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mpm3515 36v, 1.5a module, synchronous, step-down converter with an integrated inductor aec-q100 qualified mpm3515 rev. 1.0 www.monolithicpower.com 1 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the mpm3515 is a synchronous, rectified, step- down converter with built-in power mosfets, inductors, and capacitors. the mpm3515 offers a very compact solution and requires only four external components to achieve 1.5a of continuous output current with excellent load and line regulation over a wide input supply range. the mpm3515 operates with a 2.2mhz switching frequency to achieve a fast load transient response. full protection features include over-current protection (ocp) and thermal shutdown. the mpm3515 eliminates design and manufacturing risks while improving the time to market dramatically. the mpm3515 is available in a space-saving qfn-17 (3mmx5mmx1.6mm) package. features ? complete switch-mode power supply ? wide 4v to 36v operating input range ? 1.5a continuous load current ? 90m ? /50m ? low r ds(on) internal power mosfets ? fixed 2.2mhz switching frequency ? frequency foldback at a high input voltage ? 450khz to 2.2mhz frequency sync ? forced continuous conduction mode (ccm ) ? power good (pg) indicator ? over-current protection (ocp) with valley- current detection and hiccup ? thermal shutdown ? output adjustable from 0.8v ? available in a qfn-17 (3mmx5mmx1.6mm) package ? cispr25 class 5 compliant ? available in a wettable flank package ? available in aec-q100 grade 1 applications ? industrial controls ? automotive ? medical and imaging equipment ? telecom applications ? distributed power systems a ll mps parts are lead-free, halogen-free, and adhere to the rohs directive. for mps green status, please visi t the mps website under quality a ssurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mpm3515 in en/sync pgnd fb vin en/ sync r1 75k ? r2 24.3k ? c2 47f c1 4.7f 3.3v/1.5a 4v-36v vout agnd out
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 2 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number package top marking mpm3515gqv * qfn-17 (3mmx5mmx1.6mm) see below MPM3515GQV-AEC1 ** mpm3515gqve-aec1 *** * for tape & reel, add suffix ?z (e.g. mpm3515gqv?z) ** under qualification. *** under qualification, wettable flank. top marking (mpm3515gqv & MPM3515GQV-AEC1) mp: mps prefix y: year code w: week code 3515: first four digits of the part number lll: lot number m: module top marking (mpm 3515gqve-aec1) mp: mps prefix: y: year code; w: week code: 3515: first four digits of the part number; lll: lot number; e: wettable lead flank m: module
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 3 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package reference top view qfn-17 (3mmx5mmx1.6mm) absolute maxi mum ratings (1) v in ................................................... -0.3v to 40v v sw , v out ............................... -0.3v to v in + 0.3v v bst ...................................................... v sw + 6v all other pins ................................ -0.3v to 6v (2) continuous power dissipation (t a = +25c) (3) ................................................................... 2.7w junction temperature ................................ 150c lead temperature ..................................... 260c storage temperature .................. -65c to 150c recommended operating conditions supply voltage (v in ) ............................ 4v to 36v output voltage (v out ) ................ 0.8v to v in *d max operating junction temp. (t j ). .. -40c to +125c thermal resistance (4) ja jc qfn-17 (3mmx5mmx1.6mm)...46 ..... 10 ... c/w notes: 1) exceeding these ratings may damage the device. 2) for details on en/sync?s abs max rating, please refer to the en/sync section on page 13. 3) the maximum allowable powe r dissipation is a function o f 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 produces an excessive die temperature, causing the regulator to go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 4) measured on jesd51-7, 4-layer pcb.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 4 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics v in = 12v, t j = -40c to +125c, unless otherwise noted. typical values are at t j = +25c. parameter symbol condition min typ max units supply current (shutdown) i in v en/sync = 0v 8 a supply current (quiescent) i q v en/sync = 2v , v fb = 1v, no switching 0.6 0.8 ma hs switch on resistance hs rds ( on ) v bst-sw = 5v 90 155 m ? ls switch on resistance ls rds ( on ) v cc = 5v 50 105 m ? inductor dc resistance l dcr 75 m ? switch leakage sw lkg v en/sync = 0v, v sw = 12v 1 a current limit ( 5 ) i limit 20% duty cycle 2.4 4.0 5.5 a low-side valley current limit 1.5 2.5 3.5 a reverse current limit 1.2 a oscillator frequency f sw v fb = 700mv 1800 2200 2600 khz foldback frequency during soft start (5) f fb v fb = 200mv 0.2 f sw maximum duty cycle d max v fb = 700mv 85 % minimum on