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november 29, 2001 1 mic2010/2070 mic2010/2070 micrel mic2010/mic2070 usb power controller final information general description the mic2010 is a dual channel usb power switch designed to support the power distribution requirements for usb wakeup from the acpi s3 state. the mic2010 will directly switch its two outputs between a 5v main supply and a 5v auxiliary supply normally provided in atx style power sup- plies. the mic2010 will adjust its current-limit threshold according to the acpi state it is in. in the normal active acpi s0 state the current-limit is set at 500ma minimum per channel satisfying the usb continuous output current specification. in the s3 state the current-limit can be reduced to a value determined by an external resistor to minimize the current that is supplied by the auxiliary supply, thereby ensuring that voltage regulation is maintained even during fault conditions. the mic2010 provides make-before-break switching to en- sure glitch-free transitions between the s3 and s0 states. each channel is also thermally isolated from the other so that a fault in one channel does not effect the other. fault status output signals are also provided indicating overcurrent and thermal shutdown conditions. the mic2070 option latches the output off upon detecting an overcurrent condition lasting for more than 5ms minimum. the output can be reset by either toggling the en inputs of the mic2070-1/-2 or by removing the load. latching the output off provides a circuit breaker mode of operation which re- duces power consumption during fault conditions. micrel, inc. ?1849 fortune drive ?san jose, ca 95131 ?usa ?tel + 1 (408) 944-0800 ?fax + 1 (408) 944-0970 ?http://www.mic rel.com features compliant to usb power distribution specifications two completely independent switches integrated switching matrix supports acpi s0/s3 state transitions without external fet circuits make-before-break switching ensures glitch-free transitions no back-feed of auxiliary supply onto main supply during standby mode bi-level current-limit preserves auxiliary supply voltage regulation in standby mode thermally isolated channels thermal shutdown protection fault status outputs with filter prevents false assertions during hot-plug events circuit breaker options with auto-reset (mic2070) undervoltage lockout applications desktop pcs notebook pcs notebook docking stations lan servers pc motherboard typical application mic2010-1p/-2p v bus d+ d gnd main aux out1 en1 en2 downstream usb port 1 100 f 5v main atx power supply s3# fault1 fault1 v bus d+ d gnd downstream usb port 2 out2 rset1 rset2 gnd 5v standby 82801aa or equivalent slp s3# slp s5# oc0 oc1 overcurrent port 1 overcurrent port 1 on/off 1 on/off 2 100 f s3# control figure 1. usb wakeup from acpi s3 system diagram
mic2010/2070 micrel mic2010/2070 2 november 29, 2001 pin configuration 1 fault1 en1 s3# rset1 aux nc rset2 gnd 16 fault2 en2 out1 out1 main main out2 out2 15 14 13 12 11 10 9 2 3 4 5 6 7 8 16-pin qsop (qs) ordering information fault circuit breaker temperature part number enable output function range package mic2010-1cqs* active high open-drain 0 c to +70 c 16-lead qsop mic2010-1pcqs* active high internal pull-up 0 c to +70 c 16-lead qsop mic2010-2cqs* active low open-drain 0 c to +70 c 16-lead qsop mic2010-2pcqs active low internal pull-up 0 c to +70 c 16-lead qsop mic2070-1cqs active high open-drain 0 c to +70 c 16-lead qsop mic2070-1pcqs* active high internal pull-up 0 c to +70 c 16-lead qsop mic2070-2cqs* active low open-drain 0 c to +70 c 16-lead qsop mic2070-2pcqs* active low internal pull-up 0 c to +70 c 16-lead qsop * contact factory for availability.
