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mic2073/2074 dual-channel power distribution switch general description the mic2073/2074 are high-side mosfet switches optimized for general-purpose power distribution requiring circuit protection. the mic2073/2074 are internally current limited and have thermal shutdown for protecting the device and load. the mic2074 offers ?smart? shutdown that reduces current consumption in fault mode. when a fault occurs due to thermal shutdown, the output is latched off. the mic2074s? output will be reset, enabling the output, either by removing the load or toggling the enable pin. both devices employ soft-start circuitry that minimizes inrush current in applications where highly capacitive loads are employed. a fault status output flag is asserted during overcurrent or thermal shutdown conditions. transient faults are internally filtered. the mic2073/2074 are available in an 8-pin soic. all support documentation can be found on micrel?s web site at: www.micrel.com . features ? 115 m ? typical r b ds(on) at 5.0 v ? 210 m ? maximum r b ds(on) at 5.0 v ? 2.7 v to 5.5 v operating range ? 500 ma minimum continuous current per channel ? short circuit protection with thermal shutdown ? thermally isolated channels ? fault status flag (flga/b) separate for each channel ? 3ms fault flag delay (t d ) eliminates false assertions ? uvlo (undervoltage lockout) ? reverse current flow blocking (no ?body diode?) ? circuit breaker mode (mic2074) ? logic-compatible inputs ? soft-start circuit ? low quiescent current ? pin compatible with the mic2026/2076 applications ? usb peripherals ? general purpose power switching ? acpi power distribution ? notebook pcs ? pdas ? pc card hot swap _________________________________________________________________________________________________ typical application ena outa flga in flgb gnd enb outb on/off overcurrent overcurrent on/off mic2073/74 logic controller v cc 2.7v to 5.5v 0.1f vin load load v cont. 10k 10k micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 ( 408 ) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com january 2009 m9999-011209
micrel, inc. mic2073/2074 january 2009 2 m9999-011209 ordering information part number enable package mic2073-1ym active high MIC2073-2YM active low mic2074-1ym active high mic2074-2ym active low 8- pin soic note: 1. mic2073/2074 are temperature rated from ?40c to +85c 2. mic2073/2074 are all lead free pin configuration 1 ena flga flgb enb 8ou t a in gnd outb 7 6 5 2 3 4 8-pin soic (m) mic2073/2074 pin description pin number pin name pin function 1 ena switch a enable (input): logic-compatible, enable input. active high (-1) or active low (-2). 2 flga fault flag a (output): active-low, open-drain output. low indicates overcurrent or thermal shutdown conditions. overcurrent conditions must last longer than t b d b in order to assert flga. flga pin can be left floating; however, fault status information will not be available. 3 flgb fault flag b (output): active-low, open-drain output. low indicates overcurrent or thermal shutdown conditions. overcurrent conditions must last longer than t b d b in order to assert flgb. flgb pin can be left floating; however, fault status information will not be available. 4 enb switch b enable (input): logic-compatible enable input. active-high (-1) or active-low (-2). 5 outb switch b (output) 6 gnd ground 7 in input: switch and logic supply input. 8 outa switch a (output)