time (5) t on min 40 ns feedback voltage v fb t a = 25c 795 807 819 mv t a = -40c to 125c 790 807 824 mv feedback current i fb v fb = 820mv 10 50 na en/sync rising threshold v en_rising 1.2 1.45 1.7 v en/sync falling threshold v en_falling 0.8 1 1.3 v en/sync input current i en v en/sync = 2v 5 10 a en/sync turn off delay en td_off 3 s en/sync frequency range 450 2200 khz v in under-voltage lockout threshold rising inuv vth 3 3.5 3.8 v v in under-voltage lockout threshold hysteresis inuv hys 330 mv pg rising threshold pg vth hi 0.83 0.88 0.93 v fb pg falling threshold pg vth lo 0.78 0.83 0.88 v fb pg rising delay pg td rising 40 90 160 s pg falling delay pg td falling 30 55 95 s pg sink current capability v pg sink 4ma 0.4 v pg leakage current i pg leak 100 na vcc regulator v cc 4.5 4.8 5.1 v vcc load regulation i cc = 5ma 1.5 4 % soft-start time t ss v out from 10% to 90% 0.5 1.7 3 ms thermal shutdown ( 5 ) 170 c thermal hysteresis ( 5 ) 20 c note: 5) not tested in production and guaranteed by over-temperature correlation.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 5 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 6 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued)
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 7 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued)
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 8 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 12v, v out = 3.3v, i out = 1.5a, l = 2.2 h, f sw = 2.2mhz, with emi filters, t a = +25c, unless otherwise noted. (6) cispr25 class 5 peak radiated emissions cispr25 class 5 average radiated emissions (150khz - 30mhz) (150khz - 30mhz) -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0.15 5.15 10.15 15.15 20.15 25.15 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0.15 5.15 10.15 15.15 20.15 25.15 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg cispr25 class 5 peak radiated emissions cispr25 class 5 average radiated emissions (vertical, 30mhz - 1ghz) (vertical, 30mhz - 1ghz) -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0 100 200 300 400 500 600 700 800 900 1000 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0 100 200 300 400 500 600 700 800 900 1000 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg cispr25 class 5 peak radiated emissions cispr25 class 5 average radiated emissions (horizontal, 30mhz - 1ghz) (horizontal, 30mhz - 1ghz) -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0 100 200 300 400 500 600 700 800 900 1000 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 0 100 200 300 400 500 600 700 800 900 1000 frequency (mhz) amplitude (dbuv/m) data class 5 peak class 5 avg note: 6) the emc test results are based on the applicat ion circuit with emi filters (see figure 12).
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 9 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in 5v/div. i l 500ma/div. v out 1v/div. pg 5v/div. sw 5v/div. v in 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 5v/div. v in 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 5v/div. v en 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 5v/div. v en 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 10v/div. v en 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 5v/div. v in 5v/div. i l 1a/div. v out 2v/div. pg 5v/div. sw 5v/div. v en 5v/div. i l 1a/div. v out 1v/div. pg 5v/div. sw 10v/div. v in 5v/div. i l 2a/div. v out 2v/div. pg 5v/div. sw 10v/div.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 10 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued)
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 11 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions package pin # name description 1 pg power good indicator. pg is an open-drain structure. 2 en/sync enable/sync. pull en/sync high to enable t he mpm3515. float en/sync or connect en/sync to ground to disable the mpm3515. apply an external clock to en/sync to change the switching frequency. 3 fb feedback. connect fb to the tap of an external resistor divider from the output to agnd to set the output voltage. the frequ ency foldback comparator lowers the oscillator frequency when the fb voltage is below 400mv to prevent current-limit runaway during a short-circuit fault. place t he resistor divider as close to fb as possible. avoid placing vias on the fb traces. 4 vcc internal 4.8v ldo output. since an internal circuit integrates the ldo output capacitor, there is no need to add an external capacitor. 5 agnd analog ground. reference ground of the logic circuit. agnd is connected to pgnd internally. there is no need to add external connections to pgnd. 6, 7, 8, 12 sw switch output. there is no need to connect these sw pins, but a large copper plane is recommended on pins 6, 7, and 8 for better heat sinking. 9, 10, 11 out power output. connect the load to out. an output capacitor is required. 13, bst bootstrap. the bootstrap capacitor is integrated internally. there is no need for external connections. 14,15 pgnd power ground. pgnd is the reference ground of the power device and requires careful consideration during pcb layout. for best results, connect pgnd with copper pours and vias. 16 in supply voltage. in supplies power for the internal mosfet and regulator. the mpm3515 operates from a +4v to +36v input rail. a low-esr and low-inductance capacitor is required to decouple the input rail. place the input capacitor very close to in and connect it with wide pcb traces and multiple vias. 17 nc do not connect. nc must be left floating.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 12 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram figure 1: functional block diagram
