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MP5018 5v, 1a-5a current limit switch with reverse current blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 1 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the MP5018 is a protection device designed to protect circuitry on the output from transients on input (v cc ). it also protects v cc from undesired shorts and transients coming from the output. at startup, inrush current is limited by the slew rate at the output. the slew rate is controlled by a small capacitor at the ss pin. floating the ss pin provides 13ms soft-start time. the maximum load at the output is current limited. the magnitude of the current limit is controlled by an external resistor from ilimit to gnd. floating ilimit pin provides 3a fixed current limit. by controlling the gate voltage of a pair of n-channel mosfets, any current flowing from output to input is blocked. under voltage lockout (uvlo) assures that input is above the minimum operating threshold, before the power device is turned on. if input voltage goes above 5.8v, the output voltage will be limited at 5.8v with fast response. the en/fault pin is a bi-directional, three-level i/o with a weak pull-up. it can be used to enable or disable MP5018, or indicate a fault condition. the device is available in a qfn12 (2mmx3mm) package. features ? sas disable to support devslp or power_down ? 4.5v to 5.5v continued operating input range ? 16v absolute maximum input voltage ? 5.8v fast ovp response ? reverse current blocking ? integrated 45m ? power fet ? adjustable current-limit or fixed current limit when floating ilimit pin ? 210 a typical low quiescent current ? adjustable soft start time ? fault indication ? latch-off thermal protection ? available in qfn12(2mmx3mm) package ? esd compliant to 2kv hbm and 1kv cdm applications ? hdd, ssd ? hot swap systems ? gaming ? set-top boxes/smart tv ? pcie cards ? switches/routers all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 2 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking MP5018gd qfn-12 (2mmx3mm) see below * for tape & reel, add suffix ?z (e.g. MP5018gd?z); top marking ama: product code of MP5018gd; y: year code; lll: lot number; package reference qfn-12 (2mmx3mm) absolute maxi mum ratings (1) v in ...................................................-0.3v to 16v v out ............................................................. 6.3v all other pins .................................?0.3v to +6v junction temperature .............. -40c to +150c lead temperature ....................................260c continuous power dissipation (t a =+25c ) (2) qfn-12 (2mmx3mm) ................................. 1.8w recommended operating conditions (3) continued operation v in .................4.5v to 5.5v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc qfn-12 (2mmx3mm) .............? 70........15 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 powe r 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) the device is not guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 3 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics v in = 5v, t j =25c, unless otherwise noted. parameter symbol condition min typ max units supply current en=1, sas=0, i load =0 210 250 a fault latch off 170 a en=0, sas=0 (or float) 50 a quiescent current i q sas=1 5 a power fet on resistance r dson t j =25c 45 58 m ? on resistance (5) r dson t j =80c 54 m ? turn-on delay t delay en=2.5v to i d =100ma with 1a load resistor 500 s off-state leakage current i off v in =12v, en=0v 1 a soft start ss time t ss ss pin float, vout=0%-100% 10.4 13 15.6 ms ss current i ss short ss to gnd or add ss cap 6.5 a current limit float ilimit pin 2.5 3 3.5 a r set =499 ? 1.8 2.3 2.7 a current limit at normal operation i limit_no r set =1.4k ? 0.5 0.8 1.1 a short circuit current limit (5) i limit_sc float ilimit pin 3 a current limit response time (5) t cl i limit =3a, add 1 ? load resistor 5.5 10 40 s secondary current limit (6) i limith any value of r iset 12 a under voltage protection under voltage lockout threshold v uvlo uvlo rising threshold 3.8 4.0 4.2 v uvlo hysteresis v uvlohys 300 mv under voltage response (5) t uv 2 s reverse current limit reverse current limit i reverseh latch off and pull en to mid level voltage 0.9 1.2 1.5 a reverse current limit response time (5) t sc vin dv/dt = -5v/1ms 5 7 10 s over voltage protection over voltage clamp voltage v ovlo 5.5 5.8 6.1 v
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 4 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics (continued) v in = 5v, t j =25c, unless otherwise noted. parameter symbol condition min typ max units over voltage response time (5) t ov cout=20uf, vin=5v to 12v 10 40 s thermal shutdown shutdown temperature (5) t std latched off until enable = 0, sas = 1, por 130 175 200 c enable/fault low level input voltage v il uvlo, sas disable 0.35 0.8 v intermediate level input voltage v i (int) thermal fault, fast reverse current limit 0.9 1.3 1.95 v high level input voltage v ih output enabled 2.1 3.3 v maximum high state v enh 3.4 5.2 v logic low sink current i eh_pl en=0v -12 -20 a logic level high current i h en = 3.3v 1 a maximum fanout for fault signal total number of chips that can be connected for simultaneous shutdown 3 units sas disable low level input voltage v enn_l en=1, output enabled 0.35 0.7 v high level input voltage v enn_h output disabled, en=low 2.1 v maximum pin voltage sash max 3.3 v input impedance r enn to gnd 350 700 1000 k ? deglitch filter t sasdg 2 50 s notes: 5) guarantee by characterization test. 6) guarantee by design.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 5 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics v in =5v, v en =5v, i limit pin float, ss pin float, sas pin float, c out =22 f, t a =25c, unless otherwise noted. 40 43 46 49 52 55 4 4.3 4.6 4.9 5.2 5.5 28 34 40 46 52 3.9 4.4 4.9 5.4 5.9 6.4 195 210 225 240 255 270 285 300 3.7 4.2 4.7 5.2 5.7 6.2 6.7 2 2.5 3 3.5 4 4.5 4 4.3 4.6 4.9 5.2 5.5 0 1 2 3 4 5 6 0 200 400 600 800 1000 1200 0 20 40 60 80 100 120 140 0 0.5 1 1.5 2 2.5
