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MP62550/mp62551 precision 60ma-1.7a programmable current-limited power distribution switch MP62550/mp62551 rev. 1.21 www.monolithicpower.com 1 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description MP62550/mp62551 power distribution switch is designed for precision current limiting and provides up to 1.5a continuous output current. it offers programmable current limit between 60ma and 1.7a (typ) with 10% accuracy by an external resistor. the switch includes an 88m ? n-channel power mosfet and operates from 2.5v to 5.5v input voltage. the device has built-in protection for both over current and increased thermal stress. for over current, the device will limit the current by changing to a constant current mode. it will shutdown when its internal temperature reaches unsafe levels and recover once the device temperature reduces approx 10 c. it provides built-in soft-start which controls the rise and fall times of the output voltage to limit the initial inrush current and voltage surges. the reverse-voltage protection feature turns off the mosfet to protect the device. the flag ________ output will report a fail mode (low level) when over current or over temperature is encountered. the flag ________ will not change state when the input uvlo is triggered. the MP62550/mp62551 is available in space saving 6-pin tqfn 2x2mm package and tsot23-6 package. features ? up to 1.5a continuous output current ? 10% current-limit accuracy ? adjustable current-limit, 60ma -1700ma (typ) ? fast over-current response 2 s (typ) ? 2.5v to 5.5v supply range ? 88m ? mosfet (tqfn package) ? 1.5 a maximum standby supply current ? reverse input-output voltage protection ? built-in soft-start ? thermal-shutdown protection ? automatic-on after fault removed ? under-voltage lockout ? deglitched fault report ? flag ________ won't change state at input uvlo transition ? bidirectional fault deglitch time ? active low & active high options applications ? smart phone and pda ? portable gps device ? notebook pc ? set-top-box ? telecom and network systems ? pc card hot swap ? usb power distribution typical application gnd in ilim en out flag gnd vin en vout gnd mp62551 * * r flag 10k flag + r ilim pad (*en active low for MP62550) all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website unde r products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 2 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number* enable switch maximum continuous load current package top marking free air temperature (t a ) MP62550dgt active low tqfn6 (2x2mm) 5y mp62551dgt active high single 1.5a tqfn6 (2x2mm) aj -40 c to +85 c MP62550dj active low tsot23-6 5y mp62551dj active high single 1.5a tsot23-6 aan -40 c to +85 c * for tape & reel, add suffix ?z (e.g. mp62551dgt?z). for rohs compliant packaging, add suffix ?lf (e.g. mp62551dgt?lf?z) package reference absolute maxi mum ratings (1) in to gnd ....................................-0.3v to +6.5v ilim, en, flag ________ , out to gnd .....-0.3v to +6.5v r ilim range (1%)......................12.4k ? to 210k ? continuous power dissipation (t a = +25c) (2) tqfn(2x2)-6............................................ 1.56w tsot23-6 ................................................ 0.57w lead temperature ....................................260c storage temperature............... -65c to +150c maximum junction temp. (t j ) .............. +125c thermal resistance (3) ja jc tqfn6 (2x2mm)?. ................80 ...... 16 ... c/w tsot23-6?...........................220 .... 110 .. c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a function of the maximum junction temperature t j (max), the junction- toambient thermal resistance ja , and the ambient temperature t a . the maximum allowable continuous powe r dissipation at any ambient temperature is calculated by p d (max)=(t j (max)-t a )/ ja . exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circ uitry protects the device from permanent damage. 3) measured on jesd51-7, 4-layer pcb. out top view ilim flag in gnd en exposed pad on backside 1 2 34 5 6 in gnd en 1 2 3 6 5 4 out ilim flag top view tqfn6 (2x2mm) tsot23-6 MP62550/mp62551 single-channel (en active low for MP62550)