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 13 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mpm3515 is a high-frequency, synchronous, rectified, step-down, switch-mode converter with built-in power mosfets, an integrated inductor, and two capacitors. the mpm3515 offers a very compact solution that achieves 1.5a of continuous output current with excellent load and line regulation over a 4v to 36v input supply range. the mpm3515 operates in a fixed-frequency, peak-current-control mode to regulate the output voltage. an internal clock initiates a pwm cycle. the integrated high-side power mosfet (hs-fet) turns on and remains on until the current reaches the value set by the comp voltage (v comp ). when the power switch is off, it remains off until the next clock cycle begins. if the current in the power mosfet does not reach the value set by v comp within 85% of one pwm period, the power mosfet is forced off. internal regulator a 4.8v internal regulator powers most of the internal circuitries. this regulator takes v in and operates in the full v in range. when v in is higher than 4.8v, the output of the regulator is in full regulation. when v in is lower than 4.8v, the output decreases. the mpm3515 integrates an internal decoupling capacitor, so there is no need to add an external vcc output capacitor. ccm operation the mpm3515 uses continuous conduction mode (ccm) to ensure that the part works with a fixed frequency from a no-load to a full-load range. the advantage of ccm is the controllable frequency and lower output ripple at light load. frequency foldback the mpm3515 enters frequency foldback when the input voltage is higher than about 21v. the frequency decreases to half the nominal value and changes to 1.1mhz. frequency foldback also occurs during soft start and short-circuit protection. error amplifier (ea) the error amplifier compares the fb voltage to the internal 0.807v reference (v ref ) and outputs a current proportional to the difference between the two. this output current then charges or discharges the internal compensation network to form v comp , which controls the power mosfet current. the optimized internal compensation network minimizes the external component count and simplifies the control loop design. under-voltage lockout (uvlo) under-voltage lockout (uvlo) protects the chip from operating at an insufficient supply voltage. the uvlo comparator monitors the output voltage of the internal regulator (vcc). the uvlo rising threshold is about 3.5v, while its falling threshold is 3.17v. enable/sync en/sync is a control pin that turns the regulator on and off. drive en/sync high to turn on the regulator; drive en/sync low to turn off the regulator. an internal 500k ? resistor from en/sync to gnd allows en/sync to be floated to shut down the chip. en/sync is clamped internally using a 6.5v series zener diode (see figure 2). connecting the en/sync input through a pull-up resistor to the voltage on v in limits the en/sync input current below 100a. for example, with 12v connected to v in , r pullup (12v - 6.5v) 100a = 55k ? . connecting en/sync to a voltage source directly without a pull-up resistor requires limiting the amplitude of the voltage source to 6v to prevent damage to the zener diode. en/sync en/sync figure 2: 6.5v zener diode connection connect an external clock with a range of 450khz to 2.2mhz to synchronize the internal clock rising edge to the external clock rising edge. the pulse wide of the external clock
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 14 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. signal should be below 350ns, and the off time of external clock signal should be below 1.9s. internal soft start (ss) the soft start (ss) prevents the converter output voltage from overshooting during start- up. when the chip starts up, the internal circuitry generates a soft-start (ss) voltage that ramps up from 0v to 4.8v. when ss is lower than ref, the error amplifier uses ss as the reference. when ss is higher than ref, the error amplifier uses ref as the reference. the ss time is set to 1.7ms internally. over-current protection (ocp) and hiccup the mpm3515 has cycle-by-cycle peak-current- limit protection and valley-current detection protection. the inductor current is monitored