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 6 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in =5v, v en =5v, i limit pin float, ss pin float, sas pin float, c out =22 f, t a =25c, unless otherwise noted.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 7 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in =5v, v en =5v, i limit pin float, ss pin float, sas pin float, c out =22 f, t a =25c, unless otherwise noted.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 8 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in =5v, v en =5v, i limit pin float, ss pin float, sas pin float, c out =22 f, t a =25c, unless otherwise noted.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 9 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions pin # name description 1, 2, 3 vcc supply voltage. the MP5018 support 4.5v to 5.5v continuous input voltage and up to 16v maximum transient input voltage. requir es ceramic capacitor to decouple the input rail. connect using a wide pcb trace. 4 sas sas=low to enable the part. sas=high to di sable the part. sas pin has internal 700k ? pull-down resistor to ground, so it can automatically start up when sas is floating. 5 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 floating the pin, or dis able the chip by pulling it to ground (using an open drain or open collector device). if a ther mal fault occurs or reverse current limit is triggered, the voltage on this pin will go to an intermediate state to signal a monitoring circuit that there is a device fault. when uvlo or sas disable = 1, the voltage on this pin will go to a low state. it can also be connected to another devic e in this family to cause a simultaneous shutdown. 6 nc no connection. 7 ss soft start pin. connect a capacitor from ss to ground to set the soft start time. floating this pin provides 13ms soft start time. 8 ilimit current limit set pin. place a resistor between this pin and ground to set the value of the current limit. floating this pin provides 3a fixed current limit. 9, 10, 11 vout the output voltage that is controlled by the ic. 12, pad gnd system ground.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 10 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. functional block diagram charge pump ldo current sense 1v ref ilimit vout ss control logic uvlo ovp 1.23v en/fault 4ua 8ua 80k vdd gnd fast off comp current limit amp soft start thermal sense 6.5ua 5v reverse comp x10 vout sas vdd flt logic 13ms 0.7m vdd logic for ilimit floating vcc figure 1: functional block diagram
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 11 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the MP5018 is designed to limit the inrush current to the load when a circuit card inserts into a live backplane power source, thereby limiting the backplane?s voltage drop and the dv/dt of the voltage to the load as well. it offers an integrated solution to monitor the input voltage, output voltage, output current, and die temperature which eliminates the requirement of external current sense power resistor, power mosfet and thermal sense device. under-voltage lockout (uvlo) if the supply voltage is below the uvlo threshold, the output is disabled, and the en/fault line is driven low. when the supply goes above the uvlo threshold, the output is enabled and the en/fault is pulled high. the nominal input supply voltage is 5v but there are high energy transients during normal operation or during hot swap . those transients depend on the parasitic inductance and resistance of the wire along with capacitor at v cc node. if power clamp (tvs, tranzorb) diode is not used, e-fuse must be able to withstand this transient voltage. MP5018 integrates high voltage mosfet up to 16v and also uses high voltage circuit for v cc node to guarantee safe operation. fast output over voltage clamp (ovp) to protect the downstream loading when there is a surge voltage at input, MP5018 provides an accurate and fast comparator to monitor the over voltage condition of output. if the output voltage rises above the threshold (5.8v), the gate of internal mosfets is quickly pulled down and it?s regulated to a certain value to maintain the output voltage clamped at 5.8v. the fast loop response speed (10s typical) keeps the over voltage overshoot small. current limit the MP5018 provides a constant current limit and the current limit can be programmed by external resistor. once the current limit threshold is reached, the internal circuit will regulate gate voltage to hold the current in power fet constantly. in order to limit the current, the gate to source voltage needs to be regulated from 5v to around 1v. the typical response time is about 10s, during this period the output current may have a small overshoot. the desired current limit is a function of the external current limit resistor. MP5018 allows ilimit pin floating operation. if ilimit pin is floating, the current limit will be set as fixed 3a internally. reverse current blocking the MP5018 integrates a pair of back-to-back n channel mosfets for reverse current protection. once the reverse current limit threshold (-1.2a) is reached and exceed 7 s deglitch time, the internal circuit will shutdown the pair of mosfets. meanwhile, the en/fault line is driven to middle level; reverse current is totally blocked