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ap2161/ap2171 1.0a single channel current-limited power switch ap2161/ap2171 rev. 1 1 of 15 september 2008 www.diodes.com ? diodes incorporated features description the ap2161 and ap2171 are integrated high-side power switches optimized for universal serial bus (usb) and other hot-swap applications. the family of devices complies with usb 2.0 and available with both polarities of enable input. they offer current and thermal limiting and short circuit protection as well as controlled rise time and under-voltage lockout functionality. a 7ms deglitch capability on the open-drain flag output prevents false over-current reporting and does not require any external components. ? single usb port power switches ? over-current and thermal protection ? 1.5a accurate current limiting ? reverse current blocking ? 120m on-resistance ? input voltage range: 2.7v ? 5.5v ? 0.6ms typical rise time ? very low shutdown current: 1ua (max) ? fault report (flg) with blanking time (7ms typ) ? esd protection: 4kv hbm, 400v mm ? active low (ap2161) or active high (ap2171) enable all devices are available in sop-8l, msop-8l-ep and sot25 packages ? ambient temperature range -40oc to 85c ? sot25, sop-8l and msop -8l-ep (exposed pad): available in ?green? molding compound (no br, sb) ? lead free finish / rohs compliant (note 1) ? ul pending, file e322375 applications ? consumer electronics ? lcd tv & monitor, game machines ? communications ? set-top-box, gps, smartphone ? computing ? laptop, desktop, servers, printers, docking station, hub ordering information ap 21 x 1 xx g - x 6 : active low 7 : active high g : green u : tube 7/13 : tape & reel 1 : 1 channel channel lead free package enable packing w : sot25 s : sop-8l mp : msop-8l-ep tube 7?/13? tape and reel device package code packaging (note 2) quantity part number suffix quantity part number suffix ap21x1wg-7 w sot25 na na 3000/tape & reel -7 ap21x1sg-u s sop-8l 100 -u na na ap21x1sg-13 s sop-8l na na 2500/tape & reel -13 ap21x1mpg-u mp msop-8l-ep 80 -u na na ap21x1mpg-13 mp msop-8l-ep na na 2500/tape & reel -13 notes: 1. eu directiv e 2002/95/ec (rohs). all applicable rohs exemptions applied, see eu directive 2002/95/ec annex notes . 2. pad layout as shown on diodes inc. suggested pad layout document ap02001, which can be found on our website at http://www.diodes.c om/datas heets/ap02001.pdf .
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 2 of 15 september 2008 www.diodes.com ? diodes incorporated pin assignment sop-8l ( top view ) 1 2 3 4 8 7 6 5 nc out flg out gnd en in in msop-8l-ep 1 2 3 4 8 7 6 5 nc out flg out gnd en in in ( top view ) en out gnd in flg 1 2 3 5 4 sot25 ( top view ) pin descriptions pin number sop-8l pin name msop-8l-ep sot25 descriptions gnd 1 2 ground in 2, 3 5 voltage input pin (all in pins must be tied together externally) en 4 4 enable input, active low (ap2161) or active high (ap2171) flg 5 3 over-current and over-temperature fault report; open-drain flag is active low when triggered out 6, 7 1 voltage output pin (all out pins must be tied together externally) nc 8 n/a no internal connection; recommend tie to out pins
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 3 of 15 september 2008 www.diodes.com ? diodes incorporated functional block diagram ap2161, ap2171 thermal sense driver flg out gnd in en uvlo current limit current sense deglitch typical application circuit 0.1uf in gnd en out on 120uf power supply 2.7v to 5.5v 0.1uf off flg load 10k 10uf ap2171 enable active high available options part number channel enable pin (en) current limit (typical) recommended maximum continuous load current ap2161 1 active low 1.5a 1.0a ap2171 1 active high 1.5a 1.0a
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 4 of 15 september 2008 www.diodes.com ? diodes incorporated absolute maximum ratings symbol parameter ratings units esd hbm human body model esd protection 4 kv esd mm machine model esd protection 400 v v in input voltage 6.5 v v out output voltage v in + 0.3 v v en , v flg enable voltage 6.5 v i load maximum continuous load current internal limited a t jmax maximum junction temperature 150 c t st storage temperature range -65 ~ 150 c recommended operating conditions symbol parameter min max units v in input voltage 2.7 5.5 v i out output current 0 1.0 a t a operating ambient temperature -40 85 c
