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mp5010a 3v18v, 1a5a programmablecurrent limit switch with overvoltage clamp mp5010a rev. 1.0 www.monolithicpower.com 1 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. the future of analog ic technology description the mp5010a is a protection device designed to protect circuitry on the output (source) from transients on the input (v cc ). it also protects the input from undesired shorts and transients coming from the source. a small capacitor on the dv/dt pin controls the slew rate that limit the inrush current at the source. for instance, a 1nf capacitor results in a source rampup time of 3ms. the maximum load at the source is current limited using a sense fet topology. an external resistor between the ilimit pin and the source pins controls the magnitude of the current limit. an internal charge pump drives the gate of the power device, allowing the dmos power fet to have a very low onresistance of just 40m. the mp5010a also protects the source from the input being too low or too high. undervoltage lockout ensures that the input remains above the minimum operating threshold before the power device turns on. if the input rises above the high output threshold, the mp5010a limits the source voltage. features ? wide 3vto18v operating input range ? 5.7v output overvoltage clamp ? integrated 40m power fet ? enable/fault pin ? adjustable output voltage slew rate ? adjustable current limit ? thermal protection applications ? hotswappable devices ? wireless modem data cards ? pc cards ? laptops typical application all mps parts are lead free and adhere to the rohs directive. for mps green status, please visit mps website under products, qu ality assurance page. mps and the future of analog ic technology are registered trademarks of monolithic power systems, inc.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 2 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. ordering information part number* package top marking MP5010ADQ qfn10 (3mm3mm) adv * for tape & reel, add suffix Cz (e.g. MP5010ADQCz). for rohs compliant packaging, add suffix Clf (e.g. MP5010ADQlfz). package reference 12 3 4 5 10 98 7 6 absolute maximum ratings (1) v cc , source, ilimit ................. C0.3v to 22v dv/dt, enable/fault .................... C0.3v to 6 v storage temperature .............. C65c to +155c junction temperature .............................. . +150c lead temperature .................................. .. +260c continuous power dissipation (t a =+25c) (2) .................................................. ................ 2.5w recommended operating conditions (3) input voltage operating range ......... 3v to 18v operating junction temp. (t j ) ...... 40c to +125c thermal resistance (4) ja jc qfn10 (3mmx3mm) ............... 50 ...... 12 ... c /w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissipation is a functi on of the maximum junction temperature t j (max) the junctionto ambient thermal resistance ja and the ambient temperature t a, the maximum allowable power dissipation at any ambi ent temperature is calculated using: p d (max)=(t j (max)t a )/ ja . exceeding the maximum allowable power dissipation w ill cause excessive die temperature, and the regulator will go into thermal shut down. internal thermal shutdown circuitry protects the device from permanent damage. reduce 0.2 watts for every 10 o c ambient temperature increasing 3) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd517 4layer board.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 3 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. electrical characteristics v cc = 5v, r limit =22, capacitive load= 10 f, t a =25c, unless otherwise noted. parameters symbol condition min typ max units power fet delay time dly enabling of chip to i d =40ma with a 5 resistive load 44 s on resistance r dson t j =25c 40 55 m t j =85c (5) 52 offstate output voltage v off v cc =18v, v en =0v, r l =500 120 mv continuous current i d 0.5 in 2 pad, t a =25c 4.2 a minimum copper, t a =80c 2.3 thermal latch shutdown temperature (5) t sd 175 c under/over voltage protection output clamp voltage v clamp overvoltage protection v cc =8v 5.5 5.7 5.9 v undervoltage lockout v uvlo rising edge 2.65 2.8 2.9 v undervoltage lockout (uvlo) hysteresis v hyst 0.15 v current limit ( 6 ) ( for direct cur rent sense , refer to typical application in figure 5) hold current i limss 0 short resistance, r lim =22 1.5 2.13 2.8 a trip current i lim ol r lim =22 2.98 a current limit ( 6 ) ( for kelvin sense , refer to typical application in figure 4 ) hold current i limss 0 short resistance, r lim =22 0.6 0.95 1.25 a trip current i lim ol r lim =22 1.55 a dv/dt circuit rise time ( 7 ) r c dv/dt =1nf 2 3 4 ms enable/fault lowlevel input voltage v il output disabled 0.5 v intermediatelevel input voltage v i (int) thermal fault, output disabled 0.82 1.4 1.95 v highlevel input voltage v ih output enabled 2.5 v highstate maximum voltage v i (max) 4.95 v pullup current (source) i il v enable =0v 15 25 35 a maximum fanout for fault signal maximum number of chips for simultaneous shutdown 3 units maximum voltage on en ( 8 ) v max vcc v
