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MP3415 3.6a, 1mhz, synchronous, step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 1 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the MP3415 is a high-efficiency, synchronous, current-mode, step-up converter with output disconnect. the MP3415 can start up with an input voltage as low as 1.8v while providing inrush current limiting and output short-circuit protection (scp). the integrated, p-channel, synchronous rectifier improves efficiency and eliminates the need for an external schottky diode. the p- channel mosfet disconnects the output from the input when the MP3415 shuts down. output disconnect discharges the output completely, allowing the MP3415 to draw a supply current below 1 a in shutdown mode. the 1mhz switching frequency allows small external components while internal compensation and soft start minimize the external component count, making the MP3415 a compact solution for a wide current load range. the MP3415 features an integrated power mosfet that supports an output up to 5.5v and a peak switching current above 3.6a. the MP3415 is available in a small qfn-12 (2mmx2mm) package. features ? 1.8v to 5.5v input voltage range ? output voltage up to 5.5v ? supports 5v/1.5a at 2.8v input ? internal synchronous rectifier ? 1mhz fixed switching frequency ? 22 a quiescent current ? <1 a shutdown current ? true output disconnect from the input ? efficiency up to 97% ? internal compensation, inrush current limiting, and internal soft start ? small external components ? protection features include ovp, scp, and otp ? small qfn-12 (2mmx2mm) package applications ? two-cell and three-cell alkaline, nicd or nimh, or single-cell li battery consumer products ? personal medical devices ? portable media players ? wireless peripherals ? gaming accessories a ll mps parts are lead-free, halogen-free, and adhere to the rohs directive. fo r mps green status, please visit the mps website under quality assurance. ?mps? and ?the future of analog ic technology? are registered trademarks o f monolithic power systems, inc. typical application MP3415 sw 1.5 h out in pgnd fb en r1 1m c2 22 f vout c1 10 f agnd vin on off r2 137k 1 c3 l1 r4 1nf efficiency vs. load current v out =5v load current(a) 50 60 70 80 90 100 0 0.3 0.6 0.9 1.2 1.5 v in =4.2v v in =3.3v v in =2.8v
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 2 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking MP3415gg qfn-12 (2mmx2mm) see below * for tape & reel, add suffix ?z (e.g. MP3415gg?z) top marking ea: product code of MP3415gg y: year code lll: lot number package reference top view qfn-12 (2mmx2mm)
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 3 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. absolute maximum ratings (1) sw, out .................................... -0.3v to +6.5v sw (<5ns) ................................... -0.3v to +9.5v all other pins ................................ -0.3v to +6.5v continuous power dissipation (t a = +25c) (2) ................................................................. 1.56w junction temperature ................................ 150c lead temperature ..................................... 260c storage temperature ................ -65 ? c to +150c recommended operating conditions (3) supply voltage (v in ) ........................ 1.8v to 5.5v v out ............................. v in-max x 110% to 5.5v (4) operating junction temp. (t j )....-40c to +125c thermal resistance (5) ja jc qfn-12 (2mmx2mm) ............... 80 ..... 16 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power 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. 3) the device is not guaranteed to function outside of its operating conditions. 4 ) if v in is close to v out , the boost converter may trigger the minimum on time. when v in is higher than v out , the boost converter switches between boost mode and linear charge mode. both conditions result in a v out-ripple that is too high and are therefore not recommended. 5) measured on jesd51-7, 4-layer pcb.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 4 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics v in = v en = 3.3v, v out = 5v, t j = -40c to 125c. typical value is tested at t j = 25c, unless otherwise noted. parameters symbol condition min typ max units voltage range quiescent current i q v en = v in = 3.3v, v out = 5v, no load, v fb = 0.65v, measured on out, t j = 25c 22 30 a v en = v in = 3.3v, v out = 5v, no load, v fb = 0.65v, measured on in, t j = 25c 8 12 a shutdown current i sd v en = v out = 0v, measured on in, t j = 25c 0.1 1 a in under-voltage lockout v in uvlo v in rising, t j = 25c 1.65 1.7 v in under-voltage lockout hysteresis 100 mv step-up converter operation frequency f sw 0.8 1.0 1.2 mhz feedback voltage reference v fb t j = 25c 594 600 606 mv t j = -40c to 125c 591 600 609 mv feedback input current i fb v fb = 0.63v 1 50 na nmos on resistance r nds on 70 m ? nmos leakage current i nlk v sw = 6.5v, t j = 25c 0.1 1 a pmos on resistance r pds on 90 m ? pmos leakage current i plk v sw = 6.5v, v out = 0v, t j = 25c 0.1 1 a maximum duty cycle d max 85 95 % start-up current limit i st_limit v in = 4v, v out = 0v 0.3 a v in = 4v, v out-setting = 3.6v, pull v out to 3.3v 0.8 a nmos current limit i sw limit duty = 40% 3.6 4.2 5 a logic interface en input high-level voltage v en h 1.2 v en input low-level voltage v en l 0.4 v en input current i en connect to v in 10 na protection thermal shutdown (6) 155 c over-temperature hysteresis (6) 25 c note: 6) guaranteed by characterization, not tested in production.