during the hs-fet on-state. if the inductor current exceeds the current-limit value set by the comp high-clamp voltage, the hs-fet turns off immediately. the low-side mosfet (ls-fet) then turns on to discharge the energy, and the inductor current decreases. the hs- fet remains off unless the inductor valley current is lower than a certain current threshold (the valley current limit), even though the internal clock pulses high. if the inductor current does not drop below the valley current limit when the internal clock pulses high, the hs- fet misses the clock, and the switching frequency decreases to half the nominal value. both the peak and valley current limits assist in keeping the inductor current from running away during an overload or short-circuit condition. if the output voltage drops below the under- voltage (uv) threshold (typically 50% below the reference), the mpm3515 enters hiccup mode to restart the part periodically. simultaneously, the peak-current limit is reached. this protection mode is useful when the output is dead-shorted to ground and reduces the average short-circuit current greatly to alleviate thermal issues and protect the regulator. the mpm3515 exits hiccup mode once the over- current condition is removed. thermal shutdown thermal shutdown prevents the chip from operating at exceedingly high temperatures. when the die temperatures exceed 170c, the device stops switching. when the temperature drops below its lower threshold (typically 150c), the power supply resumes operation. floating driver and bootstrap charging an internal bootstrap capacitor powers the floating power mosfet driver. a dedicated internal regulator charges and regulates the bootstrap capacitor voltage to ~4.8v (see figure 3). when the voltage between the bst and sw nodes drops below the regulation voltage, a pmos pass transistor connected from v in to bst turns on. the charging current path is from v in to bst to sw. the external circuit should provide enough voltage headroom to facilitate charging. as long as v in is higher than sw significantly, the bootstrap capacitor remains charged. when the hs-fet is on, v in v sw , so the bootstrap capacitor cannot charge. when the ls-fet is on, v in - v sw reaches its maximum for fast charging. when there is no inductor current, v sw is equal to v out , so the difference between v in and v out can charge the bootstrap capacitor. the floating driver has its own uvlo protection with a rising threshold of 2.2v and hysteresis of 150mv. figure 3: internal bootstrap charging circuit start-up and shutdown if v in exceeds its thresholds, the mpm3515 starts up. the reference block starts first, generating a stable reference voltage and current. the internal regulator is then enabled. the regulator provides a stable supply for the remaining circuitries. three events can shut down the chip: v in low, en/sync low, and thermal shutdown. during the shutdown procedure, the signaling path is first blocked to avoid any fault triggering. v comp and the internal supply rail are then pulled down. the floating driver is not subject to this shutdown command.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 15 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information setting the output voltage the external resistor divider sets the output voltage (see the typical application on page 1). the feedback resistor (r1) sets the feedback loop bandwidth with the internal compensation capacitor. choose r1 to be around 75k ? when v out ? 1v. r2 can then be calculated with equation (1): 1 0.807v v r1 r2 out ? ? (1) figure 4 shows the feedback network. fb r1 r2 c3 v out figure 4: feedback network table 1 lists recommended resistor values for common output voltages. table 1: resistor selection for common output voltages v out (v) r1 (k ? ) r2 (k ? ) 1.5 75 87 1.8 75 61 2.5 75 35.7 3.3 75 24.3 5 75 14.3 selecting the input capacitor the input current to the step-down converter is discontinuous and therefore requires a capacitor to supply ac current to the converter while maintaining the dc input voltage. for the best performance, use low esr capacitors. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, use a 4.7f capacitor. since c1 absorbs the input switching current, it requires an adequate ripple current rating. the rms current in the input capacitor can be estimated with equation (2): ? ? ? ? ? ? ? ? ? ? in out in out load c1 v v 1 x v v x i i (2) the worst-case condition occurs at v in = 2v out , shown in equation (3): 2 i i load c1 ? (3) for simplification, choose an input capacitor with an rms current rating greater than half of the maximum load current. the input capacitor can be electrolytic, tantalum, or ceramic. when using electrolytic or tantalum capacitors, add a small, high-quality ceramic capacitor (e.g.: 0.1 f) as close to the ic as possible. when using ceramic capacitors, ensure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. the input voltage ripple caused by the capacitance can be