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mp6219 5v, 1a ? 2a programmable current limit power distribution switch mp6219 rev.0.93 www.monolithicpower.com 1 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. the future of analog ic technology description the mp6219 is a protection device designed to protect circuitry on the output from transients on input. it also protects input from undesired shorts and transients coming from the output. the mp6219 is an integrated power switch with programmable current limit. the max load at the output is current limited. this is accomplished by utilizing a sense fet topology. the magnitude of the current limit is controlled by an external resistor. an internal charge pump drives the gate of the power device. it features a 44m ? switch for high efficiency and requires minimal external components. the mp6219 features current protection and thermal shutdown for fault control. it also involves uvlo and output over voltage protection. the mp6219 is available in an 8-pin soice package. features ? integrated 44m ? fet ? adjustable current limit to 2a ? optimized for 5v inputs ? enable active high ? 1.1ms soft-start rise time ? ul file # e322138 applications ? usb power distribution ? pci bus power ? notebook pc ? inrush current limit ? heavy capacitive loads typical application mp6219 in out out out n.c. i prgm en/fault r prgm gnd 8 1 2 3 4 7 6 5 input +5v to usb peripheral on/off input or fault output ul recognized component ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc.
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 2 10/20/2010 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 ) MP6219DN soic8e (exposed pad) MP6219DN ?40 c to +85 c * for tape & reel, add suffix ?z (e.g. MP6219DN?z). for rohs compliant packaging, add suffix ?lf (e.g. MP6219DN?lf?z) package reference 1 2 3 4 8 7 6 5 top view absolute maxi mum ratings (1) in, out, i prgm ................................................ 8v en/fault ..................................................... 6v junction temperature????.?40 c to +150 c continuous power dissipation (t a = +25c) (2) ............................................................. 2.5w storage temperature.............. ?65c to +155 c recommended operating conditions input voltage???????????.5v 10% operating junct.temp. ........... .-40 c to +125 c thermal resistance (3) ja jc soic8e ...................................50 ...... 10 ... 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.
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 3 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. electrical characteristics v in = 5v, r prgm =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, 12 ? resistive load 0.2 ms t j =25 c 44 82 on resistance r dson t j =80 c, note 4 95 m ? off state output voltage v off v in =8vdc, enable=0vdc, 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 =8v 5.95 6.65 7.35 v under voltage lockout v uvlo turn on, v in rising 3.2 3.6 4.0 v under voltage lockout (uvlo) hysteresis v hyst 0.1 v current limit current limit i lim-ss r prgm =24 ? 1.4 2.0 2.7 a trip current i lim-ol r prgm =24 ? 3.0 a slew rate output rise time t r note 5 1.1 ms en/fault low level input voltage v il output disabled 0.5 v intermediate level input voltage v i (int) thermal fault, output disabled 0.80 1.6 2.0 v high level input voltage v ih output enabled 2.5 v high state maximum voltage v i (max) 4.8 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, no load 1.5 2.0 supply current i q thermal shutdown 0.5 ma minimum operating voltage for uvlo v min enable<0.5v 3.0 v notes: 4) guaranteed by design. 5) measured from 10% to 90%. 6) maximum input voltage to be 6.0v if vin 6.0v. maximum input voltage to be vin if vin 6.0v.
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 4 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. pin functions pin # name description 1 in input to the device. 5v nominal input voltage 2, 3, 4 out this pin is the out put of the internal power fet. 5 i prgm a resistor between this pin and the output pin sets the overload and short circuit current limit levels. 6 n.c. no connect. 7 en/fault the en/fault pin is a tri-state, bi-directi onal 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. 8 gnd exposed pad negative input voltage to the device. this is used as the internal reference for the ic. connect exposed pad to gnd plane proper thermal performance.