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 5 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics v in = 3.3v, v out = 5v, l = 1.5h, t a = 25c, unless otherwise noted. 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 0 0.2 0.4 0.6 0.8 1 012345 3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 0 1020304050607080 0 0.2 0.4 0.6 0.8 1 3 3.5 4 4.5 5 595 597 599 601 603 605 800 850 900 950 1000 1050 1100 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 -50 -25 0 25 50 75 100 125 150 rising falling falling rising 0 2 4 6 8 10 123456
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 6 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5h, t a = 25c, unless otherwise noted. 123456 10 12 14 16 18 20 22 24
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 7 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5h, t a = 25c, unless otherwise noted. efficiency vs. load current v out =5v load current(a) efficiency vs. load current v out =3.3v load current(a) load regulation v out =5v load current(a) line regulation v out =5v input voltage (v) case temperature rise vs. load current v out =5v input voltage (v) phase margin (deg) gain(db) frequency(khz) bode plot v in =3.3v, v out =5v, i out =1.5a -60 -40 -20 0 20 40 60 1 10 100 1000 -180 -120 -60 0 60 120 180 load capability vs. input voltage (7) v out =5v 0 0.5 1 1.5 2 2.5 3 1.5 2 2.5 3 3.5 4 4.5 5 max load current (a) load current(a) 50 60 70 80 90 100 50 60 70 80 90 100 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 v in =4.2v v in =3.3v v in =2.8v v in =1.8v v in =2.5v v in =3v -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 0 0.25 0.5 0.75 1 1.25 1.5 1.75 v in =4.2v v in =2.8v v in =3.3v -1 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1 1.5 2.5 3.5 4.5 5.5 i out =0a i out =0.75a i out =1.5a phase gain 0 10 20 30 40 50 0 0.5 1 1.5 2 v in =3v v in =3.3v v in =4.2v note: 7) tested with a 3.6a inductor peak current with the schematic shown in figure 3. the maximum load current may decrease if the temperature rising is limited on the real application board.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 8 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5h, t a = 25c, unless otherwise noted. steady state i out = 0a steady state i out = 1.5a v in start-up i out = 0a v sw 5v/div. v out 2v/div. v en 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v en 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v en 2v/div. i l 1a/div. i l 1a/div. v sw 5v/div. v in 2v/div. v out /ac 50mv/div. i l 1a/div. v sw 5v/div. v in 2v/div. v out /ac 50mv/div. i l 2a/div. v sw 5v/div. v out 2v/div. v in 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v in 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v in 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v in 2v/div. v in shutdown i out = 0a en start-up i out = 0a en shutdown i out = 0a
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 9 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5h, t a = 25c, unless otherwise noted. v sw 5v/div. v out 2v/div. v en 2v/div. v sw 5v/div. v in 2v/div. v out 2v/div. v out /ac 500mv/div. v sw 5v/div. v in 2v/div. v out 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v in 2v/div. i l 1a/div. v sw 5v/div. v out 2v/div. v in 2v/div. i out 500ma/div. v out /ac 500mv/div. i out 500ma/div.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 10 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions pin # name description 1, 10 pgnd power ground. 2, 11 sw power switch output. sw is the connection node of the internal low-side mosfet and synchronous mosfet. connect the power i nductor between sw and the input power. keep the pcb trace length as short and wide as possible to reduce emi and voltage spikes. 3, 12 out output. out is the drain of the internal sync hronous rectifier mosfet. bias power is derived from out once v out exceeds v in . pcb trace length from out to the output filter capacitor(s) should be as short and wide as po ssible. the output disconnect feature allows out to be completely disconnected from in when en is low. 4 in power supply input. the start-up bias is derived fr om in and must be bypassed locally. the bias power is derived from out once v out exceeds v in . 5 n/c no connection. 6 en chip enable control input. set en higher than 1.2v to turn on the regulator. set en lower than 0.4v to turn off the regulator. 7 fb feedback. connect fb to the tap of an external re sistive voltage divider from the output to set the output voltage. 8 agnd analog ground. 9 trim test pin for factory use only. connect trim to gnd during application.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 11 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram driver and control logic + - current sense amplifier oscillator sw out agnd ea fb en bias and voltage ref 0.6v slope comp pwm comp start -up mode control vin body control vdd in enable + - + - + v max soft start out ovp clamp s thermal control + - current sense pgnd pgnd hs ls l1 vin on off pgnd vout pgnd c2 r1 r2 c1 pgnd current limit figure 1: functional block diagram