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 3 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics t a =+25c, 2.5v v in 5.5v, 12.4k ? r ilim 210k ? , r flag =10k ? , unless otherwise noted. parameters symbol test conditions min typ max units in voltage range v in 2.5 5.5 v tqfn2x2-6 88 135 fet on_resistance r ds(on) v in =5v, i out =100ma -40c t a +85c tsot23-6 100 135 m ? supply current i in_on device enabled, v out =float, v in =5.5v 125 145 a shutdown current i in_off device disabled, v out =float, v in =5.5v 1.5 a reverse leakage current i rev v in =0v, v out =5.5v 0.01 1 a r ilim =13k ? 1530 1700 1870 r ilim =20k ? 960 1190 1360 r ilim =49.9k ? 450 510 570 r ilim =210k ? 105 135 166 current limit (see figure 2) i os ilim shorted to in -40c t a 85c, out connected to gnd 45 60 85 ma short current response time t ios v in =5v (see figure 2) 2 s under-voltage lockout inuv vth v in rising edge 2.25 2.45 v under-voltage hysteresis inuv hys 130 mv en input logic high voltage vih en 1.1 v en input logic low voltage vil en 0.66 v en input leakage current i en v en =0-5.5v -0.5 0.5 a flag ________ output logic low voltage v ol i flag =1ma 180 mv flag ________ output high leakage current i flag_off v flag =5.5v 1 a flag ________ deglitch time t flag_deg delay time for assertion or de- assertion due to over-current condition 3.5 7.5 10 ms reverse-voltage comparator trip point (v out ? v in ) v r_trip 135 mv time from reverse- voltage to mosfet turn off t r_res v in =5v 5 ms
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 4 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics (4) ( continued ) t a =+25c, 2.5v v in 5.5v, 12.4k ? r ilim 210k ? , r flag =10k ? , unless otherwise noted. parameters symbol test conditions min typ max units thermal shutdown threshold t j 155 c thermal shutdown threshold in current- limit condition t j_cl 135 c thermal shutdown hysteresis t j_hys 10 c v in =5.5v 0.5 1.5 v out rising time t r (5) r load =100 ? , c load =1 f v in =2.5v 0.75 ms v in =5.5v 0.1 0.4 v out falling time t f (6) r load =100 ? , c load =1 f v in =2.5v 0.1 0.4 turn on time t on (7) 3 turn off time t off (8) r load =100 ? , c load =100 f 30 ms notes: 4) production test at +25c. specificat ions over the temperature range are guaranteed by design and characterization. 5) measured from 10% to 90% output signal. 6) measured from 90% to 10% output signal. 7) measured from 50% en signal to 90% output signal. 8) measured from 50% en signal to 10% output signal.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 5 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions tqfn6 (9) pin # tsot23 pin # name i/o description 1 6 out o switch output. the v out of the internal power fet and output terminal of the ic. 2 5 ilim o external resistor used to set current-limit, recommended 12.4k ? r ilim 210k ? . 3 4 flag ????? o fault status. logic low wh en over-current, over-tem perature. open drain. 4 3 en i enable input. active low: (MP62550), active high: (mp62551). 5 2 gnd ground. externally connected to pad. 6 1 in i input voltage. accepts 2.5v to 5.5v input. pad pad internally connected to gnd. used to heat-sink the part to the circuit board traces. connect pad to gnd pin externally. notes: 9) the part has thermal pad on the backside and the pad is gnd. parameter measurem ent information v i(en) v i(en) v o(out) v o(out) v o(out) out r l t on t on t off t off t f t r c l 50% 50% 50% 50% 90% 90% 90% 90% 10% 10% 10% 10% voltage waveforms test circuit figure 1?definition of t r , t f , t on , and t off figure 2?short circuit response time
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 6 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. block diagram in en* gnd out flag uvlo amp logic charge pump current sense thermal sense comp vref 8ms deglitch reverse voltage current limit ilim * en is active low for MP62550 figure 3?function block diagram
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 7 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in = 5v, r ilim = 20k ? , r flag =10k ? , c out =100 f , t a =+25c, unless otherwise noted. supply current, output disabled vs. input voltage v en =0 static drain-source on-state resistance vs. input voltage v en =3.3v, i out =1a, tsot package input to output voltage vs. load current v en =3.3v short circuit response time vs. peak current v en =3.3v supply current, output enabled vs. input voltage v en =3.3v 80 90 100 110 120 130 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) supply current (ua) -0.2 -0.1 0 0.1 0.2 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) supply current (ua) 60 80 100 120 140 160 180 200 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) 0 20 40 60 80 100 120 140 160 180 200 0 0.2 0.4 0.6 0.8 1 1.2 output current (a) input to output voltage (mv) v in =5.5v v in =5v v in =2.5v v in =3.3v v in =4.5v 0 0.5 1 1.5 2 2.5 3 2 2.5 3 3.5 4 4.5 5 5.5 6 input voltage (v) short current (a) 0 0.5 1 1.5 2 2.5 3 2345678910 peak current (a) static drain-source on-state resistance variation vs. ambient temperature v in =5v, i out =0.1a -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 -45 -30 -15 0 15 30 45 60 75 90
