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june 2000 1 mic2027/2077 mic2027/2077 micrel mic2027/2077 quad usb power distribution switch preliminary information general description the mic2027 and mic2077 are quad high-side mosfet switches optimized for general-purpose power distribution requiring circuit protection. the mic2027/77 are internally current limited and have thermal shutdown that protects the device and load. the mic2077 offers ?mart?thermal shutdown that reduces current consumption in fault modes. when a thermal shut- down fault occurs, the output is latched off until the faulty load is removed. removing the load or toggling the enable input will reset the device output. 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 and thermal shutdown conditions. transient current limit faults are internally filtered. the mic2027/77 is available in narrow (150 mil) and wide (300 mil) sop (small outline packages). typical application on/off overcurrent mic2027 3.3v usb controller v bus d+ d gnd v bus d+ d gnd mic5203-3.3 ldo regulator in out gnd 33 f* ferrite bead d+ d v+ ena in flga in enb outa flgb outb bold lines indicate 0.1" wide, 1-oz. copper high-current traces. downstream usb port 1 500ma max. downstream usb port 2 500ma max. 33 f* 0.1 f v bus d+ d gnd v bus d+ d gnd 33 f* enc outd flgc end gnd flgd gnd downstream usb port 3 500ma max. downstream usb port 4 500ma max. 33 f* 0.01 f 0.01 f 0.01 f 0.01 f 4.7 f 1 f gnd 5v 3% * 33 f, 16v tantalum or 100 f, 10v electrolytic per port outc 10k 4-port self-powered hub features 140m ? maximum on-resistance per channel 2.7v to 5.5v operating range 500ma minimum continuous current per channel short-circuit protection with thermal shutdown thermally isolated channels fault status flag with 3ms filter eliminates false assertions undervoltage lockout reverse current flow blocking (no body diode ) circuit breaker mode (mic2077) reduces power consumption logic-compatible inputs soft-start circuit low quiescent current pin-compatible with mic2524 and mic2527 applications usb peripherals general purpose power switching acpi power distribution notebook pcs pdas pc card hot swap 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
mic2027/2077 micrel mic2027/2077 2 june 2000 ordering information part number enable temperature range package mic2027-1bwm active high 40 c to +85 c 16-lead wide sop mic2027-1bm active high 40 c to +85 c 16-lead sop mic2027-2bwm active low 40 c to +85 c 16-lead wide sop MIC2027-2BM active low 40 c to +85 c 16-lead sop mic2077-1bwm active high 40 c to +85 c 16-lead wide sop mic2077-1bm active high 40 c to +85 c 16-lead sop mic2077-2bwm active low 40 c to +85 c 16-lead wide sop mic2077-2bm active low 40 c to +85 c 16-lead sop pin configuration 1 2 3 4 16 15 14 13 flgb enb outb in(a/b) flga ena outa gnd 5 6 7 8 12 11 10 9 gnd outd end flgd in(c/d) outc enc flgc 16-lead sop (m) 16-lead wide sop (wm) logic, charge pump logic, charge pump 3 outa 14 outb 13 in(a/b) ena 2 flga 1 enb 15 flgb 16 logic, charge pump logic, charge pump 6 outc 11 outd 5 in(c/d) enc 7 flgc 8 end 10 flgd 9 12 4 gnd functional pinout
june 2000 3 mic2027/2077 mic2027/2077 micrel absolute maximum ratings (note 1) supply voltage (v in ) ...................................... 0.3v to +6v fault flag voltage (v flg ) .............................................. +6v fault flag current (i flg ) ............................................ 25ma output voltage (v out ) .................................................. +6v output current (i out ) ............................... internally limited enable input (i en ) .................................... 0.3v to v in + 3v storage temperature (t s ) ...................... 65 c to +150 c lead temperature (soldering 5 sec.) ........................ 260 c esd rating, note 3 ...................................................... 1kv operating ratings (note 2) supply voltage (v in ) ................................... +2.7v to +5.5v ambient temperature (t a ) ......................... 40 c to +85 c junction temperature range (t j ) ........... internally limited thermal resistance [300 mil] wide sop ( ja ) .................................. 120 c/w [150 mil] sop ( ja ) ........................................... 112 c/w dip( ja ) ............................................................. 130 c/w pin description pin number pin name pin function 1 flga fault flag a: (output): active-low, open-drain output. low indicates overcurrent or thermal shutdown conditions. overcurrent conditions must last longer than t d to assert flag. 2 ena switch a enable (input): logic-compatible enable input. active high (-1) or active low (-2). 3 outa switch a output 4, 12 gnd ground 5 in(c/d) input: channel c and d switch and logic supply input. 6 outc switch c output 7 enc switch c enable (input) 8 flgc fault flag c (output) 9 flgd fault flag d (output) 10 end switch d enable (input) 11 outd switch d output 13 in(a/b) supply input: channel a and b switch and logic supply input. 14 outb switch b output 15 enb switch b enable (input) 16 flgb fault flag b (output)