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 5 of 15 september 2008 www.diodes.com ? diodes incorporated electrical characteristics (t a = 25 o c, v in = +5.0v, unless otherwise stated) symbol parameter test conditions min typ. max unit v uvlo input uvlo r load =1k 1.6 1.9 2.5 v i shdn input shutdown current disabled, i out = 0 0.5 1 a i q input quiescent current enabled, i out = 0 45 70 a i leak input leakage current disabled, out grounded 1 a i rev reverse leakage current disabled, v in = 0v, v out = 5v, i rev at v in 1 a msop-8l-ep and sot25 115 150 m ? v in = 5v, i out = 0.5a, -40 o c t a 85 o c sop-8l only 120 160 m ? r ds(on) switch on-resistance v in = 3.3v, i out = 0.5a, -40 o c t a 85 o c 140 180 m ? i short short-circuit current limit enabled into short circuit, c l =68 f 1.2 a i limit over-load current limit v in = 5v, v out = 4.6v, c l =68 f, - 4 0 o c t a 85 o c 1.1 1.5 1.9 a i trig current limiting trigger threshold output current slew rate (<100a/s) , c l =68 f 2.0 a v il en input logic low voltage v in = 2.7v to 5.5v 0.8 v v ih en input logic high voltage v in = 2.7v to 5.5v 2 v i sink en input leakage v en = 5v 1 a t d(on) output turn-on delay time c l =1 f, r load =10 0.05 ms t r output turn-on rise time c l =1 f, r load =10 0.6 1.5 ms t d(off) output turn-off delay time c l =1 f, r load =10 0.01 ms t f output turn-off fall time c l =1 f, r load =10 0.05 0.1 ms r flg flg output fet on-resistance i flg =10ma 30 50 ? t blank flg blanking time c in =10uf, c l =68 f 4 7 ms t shdn thermal shutdown threshold enabled, r load =1k 140 c t hys thermal shutdown hysteresis 25 c sop-8l (note 3) 110 o c/w msop-8l-ep (note 4) 60 o c/w ja thermal resistance junction-to-ambient sot25 (note 5) 157 o c/w notes: 3. test condition for sop-8l: device mount ed on fr-4, 2oz copper, with minimum recommended pad layout. 4. test condition for msop-8l-ep: device mounted on 2? x 2? fr-4 substrate pc board, 2oz copper, with minimum recomme nded pad on top layer and thermal vias to bottom layer ground plane. 5. test condition for sot25: device mounted on fr-4, 2oz copper, with minimum recommended pad layout.
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 6 of 15 september 2008 www.diodes.com ? diodes incorporated typical performance characteristics v en 90% v out t d(on) 10% t d(off) 50% 50% t r 10% 90% t f v en 90% v out t d(on) 10% t d(off) 50% 50% t r 10% 90% t f figure 1. voltage waveforms: ap2161 (left), ap2171 (right) all enable plots are for ap2171 active high turn-on delay and rise time 500us/div turn-off delay and fall time 500us/div turn-on delay and rise time 500us/div turn-off delay and fall time 500us/div ve n 5v/div ve n 5v/div c l =1uf t a =25c r l =10 ? vout 2v/div vout 2v/div c l =1uf t a =25c r l =10 ? ve n 5v/div ve n 5v/div c l =100uf t a =25c r l =10 ? vout 2v/div vout 2v/div c l =100uf t a =25c r l =10 ?
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 7 of 15 september 2008 www.diodes.com ? diodes incorporated typical performance characteristics (continued) short circuit current, device enabled into short 500us/div inrush current 1ms/div 1 ? load connected to enabled device 2ms/div 2 ? load connected to enabled device 2ms/div short circuit with blanking time and recovery 20ms/div power on 1ms/div ve n 5v/div ve n 5v/div v in =5v t a =25c r l =10 ? c l =100uf v in =5v t a =25c c l =68uf c l =470uf iout 500ma/div iout 500ma/div c l =220uf v in =5v t a =25c c l =68uf v in =5v t a =25c c l =68uf vflag 2v/div vflag 2v/div iout 1a/div iout 1a/div v in =5v t a =25c c l =68uf vflag 5v/div vout 5v/div t a =25c c l =68uf r l =10 ? iout 500ma/div vflag 5v/div ve n 5v/div iout 1a/div vin 5v/div
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 8 of 15 september 2008 www.diodes.com ? diodes incorporated typical performance characteristics (continued) uvlo increasing 1ms/div uvlo decreasing 10ms/div turn-on time vs input voltage 250 300 350 400 450 500 550 600 650 700 750 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) turn-on time (us) turn-off time vs input voltage 25 26 26 27 27 28 28 29 29 30 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) turn-off time (us) rise time vs input voltage 250 300 350 400 450 500 550 600 650 22.533.544.555.56 input voltage (v) rise time (us) fall time vs input voltage 19 20 20 21 21 22 22 22.533.544.555.56 input voltage (v) fall time (us) t a =25c c l =68uf r l =10 ? vin 2v/div vin 2v/div iout 500ma/div t a =25c c l =68uf r l =10 ? iout 500ma/div c l =1uf r l =10 ? t a =25c c l =1uf r l =10 ? t a =25c c l =1uf r l =10 ? t a =25c c l =1uf r l =10 ? t a =25c
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 9 of 15 september 2008 www.diodes.com ? diodes incorporated typical performance characteristics (continued) supply current, output enabled vs ambient temperature 28 33 38 43 48 53 58 63 68 -60 -40 -20 0 20 40 60 80 100 ambient temperature (c) supply current, output enabled (ua) supply current, output disabled vs ambient temperature 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 -60 -40 -20 0 20 40 60 80 100 ambient temperature (c) supply current, output disabled (ua) static drain-source on-state resistance vs ambient temperature 80 90 100 110 120 130 140 150 160 170 -60 -40 -20 0 20 40 60 80 100 ambient temperature (c) static drain-source on-state resistance (m ? ) short-circuit output current vs ambient temperature 1.45 1.46 1.47 1.48 1.49 1.50 1.51 1.52 1.53 1.54 1.55 1.56 -60 -40 -20 0 20 40 60 80 100 ambient temperature (c) short-circuit output current (a) undervoltage lockout vs ambient temperature 1.60 1.70 1.80 1.90 2.00 2.10 2.20 -60 -40 -20 0 20 40 60 80 100 ambient temperature (c) undervoltage lockout (v) threshold trip current vs input voltage 1.88 1.89 1.90 1.91 1.92 1.93 1.94 1.95 1.96 1.97 1.98 1.99 2.8 3.3 3.8 4.3 4.8 5.3 input voltage (v) threshold trip current (a) vin=5.5v vin=5.0v vin=5.0v vin=3.3v vin=5.5v vin=2.7v vin=3.3v vin=2.7v vin=2.7v c l =100uf vin=3.3v vin=2.7v vin=5.0v vin=3.3v vin=5.5v vin=5v uvlo rising t a =25c c l =68uf uvlo falling