and this state continues until vcc > vout-2mv. when vcc >vout-2mv, part resumes normal operation with soft-start control. whenever the input voltage drops below uvlo threshold, back-to-back mosfets are turned off and the part is shut down; therefore, there is no reverse current during this condition. short circuit protection if the load current increases rapidly due to short circuit event, the current may exceed the current limit threshold before control loop able to respond. if the current reaches 12a secondary current limit level, there is a fast turn off circuit active to turn off the power fet with 100ma pull-down gate discharge current, as shown in figure 1. this can help to limit the peak current through the switch, thus keep the input voltage not drop too much. the total short circuit response time is about 1s. after the fet is switched off, the part will restart. during the restart process, if the short still exist, MP5018 will regulate the gate voltage to hold the current at normal current limit level.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 12 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. en control/fault indication the en pin enables the part when high and disables the part when low. floating the en pin will set the part auto startup because there is internal current source pull up en to internal supply. the maximum internal pull up voltage source is about 5v. en/fault pin is also a bi- directional function node. when the part entersthermal shutdown, en/fault pin outputs middle level voltage ~1.3v to indicate fault condition occurred. when v in v out -2mv) sas floating high on n/a sas = low high on n/a sas control the sas pin also can control the part startup and shutdown. when floating this pin or pull it low, it enables the part and disables the part when pull high. soft-start floating ss pin can get 13ms soft start time. while a capacitor connected to the ss pin can set the soft start time. a constant current source charges the ss capacitor and results in a linear ramping voltage on the ss pin. the output voltage rises at a similar slew rate to the ss voltage. the soft-start time can be calculated as follows: ss ss 1v c (n f ) t(ms) 6.5 a = where: t ss =soft start time for example, a 22nf capacitor gives a soft start time of ~3.4ms. if the load capacitance is extremely large, the current required to maintain the preset soft start time will exceed the current limit. in this case the rise time is controlled by the load capacitor and the current limit. thermal shutdown ? latch off thermal shutdown prevents the chip from operating at exceedingly high temperature. when the silicon die reaches temperature that exceeds 175c, it shuts down the whole chip, and drives the enable/fault line to the middle (mid) level. the chip is latched off after trigger the thermal protection and it restarts when toggle the en or sas or recycle the input supply.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 13 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information setting the current limit the MP5018 current limit value should exceed the normal maximum load current, allowing the tolerances in the current sense value. the current limit is a function of the external current- limit resistor. table 2 and figure 2 list examples of current limit values as a function of the resistor value. table 2: current limit vs. current limit resistor current limit resistor ( ? ) 1070 560 442 274 215 current limit (a) 1 2 2.5 4 5 figure 2: current limit vs. current limit resistor pcb layout guide (7) pcb layout is benefit for better performance. please follow these guidelines and use figure 3 as reference. 1. place the high-current paths (vcc and vout) close to the device using short, direct, and wide traces. 2. place the input capacitors as close to the vcc and gnd pins as possible. 3. connect the vcc and vout pads to large copper to achieve better thermal performance. 4. place current limit resistor r1 close to the ilimit pin. 5. place ss capacitor c2 close to ss pin. note: the recommend layout is based on the typical application circuit shown in figure 4. c1 c3 c2 r1 en sas gnd gnd vcc vcc vcc vout vout vout gnd top layer bottom layer gnd figure 3: pcb layout design example below is a design example following the application guidelines for the given specifications: table 3: design example v in (v) 5 current limit (a) 3 ss time (ms) 13 the detailed application schematic is shown in figure 4. the typical performance and circuit waveforms have been shown in the typical performance characteristics section. for more detailed device applications, please refer to the related evaluation board datasheets of MP5018.
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp MP5018 rev. 1.02 www.monolithicpower.com 14 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits c1 10 f c3 22 f ss en/fault sas ilimit gnd vout vout vout r1 (optional ) vin vout 1 2 3 4 5 7 8 9 10 11 12, pad power_dn enable nc 6 vcc vcc vcc c2 (optional ) MP5018 figure 4: 5v v in application MP5018 c3 10 f c4 22 f ss en/ fault sas ilimit gnd vout vout vout r1 (optional) 5v vout2 1 2 3 4 5 7 8 9 10 11 12, pad power_dn nc 6 vcc vcc vcc c5 (optional) mp5000s c1 10 f c2 22 f gnd dv/dt source rlimit vout1 5 4 3 2 1 10 9 8 7 6 n/c i-limit enable/fault source source source source vcc 11 12v c dv/dt figure 5: simultaneous shutdown application
MP5018 ?5v, 1a-5a current limit switch with reverse curr ent blocking and output over-voltage clamp 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. MP5018 rev. 1.02 www.monolithicpower.com 15 3/23/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information qfn-12 (2mmx3mm)

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