mic2027/2077 micrel mic2027/2077 4 june 2000 electrical characteristics 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 i dd supply current mic20x7-1, v ena d 0.8v 1.5 10 a (switch off), out = open mic20x7-2, v ena d 2.4v 1.5 10 a (switch off), out = open mic20x7-1, v ena d 2.4v 200 320 a (switch on), out = open mic20x7-2, v ena d 0.8v 200 320 a (switch on), out = open v en enable input threshold low-to-high transition 1.7 2.4 v high-to-low transition 0.8 1.45 v enable input hysteresis 250 mv i en enable input current v en = 0v to 5.5v ? 0.01 1 a enable input capacitance 1 pf r ds(on) switch resistance v in = 5v, i out = 500ma 100 150 m ? v in = 3.3v, i out = 500ma 110 170 m ? output leakage current mic20x7-1, v enx 0.8v; 10 a mic20x7-2, v enx 2.4v, (output off) output current in mic2077 (per latch output) 50 a latched thermal shutdown (during thermal shutdown state) t on output turn-on delay r l = 10 ? , c l = 1 f, see timing diagrams 1.3 5 ms t r output turn-on rise time r l = 10 ? , c l = 1 f, see timing diagrams 1.15 4.9 ms t off output turnoff delay r l = 10 ? , c l = 1 f, see timing diagrams 35 100 s t f output turnoff fall time r l = 10 ? , c l = 1 f, see timing diagrams 32 100 s i limit short-circuit output current v out = 0v, enabled into short-circuit 0.5 0.9 1.25 a current-limit threshold ramped load applied to output 1.0 1.25 a short-circuit response time v out = 0v to i out = i limit 20 s (short applied to output) t d overcurrent flag response v in = 5v, apply v out = 0v until flg low 1.5 3 7 ms delay v in = 3.3v, apply v out = 0v until flg low 3 ms undervoltage lockout v in rising 2.2 2.4 2.7 v threshold v in falling 2.0 2.15 2.5 v error flag output i l = 10ma, v in = 5v 10 25 ? resistance i l = 10ma, v in = 3.3v 15 40 ? error flag off current v flag = 5v 10 a overtemperature threshold t j increasing, each switch 140 c note 4 t j decreasing, each switch 120 c t j increasing, both switches 160 c t j decreasing, both switches 150 c 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. if there is an output current limit fault on one channel, that channel will shut down when the die reaches approximately 140 c. if the die reaches approximately 160 c, the other channel driven by the same input will shut down, even if neither channel is in current limit.
june 2000 5 mic2027/2077 mic2027/2077 micrel 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 (mic20x7-2) v en 50% 90% v out 10% t off t on active-high switch delay times (mic20x7-1)
mic2027/2077 micrel mic2027/2077 6 june 2000 0 50 100 150 200 250 300 350 -40 -20 0 20 40 60 80 100 current ( a) temperature ( c) supply on-current vs. temperature 5v 3.3v 0 20 40 60 80 100 120 140 160 -40 -20 0 20 40 60 80 100 on-resistance (m ? ) temperature ( c) on-resistance vs. temperature 5v 3.3v i out = 500ma 0 1 2 3 4 5 -40 -20 0 20 40 60 80 100 rise time (ms) temperature ( c) turn-on rise time vs. temperature r l =10 ? c l =1 f v in = 5v v in = 3.3v 0 100 200 300 400 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 +85 c +25 c -40 c 0 50 100 150 200 2.5 3.0 3.5 4.0 4.5 5.0 5.5 resistance (m ? ) input voltage (v) on-resistance vs. input voltage i out = 500ma +85 c +25 c -40 c 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-off rise time vs. input voltage r l =10 ? c l =1 f +85 c +25 c -40 c 0 200 400 600 800 1000 -40 -20 0 20 40 60 80 100 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 20 40 60 80 100 current limit threshold (ma) temperature ( c) current-limit threshold vs. temperature v in = 3.3v v in = 5v 0 100 200 300 400 -40 -20 0 20 40 60 80 100 fall time ( s) temperature ( c) fall time vs. temperature r l =10 ? c l =1 f v in = 3.3v 0 100 200 300 400 500 600 700 800 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 +85 c +25 c -40 c 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 +85 c +25 c -40 c 0 50 100 150 200 250 300 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 t a = 25 c c l = 1 f r l = 10 ?
