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mp5002 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 1 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp5002 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 ? thermal protection ? over voltage limit applications ? hot swap ? pc cards ? cell phones ? laptops typical application mp5002 +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.
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 2 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. ordering information part number* package top marking free air temperature (t a ) mp5002dq qfn10 (3x3) 3h ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. mp5002dq?z); for rohs compliant packaging, add suffix ?lf; (eg. 5002dq?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 .............................................. 22v dv/dt, enable/fault .................................. 6v continuous power dissipation (t a = +25c) (2) ............................................................. 2.5w storage temperature............... -65c to +155 c junction temp???????..-40 c to +150 c recommended operating conditions input voltage operating range???.2.5v to 4v operating junct. temp (t j )??.-40 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 continuous power 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 circuitry protects the device from permanent damage. 3) measured on jesd51-7 4-layer board.
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 3 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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 44 82 on resistance (4) r dson t j =+80 c 95 m ? off state output voltage v off enable=0v, r l =500 ? 120 mv thermal latch shutdown temperature t sd 175 c under/over voltage protection output clamping voltage v clamp overvoltage protection v in = 6v 4 4.5 5.0 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 mv current limit short circuit current limit (4) (hold current) i lim r limit =24 ? 1.2 1.55 1.9 a trip current i lim-ol r limit =24 ? 2.5 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 intermediate level input voltage v i (int) thermal fault, output disabled 0.8 1.4 2.0 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 -28 -50 a maximum fanout for fault signal total number of chips that can be connected for simultaneous shutdown 3 units maximum voltage on enable pin v max note 6 v in v total device device operational 1.5 2.0 bias current i bias thermal shutdown 0.9 ma 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 6.0v if v in 6.0v. maximum input voltage to be v in if v in 6.0v.
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 4 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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 tri-state, bi-direc tional interface. it can be used to enable the output of the device by floati ng the pin, or disable the chip by pulling it to ground (using an open drain or open collector devic e). if a thermal fault occurs, the voltage on this pin will go to an intermediate state to signal a monitoring circuit that the device is in thermal shutdown. 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).
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 5 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in = 3.3v, v en =3.3v, r limit =24 ? , c out =10f, cdv/dt=1nf, t a =25c, unless otherwise noted. supply current,output disabled vs. input voltage v en =0 supply current,output enabled vs.input voltage no load,en floating 1.5 1.55 1.6 1.65 1.7 1.75 1.8 2.5 3 3.5 4 4.5 input voltage(v) supply current(ma) 0.76 0.78 0.8 0.82 0.84 0.86 0.88 0.9 2.533.544.5 input voltage(v) supply current(ma) static drain-source on-state resisitance vs. input voltage i out =1a input voltage(v) input to output voltage vs. load current 0 20 40 60 80 100 120 0 0.5 1 1.5 2 2.5 load current(a) input to output voltage(mv) input voltage(v) hold current(a) input voltage(v) trip current(a) current limit response vs. peak current no c out 0 5 10 15 20 25 3 6 9 121518212427 peak current(a) trip current && hold current(a) trip and hold current vs. r limit 40 45 50 55 60 65 2.7 3.3 3.9 4.5 1.5 1.6 1.7 1.8 2.7 3.3 3.9 4.5 2.3 2.4 2.5 2.6 2.7 2.7 3.3 3.9 4.5 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 0 20 40 60 80 100 120 trip current hold current v in =3.3v v in =4.2v v in =3v v in =3.6v
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 6 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in = 3.3v, v en =3.3v, r limit =24 ? , c out =10f, 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,no load trip current with ramped load on enabled device en 2v/div i out 500ma/div 1ms/div v out 2v/div en 2v/div 10ms/div v out 2v/div en 2v/div 1ms/div 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 en 2v/div i out 1a/div i out 1a/div 400ms/div short circuit current,device enabled into short, and thermal shut down en floating en 2v/div i out 1a/div v out 2v/div en 2v/div i out 1a/div
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 7 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in = 3.3v, v en =3.3v, r limit =24 ? , c out =10f, cdv/dt=1nf, t a =25c, unless otherwise noted. v out 2v/div i out 2a/div v out 2v/div i out 2a/div peak current peak current response time response time
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 8 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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?functional block diagram
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 9 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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) 3.90 2.50 1.70 1.37 hold current (a) 2.99 1.55 0.74 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 be shutdown 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 three level i/o with a weak pull up current (25ua typical). the three levels are low, mid and high. it functions to enable/disable the part and to relay fault information. enable pin as an input: 1. low and mid disable the part. 2. low, in addition to disabling the part, clears the fault flag. 3. high enables the part (if the fault flag is clear). 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, and will clear the fault flag. 3. a thermal fault will cause a mid level on the enable pin, and will set the fault flag. the enable/fault line must be above the mid level for the output to be turned on.
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 10 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the fault flag is an internal flip-flop that can be set or reset under various conditions: 1. thermal shutdown: set fault flag 2. under voltage: reset fault flag 3. low voltage on enable/fault pin: reset fault flag 4. mid voltage on enable/fault pin: no effect 5. under a fault, the enable/fault pin is driven to the mid level. 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 mp5002 chips in a system, the enable/fault lines are typically connected together. 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 is latched off until a uvlo or externally driven to ground. internally drives enable/fault pin to mid level flag is set secondary part output is disabled. 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 fault line is released. when the fault line is released it will be pulled high by a 25ua current v out . no external pull up resistor is required. in addition, the pull up voltage is limited to 5 volts. thermal protection when thermal protection is triggered, the output is disabled and the fault line is driven to the mid level. the thermal fault condition is latched (meaning the fault flag is set), and the part will remain latched off until the fault (enable) line is brought low. cycling the power below the uvlo threshold will also reset the fault flag.
mp5002 ? 3.3v, 1a-3a programmable current limit switch mp5002 rev. 0.93 www.monolithicpower.com 11 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. 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 3?pcb layout
mp5002 ? 3.3v, 1a-3a programmable current limit switch 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. mp5002 rev. 0.93 www.monolithicpower.com 12 10/15/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 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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