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 4 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. electrical characteristics (continued) v cc = 5v, r limit =22, capacitive load= 10 f, t a =25c, unless otherwise noted. parameters symbol condition min typ max units total device bias current i bias device operational 815 900 a thermal shutdown 580 650 minimum operating voltage for uvlo v min enable<0.5v 2.5 v notes: 5) guaranteed by design. 6) guaranteed by characterization test. 7) measured from 10% to 90%. 8) maximum input voltage on enable pin to be 6v if vcc 6v. maximum input voltage on enable pin to be vcc if vcc 6v.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 5 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. typical performance characteristics v in = 5v, v en =5v, r limit =22, c out =10f, c dv/dt =1nf, t a =25c, unless otherwise noted. input to output voltage vs. load current hold current vs. input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10 20 30 40 50 60 70 80 90100 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 10 20 30 40 50 60 70 80 90 100 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10 20 30 40 50 60 70 80 90 100 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 0 10 20 30 40 50 60 70 80 90100 500 600 700 800 900 1000 3 3.5 4 4.5 5 5.5 300 350 400 450 500 550 600 3 3.5 4 4.5 5 5.5 30 35 45 50 55 60 3 3.5 4 4.5 5 5.5 0 20 40 60 80 100 120 140 0 0.5 1 1.5 2 2.5 1 1.5 2 2.5 3 3 3.5 4 4.5 5 5.5 hold current trip current hold current trip current hold current trip current hold current 40
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 6 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v en =5v, r limit =22, c out =10f, c dv/dt =1nf, t a =25c, unless otherwise noted. 1 1.5 2 2.5 3 3.5 4 3 3.5 4 4.5 5 5.5 0 3 6 9 12 15 4 8 12 16 20
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 7 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v en =5v, r limit =22, c out =10f, c dv/dt =1nf, t a =25c, unless otherwise noted. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 1a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 8 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v en =5v, r limit =22, c out =10f, c dv/dt =1nf, t a =25c, unless otherwise noted. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div. v ou t 2v/div. i ou t 1a/div. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div. v ou t 2v/div. v in 5v/div. i ou t 2a/div. en 5v/div. v in 5v/div. en 5v/div. v ou t 2v/div. i ou t 1a/div.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 9 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. pin functions pin # name description 15 source source. internal power fet source. ic ou tput. 6 n/c do not connectleave floating. 7 ilimit current limit. using a resistor between this pin an d source to set the overload and shortcircuit currentlimit levels. 8 enable/fault enable/fault. a tristate, bidirectional interface . leave floating to enable the output. pull to ground (using an open drain or open collector device) to disable the output. if a thermal fault occurs, this voltage enters an intermediate state to signal that the device is in thermal shutdown. 9 dv/dt slew rate. the internal dv/dt circuit controls the slew rate o f the output voltage at turnon. 10 gnd ground. internal ic reference. 11 exposed pad v cc input. positive input voltage. block diagram therm al shutdow n latch c ontrol logic se t enable/ fault 5v 25 a 28k 2.5v 2v h ys r ese t m 1 r 1 d 1 u 1 u 2 u 3 vcc uvlo dv/dt c ontrol g n d dv/dt c harge pum p voltage clam p vc c c urrent lim it source i-lim it figure 1: functional block diagram
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 10 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. operation the mp5010a limits the inrush current to the load when a circuit card connects to a live backplane power source, thereby limiting the backplanes voltage drop and the dv/dt of the voltage to the load. it offers an integrated soluti on to monitor the input voltage, output voltage, output current, and die temperature, eliminating the external currentsense power resistor, power mosfet, and thermal sensor. undervoltage lockout operation if the supply (input) is below the uvlo threshold, the output is disabled, and the en/fault line is driven low. when the supply rises above the uvlo threshold, the output is enabled and the en/fault is pulled high through a 25a current source without an external pullup resistor. the pullup voltage is limited to 4.95v. output overvoltage protection if the input voltage exceeds the overvoltage protection (ovp) threshold, the output is clamped at 5.7v (typ). current limiting when the chip is active, if load reaches the over current protection (ocp) threshold (trip current) or a short is present, the part switches to constantcurrent mode (hold current). the chip shuts down only if the overcurrent condition eventually triggers thermal protection. however, when the part is powered up by v cc or en, the load current should be smaller than the hold current. otherwise, the part cant be fully turned on. in a typical application with a currentlimiting resistor of 22, the trip current is 1.55a for kelv in current sensing and 2.98a for direct current sensing. if the device is in normal operation and passing 2.0a, it will only need to dissipate 160mw with the low on resistance of 40m. for a package dissipation of 50c/watt, the temperature rise is +8c. given a 25c ambient temperature, the typical package temperature is 33c. the mp5010a requires a heat sink during constantcurrent mode (such as from a short circuit) to prevent unwanted shutdown: in constantcurrent mode, the chip must dissipate the power from a 5v drop. without additional heat dissipation at 50c/watt, the temperature would exceed the thermal threshold (+175c) and the mp5010a will shutdown to force the temperature to drop below a hysteresis level. without a heat sink, maintain the current below 600ma at + 25c and below 360ma at +85c to prevent thermal shutdown. thermal protection if the temperature exceeds the thermal threshold, the mp5010a disables its output and drives the enable/fault line to the middle (mid) level (read the following enable/fault pin section for more information). the thermal fault condition is latched, and the part remains off until the enable/fault line goes low. cycling the power below the uvlo threshold will also reset the fault flag. fault and enable pin the enable/fault pin is a bidirectional, three level i/o with a weak pullup current (25a, typ.). the three levels are low, mid, and high. it functions to enable/disable the part and to relay fault information. enable/fault 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/fault as an output: 1. the pullup current will allow a wired nor pullup to enable the part (if not overridden). 2. an undervoltage condition will cause a low on the enable/fault pin, and will clear the fault flag. 3. a thermal fault will set a mid on the enable/fault pin, and will set the fault flag