june 2000 7 mic2027/2077 mic2027/2077 micrel 0 0.5 1.0 1.5 2.0 2.5 -40 -20 0 20 40 60 80 100 enable threshold (v) temperature ( c) enable threshold vs. temperature v in = 5v v en rising v en falling 0 1 2 3 4 5 -40 -20 0 20 40 60 80 100 delay time (ms) temperature ( c) flag delay vs. temperature v in = 3.3v v in = 5v 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 -40 -20 0 20 40 60 80 100 supply current ( a) temperature ( c) 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 t a = 25 c 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 +85 c +25 c -40 c 0 0.05 0.10 0.15 0.20 0.25 0.30 0.35 2.5 3.0 3.5 4.0 4.5 5.0 5.5 supply current ( a) voltage (v) supply off current vs. input voltage +85 c +25 c -40 c 0 0.5 1.0 1.5 2.0 2.5 3.0 -40 -20 0 20 40 60 80 100 uvlo threshold (v) temperature ( c) uvlo threshold vs. temperature v in rising v in falling
mic2027/2077 micrel mic2027/2077 8 june 2000 functional characteristics uvlo v in rising (mic2027-1) time (10ms/div.) i out (100ma/div.) v in (2v/div.) v out (2v/div.) v flg (2v/div.) v en = v in c l = 57 f r l = 35 ? 2.4v uvlo v in falling (mic2027-1) time (100ms/div.) i out (100ma/div.) v in (2v/div.) v out (5v/div.) v flg (2v/div.) v en = v in c l = 57 f r l = 35 ? 2.2v turn-on/turnoff (mic2027-1) time (10ms/div.) i out (200ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v c l = 147 f r l = 35 ? 712ma (inrush current) 140ma turn-on (mic2027-1) time (500 s/div.) i out (200ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v c l = 147 f r l = 35 ? 140ma turnoff (mic2027-1) time (5ms/div.) i out (200ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v c l = 147 f r l = 35 ? 140ma enabled into short (mic2027-1) time (500 s/div.) i out (500ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v 3.1ms (t d ) 700ma
june 2000 9 mic2027/2077 mic2027/2077 micrel inrush current response (mic2027-1) time (1ms/div.) i out (200ma/div.) v en (10v/div.) v flg (5v/div.) v in = 5v r l = 31 ? c l = 10 f c l = 110 f c l = 210 f c l = 310 f current-limit response (ramped load mic2027-1) time (100ms/div.) i out (500ma/div.) v in (10v/div.) v out (5v/div.) v flg (10v/div.) v in = 5v c l = 47 f current-limit threshold (1a) thermal shutdown thermal shutdown hysteresis short removed short-circuit current (800ma) current-limit response (stepped short mic2027-1) time (1ms/div.) i out (2a/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v c l = 47 f r l = stepped short 800ma current-limit response (mic2027-1) time (50 s/div.) i out (5a/div.) v out (5v/div.) v in = 5v c l = 0 r l = stepped short short-circuit (800ma) independent thermal shutdown (mic2027-1) time (100ms/div.) i outb (500ma/div.) v enb (10v/div.) v flgb (5v/div.) v flga (5v/div.) v outa = no load (no thermal shutdown) thermal shutdown v ena = 5v v enb = 5v v enc = 0v v end = 0v independent thermal shutdown (mic2027-1) time (100ms/div.) i outa (500ma/div.) v ena (10v/div.) v flgb (5v/div.) v flga (5v/div.) v outb = no load (no thermal shutdown) thermal shutdown v ena = 5v v enb = 5v v enc = 0v v end = 0v
mic2027/2077 micrel mic2027/2077 10 june 2000 thermal shutdown (mic2077-2 output latched off) no load time (2.5s/div.) i outb (500mv/div.) v out (5v/div.) v flg (10v/div.) v in = 5v c l = 47 f v enb = 0v thermal shutdown load removed output reset r l = 0 thermal shutdown (output reset by toggling enable mic2077-2) time (100ms/div.) i out (500ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v enable reset thermal shutdown output reset ramp load to short c l = 57 f r l = 35 ? thermal shutdown (output reset by removing load mic2077-2) time (100ms/div.) i out (500ma/div.) v en (10v/div.) v out (5v/div.) v flg (5v/div.) v in = 5v c l = 47 f load removed (output reset) output latched off thermal shutdown ramp load to short independent thermal shutdown (mic2077-2) time (2.5s/div.) i outa (500ma/div.) v flga (5v/div.) v flgb (5v/div.) v in = 5v c l = 47 f v enb = 0v v ena = 0v v enc = 5v v end = 5v output reset load removed no thermal shutdown on channel b thermal shutdown r l = 0 no load independent thermal shutdown (mic2077-2) time (2.5s/div.) i outb (500ma/div.) v flga (5v/div.) v flgb (10v/div.) v in = 5v c l = 47 f v enb = 0v v ena = 0v v enc = 5v v end = 5v output reset load removed no thermal shutdown on channel a thermal shutdown r l = 0 no load
june 2000 11 mic2027/2077 mic2027/2077 micrel block diagram 1.2v reference thermal shutdown charge pump outb uvlo gate control in (a/b) reset (mic2077 only) (mic2077 only) (mic2077 only) (mic2077 only) reset reset reset gate control outa flgb charge pump enb osc. flga current limit current limit 1.2v reference thermal shutdown charge pump outd uvlo gate control in (c/d) enc gate control outc flgd charge pump end osc. flgc current limit current limit gnd mic2027 flag delay flag delay flag delay flag delay thermal shutdown latch thermal shutdown latch thermal shutdown latch thermal shutdown latch
