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MPQ2451 industrial/automotive-grade 36v, 2mhz, 0.6a step-down converter aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 1 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. the future of analog ic technology description the MPQ2451 is a high frequency, step-down, switching regulator with an integrated high- voltage high-side power mosfet. it efficiently provides up to a 0.6a output with current-mode control for fast loop response. the wide 3.3v-to-36v input range accommodates a variety of automotive step-down applications, and the 3 a shutdown-mode quiescent current allows use in battery-powered applications. the MPQ2451 achieves high power-conversion efficiency over a wide load range by scaling down the switching frequency under light-load condition to reduce the switching and gate driving losses. frequency fold-back prevents inductor current runaway during start-up. thermal shutdown provides reliable, fault-tolerant operation. the MPQ2451 is available in a cost-effective sot23-6l and qfn-6l pack ages. features ? guaranteed industrial/automotive temp. range limits ? 130 a operating quiescent current ? wide 3.3v-to-36v operating input range ? 500m ? internal power mosfet ? 2mhz fixed switching frequency ? internally compensated ? stable with ceramic output capacitors ? internal soft-start ? precision current limit without current sensing resistor ? >90% efficiency ? output adjustable from 0.8v to 0.9v in ? 6-lead sot23 and qfn packages ? available in aec-q100 grade 1 applications ? high-voltage power conversion ? automotive systems ? industrial power systems ? distributed power systems ? battery-powered systems all mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MPQ2451 sw vin en fb gnd bst 1 5 6 3 4 c1 c3 33pf c4 100nf l1 d1 v in v out 5v/0.6a control efficiency v out =5v 60 55 50 0 0.1 0.2 0.3 0.4 0.5 0.6 65 70 75 80 85 90 95 efficiency (%) output current(a) v in =8v v in =12v v in =36v v in =24v
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 2 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. ordering information part number package top marking junction temperature (t j ) MPQ2451dt * sot23-6l v7 -40c to +125c MPQ2451dt-aec1 sot23-6l v7 -40c to +125c MPQ2451dg** qfn-6l v7 -40c to +125c MPQ2451dg-aec1 qfn-6l v7 -40c to +125c * for tape & reel, add suffix ?z (e.g. MPQ2451dt?z). for rohs compliant packaging, add suffix ?lf (e.g. MPQ2451dt?lf?z) ** for tape & reel, add suffix -z (e.g. MPQ2451dg-z) for rohs compliant packaging, add suffix -lf (e.g. MPQ2451dg-lf-z) package reference bst gnd fb 1 2 3 6 5 4 sw vin en top view sot23-6l qfn-6l absolute maxi mum ratings (1) supply voltage (v in )......................-0.3v to +40v switch voltage (v sw )............ -0.3v to (v in +0.3v) bst to sw ..................................... -0.3 to +5.0v all other pins ..............................?0.3v to +5.0v continuous power dissipation (t a = 25c) (2) sot23-6l ................................................ 0.57w qfn-6l .................................................... 1.56w junction temperature ...............................150c lead temperature ....................................260c storage temperature............... -65c to +150c recommended operating conditions (3) supply voltage v in ...........................3.3v to 36v output voltage v out ................... 0.8v to 0.9vin maximum junction temp. (t j ) ................+125c thermal resistance (4) ja jc sot23-6l ..............................220 .... 110 .. c/w qfn-6l ...................................80 ...... 16 ... 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.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 3 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. electrical characteristics v in = 12v, v en = 2v, t j = -40c to +125c, unless otherwise noted. typical values are at t j = 25c. parameter symbol condition min typ max units 4.0v < v in < 36v 0.774 0.794 0.814 feedback voltage v fb 3.3v < v in < 4.0v 0.766 0.794 0.822 v feedback bias current 0.05 1.0 a upper switch on resistance r ds(on) v bst -v sw =5v t j = 25c 500 m ? upper switch leakage v en = 0v, v sw = 0v 0.5 2 a current limit i lim 0.65 1 a comp to current sense transconductance g cs 3 a/v v in uvlo up threshold 2.7 3.29 v v in uvlo hysteresis 0.4 v soft-start time fb from 0 to 0.794v 0.5 1 ms oscillator frequency f sw 1.4 2 2.6 mhz minimum switch on time t on 100 ns shutdown supply current i s v en < 0.3v 3 30 a quiescent supply current i q no load, v fb =0.9, no switching 130 200 a thermal shutdown 150 c enable high threshold v ih low-to-high 1.35 1.5 1.8 v enable threshold hysteresis 400 mv
