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mp5003 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 1 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the mp5003 is a protection device designed to protect circuitry on the output (v out ) from transients on the input (v in ). it also protects v in from undesired shorts and transients coming from the load. at start up, inrush current is limited by limiting the slew rate at v out . the slew rate is controlled by a small capacitor at the dv/dt pin. the dv/dt pin has an internal circuit that allows the customer to float this pin (no connect) and still receive a 1.1ms ramp time at v out . the max load at the output (v out ) is current limited. this is accomplished by utilizing a sense fet topology. the magnitude of the current limit is controlled by an external resistor connected between the i limit pins. an internal charge pump drives the gate of the power device, allowing a very low on-resistance dmos power fet of just 44m ? . v out is protected from v in being too low or too high. under voltage lockout (uvlo) assures that the input is above the minimum operating threshold, before the power device is turned on. if v in goes above the high output threshold, the output voltage will be limited. features ? integrated 44m ? power fet ? enable/fault pin ? adjustable slew rate for output voltage ? adjustable current limit: 1a-3a ? automatically startup after thermal protection ? over voltage limit applications ? hot swap ? pc cards ? cell phones ? laptops typical application mp5003 +ilimit -ilimit enable/fault vout vout vout vout vout vin dv/dt gnd 5 11 6 7 8 9 10 4 3 2 1 vin vout c dv/dt (optional) r limit en ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 2 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) MP5003EQ qfn10 (3x3) 7m -20 ? c to +85 ? c * for tape & reel, add suffix ?z (e.g. MP5003EQ?z); for rohs compliant packaging, add suffix ?lf (e.g. MP5003EQ?lf?z) package reference top view gnd dv/dt enable/fault -ilimit +ilimit 1 2 3 4 5 vout vout vout vout vout 10 9 8 7 6 exposed vin pad absolute maxi mum ratings (1) v in , v out , + i limit , -i limit .................................. 22v dv/dt, enable/fault .................................. 6v continuous power dissipation (t a =+25 o c) (2) ............................................................. 2.5w storage temperature ............... -65c to +155 ? c junction temperature?..??..-20 ? c to +150 ? c recommended operating conditions input voltage operating range???.2.5v to 6v operating junct.temp(t j )??..-20 ? c to +125 ? c thermal resistance (3) ja jc qfn10 .................................... 50 ...... 12 ... ? 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-to- ambient thermal resistance ? ja and the ambient temperature t a, the maximum allowable power dissipation at any ambient temperature is calculated using: 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 circuitry protects the device from permanent damage. reduce 0.2 watts for every 10 o c ambient temperature increasing 3) measured on jesd51-7 4-layer board.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 3 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characteristics v in = 3.3v, r limit =24 ? , c out = 10 f, t j =25 ? c, unless otherwise noted. parameters symbol condition min typ max units power fet delay time t dly enabling of chip to i d =100ma with a 12 ? resistive load 0.2 ms on resistance r dson t j =+25c 44 82 m ? t j =+80c, note 4 95 off state output voltage v off enable=0v,r l =500 ? 120 mv thermal latch shutdown temperature t sd note 4 175 c under/over voltage protection output clamping voltage v clamp overvoltage protection v in = 6v 3.63 4.03 4.43 v under voltage lockout v uvlo turn on, voltage going high 2.15 2.35 2.5 v under voltage lockout (uvlo) hysteresis v hyst 100 400 mv current limit short circuit current limit (hold current) i lim r limit =24 ? , note 4 1.2 1.55 1.9 a trip current i lim-ol r limit =24 ? , note 4 2.0 2.5 3.0 a dv/dt circuit rise time t r float dv/dt pin, note 5 0.64 1.1 2.0 ms enable/fault low level input voltage v il output disabled 0.5 v high level input voltage v ih output enabled 2.5 v high state maximum voltage v i ( max ) 3.25 v low level input current (sink) i il v enable =0v -55 -75 a maximum fanout for fault signal total number of chips that can be connected for simultaneous shutdown 5 units maximum voltage on enable pin v max note 6 v in v total device bias current i bias device operational 1.5 2.0 ma thermal shutdown 0.9 minimum operating voltage for uvlo v min enable<0.5v 2.0 v notes: 4) guaranteed by design. 5) measured from 10% to 90%. 6) maximum input voltage to be 6v if v in 6v. maximum input voltage to be v in if v in 6v.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 4 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pin functions pin # name description 1-5 vout this pin is the v out of the internal power fet and the output terminal of the ic. 6 +ilimit a resistor between these pins sets t he overload and short circuit current limit levels. 7 -ilimit a resistor between these pins sets t he overload and short circuit current limit levels. 8 enable/fault the enable/fault pin is a bi-directional interface. it can be used to enable the output of the device by floating the pin, or disable the chip by pulling it to ground (using an open drain or open collector device). if a thermal fault occurs, the voltage on this pin will drive to ground, automatically. 9 dv/dt the internal dv/dt circuit controls the slew rate of the output voltage at turn on. it has an internal capacitor that allows it to ramp up over the period of 1.1ms. an external capacitor can be added to this pin to increase the ramp time. if an additional time delay is not required, this pin should be left open. 10 gnd negative input voltage to the device. this is used as the internal reference for the ic. 11 vin positive input voltage to the device (exposed pad).