estimated with equation (4): load out out in sin in iv v ? vxx1 fxc1 v v ?? ?? ?? ?? (4) selecting the output capacitor the output capacitor (c2) maintains the dc output voltage. use ceramic, tantalum, or low- esr electrolytic capacitors. for best results, use low esr capacitors to keep the output voltage ripple low. the output voltage ripple can be estimated with equation (5): ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? xc2 8xf 1 r x v v 1 x xl f v ? v s esr in out 1 s out out (5) where l 1 is the inductor value and r esr is the equivalent series resistance (esr) value of the output capacitor. for ceramic capacitors, the capacitance dominates the impedance at the switching frequency, and the capacitance causes the majority of the output voltage ripple.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 16 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. for simplification, the output voltage ripple can be estimated with equation (6): ? ? ? ? ? ? ? ? ? ? in out 1 2 s out v v 1 x xc2 xl 8xf 1 ? v (6) for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated with equation (7): esr in out 1 s out out xr v v 1 x xl f v ? v ? ? ? ? ? ? ? ? ? ? (7) the characteristics of the output capacitor also affect the stability of the regulation system. the mpm3515 can be optimized for a wide range of capacitance and esr values. external bootstrap diode an external bootstrap diode can enhance the efficiency of the regulator given the following conditions: ? v out is 5v or 3.3v ? duty cycle is high: d = in out v v > 65% in these cases, add an external bst diode from vcc to bst (see figure 5). figure 5: optional external bootstrap diode added to enhance efficiency the recommended external bst diode is in4148. pcb layout guidelines (7) efficient pcb layout, especially of the input capacitor placement, is critical for stable operation. for best results, refer to figure 6 and follow the guidelines below. 1. connect a large ground plane to pgnd directly. if the bottom layer is a ground plane, add vias near pgnd. 2. ensure that the high-current paths at gnd and in have short, direct, and wide traces. 3. place the ceramic input capacitor close to in and pgnd. 4. keep the connection of the input capacitor and in as short and wide as possible. 5. place the external feedback resistors next to fb. 6. keep the feedback network away from the switching node. note: 7) the recommended layout is based on figure 8. r2 r1 c2 r3 in top layer bottom layer figure 6: recommended pcb layout
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 17 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. design example table 2 is a design example following the application guidelines for the specifications below. table 2: design example v in 12v v out 3.3v i out 1.5a the typical performance and circuit waveforms are shown in the typical performance characteristics section. for more device applications, please refer to the related evaluation board datasheet.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 18 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits figure 7: v out = 5v, i out = 1.5a figure 8: v out = 3.3v, i out = 1.5a
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 19 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits (continued) figure 9: v out = 2.5v, i out = 1.5a figure 10: v out = 1.8v, i out = 1.5a
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 20 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits (continued) figure 11: v out = 1.5v, i out = 1.5a mpm 3515 in en/ sync vcc pg pgnd fb sw bst r1 75 k r2 24.3k c2 3.3v/1.5a vout agnd out r3 100 k r4 100 k pg 16 2 4 1 13 514,15 6,7,8,12 9,10.11 3 c1 4.7f c3 en / sync vin vemi gnd 1206 fb1 2.2uh l1 4v-36v c in 1 1 nf c in 2 10nf c in 3 1 uf c in 4 10uf c in 5 10uf 0.1f l2 150nh 47f c4 1n f figure 12: v out = 3.3v, i out = 1.5a with emi filter
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter mpm3515 rev. 1.0 www.monolithicpower.com 21 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information qfn-17 (3mmx5mmx1.6mm) non-wettable flank 1) all dimensions are in millimeters. 2) shaded area is the keep-out zone. any pcb metal trace and via are not allowed to connect to this area electrically or mechanically. 3) lead coplanarity shall be 0.10 millimeters max. 4) jedec reference is mo-220. 5) drawing is not to scale.
mpm3515 ? 36v, 1.5a, synchronous, step-down, module converter 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. mpm3515 rev. 1.0 www.monolithicpower.com 22 8/22/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information (continued) qfn-17 (3mmx5mmx1.6mm) wettable flank 1) all dimensions are in millimeters. 2) shaded area is the keep-out zone. any pcb metal trace and via are not allowed to connect to this area electrically or mechanically. 3) the lead side is wettable. 4) lead coplanarity shall be 0.10 millimeters max. 5) jedec reference is mo-220. 6) drawing is not to scale.

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