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 4 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pin functions sot23-6l pin # qfn-6l pin # name description 1 6 bst bootstrap. positive power supply for the internal floating high-side mosfet driver. connect a bypass capacitor between this pin and sw pin. 2 5 gnd ground. connect the output capacitor as close to this pin as possible. avoid routing near high-current switch paths. 3 4 fb feedback. input to the error amplifier. connected to an external resistive divider between output and gnd; com pared against the internal 0.8v reference to set the regulation voltage. 4 3 en enable input. pull this pin below the specified threshold to shut the chip down. pull it above the specified threshold to enable the chip. float this pin to disable the chip. 5 2 vin input supply. supplies power to all internal control circuitry; both bs regulators and the high side switch. requires a decoupling capacitor to ground close to this pin to reduce switching spikes. 6 1 sw switch node. output of the hi gh-side switch. requires a low v f schottky diode to ground close to this pin to reduce switching spikes.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 5 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical characteristics
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 6 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics v in = 12v, c1 = 4.7f, c2 = 10f, l = 3.3h and t a = 25c, unless otherwise noted. v sw 10v/div. . . v out (ac coupled) 10mv/div. i l 500ma/div v sw 10v/div. v sw 10v/div. v en 2v/div. v out (ac coupled) 10mv/div. v out 5 v/div. i l 500ma/div. i l 500ma/div. v sw 10v/div. v en 2v/div. v out 5 v/div. i l 500ma/div. v sw 10v/div. v en 2v/div. v out 5 v/div. i l 500ma/div. v sw 10v/div. v en 2v/div. v out 5 v/div. i l 500ma/div. efficiency v out =2.5v efficiency v out =3.3v steady state v in =12v,v out =5v,i out =0.1a steady state v in =12v,v out =5v,i out =0.6a startup through en v in =12v,v out =5v,i out =0.1a startup through en v in =12v,v out =5v,i out =0.6a 60 65 70 75 80 85 90 efficiency (%) 60 65 70 75 80 85 90 efficiency (%) 0 0.1 0.2 0.3 0.4 0.5 0.6 output current(a) 0 0.1 0.2 0.3 0.4 0.5 0.6 output current(a) 400ns/div. 400ns/div. shutdown through en v in =12v,v out =5v,i out =0.1a shutdown through en v in =12v,v out =5v,i out =0.6a 2ms/div. v in =6v v in =8v v in =12v v in =12v v in =24v
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 7 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. typical performanc e characteristics (continued) v in = 12v, c1 = 4.7f, c2 = 10f, l = 3.3h and t a = 25c, unless otherwise noted. v out 2v/div. i l 500ma/div v out 2v/div. i l 500ma/div short circuit entry i out =0a to short short circuit recovery i out = short to 0a
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 8 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. functional block diagram + - + - + - + - en reference uvlo 0.5ms ss logic oscilator 2mhz ss comp isw isw internal regulator vin fb gnd bst sw -- + 0.8v ss figure 1: functional block diagram
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 9 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. operation the MPQ2451 is a 2mhz, non-synchronous, step-down switching regulator with an integrated high-side high voltage power mosfet. it provides an internally-compensated, highly- efficient output of up to 0.6a with current mode control. it also features wide input voltage range, internal soft-start control, and a precision current limit. its very low operational quiescent current makes it suitable for battery-powered applications. pwm control at moderate-to-high output current, the MPQ2451 operates in a fixed-frequency peak- current?control mode to regulate the output voltage. a pwm cycle?initiated by the internal clock?turns the power mosfet on, and the mosfet remains on until its current reaches the value set by comp voltage. when the pwm signal goes low, the power switch turns off and remains off for at least 100ns before the next cycle starts. if the current in the power mosfet does not reach comp set current value within one pwm cycle, the power mosfet remains on to avoid a turn-off operation. pulse-skipping mode under light-load conditions, the MPQ2451 goes into pulse-skipping mode to improve efficiency. pulse-skipping triggers when the comp voltage drops below the internal sleep threshold, which generates a pause command to block the turn- on clock pulse so the power mosfet does not turn on; this procedure reduces gate driving and switching losses. this pause command causes the whole chip to enter sleep mode, reducing the quiescent current to further improve the light load efficiency. when the comp voltage exceeds the sleep threshold, the pause signal resets and the chip resumes normal pwm operation. whenever the pause changes state from low to high, the pwm signal immediately