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 12 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the MP3415 is a 1mhz, synchronous, step-up converter with true output disconnect. the device features a fixed-frequency, current- mode, pwm control for ideal line and load regulation. the internal soft start and loop compensation simplify the design process and minimize external components. the internal low-r ds(on) mosfets combined with frequency stretching allow the MP3415 to achieve high efficiency over a wide load range. start-up when enabled, the MP3415 starts up in linear charge mode. during the linear charge, the rectified p-channel mosfet (pmos) turns on until the output voltage (v out ) is charged close to the input voltage (v in ). to prevent inrush current, the pmos current is limited to about 0.3a when v out is 0v. the pmos linear charge current limit is increased to about 0.8a while v out rises to 3.3v (if v in is higher than 3.3v). this circuit helps to limit the output current under short-circuit conditions. once the output voltage reaches v in, the linear charging period elapses, and the device begins switching. v out begins rising under internal soft-start (ss) control. in boost switching condition, the current limit is 4.2a, typically. when v out is higher than v in , the MP3415 powers its internal circuits from v out instead of v in . this allows for strong driving capability and high efficiency, even if v in drops to as low as 1.8v. soft start (ss) the MP3415 provides a soft start (ss) by charging an internal capacitor with a current source. during the linear charge period, the ss signal continues rising, following fb. once the linear charge elapses, the voltage on the ss capacitor is charged and ramps up to the reference voltage based on the internal fixed slew rate. the ss capacitor is discharged completely during a forced shutdown, thermal shutdown, or output short circuit. device enable (en) the device begins operating if en is higher than 1.2v and enters shutdown mode if en is lower than 0.4v. in shutdown mode, all internal control circuits switch off, and the output disconnects from the input completely. power-save mode (psm) the MP3415 enters power-save mode (psm) automatically when the load decreases and switches back to pwm mode when the load increases. in psm, the converter stretches the frequency down to reduce switching and driver loss. the switch frequency is also stretched down when the input voltage is close to the output voltage, which triggers the minimum on time if kept at a 1mhz frequency. this helps decrease the output ripple by avoiding group pulse mode. under very light-load conditions, the MP3415 runs in group-pulse mode to regulate the output voltage and save more power. error amplifier (ea) the error amplifier (ea) is an internally compensated amplifier. the ea compares the internal 0.6v reference voltage against v fb to generate an ea signal, which controls v out . the output voltage of the MP3415 is adjusted via fb by an external resistor divider and can be calculated with equation (1): out r1 v0.6v(1) r2 ??? (1) setting a high value for r1 and r2 can achieve a low quiescent current. however, a resistance that is too high is sensitive to noise and leads to a low loop bandwidth. set the r1 value between 499k ? and 1m ? for good leakage, stability, and transient balance.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 13 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. current sensing in a linear charge condition, the high-side, p- channel mosfet current is sensed and compared with the current limit threshold. the compared output manages the linear charge current. in boost switching condition, lossless current sensing converts the n-channel mosfet switch current signal to a voltage that is summed with the internal slope compensation. the summed signal is compared with the ea output to provide a peak-current control command for pwm. the peak switch current is limited to approximately 4.2a. the switch- current signal is blanked internally for 60ns to enhance noise immunity. output disconnect the MP3415 is designed to allow for true output disconnect by eliminating body diode conduction of the internal p-channel mosfet rectifier. this allows v out to reach 0v during shutdown, drawing zero current from the input source. this also allows for inrush current limiting at start-up, which minimizes the surge current seen by the input supply. to obtain the advantages of the output disconnect, there cannot be an external schottky diode connected between sw and vout. overload (olp) and short-circuit (scp) protections when an overload or a short circuit occurs, the output voltage drops. if v out drops below v in - 0.3v, the MP3415 stops for about 50s and then runs in a linear charge mode. if the overload or short circuit is removed, the MP3415 restarts under ss control automatically. over-voltage protection (ovp) if v out is higher than the typical 6v threshold, the boost switching stops. after the output drops to about 5.7v, the switching recovers automatically. this protects the internal power mosfet from over-voltage stress. thermal shutdown (tsd) the device has an internal temperature monitor. if the die temperature exceeds 155c, the converter turns off. once the temperature drops below 130c, the converter restarts.