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 5 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics v in =3.3v, v en =3.3v, r limit =24 ? , c out =10 f, cdv/dt=1nf, t a =25c, unless otherwise noted. 1.2 1.3 1.4 1.5 1.6 1.7 1.8 2.5 3 3.5 4 input volt ag e (v) load current(a) input to output voltage(mv) supply current(ma) supply current,output enabled vs.input voltage no load, en floating supply current,output disabled vs.input voltage v en =0v 0.75 0.8 0.85 0.9 0.95 2.5 3 3.5 4 input voltage(v) supply current(ma) static drain-source on-state resistance vs. input voltage i out =1a input voltage(v) input voltage(v) 0 20 40 60 80 100 120 140 0 0 .5 1 1 .5 2 2 .5 2.3 2.4 2.5 2.6 2.7 2.8 2.5 3 3.5 4 trip current(a) 1.4 1.5 1.6 1.7 1.8 2.5 3 3.5 4 h o ld cu r r en t(a) current limit response vs. peak current no cout 4 10 16 22 28 3 8 13 18 peak current(a) response time(us) trip and hold current vs. rlimit 0 1 2 3 4 5 6 0 20 40 60 80 100 120 trip current & hold current(a) trip current hold current v in =3v v in =3.3v v in =3.6v v in =3.9v 40 45 50 55 60 65 70 2.5 3 3.5 4 input voltage (v)
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 6 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics (continued) v in =3.3v, v en =3.3v, r limit =24 ? , c out =10 f, cdv/dt=1nf, t a =25c, unless otherwise noted. v out 2v/div i out 1a/div 2ms/div inrush current with different load capacitance no cdv/dt trip current with ramped load on enabled device no cdv/dt en 2v/div i out 500ma/div 1ms/div turn on delay and rise time cdv/dt=1nf c out =10uf,no load v out 2v/div en 2v/div 10ms/div turn on delay and rise time no cdv/dt c out =10uf,no load v out 2v/div en 2v/div 1ms/div turn off delay and fall time no cdv/dt c out =10uf,no load v out 2v/div en 2v/div 10ms/div v out 2v/div en 2v/div 1ms/div 10ms/div short circuit current, device enabled into short no cdv/dt en 2v/div i out 1a/div 100us/div i out 1a/div 400ms/div short circuit current, device enabled into short, thermal shut down, and auto start up en floating , no cdv/dt en 2v/div i out 1a/div v out 2v/div en 2v/div i out 1a/div 2200uf 1000uf 470uf
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 7 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics (continued) v in =3.3v, v en =3.3v, r limit =24 ? , c out =10 f, cdv/dt=1nf, t a =25c, unless otherwise noted. 20us/div 20us/div current limit (trip hold thermal shut down auto start up) no cdv/dt v out 2v/div i out 1a/div v out 2v/div i out 2a/div v out 2v/div i out 2a/div 200ms/div peak current peak current response time response time
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 8 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. block diagram vout vin enable/ fault enable thermal shutdown uvlo voltage clamp dv/dt control current limit charge pump -ilimit gnd dv/dt +ilimit figure 1?function block diagram
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 9 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. current limit the desired current limit is a function of the external current limit resistor. table 1?current limit vs. current limit resistor (v in =3.3v) current limit resistor ( ? ) 13 24 50 100 trip current (a) 4 2.5 1.7 1.37 hold current (a) 3.2 1.55 0.77 0.37 when the part is active, if load reaches trip current (minimum threshold current triggering overcurrent protection) or a short is present, the part switches into to a constant-current (hold current) mode. part will enter thermal cycling only if the overcurrent condition stays long enough to trigger thermal protection. however, when the part is powered up by v cc or en, the load current should be smaller than hold current. otherwise, the part can?t be fully turned on. in a typical application using a current limit resistor of 24 ? , the trip current will be 2.5a and the hold current will be 1.55a. if the device is in its normal operating state and passing 1.5a it will need to dissipate only 99mw with the very low on resistance of 44m ? . for the package dissipation of 50c/watt, the temperature rise will only be + 5c. combined with a 25c ambient, this is only 30c total package temperature. during a short circuit condition, the device now has 3.3v across it and the hold current clamps at 1.55a and therefore must dissipate 5w. at 50c/watt, if uncontrolled, the temperature would rise above the thermal protection threshold (+175c) and the device will shutdown to cause the temperature to drop. proper heat sink must be used if the device is intended to supply the hold current and not shutdown. without a heat sink, hold current should be maintained below 909ma at + 25c and below 545ma at +85c to prevent the device from activating the thermal shutdown feature. rise time the rise time is a function of the capacitor (cdv/dt) on the dv/dt pin. table 2?rise time vs. cdv/dt cdv/dt none 50pf 500pf 1nf rise time (typical) (ms) 1.1 2.2 12.3 23.5 * notes: rise time = k rt *(50pf+c dv/dt ), k rt =22e6 the ?rise time? is measured by from 10% to 90% of output voltage. u 90% 10% rise time t input output enable figure 2?rise time fault and enable pin the enable/fault pin is a bi-directional i/o with a weak pull up current (25ua typical). it functions to enable/disable the part. enable pin as an input: 1. low disables the part. 2. high enables the part. enable pin as an output: 1. the pull up current may (if not over ridden) allow a ?wired nor? pull up to enable the part. 2. an under voltage will cause a low on the enable pin. 3. a thermal fault will cause a low level on the enable pin.