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 10 of 15 september 2008 www.diodes.com ? diodes incorporated typical performance characteristics (continued) current limit response vs peak current 0 20 40 60 80 100 120 024681 0 peak current (a) current limit response (us) 1 2 v in =5v t a =25c c l =68uf
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 11 of 15 september 2008 www.diodes.com ? diodes incorporated application note power supply considerations a 0.01- f to 0.1- f x7r or x5r ceramic bypass capacitor betw een in and gnd, close to the device, is recommended. placing a high-value electrolytic capa citor on the input and output pin(s) is recommended when the output load is heavy. this precaution reduces power-supply transients that may cause ringing on the input. additionally, bypassing the output with a 0.01- f to 0.1- f ceramic capacitor improves the immunity of the device to short-circuit transients. over-current and short circuit protection an internal sensing fet is employed to check for over -current conditions. unlike current-sense resistors, sense fets do not increase the series resistance of the current path. when an over-current condition is detected, the device maintains a constant output current and reduces the output voltage accordingly. complete shutdown occurs only if the fault stays long enough to activate thermal limiting. three possible overload conditions can occur. in th e first condition, the output has been shorted to gnd before the device is enabled or before v in has been applied. the ap2161/ap2171 senses the short circuit and immediately clamps output current to a certain safe level namely i limit . in the second condition, an output short or an overload occurs while the device is enabled. at the instance the overload occurs, higher current may flow for a very short period of time before the current limit function can react. after the current limit function has tripped (reached the over-current trip threshold), the device switches into current limiting mode and the current is clamped at i limit . in the third condition, the load has been gradually increased beyond the recommended operating current. the current is permitted to rise un til the current-limit threshold (i trig ) is reached or until the thermal limit of the device is exceeded. the ap2161/ap2171 is capable of delivering current up to the current-limit threshold without damaging the device. once the threshold has been reached, the device switches into its current limiting mode and is set at i limit . flg response when an over-current or over-temperature shutdo wn condition is encountered, the flg open-drain output goes active low after a nominal 7-ms deglitch timeou t. the flg output remains low until both over-current and over-temperature conditions are removed. connecting a heavy capacitive load to the output of the device can cause a momentar y over-current condition, which does not trigger the flg due to the 7-ms deglitch timeout. the ap2161/ap2171 is designed to elimi nate false over-current r eporting without the need of external components to remove unwanted pulses. power dissipation and junction temperature the low on-resistance of the internal mosfet allo ws the small surface-mount packages to pass large current. using the maximum operating ambient temperature (t a ) and r ds(on) , the power dissipation can be calculated by: p d = r ds(on) i 2 finally, calculate the junction temperature: t j = p d x r ja + t a where: t a = ambient temperature c r ja = thermal resistance p d = total power dissipation