november 29, 2001 3 mic2010/2070 mic2010/2070 micrel pin description pin number pin name pin function 1 fault1 fault status (output): channel 1, active-low; weak pull-up to aux or open- drain. fault1 is asserted low when channel 1 is in a thermal shutdown state or overcurrent condition for more than 5ms. mic2070 latches this output in its asserted state upon overcurrent condition. toggling en1 or removing the load will reset the circuit breaker latch, and deassert fault1. 2 en1 enable (input): channel 1, active-high ( 1) or active-low ( 2). toggling this input also resets the latched output of the mic2070. 3 s3# control (input): when this input is high, the main inputs are connected to out1 and out2 via 100m ? , 500ma mosfet switches. when this input is low, the aux inputs are connected to out1 and out2 via 500m ? mosfet switches with a current-limit threshold specified by external resistors, rset1 and rset2. 4 rset1 current-limt set resistor (input): channel 1. a resistor connected to this input sets the current-limit threshold in aux mode (s3# asserted). the current-limit threshold is determined by approximately 18/rset1. 5 aux auxiliary 5v supply (input): also used as power supply for internal circuitry. 6 nc no connection: this pin may be connected to other pins without restriction. 7 rset2 current-limit set resistor (input): channel 2. a resistor connected to this input sets the current-limit threshold in aux mode (s3# asserted). the current-limit threshold is determined by approximately 18/rset2. 8 gnd ground 9, 10 out2 channel 2 (output): both pins must be connected together externally. 11, 12 main 5v main supply (input): all main inputs must be connected together externally. 13, 14 out1 channel 1 (output): both pins must be connected together externally. 15 en2 enable (input): channel 2, active-high ( 1) or active-low ( 2). toggling this input also resets the latched output for the mic2070. 16 fault2 fault status (output): channel 2, active-low; weak pull-up to aux or open- drain. fault2 is asserted low when channel 2 is in a thermal shutdown state or overcurrent condition for more than 5ms. mic2070 latches this output in it's asserted state upon overcurrent condition. toggling en2 or removing load will reset the circuit breaker latch, and deassert fault2.
mic2010/2070 micrel mic2010/2070 4 november 29, 2001 absolute maximum ratings (note 1, note 4) supply voltage (v in ) ........................................ 0.3v to 6v fault#, out1, out2 output pins ................. 0.3v to 6v fault1,fault2, output current .............................. 25ma esd rating, note 3 ...................................................... 2kv operating ratings (note 2) supply voltage (v main, v aux ) ..................... +4.5v to +5.5v continuous output current (aux mode) .. 50ma to 300ma ambient temperature (t a ) ........................... 0 c to +70 c junction temperature (t j ) ....................... internally limited package thermal resistance qsop ( ja ) ........................................................ 163 c/w electrical characteristics v main = 5v; aux = 5v; r set = 125 ? , t a = 25 c. symbol parameter condition min typ max units v main main supply voltage 4.5 5.0 5.5 v i main main supply current s3# = 1, both switches on, no load 16 22 a note 5 s3# = 1, both switches off, no load 5 a i leak main reverse leakage current, s3# = 0, both switches on, v main = 0v 10 +10 a note 5 v aux aux supply voltage 4.5 5.0 5.5 v i aux aux supply current, note 5 s3# = 0; no load, both switches on .6 1 ma s3# = 0; no load, both switches off 5 a v uv/aux aux undervoltage lockout v aux increasing 3.5 3.7 4.0 v threshold v aux decreasing 3.3 3.5 3.8 v v hys aux undervoltage lockout 200 mv hysteresis r dsmain main on-resistance, each output s3# = 1, i out = 500ma 100 140 m ? r dsaux aux on-resistance, each output s3# = 0, i out = 100ma 500 700 m ? i limit main current-limit threshold, s3# = 1, v out = 4.0v, ramped load 0.5 1.25 a main short-circuit current-limit v out = 0v 0.5 1.25 a current-limit factor (aux supply), s3# = 0, i out = 50ma to 300ma 14.4 18 21.6 a ? note 6 v out = 4v v th s3#, en1, en2 high-to-low transition .8 1.5 v input threshold voltage low-to-high transition 1.7 2.0 v i in s3#, en1, en2 input current v s3/en =5v, 