micrel, inc. mic2073/2074 january 2009 3 m9999-011209 absolute maximum ratings p (1) supply voltage (v b in b ) .................................... ?0.3 v to +6 v fault flag voltage (v b flg b ) ..............................................+6 v fault flag current (i b flg b ).............................................25 ma output voltage (v b out b ) ...................................................+6 v output current (i b out b ).................................internally limited enable input (v b en b )...................................... ?0.3 v to 6.0 v storage temperature (t b s b ) .....................?65c to +150 c esd rating (3) hbm ........................................................................ 1 kv mm ........................................................................200 v operating ratings p (2) supply voltage (v b in b ) ................................. +2.7 v to +5.5 v ambient temperature (t b a b )......................... ?40c to +85c junction temperature range (t b j b ) ............ internally limited thermal resistance soic ( b ja b ) .......................................................160c/w electrical characteristics (4) p vin = 5 v; ta = 25c, bold values indicate ?40c ta +85c; unless noted symbol parameter condition min typ max units mic2073-1, v b ena b = v b enb b 0.8 v (switch off), out = open 0.40 5 a mic2073-2, v b ena b = v b enb b 2.4 v (switch off), out = open 7.5 20 a mic2073-1, v b ena b = v b enb b 2.4 v (switch on), out = open 100 160 a i b dd b supply current mic2073-2, v b ena b = v b enb b 0.8 v (switch on), out = open 100 160 a low-to-high transition 1.6 2.4 v v b en b enable input threshold high-to-low transition 0.8 1.40 v v b en_hyst b enable input hysteresis 225 mv i b en b enable input current v b en b = 0 v to 5.5 v -1 0.01 1 a c en enable input capacitance 1 pf mic2073/2074 , v b in b = 5.0 v, i b out b = 500 ma 115 170 m ? r b ds(on) b switch resistance mic2073/2074 v b in b = 3.3 v, i b out b = 500 ma 145 210 m ? output leakage current mic2073-1/2074-1, v enx 0.8 v; mic2073-2/2074-2, v enx 2.4 v, (output off) 10 a off current (thermal shutdown) mic2074, thermal shutdown state 50 a short-circuit output current v b out b = 0v, enabled into short-circuit 0.5 0.7 1.25 a i b limit b current-limit threshold ramped load applied to output 1.0 1.25 a v b in b rising 2.2 2.45 2.7 v v uvlo undervoltage lockout threshold v b in b falling 2.0 2.25 2.5 v i b l b = 10 ma, v b in b = 5.0 v 12 25 error flag output resistance i b l b = 10 ma, v b in b = 3.3 v 14 40 ? error flag off current v b flag b = v b in b 10 a
micrel, inc. mic2073/2074 january 2009 4 m9999-011209 v in = 5 v; t a = 25c, bold values indicate ?40c t a +85c; unless noted (continued) symbol parameter condition min typ max units t sc_resp short-circuit response time v b out b = 0 v, to i out = i limit (short applied to output) 20 s t b on b output turn-on delay r b l b = 10 ? , c b l b = 1 f, see ?timing diagrams? 1.3 5 ms t b r b output turn-on rise time r b l b = 10 ? , c b l b = 1 f, see ?timing diagrams? 0.5 1.15 4.9 ms t b off b output turn-off delay r b l b = 10 ? , c b l b = 1 f, see ?timing diagrams? 35 100 s t b f b output turn-off fall time r b l b = 10 ? , c b l b = 1 f, see ?timing diagrams? 32 100 s v in = 5 v apply v out 0 v until flg low 1.5 4 7 ms t d overcurrent flag response delay v in = 3.3 v apply v out 0 v until flg low 3 ms t b j b increasing, each switch t b j b decreasing, each switch 140 120 c c t overtemp overtemperature threshold (5) t b j b increasing, both switches t b j b decreasing, both switches 160 150 c c notes: 1. exceeding the absolute maximu m rating may damage the device. 2. the device is not guaranteed to function outside its operating rating. 3. devices are esd sensitive. h andling precautions recommended. 4. specification for packaged product only. 5. if there is a fault on one channel, that ch annel will shut down when the die reac hes approximately 140c. if the die reaches approximately 160c, both channels will shut down, even if neither channel is in current limit.