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 5 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics v in = 5v, v en =3.3v, r prgm =24 ? , c out =10uf, t a =25c, unless otherwise noted. input votage (v) input votage (v) input votage (v) 3.5 4.5 5.5 6 5 4 load current (a) supply current, output disabled vs. input voltage v en =0v input voltage (v) supply current (ma) trip current (a) supply current (ua) input voltage (v) static drain-source on-state resistance vs. input voltage i out =0.5a peak current (a) input to output voltage vs. load current input to output voltage(mv) supply current, output enabled vs. input voltage v en =3.3v, no load 1.05 1.1 1.15 1.2 1.25 1.3 3.5 4 4.5 5 5.5 6 300 320 340 360 51 52 53 54 55 56 57 58 59 60 3.5 4 4.5 5 5.5 6 0 20 40 60 80 100 120 140 160 180 0 0.5 1 1.5 2 2.5 3 hold current vs. input voltage 1.6 1.9 2.2 2.5 3.5 4 4.5 5 5.5 6 hold current(a) trip current vs. input voltage 1.5 2 2.5 3 3.5 3.5 4 4.5 5 5.5 6 current limit response vs. peak current no c out 0 5 10 15 20 25 30 051015202530 response time(us) trip current and hold current vs. r prgm 0 1 2 3 4 0 20 40 60 80 100 120 trip current and hold current(a) v in =5v v in =4.5v v in =4v v in =5.5v trip current hold current
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 6 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, v en =3.3v, r prgm =24 ? , c out =10uf, t a =25c, unless otherwise noted. en 2v/div v out 2v/div en 2v/div v out 2v/div en 2v/div i out 1a/div en 2v/div i out 1a/div i out 1a/div v out 2v/div v out 2v/div i out 2a/div en 2v/div en 2v/div v out 2v/div en 2v/div v out 2v/div i out 1a/div 400us/div 200us/div 400us/div 40us/div 400us/div 100ms/div 2ms/div 1000uf 470uf 2200uf 100us/div 4ms/div turn off delay and fall time with 1uf load c out =1uf, no load trip current with ramped load on enabled device short circuit current device enabled into short and thermal shut down en floating short circuit current device enabled into short turn on delay and rise time with 1uf load c out =1uf, no load
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 7 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, v en =3.3v, r prgm =24 ? , c out =10uf, t a =25c, unless otherwise noted. v out 2v/div i out 5a/div 100us/div en 5v/div v out 2v/div i out 1a/div 200ms/div trip current=3.13a en=1.5v hold current=2.2a thermal shutdown
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 8 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. block diagram out in en/ fault enable thermal shutdown uvlo voltage clamp dv/dt control current limit charge pump i-limit gnd figure 1?functional block diagram
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 9 10/20/2010 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. table1-current limit vs. current limit resistor (v in =5v) current limit resistor 24 ? 50 ? 100 ? trip current 3.0a 2.25a 2.0a hold current 2.0a 1.1a 0.6a 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 3a and the hold current will be 2a. if the device is in its normal operating state and passing 2a it will need to dissipate only 176mw with the very low on resistance of 44m ? . for the package dissipation of 50c/watt, the temperature rise will only be + 8.8c. combined with a 25c ambient, this is only 33.8c total package temperature. during a short circuit condition, the device now has 5v across it and the hold current clamps at 2a and therefore must dissipate 10w. 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 600ma at + 25c and below 360ma at +85c to prevent the device from activating the thermal shutdown feature. en/fault pin the en/fault pin is a bi-directional three level i/o with a weak pull up current (28ua typical). the three levels are low, mid and high. it functions to enable/disable the part and to relay fault information. en/fault 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). en/fault 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 en/fault pin, and will clear the fault flag. 3. a thermal fault will cause a mid level on the en/fault pin, and will set the fault flag. the en/fault line must be above the mid level for the output to be turned on. the fault flag is a 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 en/fault pin: reset fault flag 4. mid voltage on en/fault pin: no effect under a fault, the en/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 en/fault pin and the internal fault flag. in a typical application where there are multiple mp6219 chips in a system, the en/fault lines are typically connected together.
mp6219 ? programmable current limit (2a) power distribution switch mp6219 rev.0.93 www.monolithicpower.com 10 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. table2-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 en/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 en/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 28ua current source. 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. pcb layout pcb layout is very important to achieve stable operation. please follow these guidelines and take below figure for reference. place r prgm close to i prgm pin and input cap close to in pin. keep the n/c pin float. put vias in thermal pad and ensure enough copper area near in and out to achieve better thermal performance. c1 gnd vin vout c3 c2 en/ fault 7 8 6 5 1 2 4 3 in out out out gnd en/ fault n/c i prgm r prgm gnd top layer bottom layer figure 2?pcb layout
mp6219 ? programmable current limit (2a) power distribution 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. mp6219 rev. 0.93 www.monolithicpower.com 11 10/20/2010 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2010 mps. all rights reserved. package information soic8e (exposed pad) see detail "a" 0.0075(0.19) 0.0098(0.25) 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.000(0.00) 0.006(0.15) 0.051(1.30) 0.067(1.70) top view front view side view bottom view note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation ba. 6) drawing is not to scale. 0.089(2.26) 0.101(2.56) 0.124(3.15) 0.136(3.45) recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) 0.103(2.62) 0.138(3.51) 0.150(3.80) 0.157(4.00) pin 1 id 0.189(4.80) 0.197(5.00) 0.228(5.80) 0.244(6.20) 14 85 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o 0.010(0.25) bsc gauge plane

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