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 11 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. the enable/fault line must remain above the mid level for the output to turn on. the fault flag is an internal flipflop that can be set or reset under the following conditions: 1. thermal shutdown: set fault flag 2. undervoltage: reset fault flag 3. low on enable/fault pin: reset fault flag 4. mid on enable/fault pin: no effect given a fault, the enable/fault pin is driven to mid. 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 there are one or more of the mp5010a chips in a system. the enable/fault lines are typically be connected together. table 1fault function influence in application fault description internal action effect on fault p in effect on flag effect on secondary part short/over current limit current none none none under voltage output turns off internally drives enable/fault pin to logic low flag is reset disables secondary output, and resets fault flag. over voltage limit output voltage none none none thermal shutdown shutdown. the part is latched off until a uvlo or externally driven to ground. internally drives enable/fault pin to mid flag is set disables secondary part output.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 12 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. application information current limit the current limit is a function of the external currentlimit resistor. table 2 and table 3 list examples of current values as a function of the resistor value for both kelvin current sensing and direct current sensing. rise time the rise time is a function of the capacitor (c dv/dt ) on the dv/dt pin. table 4 lists typical rise times as a function of capacitance. table 2: current limit vs. current limit resistor ( v cc =5v, kelvin current sensing) r limit ( ) 10 22 51 75 100 trip current (a) 1.69 1.55 1.43 1.39 1.37 hold current (a) 1.29 0.95 0.61 0.48 0.4 table 3: current limit vs. current limit resistor ( v cc =5v, direct current sensing) r limit ( ) 13 16 22 51 75 100 270 trip current (a) 4.32 3.69 2.98 2.05 1.82 1.72 1.53 hold current (a) 3.74 2.99 2.13 0.96 0.68 0.53 0.22 table 4: rise time vs. c dv/dt c dv/dt 330pf 1nf 3.3nf 6.8nf rise time (typ., ms) 1.1 3 9.4 19.2 * notes: rise time = k rt *(50pf+c dv/dt ), k rt =2.8e6 the rise time is measured by from 10% to 90% of output voltage. u 90% 10% rise time t inputoutput enable figure 2rise time pcb layout pcb layout is very important to achieve stable operation. please follow these guidelines and use figure 3 as reference.
mp5010a C 3v16v, 3a programmable current limit sw itch mp5010a rev. 1.0 www.monolithicpower.com 13 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2013 mps. all rights reserved. ? place r limit close to the ilimit pin ? place c dv/dt close to dv/dt pin ? place the input capacitor close to the v cc pin. ? leave the n/c pin floating. ? place vias in the thermal pad and provide enough copper area near the v cc pin and source pin for thermal dissipation. source c2 en/ fault dv/dt 5 4 3 2 1 6 7 8 9 10 i_limit n/c gnd gnd vin vout c4 c3 source source source source en/ fault vin cdv/dt r limit top layer vin bottom layer figure 3: pcb layout design example below is a directcurrentsensing design example following the application guidelines for the given specifications: table 5: design example v in 5v trip current 3a hold current 2.1a figure 5 shows the application schematic is shown. the typical performance characteristics section shows the circuit waveforms. for more device applications, please refer to the related evaluation board datasheets.
mp5010a C 3v18v, 1a5a programmable current limit switch mp5010a rev. 1.0 www.monolithicpower.com 14 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2012 mps. all rights reserved. typical application circuits figure 4: typical application schematic with kelvin current sensing figure 5: typical application schematic with direct current sensing
mp5010a C 3v18v, 1a5a programmable current limit switch notice: the information in this document is subject to cha nge without notice. users should warrant and guaran tee that third party intellectual property rights are not infringe d upon when integrating mps products into any appli cation. mps will not assume any legal responsibility for any said applic ations. mp5010a rev. 1.0 www.monolithicpower.com 15 2/7/2013 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohib ited. ? 2013 mps. all rights reserved. package information qfn10 (3mm 3mm) side view top view 1 10 6 5 bottom view 2.90 3.10 1.451.75 2.903.10 2.252.55 0.50 bsc 0.180.30 0.801.00 0.000.05 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 flas h. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-229, variation vee d-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 0.300.50 pin 1 id index area

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