goes high and turns on the power mosfet. error amplifier the error amplifier is composed of an internal op- amp with an rc feedback network connected between its output node (internal comp node) and its negative input node (fb). when the fb voltage drops below the internal reference voltage (v ref ), the op-amp drives the comp output high, causing a higher switch peak current output and delivering more energy to the output. conversely, when the fb voltage rises above v ref , the switch peak current output drops. when using the fb pin, connect to the tap of a voltage divider that is connected between v out and gnd composed of r 1 and r 2 ; r 1 also serves to control the gain of the error amplifier in addition to the internal compensation rc network. internal regulator the 2.6v internal regulator powers most of the internal circuitry. this regulator takes the v in input and operates in the full vin range. when v in is greater than 3.0v, the output of the regulator is in full regulation. when v in drops below 3.0v, the output degrades. enable control the MPQ2451 has a dedicated enable control pin, en. when v in rises above threshold, the en pin can enable or disable the chip for high effective logic. its falling threshold is 1.2v, and its rising threshold is about 1.6v. when floated, the en pin is internally pulled down to gnd to disable the. when the en voltage is pulled to 0v, the chip enters the lowest shutdown current mode. when the en voltage rises above 0v but lower than rising threshold, the chip remains in shutdown mode with a slightly higher shutdown current. under voltage lockout (uvlo) v in under-voltage lockout (uvlo) protects the chip from operating at an insufficient supply voltage. the uvlo rising threshold is approximately 2.9v while its falling threshold is 2.6v.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 10 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. internal soft-start a reference-type soft-start (ss) prevents the converter-output voltage from overshooting during startup. when the chip starts, the internal circuitry generates a soft-start voltage (v ss ) that ramps up from 0v over the ss time. when v ss is less than v ref , v ss overrides v ref as the error amplifier reference. the maximum v ss is approximately the same as v fb ; i.e. if v fb falls, the maximum of v ss falls. this accommodates short-circuit recovery; when the short-circuit is removed, v ss ramps up to prevent output voltage overshoot. thermal shutdown thermal shutdown prevents thermal runaway. when the silicon die temperature exceeds its upper threshold, the entire chip shuts down. when the temperature drops below its lower threshold, the chip is enabled again. floating driver and bootstrap charging the floating power mosfet driver is powered by an external bootstrap capacitor. this floating driver has its own uvlo protection with a rising threshold of about 2.4v and a falling threshold of about 300mv. during this uvlo, v ss resets to zero. when the uvlo is removed, the controller enters soft-start. the bootstrap capacitor is charged and regulated to about 5v by the dedicated internal bootstrap regulator. when the voltage between the bst and sw nodes falls below its regulation, a pmos pass transistor connected from v in to bst turns on. the charging current path goes from v in , bst and then to sw. the external circuit must provide enough voltage headroom to facilitate the charging. if v in is sufficiently higher than v sw , the bootstrap capacitor will charge. when the power mosfet is on, v in is equal to v sw so the bootstrap capacitor does not charge. optimal charging occurs when the difference between v in and v sw reaches its apex when the external freewheeling diode is on. when there is no current in the inductor, sw equals v out so the difference between v in and v out can charge the bootstrap capacitor. at a higher duty cycle, the bootstrap capacitor may not be charged sufficiently because of a shorter charging period. if there is insufficient voltage and time to charge the bootstrap capacitor, add an extra external circuit to ensure the bootstrap voltage in normal operation region. the floating driver?s uvlo is not communicated to the controller. make sure the bleed-through current at sw node is at least higher than the floating driver?s dc quiescent current of about 20a. current comparator and current limit a current-sense mosfet senses the power mosfet current. this value is input to the high- speed current comparator for current-mode control. when the power mosfet turns on, the comparator is first blanked to limit noise, and then compares the power switch current against the comp voltage. when the sensed value exceeds the comp voltage, the comparator output goes low to turn off the power mosfet. the maximum