0v 11 a v hys en1, en2 and s3# input hysteresis 200 mv i off out1, 2 leakage current outputs are off, v out = 0 10 10 a pull-up current during latched outputs latched off tbd 1 tbd ma output state (mic2070-x only) v th latch latch reset threshold v out rising 1.95 v minimum output slew rate output rising .4 v/s to reset latch (mic2070-x only), note 7 overtemperature threshold t j increasing, single channel 140 c t j decreasing, single channel 120 c t j increasing, both channels 160 c t j decreasing, both channels 125 c v ol fault1, 2 output low voltage i fault = 5ma 0.2 v fault1, 2 output off current v fault = 5v 0.2 10 a (not applicable for 'p' versions)
november 29, 2001 5 mic2010/2070 mic2010/2070 micrel symbol parameter condition min typ max units v oh fault1, 2 output high voltage i fault = 20 a4v (mic2010-1p, 2p), (mic2070-1p, 2p) t h main to s3# hold time, note 7 figure 5 5 ms t s main to s3# set-up time, note 7 figure 5 0 ms t dly fault delay filter response time output shorted to ground, figure 4 5 10 20 ms (overcurrent only), note 8 t oc overcurrent response time output shorted to ground, figure 4 main output 2 s aux output 2 s t on(main) main output turn-on time r l = 10 ? , c l = 1 f, figure 3 2 ms t off(main) main output turn-off time r l = 10 ? , c l = 1 f, figure 3 35 s t r(main) main output rise time r l = 10 ? , c l = 1 f, figure 3 2 ms t f(main) main output fall time r l = 10 ? , c l = 1 f, figure 3 32 s t on(aux) aux output turn-on time r l = 50 ? , c l = 1 f, figure 3 0.6 ms t off(aux) aux output turn-off time r l = 50 ? , c l = 1 f, figure 3 120 s t r(aux) aux output rise time r l = 50 ? , c l = 1 f, figure 3 0.5 ms t f(aux) aux output fall time r l = 50 ? , c l = 1 f, figure 3 115 s t xma main to aux s3# transition to 0 5 7.5 ms cross conduction time, note 9 t xam aux to main s3# transition to 1 5 7.5 ms cross conduction time, note 9 note 1. exceeding the absolute maximum rating may damage the device. note 2. the device is not guaranteed to function outside its operating rating. note 3. devices are esd sensitive. handling precautions recommended. human body model, 1.5k in series with 100pf. note 4. all voltages are referenced to ground. note 5. for mic2070-1(p) off occurs when v en < 0.8v and on occurs when v en > 2.4v. for mic2070-2(p) off occurs when v en > 2.4v and on occurs when v en < 0.8v. note 6. current-limit threshold is defined by the current-limit factor divided by r set . note 7. guaranteed by design. not production tested. note 8. assumes only one channel in current-limit. delay circuitry is shared among channels so it is possible for t dly to be 40ms max if one channel enters current-limit as the other is about to time-out. note 9. cross conduction time is the duration in which both main and aux internal switches are on subsequent to s3# transitioning. test circuit device under test c l out r l v out i out timing diagram 90% v out 10% 90% 10% t r t f
mic2010/2070 micrel mic2010/2070 6 november 29, 2001 v en 50% 90% v out 10% t off t on figure 2. mic2010/70-1 v en 50% 90% v out 10% t off t on figure 3. mic2010/70-2 output shorted to ground v out fault# i limit t oc t dly i out figure 4. overcurrent response timing main t h s3# 1.5v t s 1.5v figure 5. main to s3# timing
november 29, 2001 7 mic2010/2070 mic2010/2070 micrel functional description the mic2010/2070 are designed to support the power distri- bution requirements for usb wakeup from the acpi s3 state. it integrates two independent channels under control of input s3#. when s3# is asserted low (acpi s3 state) the mic2010/ 2070 will switch a 500m ? mosfet switch from the aux input to each of its two outputs. in addition the current-limit threshold will be set to a value specified by a resistor connected to the rset inputs. conversely when the s3# input is high the mic2010/2070 will switch a 100m ? mosfet switch from the main inputs to each of its two outputs. the current-limit threshold is preset to 500ma in this state. the lower current limit during the acpi s3 state helps to ensure that the standby supply maintains regulation even during fault conditions. 