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 10 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. there are 4 types of faults, and each fault has a direct and indirect effect on the enable/fault pin and the internal fault flag. in a typical application where there are multiple mp5003 chips in a system, the enable/fault lines are typically connected together. under voltage lock out operation if the supply (input) is below the uvlo threshold, the output is disabled, and the fault line is driven low. when the supply goes above the uvlo threshold, the output is enabled and the enable/fault pin is released. when the enable/fault pin is released it will be pulled high by a 25ua current source. no external pull up resistor is required. in addition, the pull up voltage is limited to 5 volts. table 3?fault function influence in application fault description internal action effect on fault pin effect on flag effect on secondary part short/over current limit current none none none under voltage output is turned off internally drives enable/fault pin to logic low flag is reset secondary part output is disabled, and fault flag is reset. over voltage limit output voltage none none none thermal shutdown shutdown part. the part retries to start up automatically internally drives enable/fault pin to low level, and after part cools down, enable/fault pin will be pulled high flag is set at thermal shut down, and is set to high after auto start up. secondary part output is disabled when thermal shut down, and is enabled after mp5003 auto start up.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 11 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. thermal protection the mp5003 only considers a thermal overload to be a fault. under a fault condition the mp5003 will have two actions: 1) turn off the output power device. 2) drive the enable/fault pin to the low level. the power device will remain off until the die temperature drops below the hysteresis level. when the die cools down below the thermal hysteresis level, the mp5003 will restart in the start up mode and the fault line will be pulled high through a 25ua pull up current. if the cause of the fault has been removed, the output will ramp up in a controlled fashion with the ramp rate controlled by the dv/dt function. if the cause of the fault is still present, the excess power dissipation will heat up the part. when the die temperature reaches the thermal shutdown temperature, the output will be turned off and the enable/fault pin will be driven to the low level. this cycle will repeat until the cause of the fault is removed. output voltage uvlo threshold input voltage output short (cause of fault) die temperature thermal shutdown temp thermal hysteresis fault/enable pin output current normal operating current current limit t0 t1 t4 t2 t3 t5 t6 t7 figure 3 D thermal protection in short condition the drawing above shows the initial start up sequence and the occurrence of a short at the output. at time t0 the input voltage begins to rise. at t1 the input voltage rises above the uvlo threshold and the part starts up. the output current ramps up and settles in at the normal operating current level until time t2. there is a very small temperature heating of the die in normal operation. at time t2 the output is shorted. this brings the output very close to ground. the output current increases to the current limit level and is held there by the mp5003. because of the large current and the large voltage across the power device, the die will begin to heat up. at time t3 the die temperature is at the thermal shutdown level and the part will turn the power device off. the enable/fault pin is driven to the low level. once the power device is off, the die temperature will begin to drop.
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable mp5003 rev. 0.921 www.monolithicpower.com 12 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. at time t4 the part has cooled down below the thermal hysteresis level. the enable pin goes high and the part turns on again. but the short is still present, causing the die temperature to increase. at time t5 the power device turns off and the enable/fault pin is driven to the low level, again. the temperature begins to fall. the cycle between times t3, t4 and t5 could repeat indefinitely, but at time t6 the short is removed. at time t7 the die temperature is below the thermal hysteresis level and the part turns on once again. this time there is no short, so the output starts in normal operation and the die temperature cools down to the normal operating range. pcb layout pcb layout is very important to achieve stable operation. please follow these guidelines and take below figure for reference. place rlimit close to ilimit pin, cdv/dt close to dv/dt pin and input cap close to vin (exposed pad). keep the n/c pin float. put vias in thermal pad and ensure enough copper area near vin and vout to achieve better thermal performance. c2 c4 r limit cdv/dt top layer bottom layer figure 4?pcb layout
mp5003 ? 3.3v, 1a-3a programmable current limit switch with auto enable 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. \mp5003 rev. 0.921 www.monolithicpower.com 13 2/29/2012 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information qfn10 (3mm x 3mm) side view top view 1 10 6 5 bottom view 2.90 3.10 1.45 1.75 2.90 3.10 2.25 2.55 0.50 bsc 0.18 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 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) drawing conforms to jedec mo-229, variation veed-5. 5) drawing is not to scale. pin 1 id see detail a 2.50 0.70 pin 1 id option b r0.20 typ. pin 1 id option a r0.20 typ. detail a 0.30 0.50 pin 1 id index area

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