current of the internal power mosfet is internally limited cycle-by-cycle. startup and shutdown if both v in and v en exceed their respective thresholds, the chip starts. the reference block first starts to generate a stable reference voltage and current, and then the internal regulator starts to provide a stable supply for the rest circuit. while the internal supply rail is up, an internal timer turns the power mosfet off for about 50s to blank startup noise. when the internal soft- start block is enabled, it first holds its ss output low to ensure the rest of the circuit is ready before ramping up. three events shut down the chip: en low, v in low, thermal shutdown. in shutdown procedure, the signaling path is blocked first to avoid any fault triggering. the comp voltage and the internal supply rail are then pulled low. the floating driver is not subject to this shutdown command but its charging path is disabled.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 11 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. application information component selection setting the output voltage the output voltage is set using a resistive voltage divider from the output voltage to the fb pin. the voltage divider sets v out and v fb using the following equation: 2 r 1 r 2 r v v out fb + = thus the output voltage is: 2 r ) 2 r 1 r ( v v fb out + = the feedback resistor r1 also sets the feedback loop bandwidth with the internal compensation capacitor. choose r1 around 124k ? for optimal transient response. r2 is then given by: out r1 r2 v 1 0.8v = ? table 1: resistor selection vs. output voltage setting v out r1 r2 0.8v 124k ? (1%) ns 1.2v 124k ? (1%) 249k ? (1%) 3.3v 124k ? (1%) 40.2k ? (1%) 5v 124k ? (1%) 23.7k ? (1%) inductor the inductor supplies constant current to the output load while being driven by the switched input voltage. a larger-value inductor will result in less ripple current and lower output ripple voltage. however, the larger-value inductor is typically physically larger, has a higher series resistance, or has a lower saturation current. to determine the inductance, allow the peak-to- peak ripple current in the inductor to be approximately 30% of the maximum load current. also, chose a peak inductor current below the maximum switch current limit. the inductance value can be calculated by: ? ? ? ? ? ? ? ? ? = in out l s out v v 1 i f v 1 l where v out is the output voltage, v in is the input voltage, f s is the switching frequency, and i l is the peak-to-peak inductor ripple current. choose an inductor that will not saturate under the maximum inductor peak current. the peak inductor current can be calculated by: ? ? ? ? ? ? ? ? ? + = in out s out load lp v v 1 1 l f 2 v i i where i load is the load current. table 2 lists a number of suitable inductors from various manufacturers. the choice of which style inductor to use mainly depends on the price vs. size requirements and any emi requirement.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 12 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. table 2: inductor selection guide part number inductance (h) max dcr ( ? ) current rating (a) dimensions l x w x h (mm 3 ) wurth electronics 7440430022 2.2 0.028 2.5 4.8x4.8x2.8 744043003 3.3 0.035 2. 15 4.8x4.8x2.8 7447785004 4.7 0.078 2.4 5.9x6.2x3.2 toko d63cb-#a916cy-2r0m 2. 0 0.019 2.36 6.2x6.3x3.0 d62cb-#a916cy-3r3m 3. 3 0.026 2.17 6.2x6.3x3.0 d62cb-#a916cy-4r7m 4. 7 0.032 2.1 6.2x6.3x3.0 t dk ltf5022t-2r2n3r2 2.2 0.04 3.2 5.2x5.0x2.2 ltf5022t-3r3n2r5 3.3 0.06 2.5 5.2x5.0x2.2 ltf5022t-4r7n2r0 4.7 0.081 2.0 5.2x5.0x2.2 c ooper bussmann sd25-2r2 2.2 0.031 2.8 5.2x5.2x2.5 sd25-3r3 3.3 0.038 2.21 5.2x5.2x2.5 sd25-4r7 4.7 0.047 1.83 5.2x5.2x2.5 the input capacitor (c1) can be electrolytic, tantalum or ceramic. when using electrolytic or tantalum capacitors, add a small, high quality ceramic capacitor?for example, a 0.1 f?as close to the ic as possible. when using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. the input voltage ripple caused by capacitance can be estimated by: ? ? ? ? ? ? ? ? ? = in out in out s load in v v 1 v v 1 c f i v output capacitor the output capacitor (c2) is required to maintain the dc output voltage. ceramic, tantalum, or low esr electrolytic capacitors are recommended. low esr capacitors are preferred to keep the output voltage ripple low. the output voltage ripple can be estimated by: ? ? ? ? ? ? ? ? + ? ? ? ? ? ? ? ? ? = 2 c f 8 1 r v v 1 l f v v s esr in out s out out where l is the inductor value and r esr is the equivalent series resistance (esr) value of the output capacitor. in the case of ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. the output voltage ripple is mainly caused by the capacitance. for simplification, the output voltage ripple can be estimated by: ? ? ? ? ? ? ? ? ? = in out 2 s out out v v 1 2 c l f 8 v v in the case of tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated to: esr in out s out out r v v 1 l f v v ? ? ? ? ? ? ? ? ? = the characteristics of the output capacitor also affect the stability of the regulation system.