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. thermal shutdown shuts off the output mosfet and asserts the fault output if the die temperature reaches 140 c and the overheated channel is in current limit. the other channel is not affected. if however, the die temperature exceeds 160 c, both channels will be shut off even if neither channel is in current limit. power dissipation the device s junction temperature depends on several fac- tors such as the load, pcb layout, ambient temperature and package type. the power dissipated in each channel is p d = r ds(on) i out 2 where r ds(on) is the on-resistance of the internal mosfets and i out is the continuous output current. 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: functional diagram current limit 10ms timer charge pump + gate control s3# en current limit main out aux rset /fault aux latch to other channel * main fet aux fet *mic2070-1/2 only thermal sense * 'p' options only tj = 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 of each channel is preset inter- nally at 500ma when s3# is deasserted. when s3# is asserted the current-limit threshold is specified by a resistor connected to the rset input. the value of the current-limit threshold is determined by the equation 18/r set ohms where r set is the resistance connected between the rset pin and ground. the current-limit threshold should be set at 1.2x of the applications continous output current requirement. when an overcurrent condition lasts longer than t dly the mic2070 will activate an internal circuit breaker that will latch the output off and assert fault. the output will remain off until either the load is removed or en is toggled. when the mic2070 enters a latched output condition a 1ma pull-up current source is activated. this provides a way to automati- cally reset the output once the load is removed without the need to toggle the enable input. please refer to figure 7 for timing details. the mic2010 will automatically reset its output when the die temperature cools down to 120 c. the mic2010 output and fault signal will continue to cycle on and off until the device is disabled or the fault is removed. figure 6 depicts typical timing. depending on pcb layout, package, ambient tem- perature, etc., it may take several hundred milliseconds from the incidence of the fault to the output mosfet being shut
mic2010/2070 micrel mic2010/2070 8 november 29, 2001 off. this time duration will be shortest in the case of a dead short on the output. fault status output the fault signal is an active-low output with a weak pull- up or open-drain configuration. fault is asserted when either an overcurrent or thermal shutdown condition occurs. in the case of an overcurrent condition, fault will be asserted only after the flag response delay time, t dly , has elapsed. this ensures that fault is asserted only upon valid overcurrent conditions and that erroneous error reporting is eliminated. the fault response delay time t dly is typically 10ms. since the delay timer is shared between both channels it is possible for t dly to be extended by an amount equal to the difference between the occurrence of the over-current event in both channels. undervoltage lockout undervoltage lockout (uvlo) prevents the output mosfet from turning on until the aux input exceeds approximately 3.5v. uvlo ensures that the output mosfets remain off to prevent high transient inrush current due to stray or bulk load capacitance. this helps to ensure that the power supply voltage regulation is preserved and also prevents possible damage to sensitive components. en (mic2010-2) v out overcurrent fault thermal shutdown reached fault figure 6. mic2010 system timing en (mic2070-2) v out overcurrent fault load removed output reset fault figure 7. mic2070 system timing output resets when load is removed