micrel, inc. mic2073/2074 january 2009 5 m9999-011209 test circuit device under test c l out r l v out timing diagrams 90% v out 10% 90% 10% t r t f output rise and fall times v en 50% 90% v out 10% t off t on active-low switch delay times (mic2073-2/2074-2) active-high switch delay time (mic2073-1/2074-1)
micrel, inc. mic2073/2074 january 2009 6 m9999-011209 typical characteristics 0 20 40 60 80 100 120 140 160 180 -40-20 0 20406080100 current (a) temperature (c) supply on-current vs. temperature 5v 3.3v 0 20 40 60 80 100 120 140 160 180 -40-20 0 20406080100 on-resistance (mohms) temperature (c) on-resistance vs. temperature 5v 3.3v i out = 500ma 0 1 2 3 4 5 -40-20 0 20406080100 rise time (ms) temperature (c) turn-on rise time vs. temperature v in = 5v v in = 3.3v 0 50 100 150 200 2.5 3.0 3.5 4.0 4.5 5.0 5.5 current (a) input voltage (v) supply on-current vs. input voltage +85c +25c -40c 0 50 100 150 200 2.5 3.0 3.5 4.0 4.5 5.0 5.5 resistance (mohm) input voltage (v) on-resistance vs. input voltage i out = 500ma +85c +25c -40c 0 0.5 1.0 1.5 2.0 2.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 rise time (ms) input voltage (v) turn-on rise time vs. input voltage +85c +25c -40c 0 200 400 600 800 1000 -40-20 0 20406080100 current limit (ma) temperature (c) short-circuit current-limit vs. temperature v in = 3.3v v in = 5v 0 200 400 600 800 1000 1200 -40-20 0 20406080100 current limit threshold (ma) temperature (c) current-limit threshold vs. temperature v in = 3.3v v in = 5v 0 10 20 30 40 50 60 70 80 90 100 -40-20 0 20406080100 fall time (s) temperature (c) fall time vs. temperature 0 100 200 300 400 500 600 700 800 900 1000 2.5 3.0 3.5 4.0 4.5 5.0 5.5 current limit (ma) input voltage (v) short-circuit current-limit vs. input voltage +85c +25c -40c 0 200 400 600 800 1000 1200 2.5 3.0 3.5 4.0 4.5 5.0 5.5 current limit threshold (ma) input voltage (v) current-limit threshold vs. input voltage +85c +25c -40c 0 10 20 30 40 50 60 70 80 90 100 2.5 3.0 3.5 4.0 4.5 5.0 5.5 rise time (s) input voltage (v) fall time vs. input voltage 25c
micrel, inc. mic2073/2074 january 2009 7 m9999-011209 typical characteristics (continue) 0 0.5 1.0 1.5 2.0 2.5 -40-20 0 20406080100 enable threshold (v) temperature (c) enable threshold vs. temperature v en rising v en falling 0 1 2 3 4 5 -40-20 0 20406080100 delay time (ms) temperature (c) flag delay vs. temperature v in = 3.3v v in = 5v 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 0.65 0.70 0.75 0.80 -40-20 0 20406080100 supply current (a) temperature (c) mic2073-1 supply off current vs. temperature 5v 3.3v 0 0.5 1.0 1.5 2.0 2.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 enable threshold (v) input voltage (v) enable threshold vs. input voltage v en falling v en rising 0 1 2 3 4 5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 delay time (ms) input voltage (v) flag delay vs. input voltage +85c +25c -40c 0.20 0.25 0.30 0.35 0.40 0.45 0.50 0.55 0.60 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply current (a) voltage (v) mic2073-1 supply off current vs. input voltage +85c +25c -40c 0 0.5 1.0 1.5 2.0 2.5 3.0 -40-20 0 20406080100 uvlo threshold (v) temperature (c) uvlo threshold vs. temperature 3.3v 5v 4 5.0 6.0 7.0 8.0 9.0 10.0 -40-20 0 20406080100 supply off-current (a) temperature (c) mic2073-2 supply off-current vs. temperature 3.3v 5v 4 5 6 7 8 9 10 2.533.544.555.5 supply off-current (a) input voltage (v) mic2073-2 supply off-current vs. input voltage -40c 25c 85c
micrel, inc. mic2073/2074 january 2009 8 m9999-011209 functional characteristics
micrel, inc. mic2073/2074 january 2009 9 m9999-011209 functional characteristics (continued)
micrel, inc. mic2073/2074 january 2009 10 m9999-011209 functional characteristics (continue)
micrel, inc. mic2073/2074 january 2009 11 m9999-011209 block diagram mic2073/2074 block diagram functional description thermal shutdown thermal shutdown is employed to protect the device from damage should the die temperature exceed safe margins due mainly to short circuit faults. each channel employs its own thermal sensor. thermal shutdown shuts off the output mosfet and asserts the flg output if the die temperature reaches 140c and the overheated channel is in current limit. the other channel is not affected. if however, the die temperature exceeds 160c, then both channels will be shut off. upon determining a thermal shutdow n condition, the mic2074 will latch the output off. in this case, a pull-up current source is activated. this allows the output latch to automatically reset when the load (such as a usb device) is removed. the output can also be reset by toggling en. refer to