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 8 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, r ilim = 20k ? , r flag =10k ? , c out =100 f , t a =+25c, unless otherwise noted. v out 2v/div. v en 5v/div. i in 500ma/div. inrush current limit v out 2v/div. v en 5v/div. i in 500ma/div. v en 2v/div. i in 500ma/div. current limit device enabled v out 2v/div. v flag 5v/div. i out 1.00a/div. no load short inrush current current limit fault asserted after deglitch period v out 2v/div. v flag 5v/div. i in 1.00a/div. device turns off and re-enables into current-limit device begins thermal cycling output short circuit applied v out 2v/div. v flag 5v/div. i in 1.00a/div. fault de-asserted after deglitch period output short circuit removed v out 2v/div. v flag 5v/div. i in 1.00a/div. no load device enters current-limit device begins thermal cycling output short circuit applied v out 2v/div. v flag 5v/div. i in 1.00a/div. device thermal cycling when short-circuit presents fault de-asserted after deglitch period output short circuit removed v out 2v/div. v in 2v/div. i in 1.00a/div. reverse current until device turns off v out v in 5.5v applied to vout v in =5v device enabled device disabled fault asserted after deglitch period device thermal cycling when short-circuit presents fault asserted after deglitch period device shutdown due to reverse voltage
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 9 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, r ilim = 20k ? , r flag =10k ? , c out =100 f , t a =+25c, unless otherwise noted. v out 2v/div. v in 2v/div. i in 1.00a/div. device shutdown due to reverse voltage reverse-voltage recovery, power switch re-enables v in =5v 5.5v removed from vout v out =5.5v v out 2v/div. v flag 5v/div. i out 1.00a/div. ramp load fault asserted after deglitch period fault de-asserted after deglitch period no load inrush current limit device enabled ramp load removed ramp load applied v out 2v/div. v en 2v/div. i out 500ma/div. current limit
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 10 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. detailed description the MP62550/mp62551 is a precision current- limit power distribution switch which can provide up to 1.5a continuous output current. it allows the user to program the current-limit between 60ma and 1.7a (typ) with 10% accuracy via an external resistor connected between ilim and gnd pins. the switch includes an n-channel power mosfet and an internal charge pump to generate the gate driver voltage which is higher than input. the charge pump can work from input as low as 2.5v. the device has built-in protection for both over current and increased thermal stress. for over current, the device will limit the current by changing to a constant current mode. it will shutdown when its internal temperature reaches unsafe levels and recover once the device temperature reduces approx 10 c. it provides built-in soft-start which controls the rise and fall times of the output voltage to limit the initial inrush current and voltage surges. the reverse-voltage protection feature turns off the mosfet to protect the device. the flag ________ output will report a fail mode (low level) when over current or over temperature is encountered. the flag ________ will not change state when the input uvlo is triggered. over current MP62550/mp62551 switches into to a constant- current mode when responding to over-current conditions. it ramps the output current to current limit value i os and reduces the output voltage accordingly. MP62550/mp62551 will be thermal cycles only if the over current condition stays long enough to trigger thermal protection. trigger over current protection for different overload conditions occurring in applications: 1) the output has been shorted or overloaded before the device is enabled or input applied. MP62550/mp62551 detects the short or overload and switches into constant-current mode immediately. 2) a short or an overload occurs after the device is enabled. the device responds to the over- current condition within time t ios . the current- sense amplifier is overdriven, so high current may flow during this period of time and the internal current-limit mosfet is disabled momentarily before the current-limit circuit can react. then the current-sense amplifier recovers switches into constant-current mode. similar to the previous case, the MP62550/mp62551 will limit the current to i os until the overload condition is removed or the device entering thermal cycle. 