mic2027/2077 micrel mic2027/2077 12 june 2000 functional description input and output in is the power supply connection 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. if v out is greater than v in , current will flow from out to in, since the switch is bidirectional when enabled. 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 mic2027/77 prevents undesirable current flow from out to in. 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 140 c and the overheated channel is in current limit. the other channels are not effected. if however, the die temperature exceeds 160 c, all channels will be shut off. upon determining a thermal shutdown condition, the mic2077 will latch the output off and activate a pull-up current source. when the load is removed, this current source will pull the output up and reset the latch. toggling en will also reset the latch. the mic2027 will automatically reset its output when the die temperature cools down to 120 c. the mic2027 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. depending on 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. power dissipation the device s junction temperature depends on several fac- tors such as the load, pcb layout, ambient temperature and package type. 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 all 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 senses a portion of the output mos- fet switch current. the current-sense resistor shown in the block diagram is virtual 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, limiting the output voltage. the flg signal is asserted indicat- ing 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 mic2027/77 current-limit profile exhibits a small foldback effect of about 100ma. 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 overcur- rent condition, flg 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 thresh- old. 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. under- voltage detection functions only when the switch is enabled.
june 2000 13 mic2027/2077 mic2027/2077 micrel 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. mic2077-2 fault timing: output reset by removing load v en v out i out short-circuit fault thermal shutdown reached load/fault removed v flg i load i limit 3ms typ. delay figure 2. mic2027-2 fault timing
mic2027/2077 micrel mic2027/2077 14 june 2000 applications information supply filtering a 0.1 f to 1 f 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 induc- tance) to damage internal control circuitry. printed circuit board hot-plug the mic2027/77 are ideal inrush current-limiters for hot-plug applications. due to the integrated charge pump, the mic2027/77 presents a high impedance when off and slowly becomes a low impedance as it turns on. this soft-start feature effectively isolates power supplies from highly ca- pacitive loads by reducing inrush current. in cases of extremely large capacitive loads (>400 f), 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 flag delay specification, flg will be asserted during this time. to prevent the logic controller from responding to flg being asserted, an exter- nal rc filter, as shown in figure 3, 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 mic2027/77. universal serial bus (usb) power distribution the mic2027/77 is 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- powered (that is, powered from the bus). the requirement for usb self-powered hubs is that the port must supply a mini- mum 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 120 f of bulk capacitance, preferably low esr electrolytic or tantulum. please refer to application note 17 for more details on designing compliant usb hub and host systems. 10k v+ mic2027 flga flgb ena outa outb gnd in(a/b) enb 116 215 314 413 overcurrent logic controller r c 512 611 710 89 in(c/d) gnd outc outd enc end flgc flgd figure 3. transient filter
june 2000 15 mic2027/2077 mic2027/2077 micrel package information 45 0 8 0.244 (6.20) 0.228 (5.79) 0.394 (10.00) 0.386 (9.80) seating plane 0.020 (0.51) ref 0.020 (0.51) 0.013 (0.33) 0.157 (3.99) 0.150 (3.81) 0.050 (1.27) 0.016 (0.40) 0.0648 (1.646) 0.0434 (1.102) 0.050 (1.27) bsc pin 1 dimensions: inches (mm) 0.0098 (0.249) 0.0040 (0.102) 16-lead sop (m) 0.022 (0.559) 0.018 (0.457) 5 typ 0.408 (10.363) 0.404 (10.262) 0.409 (10.389) 0.405 (10.287) 0.103 (2.616) 0.099 (2.515) seating plane 0.027 (0.686) 0.031 (0.787) 0.016 (0.046) typ 0.301 (7.645) 0.297 (7.544) 0.094 (2.388) 0.090 (2.286) 0.297 (7.544) 0.293 (7.442) 10 typ 0.032 (0.813) typ 0.330 (8.382) 0.326 (8.280) 7 typ 0.050 (1.270) typ 0.015 (0.381) r 0.015 (0.381) min pin 1 dimensions: inches (mm) 16-lead wide sop (wm)
mic2027/2077 micrel mic2027/2077 16 june 2000 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. ? 2000 micrel incorporated

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