figure 1 for timing details. input and output in is the power supply conne ction to the logic circuitry and the drain of the output mosfet. out is the source of the output mosfet. in a typical circuit, current flows from in to out toward the load when the switch is enabled. an important consideration in a choosing switch is whether it has ?reverse volt age protection? that is, does not have a body diode. reverse voltage protection is important when the switch is disabled and a voltage is presented to the out pin that is greater than the vin voltage. the reverse volta ge protection prevents current flow in the reverse path from out to in. on other hand when the switch is enabled the switch is bidirectional. in this case when a voltage is presented to the out pin that is greater than the vin voltage, current will flow from out to in. the mic2073 will automatically reset its output when the die temperature cools down to 120c. the mic2073 output and flg signal will continue to cycle on and off until the device is disabled or the fault is removed. figure 2 depicts typical timing. the output mosfet and driver circuitry are also designed to allow the mosfet source to be externally forced to a higher voltage than the drain (v out > v in ) when the switch is disabled. in this situation, the mic2073/2074 prevents undesi rable current flow from out to in. depending upon pcb layout package, ambient temperature, etc., it may take several hundred milliseconds from the incidence of the fault to the output mosfet being shut off. this time will be shortest in the case of a dead short on the output.
micrel, inc. mic2073/2074 january 2009 12 m9999-011209 power dissipation the device?s junction temperature depends upon several factors such as the load, pcb layout, ambient temperature, and package ty pe. equations that can be used to calculate power dissipation of each channel and junction temperature are found below: p d = r ds(on) i out 2 total power dissipation of the device will be the summation of p d for both channels. to relate this to junction temperature, the following equation can be used: t j = p d ja + t a where: t j = junction temperature t a = ambient temperature ja = is the thermal resistance of the package current sensing and limiting the current-limit threshold is preset internally. the preset level prevents damage to the device and external load but still allows a minimum current of 500ma to be delivered to the load. the current-limit circuit sens es a portion of the output mosfet switch current. the current-sense resistor shown in the block diagram is a virtual resistor and has no voltage drop. the reaction to an overcurrent condition varies with three scenarios: ? switch enabled into short-circuit if a switch is enabled into a heavy load or short- circuit, the switch immediately enters into a constant- current mode, reducing the output voltage. the flg signal is asserted indicating an overcurrent condition. ? short-circuit applied to enabled output when a heavy load or short-circuit is applied to an enabled switch, a large transient current may flow until the current-limit circuitry responds. once this occurs, the device limits current to less than the short-circuit current limit specification. ? current-limit response - ramped load the mic2073/2074 current-limit profile exhibits a small foldback effect of about 200ma. once this current-limit threshold is exceeded the device switches into a constant current mode. it is important to note that the device will supply current up to the current-limit threshold. fault flag the flg signal is an n-channel open-drain mosfet output. flg is asserted (active-low) when either an overcurrent or thermal shutdown condition occurs. in the case of an overcu rrent condition, fl g will be asserted only after the flag response delay time, t d , has elapsed. this ensures that flg is asserted only upon valid overcurrent conditions and that erroneous error reporting is eliminated. for example, false overcurrent conditions can occur during hot plug events when a highly capacitive load is connected and causes a high transient inrush current that exceeds the current-limit threshold for up to 1ms. the flg response delay time t d is typically 3ms. undervoltage lockout undervoltage lockout (uvlo) prevents the output mosfet from turning on until v in exceeds approximately 2.5v. undervol tage detection functions only when the switch is enabled. v en v out i out short-circuit fault thermal shutdown reached load and fault removed (output reset) v flg i limit i load 3ms typ. delay figure 1. mic2074-2 fault timing: output reset by removing load