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 13 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. compensation components the goal of compensation design is to shape the converter transfer function to get a desired loop gain. lower crossover frequencies result in slower line and load transient responses, while higher crossover frequencies can cause system instability. generally, set the crossover frequency to equal approximately one-tenth of the switching frequency. if using an electrolytic capacitor, select a loop bandwidth is no higher than 1/4 of the esr zero frequency (f esr ), where f esr is given by: esr esr r 2 c 2 1 f = the table 3 lists the typical values of compensation components of some standard output voltages with various output capacitors (ceramic) and inductors. the values of the compensation components have been optimized for fast transient responses and good stability under the given conditions. table 3: compensation values for typical v out (v) l (h) c2 (f) r2 (k ? ) c3 (pf) 1.2 2.2 10 249 22 2.5 2.2 10 57.6 22 3.3 2.2 10 40.2 33 5 3.3 10 23.7 33 12 6.2 10 8.87 47 note: with the compensation, the control loop has the bandwidth at about 1/10 switching frequency and the phase margin higher than 45 degree. external bootstrap diode an external bootstrap diode may enhance the efficiency of the regulator. connect an external bst diode from 5v to the bst pin if: z there is a 5v rail available to the system; z v in 5v; z 3.3v < v out < 5v; this diode is also recommended for high-duty? cycle (v out /v in > 65%) applications. a low-cost bootstrap diode, such as in4148 or bat54, is suitable for such applications. MPQ2451 bs sw 5v figure 2: external bootstrap diode at no load or light load, the converter may operate in pulse-skipping mode in order to regulate the output voltage and leave less time to refresh the bst voltage. to ensure sufficient gate voltage, select (v in - v out ) > 3v. for example, if v out is 3.3v, v in needs to be higher than 3.3v+3v=6.3v at no load or light load. to meet this requirement, the en pin can be used to program the input uvlo voltage to v out +3v.
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 14 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. pcb layout pcb layout requires high-frequency noise considerations to limit voltage spikes on the sw node and to limit emi noise. keep the path of the input decoupling capacitor, catch diode, the v in pin, sw pin, and pgnd as short as possible using short and wide traces, with the passive components as close to the device as possible. run the feedback trace far from the inductor and noisy power traces: if possible, run the feedback trace on the opposite side of the pcb from the inductor, separated by a ground plane. expect greater switching losses at high switching frequencies. add a grid of thermal vias under the exposed pad to improve thermal conductivity. use small vias (15mil barrel diameter) so that the hole fills during the plating process, and to avoid solder wicking during the reflow process associated with larger vias. use a pitch (distance between the centers) of approximately 40mil between the thermal vias. please refer to the layout example on evq2451 datasheet. typical application circuits (sot23-6l) vin 3.6v to 36v 3.3v r3 100k MPQ2451 u1 vin en gnd out sw bst 6 1 4 5 3 2 gnd en vout gnd d2 d3 r1 40.2k r2 124k c8 33pf d1 b140 figure 3: low input voltage with bo ost diode application schematic MPQ2451 sw vin en fb gnd bst 1 5 6 3 2 4 c1 c3 c4 100nf d1 v 18-36v 47pf in v out 12v control figure 4: 12v output typical application schematic
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified MPQ2451 rev 1.02 www.monolithicpower.com 15 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. package information sot23-6l
MPQ2451 D industrial-grade 36v, 2mhz, 0.6a, step-down converter, aec-q100 qualified 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. MPQ2451 rev 1.02 www.monolithicpower.com 16 5/3/2013 mps proprietary information. patent protect ed. unauthorized photocopy and duplication prohibited. ? 2013 mps. all rights reserved. qfn6 (2mmx2mm) side view top view 1 6 4 3 bottom view 1.90 2.10 0.65 0.85 1.90 2.10 1.25 1.45 0.65 bsc 0.20 0.30 0.80 1.00 0.00 0.05 0.20 ref pin 1 id marking 0.70 0.65 0.25 recommended land pattern 1.90 pin 1 id see detail a 1.40 0.70 pin 1 id option a 0.30x45o typ. pin 1 id option b r0.20 typ. detail a 0.30 0.40 pin 1 id index area

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