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 14 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information selecting the input capacitor low equivalent series resistance (esr) input capacitors reduce input switching noise and peak current drawn from the input power. ceramic capacitors are recommended for input decoupling and should be placed as close to the device as possible. use a ceramic capacitor larger than 10 f to limit the v in ripple. output capacitor selection to ensure stability over the full operating range, the output capacitor requires a minimum capacitance value of 22 f at the programmed output voltage. a higher capacitance value may be required to lower the output and transient ripple. x5r or x7r capacitors are recommended for their low esr values. supposing the esr is zero, calculate the minimum output capacitor value needed to support the ripple in pwm mode with equation (2): o out(max) in(min) o sout(max) i(v v ) c fv ? v ?? ? ?? (2) where v out(max) is the maximum output voltage, v in(min) is the minimum input voltage, i o is the output current, f s is the switching frequency, and ? v is the acceptable output ripple. a 1 f ceramic capacitor is recommended to be placed between v out and pgnd with a short loop to reduce spikes on the sw node and improve emi performance. selecting the inductor the MP3415 utilizes small, surface-mounted chip inductors for their 1mhz switching frequencies. inductor values between 1 h and 2.2 h are suitable for most applications. inductors with larger values allow for slightly greater output current capabilities by reducing the inductor ripple current. however, a larger inductance value increases component size. the minimum inductance value can be calculated with equation (3): in(min) out(max) in(min) out(max) l s v(v v) l vif ? ? ? ?? ? (3) where ? i l is the acceptable inductor current ripple. typically, the inductor current ripple is set to 30% to 50% of the maximum inductor current. maintain a low series resistance of the inductor (dcr) to reduce resistive power loss. the saturated current (i sat ) should be large enough to support the peak current. sw rc snubber when the MP3415 is used to generate an output of 4v or higher, an rc snubber should be added to protect the internal mosfet from over-voltage caused by the sw spike. the recommended rc snubber parameters are 1 ? and 1nf (see figure 3).
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 15 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pcb layout guidelines efficient pcb layout is critical for high- frequency switching power supplies. poor layout can result in reduced performance, excessive emi, resistive loss, system instability, and even over-voltage stress. for best results, refer to figure 2 and follow the guidelines below: 1. place the output capacitor as close to out as possible with minimal distance to pgnd. 2. place a small decoupling capacitor in parallel with the bulk output capacitor and with smaller loop than bulk output capacitor. this is very important for reducing spikes on sw and improving emi performance. 3. place the input capacitor and inductor as close to in and sw as possible. 4. keep the trace between the inductor and sw as wide and short as possible. 5. keep the feedback loop far away from all noise sources, such as sw. 6. place the feedback divider resistors as close to fb and agnd as possible. 7. tie the ground return of the input/output capacitors as close to pgnd as possible. 8. use a large copper gnd area. vias around gnd are recommended to lower the die temperature. 9. add an rc snubber circuit from sw to pgnd to reduce the sw spike when the output is higher than 4v. see figure 2 for layout recommendations. c1 l1 c2a c2b r1 r2 r3 r4 c3 u1 top layer bottom layer via figure 2: layout recommendation design example table 1 shows a design example following the application guidelines for the following specifications: table 1: design example v in 2.8v - 4.5v v out 5v i out 0a - 1.5a the typical application circuit in figure 3 is for 5v v out . it shows the detailed application schematic and the basis for the typical performance waveforms. for additional detailed device applications, please refer to the related evaluation board datasheet (evb).
MP3415?3.6a, 1mhz step-up converter with output disconnect MP3415 rev. 1.0 www.monolithicpower.com 16 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits pgnd figure 3: typical boost application circuit, v in = 2.8v to 4.5 v, v out = 5v, i out = 0a - 1.5a 220k r2 1m r1 22 f c2a gnd gnd 100k r3 gnd 1.5 h l1 1 f c2b gnd gnd 10 f c1 in en fb out agnd pgnd sw u1 vin vout MP3415 figure 4: typical boost application circuit, v in = 1.8v to 3v, v out = 3.3v, i out = 0a - 1.5a (8) 8) tested with a 3.6a inductor peak current with the schematic s hown in figure 4. the maximum load current may decrease if vin drops to lower than 2.1v.
MP3415?3.6a, 1mhz step-up converter with output disconnect notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP3415 rev. 1.0 www.monolithicpower.com 17 3/29/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information qfn-12 (2mmx2mm)

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