3 output current has been gradually increased beyond the recommended operating current. the load current rises until the current-limit threshold is reached or until the thermal limit of the device is exceeded. the MP62550/mp62551 is capable of delivering current up to the current-limit without damaging the device. reverse-voltage protection to prevent damage the device on the input side of MP62550/mp62551, the n-channel mosfet will be turned off immediately whenever the output voltage exceeds the input voltage by 135mv (typ). there is an internal comparator which compares the voltage difference betweens drain and source of n-channel mosfet. the reverse voltage protection circuit only activates when r ds(on) x i reverse >135mv, that means there must be a temporary large reverse current from output to input that can trigger the reverse- voltage protection. after the comparator is triggered, the internal driver circuit starts to discharge the gate voltage via a constant current. it needs several milliseconds to fully turn off the n-channel mosfet. this protection could prevent significant current sinking into the input side. the MP62550/mp62551 exist the protection mode and enter to normal state once the reverse-voltage condition is removed. no need to recycle the input power or enable logic. there is no reverse current flow through the switch at the condition of 0v input and 5.5v output whatever the enable is high or low.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 11 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. flag response the flag ________ pin is an open drain configuration. when over current or over temperature is encountered, flag ________ will report a fail mode (low level). for over current, 7.5ms deglitch time-out is needed. this is used to ensure that no false fault signal is reported. this internal deglitch circuit eliminates the need for components. for over temperature, the flag ________ pin is not deglitched. the flag ________ will not change state when the input uvlo is triggered. under-voltage lockout (uvlo) this circuit is used to monitor the input voltage to ensure that the MP62550/mp62551 is operating correctly. this uvlo circuit also ensures that there is no operation until the input voltage reaches the minimum spec. built-in 130mv hysteresis prevents unwanted on/off power cycling due to input voltage drop from large current surges. enable the logic pin disables the chip to reduce the supply current. enable high activate the mp62551 while enable low activate the MP62550. the device will operate once the enable signal reaches the appropriate level. there is no hysteresis for enable pin. the input is compatible with both coms and ttl. thermal protection the purpose of thermal protection is to prevent damage in the ic by allowing exceptive current to flow and heat the junction. the die temperature is internally monitored by two independent thermal sensing circuits until the thermal limit is reached. the first thermal sensor turns off the power switch when the die temperature exceeds 135c (min) and the part is in current limit. the second thermal sensor turns off the power-switch when the die temperature exceeds 155c (min) regardless of whether the switch is in current limit. both two thermal sensors have built-in hysteresis. it will turn on the switch once it is cooled down 10c approximately . MP62550/mp62551 continues to cycle off and on until the fault is removed.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev. 1.21 www.monolithicpower.com 12 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information power-supply considerations over 10 f capacitor between in and gnd is recommended. this precaution reduces power- supply transients that may cause ringing on the input and improves the immunity of the device to short-circuit transients. in order to achieve smaller output load transient ripple, placing a high-value electrolytic capacitor on the output pin is recommended when the load is heavy. a 0.01 f to 0.1 f ceramic bypassing capacitor is recommended to improve the immunity of the device to transient conditions and noise. gnd in ilim en out flag gnd vin en vout gnd mp62551 * * r flag 10k flag + r ilim pad * en is active low for MP62550 figure 4?application circuit programming the current-limit the current-limit is programmed via an external resistor from ilim to gnd. the recommended 1% resistor range of r ilim is 12.4k ? r ilim 210k ? . the ilim pin can be connected to in to set the current-limit at its minimum level of 60ma (typ). it?s important to