november 29, 2001 9 mic2010/2070 mic2010/2070 micrel functional characteristics v main = v aux = 5v c l = 100 f r l = 10 ? aux start-up by uvlo time (500 s/div) v aux (2v/div) fault (2v/div) v out (2v/div) i out (50ma/div) v aux ramps from 0v to 5v v main = s3# = 0v en = [on] r load = 50 ? c load = 1 f v main = v aux = 5v c l = 100 f r l = 10 ? aux shutdown by uvlo time (10ms/div) 2.96v v aux ramps from 5v to 0v v main = s3# = 0v en = [on] r load = 50 ? c load = 1 f v aux (2v/div) fault (2v/div) v out (2v/div) i out (50ma/div) main start-up by uvlo time (500 s/div) 3.20v v main (2v/div) fault (2v/div) v out (2v/div) i out (200ma/div) v main = v aux ;v main & v aux ramp from 0v to 5v s3# = 5v en = [on] r load = 10 ? c load = 1 f s3# = 5v en = [on] r load = 10 c load = 1 f v main = v aux ;v main & v aux ramp from 5v to 0v v main (2v/div) fault (2v/div) v out (2v/div) i out (200ma/div) main shut-down by uvlo time (10ms/div) 2.96v main turn-on response time (250 s/div) v main = v aux =5v s3# = 5v en toggles from [off] to [on] r load = 10 ? c load = 1 f en (5v/div) fault (5v/div) v out (2v/div) i out (200ma/div) main turn-off response time (100 s/div) v main = v aux =5v s3# = 5v en toggles from [on] to [off] r load = 10 ? c load = 1 f en (5v/div) fault (5v/div) v out (5v/div) i out (200ma/div)
mic2010/2070 micrel mic2010/2070 10 november 29, 2001 aux turn-on response time (100 s/div) v aux =5v v main = s3# = 0v en toggles from [off] to [on] r load = 50 ? c load = 1 f en (5v/div) fault (5v/div) v out (5v/div) i out (50ma/div) aux turn-off response time (100 s/div) v aux =5v v main = s3# = 0v en toggles from [on] to [off] r load = 50 ? c load = 1 f en (5v/div) fault (5v/div) v out (5v/div) i out (50ma/div) turn-on from s3# to aux time (100 s/div) v aux =5v, v main = 0v en = [on] s3# toggles from [hi] to [low] r load = 50 ? c load = 1 f s3# (5v/div) fault (5v/div) v out (5v/div) i out (50ma/div) turn-off from aux to s3# time (1ms/div) v aux =5v, v main = 0v s3# toggles from [lo] to [hi] en = [on] r load = 50 ? c load = 1 f s3# (5v/div) fault (5v/div) v out (2v/div) i out (50ma/div) main inrush current into c load time (500 s/div) c l = 560 f c l = 100 f c l = 10 f v main = v aux = 5v s3# = 5v en toggles from [off] to [on] r load = open c load = 10 f, 100 f, 560 f en (5v/div) fault (5v/div) v out (5v/div) i out (500ma/div) main-ramped to short by mosfet 1.4a time (50ms/div) v main = v aux =5v s3# = 5v, en = [on] c load = 1 f fault (5v/div) v out (2v/div) i out (500ma/div) r load toggles from > 1k ? to <0.5 ?
november 29, 2001 11 mic2010/2070 mic2010/2070 micrel aux ramped to short by mosfet time (25ms/div) v aux = 5v v main = s3# = 0v, en = [on] rl oad toggles from >1k ? to <0.5 ? c load = 1 f fault (5v/div) v out (2v/div) i out (100ma/div) main turn-on into short time (2.5ms/div) 1.2a v main = v aux =5v s3# = 5v en toggles from [off] to [on] r load = short c load = 1 f en (5v/div) fault (5v/div) v out (5v/div) i in (500ma/div) aux turn-on into short time (2.5ms/div) v aux =5v v main = s3# = 0v en toggles from [off] to [on] c load = 100 f en (5v/div) fault (5v/div) v out (2v/div) i out (100ma/div) aux inrush current into large c load time (2.5ms/div) 230ma v aux =5v v main = s3#= 0v en toggles from [off] to [on] i load < 10ma c load = 220 f en (5v/div) fault (10v/div) v out (5v/div) i in (50ma/div) aux inrush current into small c load time (100 s/div) v aux =5v v main = s3# = 0v en toggles from [off] to [on] i load < 10ma c load = 10 f en (5v/div) fault (10v/div) v out (5v/div) i in (50ma/div) main-to-aux cross conduction time (250 s/div) 950 s v main = v aux = 5v s3# toggles from [hi] to [lo] en = [on] r load = 50 ? c load = 1 f s3# (5v/div) i aux (50ma/div) v out (5v/div) i main (50ma/div)
mic2010/2070 micrel mic2010/2070 12 november 29, 2001 aux-to-main cross conduction time (1ms/div) 3.96ms v main = v aux =5v s3# toggles from [lo] to [hi] en = [on] r load = 50 ? c load = 1 f s3# (5v/div) v out (5v/div) i aux (50ma/div) i main (50ma/div)
november 29, 2001 13 mic2010/2070 mic2010/2070 micrel micrel inc. 1849 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 web http://www.micrel.com this information is believed to be accurate and reliable, however no responsibility is assumed by micrel for its use nor for an y infringement of patents or other rights of third parties resulting from its use. no license is granted by implication or otherwise under any patent or pat ent right of micrel inc. ? 2001 micrel incorporated package information 45 0.2284 (5.801) 0.2240 (5.690) seating plane 0.009 (0.2286) ref 0.012 (0.30) 0.008 (0.20) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) 0.016 (0.40) 0.0688 (1.748) 0.0532 (1.351) 0.196 (4.98) 0.189 (4.80) 0.025 (0.635) bsc pin 1 dimensions: inches (mm) 0.0098 (0.249) 0.0040 (0.102) 0.0098 (0.249) 0.0075 (0.190) 8 0 16-pin qsop (qs)

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