micrel, inc. mic2073/2074 january 2009 13 m9999-011209 v en v out i out short-circuit fault thermal shutdown reached load and fault removed (output reset) v flg i limit i load 3ms typ. delay figure 2. mic2073-2 fault timing application information supply filtering a 0.1f to 1f bypass capacitor positioned close to v in and gnd of the device is strongly recommended to control supply transients. without a bypass capacitor, an output short may cause sufficient ringing on the input (from supply lead inductance) to damage internal control circuitry. printed circuit board hot-plug the mic2073/2074 are ideal inrush current-limiters for hot plug applications. due to their integrated charge pumps, the mic2073/2074 present a high impedance when off and slowly becomes a low impedance as their integrated charge pumps turn on . this ?soft-start? feature effectively isolates power supplies from highly capacitive loads by reducing inrush current. figure 3 shows how the mic2074 may be used in a card hot-plug application. in cases of extremely large capacitive loads (>400f), the length of the transient due to inrush current may exceed the delay provided by the integrated filter. since this inrush current exceeds the current-limit delay specification, flg will be asserted during this time. to prevent the logic controller from responding to flg being asserted, an external rc filter, as shown in figure 4, can be used to filter out transient flg assertion. the value of the rc time constant should be selected to match the length of the transient, less t d(min) of the mic2073/2074. universal serial bus (usb) power distribution the mic2073/2074 are ideally suited for usb (universal serial bus) power distribution applications. the usb specification defines power distribution for usb host systems such as pcs and usb hubs. hubs can either be self-powered or bus-power ed (that is, powered from the bus). figure 5 shows a typical usb host application that may be suited for mobile pc applications employing usb. the requirement for usb host systems is that the port must supply a minimum of 500ma at an output voltage of 5v 5%. in addition, the output power delivered must be limited to below 25va. upon an overcurrent condition, the host must also be notified. to support hot-plug events, the hub must have a minimum of 120f of bulk capacit ance, preferably low esr electrolytic or tantalum. please refer to application note 17 for more details on designing compliant usb hub and host systems. for bus-powered hubs, usb requires that each downstream port be switched on or off under control by the host. up to four downstream ports each capable of supplying 100ma at 4.4v minimum are allowed. in addition, to reduce voltage droop on the upstream v bus , soft-start is necessary. although the hub can consume up to 500ma from the upstream bus, the hub must consume only 100ma max at start-up, until it enumerates with the host prior to requesting more power. the same requirements apply for bus-powered peripherals that have no downstream ports. figure 6 shows a bus-powered hub.
micrel, inc. mic2073/2074 january 2009 14 m9999-011209 ena outa flga flgb gnd outb in 18 27 36 5 usb controller enb 4 usb peripheral cable t o "hot" receptacle c bulk gnd v bus 4.7 f usb function usb function c bulk mic2073/2074 figure 3. hot-plug application figure 4. transient filter
micrel, inc. mic2073/2074 january 2009 15 m9999-011209 1 2 3 4 8 7 6 5 figure 5. usb two-port host application 1 2 3 4 8 7 6 5 figure 6. usb two-port bus-powered hub
micrel, inc. mic2073/2074 january 2009 16 m9999-011209 package information 8-pin soic (m) _________________________________________________________________________________________________ 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 the information furnished by micrel in this data sheet is belie ved to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change ci rcuitry and specifications at any time without notification to the customer. 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 can reasonably be expected to result in personal injury. life support devices or systems ar e devices or systems that (a) are intend ed for surgical implant into the body or (b) support or sustain life, and whose failure to per form can be reasonably expected to result in a significant inj ury to the user. a purchaser?s use or sale of micrel products for use in life support appliances, devices or system s is a purchaser?s own risk and purchaser a grees to fully indemnify micrel for any damages resulting from such use or sale. ? 2009 micrel, incorporated

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