consider the tolerance of current limit when selecting a value for r ilim . some applications require that the minimum current limit is above a certain current level, while some applications require the maximum current limit is below a certain current level. figure 5 can be used to calculate the current limit value for a given ilim resistor and also can be used to select ilim resistor for a certain current limit. r ilim can be selected to provide a current limit that occurs 1) above a minimum load current or 2) below a maximum load current. to determine above a minimum current limit, find the maximum desired load current on the i os(min) curve and choose a value of r ilim below this value. the resulting maximum current limit is the intersection of the selected value of r ilim and the i os(max) curve. to determine below a maximum current limit, find the maximum desired load current on the i os(max) curve and choose a value of r ilim above this value. the resulting minimum current limit is the intersection of the selected value of r ilim and the i os(min) curve. in theory, the result of current limit multiplied by r ilim is a constant. but the internal amplifier has offset, as a result the current limit vs 1/r ilim is not linear at small programming resistor range. the theoretical current limit calculation formula is given as following: osnom 0.9248 ilim 18.818v i(a) rk = os min 0.9342 ilim 18.489v i(a) rk = os max 0.8944 ilim 18.229v i(a) rk = where: ilim 12.4k r 210k ?? . for better accuracy current limit setting, table1 and figure5 are highly recommended. those curve or data are provided basing on large amount experimental test results.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev.1.21 www.monolithicpower.com 13 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. figure 5?current-limit vs r ilim
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev.1.21 www.monolithicpower.com 14 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. table 1 shows the common r ilim vs. current limit data. 1% accuracy resistor is recommended for general applications. if a precision current limit is needed, it?s better to use more tightly tolerance resistors, e.g. 0.5% or 0.1%. resistor accuracy tolerance is not included in table 1. table 1?common r ilim resistor selections (10) current limit (a) 1% accuracy resistor (k ? ) ios 12.4 1.749 13 1.700 15 1.533 15.8 1.467 16.9 1.370 18.2 1.293 20 1.190 21.5 1.130 23.2 1.053 26.1 0.947 28.7 0.861 32.4 0.772 37.4 0.650 43.2 0.579 49.9 0.510 52.3 0.495 66.5 0.391 88.7 0.286 133 0.198 210 0.135 short ilim to in 0.060 notes: 10) above current limit vs. rilim data is typical value only and not guaranteed by production. refer to ec table for more accurate current limit setting. while the maximum recommended value of r ilim is 210k ? , there is one additional configuration that allows for a lower current limit. the ilim pin may be connected directly to in to provide a 60 ma (typ) current limit. auto-retry function figure 6 shows an auto-retry circuit implanted by an external resistor and capacitor. gnd in ilim en out flag input output c load r load power pad figure 6?auto-retry application v out 2v/div. v en 2v/div. i in 1a/div. figure 7?auto-retry waveform when over-current happens the flag ________ will report a low level, en is pulled down immediately and thus the part is shutdown. during the moment of en shutdown, the flag ________ changes to high impedance allowing c retry to begin charging. after a time delay determined by the rc constant, the en voltage reaches its turn-on threshold and re-enables the part. the part will continue to cycle in this manner until the fault condition is removed.
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches MP62550/mp62551 rev.1.21 www.monolithicpower.com 15 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information tqfn6 (2x2mm) side view top view 1 6 4 3 bottom view 1.90 2.10 0.90 1.10 1.90 2.10 1.50 1.70 0.65 bsc 0.25 0.35 0.70 0.80 0.00 0.05 0.20 ref pin 1 id marking 1.00 0.65 0.25 recommended land pattern 1.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size does not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) jedec reference is mo-229, variation vccc. 5) drawing is not to scale. pin 1 id chamfer 0.30x45o 1.60 0.60 0.20 0.30 pin 1 id index area
MP62550/mp62551 ?60ma-1.7a programmable curren t-limited power distribution switches notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP62550/mp62551 rev. 1.21 www.monolithicpower.com 16 6/27/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. tsot23-6

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