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 12 of 15 september 2008 www.diodes.com ? diodes incorporated application note (continued) thermal protection thermal protection prevents the ic from damage when hea vy-overload or short-circuit faults are present for extended periods of time. the ap2161/ap2171 implement s a thermal sensing to monitor the operating junction temperature of the power distribution switch . once the die temperature rises to approximately 145c due to excessive power dissipation in an over-current or short-circuit c ondition, the internal thermal sense circuitry turns the power switch off, thus preventing the power switch from damage. hyst eresis is built into the thermal sense circuit allowing the device to cool down approximately 25c before the switch turns back on. the switch continues to cycle in this manner un til the load fault or input power is removed. the flg open-drain output is asserted when an over-temperature shutdown or over-cu rrent occurs with 7-ms deglitch. under-voltage lockout (uvlo) under-voltage lockout function (uvlo) keeps the internal power switch from being turned on until the power supply has reached at least 1.9v, even if the switch is enabled. whenev er the input voltage falls below approximately 1.9v, the power switch is quickly turned off. this fa cilitates the design of hot-insertion systems where it is not possible to turn off the pow er switch before input power is removed. host/self-powered and bus-powered hubs hosts and self-powered hubs have a local power su pply that powers the embedded functions and the downstream ports (see figure 2). this power supply must provide from 5.25v to 4. 75v to the board side of the downstream connection under full-load and no-load conditions. hosts and sphs are required to have current-limit protection and must re port over-current conditions to t he usb controller. typical sphs are desktop pcs, monitors, printers, and stand-alone hubs. figure 2. typical one-port usb host / self-powered hub generic hot-plug applications in many applications it may be necessary to remove modules or pc boards while the main unit is still operating. these are considered hot-plug applications. su ch implementations require the control of current surges seen by the main power supply and the card bei ng inserted. the most effective way to control these surges is to limit and slowly ramp the current and vo ltage being applied to the card, similar to the way in which a power supply normally turns on. due to the controlled rise times and fall times of the ap2161/ap2171, these devices can be used to provide a softer start-up to devices being hot-plugged into a powered system. the uvlo feature of the ap2161/ap2171 also ensures that the switch is off after the card has been removed, and that the switch is off during the next insertion. by placing the ap2161/ap2171 between the v cc input and the rest of the circuitry, the input power reaches these devices first after insertion. the typical rise time of the switch is approximately 1ms, providing a slow voltage ramp at the output of the device. this implem entation controls system su rge current and provides a hot-plugging mechanism for any device.
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 13 of 15 september 2008 www.diodes.com ? diodes incorporated marking information (1) sop-8l ap21x x (top view) yy xx part number logo xth week : 01~52 year : "07" = 2007 "08" = 2008 x g : green x internal code 8765 1 2 34 ~ 6 : active low 7 : active high 1 : 1 channel (2) msop-8l-ep ap21x x ( top view ) y m x part number logo month : a~l=01~12 year : "7" = 2007 "8" = 2008 a~z : green 87 65 1 234 ~ 6 : active low 7 : active high 1 : 1 channel (3) sot25 1 2 3 5 7 4 xx y m x xx : identification code m : month a~l x : a~z : green (top view) y : year 0~9 device package type identification code ap2161w sot25 ht ap2171w sot25 hu
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 14 of 15 september 2008 www.diodes.com ? diodes incorporated package information (all dimensions in mm) (1) package type: sop-8l 1.27typ 0.3/0.5 7~9 4.80/5.30 3.70/4.10 5.79/6.20 0.20typ 7~9 3.70/4.10 0.38/1.27 0.08/0.25 gauge plane 0.254 seating plane 0.35max. 45 detail "a" detail "a" 1.30/1.50 1.75max. land pattern recommendation 0.78 (unit: mm) 6x-1.27 8x-1.55 8x-0.60 5.4 (2) package type: msop-8l-ep 2.9/3.0 0.75/0.95 0/0.15 2.9/3.0 4.8/5.0 0.65bsc. 0.3 0.05 0.15typ. 0.4/0.8 0.25 0.95ref. gauge plane 0 / 8 "a" detail "a" 1.35/1.65 1.65/1.95 exposed pad (bottom) 4.2 8x-0.32 8x-0.8 6x-0.65 exposed pad (bottom) 1 1 1 land pattem recommendation (unit:mm)
ap2161/ap2171 1a single channel current-limited power switch a ap2161/ap2171 rev. 1 15 of 15 september 2008 www.diodes.com ? diodes incorporated package information (continued) (3) package type: sot25 important notice life support diodes incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or ot her changes without further notice to any product herein. diodes incorporated does not assume any liability arising out of the application or use of any pr oduct described herein; neither does it convey any license under its patent rights, nor the rights of others. the user of products in such applications shall a ssume all risks of such use and will agree to hold diodes incorporated and all the companies whose products are represented on our website, harmless against all dam ages. diodes incorporated products are not authorized for use as critical components in life support devices or systems without the e xpressed written approval of the president of diodes incorporated.

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