet and asserts the fault/ output if the die temperature reaches the over-temperature threshold, t overtemp . the switch will automatically resume operation when the die temperature cools down to 140c. if resumed operation results in reheat ing of the die, another shutdown cycle will occur and the switch will continue cycling between on and off states until the reason for the overcurrent condition has been resolved. depending upon the pcb layout, package type, ambient temperature, etc., hundreds of milliseconds may elapse from the time a fault occurs to the time the output mosfet will be shut off. this delay is caused because of the time it takes for the die to heat after the fault condition occurs. power dissipation depends on several factors such as the load, pcb layout, ambient temperature, and supply voltage. calculation of power dissipation can be accomplished by equation 2: p d = r ds(on) (i out ) 2 eq.2 to relate this to junction temperature, equation 3 can be used: t j = p d r (j-a) + t a eq. 3 where: t j = junction temperature t a = ambient temperature r (j-a) is the thermal resistance of the package. in normal operation, excessive switch heating is most often caused by an output short circuit. if the output is shorted, when the switch is enabled, the mic2090/mic2091 switch limits the output current to the maximum value. the heat generated by the power dissipation of the switch cont inuously limiting the current may exceed the package and pcb?s ability to cool the device and the mic2090/mic2091 will shut down and signal a fault condition. please see the ?fault output? description for more details on the fault/ output. after the mic2090/mic2091 shuts down, and cools, it will re-start itself if the enable signal remains true. n figure 2, die temperature is plotted against i out assuming a constant ambient temperature of 85c and a worst case internal switch on-resistance (r on ). this plot is valid for both the mic2090 and mic2091. die temperature vs. output current (ambient temperature = 85c) 83 84 85 86 87 88 89 90 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.1 i out (a) die temperature (c) figure 2. die temperature vs. i out i limit vs. i out measured (-1 version only) when the mic2090/mic2091 is current limiting, it is designed to act as a constant current source to the load. as the load tries to pull more than the maximum current, v out drops and the input to output voltage differential increases. when v out drops below 1.8v, then the output switch momentarily turns o ff to insure the internal mosfet switch is not damaged by a very fast short circuit event. when measuring i out in an overcurrent condition, it is important to remember voltage dependence, otherwise the measurement data may appear to indicate a problem when none really exists. this voltage dependence is illustrated in figures 3 and 4. in figure 3, output current is measured as v out is pulled below v in , with the test terminating when v out is 2.5v below v in . observe that once i limit is reached i out remains constant throughout the remainder of the test. figure 4 repeats this test but simulates operation deeper into an overcurrent condition. when v out drops below 1.8v, the switch turns off for a few microseconds before turning back on.
micrel, inc. mic2090/mic2091 july 2011 17 m9999-070611-b figure 3. i out in current limiting for v out > 1.8v figure 4. i out in current limiting for v out < 1.8v under-voltage lock out (uvlo) the mic2090/mic2091 switches have an under-voltage lock out (uvlo) feature that will shut down the switch in a reproducible way when the input power supply voltage goes too low. the uvlo circuit disables the output until the supply voltage exceeds the uvlo threshold. hysteresis in t he uvlo circuit prevents noise and finite circuit impedance from causing chatter during turn-on and turn-off. while di sable by the uvlo circuit, the output switch (power mosfet) is off and no circuit functions, such as fault/ or en, are considered to be valid or operative. ogi (output greater than input) the internal mosfet switch turns off when it senses an output voltage that is greater than the input voltage. this feature prevents continuous current from flowing from the output to the input. if the output voltage rises above v in by the ogi threshold voltage (typically 85mv), the internal mosfet switch turns off after a period of time, specified in the electrical characteristics table as ogi time . the fault/ pin remains high during and after an ogi event. figure 5 shows the output voltage, input current and fault/ pin voltage when the output voltage is raised above the input. reverse current flows through the internal mosfet switch for the ogi time period, until the internal mosfet switch is turned off and the input current goes to 0a. figure 5. ogi event
micrel, inc. mic2090/mic2091 july 2011 18 m9999-070611-b mic2090/mic2091 evalua tion board schematic
micrel, inc. mic2090/mic2091 july 2011 19 m9999-070611-b bill of materials item part number manufacturer description qty. c1, c2 08056d106mat2a avx (1) 10f, 6.3v ceramic capacitor, x5r 2 c3, c4 nf (no fill) 2 r1, r3 crcw06031002frt1 vishay dale (2) 10k, 1%, 0603 resistor 2 r2 nf (no fill) 1 u1 mic2090-1ym5 micrel, inc. (3) current limiting power distribution switch 1 u1 MIC2091-1YM5 micrel, inc. (3) current limiting power distribution switch 0 u1 mic2090-2ym5 micrel, inc. (3) current limiting power distribution switch 0 u1 mic2091-2ym5 micrel, inc. (3) current limiting power distribution switch 0 no tes: 1. avx: www.avx.com . 2. vishay tel: www.vishay.com . 3. micrel, inc.: www.micrel.com .
micrel, inc. mic2090/mic2091 july 2011 20 m9999-070611-b pcb layout recommendations top silk screen top copper
micrel, inc. mic2090/mic2091 july 2011 21 m9999-070611-b pcb layout recommendations (continued) bottom copper bottom silk screen
micrel, inc. mic2090/mic2091 july 2011 22 m9999-070611-b package information 5-pin sot23 (sot23-5)
micrel, inc. mic2090/mic2091 july 2011 23 m9999-070611-b recommended landing pattern micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web http://www.micrel.com micrel makes no representations or warranties with respect to the accuracy or completeness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and micrel disclaims any express or implied warranty relating to the sale and/or use of micrel products including l iability or warranties relating to fitness for a particular purpose, merchantability, or infringement of an y patent, copyright or other intellectual p roperty right. micrel products are not designed or authorized for use as components in life suppor t appliances, devices or systems where malfu nction of a product reasonably be expected to result in pers onal injury. life support devices or systems are devices or systems that (a) are intended for surgical impla into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or systems is a purchaser?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. can nt ? 2011 micrel, incorporated.

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