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mpm3606a 21v/ 0.6 a dc/dc module synchronous step - down converter with integrated inductor description the mpm3606a is a synchronous rectified , step - down m odule converter with built - in power mosfets , inductor , and two capacitors . it offers a compact solution that requires only 5 external components to achieve a 0.6a continuous output cur rent with excellent load and line regulation over a wide inpu t - supply range . also, it provides fast load transient response. full protection features include over - current protection (ocp) and thermal shut down (tsd) . mpm3606a eliminates design and manufacturing risks while dramatically improving time - to - market. the mpm3606a is available in a space - saving qfn 20 ( 3mmx5mmx1. 6 mm ) package . features ? 4.5 v - to - 2 1 v operating input range ? 0.6a continuous load current ? 100m / 5 0m low r ds(on) interna l power mosfets ? integrated inductor ? integrated v cc and bootstrap capacitors ? power - save mode at light load ? power good indicator ? o ver - current protection and hiccup ? thermal shutdown ? output adjustable from 0.8v ? available in qfn 20 (3x5x1. 6 mm) package ? total s olution size 6.7mm x 7.3mm applications ? industrial controls ? medical and imaging equipment ? telecom and network ing applications ? ldo replacement ? space and resource - limited applications all mps parts are lead - free and adhere to the rohs directive. for mps gre en status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are r egistered t rademarks of monolithic power systems, inc. typical application mpm3606a in en vcc pg p gnd fb sw bst vin en r1 75k r2 24k c2 22f c1 10f 3.3v/0.6a 12v vout a gnd out r 3 1 00 k nc pg mpm3606a rev. 1 .0 www.monolithicpower.com 1 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor order ing information part number* package top marking mpm3606a gq v qfn - 20 (3 mm x5 mm x1.6mm) see below * for tape & reel, add suffix ? z (e.g. mpm3606a gqv ? z); top marking mp: mps prefix: y: year code; w: week code: 3 6 06 a : first f ive digits of the part number; lll: lot number; m: module ; mpm3606a rev. 1 .0 www.monolithicpower.com 2 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor package reference all nc pins must be left floating 1 in 13 pg pgnd nc sw en agnd sw 18 out fb pgnd nc 6 7 19 nc 2 17 11 9 8 5 4 3 16 15 14 sw out out pgnd nc 20 12 10 bst vcc top view absolute maximum rat ings (1) v in ................................................ - 0.3v to 28v v sw ................................................................ .... - 0.3v ( - 5v for <10ns) to 28v ( 30v for <10ns ) v bst ................................ ...................... v sw +6v all other pins ............................... - 0.3v to 6v (2) continuous power dissipation (t a = + 25 c) ( 3 ) ................................ ............................ 2.7 w junction temperature .............................. 150 c lead temperature ................................... 260 c storage temperature ................. - 65 c to 150 c recommended operating conditions (4 ) supply voltage v in .......................... 4.5 v to 2 1 v output voltage v out ............... 0.8 v to v in *d max (5) operating junction temp . (t j ). - 40 c to +125 c thermal resistance ( 6 ) ja jc qfn - 20 ( 3 mmx5 mm x1.6 mm) . 46 ...... 10 ... c/w notes: 1) exceeding these ratings may damage the device. 2) about the details of en pin?s abs max rating, please refer to page 1 4 , enable control section. 3) the maximum allowable power dissipation is a function of the maxi mum junction temperature t j (max), t he 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 ma ximum allowable power dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown. internal thermal shutdown circuitry protects the device from permanent damage. 4) the device is not guaranteed to function outside of its operating conditions. 5) in practical design, the minimum v out is limited by minimum on time, 50ns on time is commonly recommended for calculating to give some margin. for output voltage setting above 5.5v, please refer to the application information on page 1 7 . 6) measured on jesd51 - 7, 4 - layer pcb. mpm3606a rev. 1 .0 www.monolithicpower.com 3 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor electrical character istics v in =12v, t j = - 40c to +125c (7) , typical value is tested at t j =+25c, unless otherwise noted. parameter symbol condition min typ max units supply current (shutdown) i s v en = 0v, t j =+2 5 c 6.5 8 a a m m m a a v en =2v, t j = - 40 c to +125c 1.8 2.3 2.8 a power good rising threshold pg vth-hi t j =+25 c 0.86 0.9 0.95 v fb power good falling threshold pg vth- lo t j =+25 c 0.78 0.8 3 0.88 v fb power good rising delay pg td_rsing t j =+25 c 15 35 55 s t j = - 40 c to +125c 10 35 60 s power good falling delay pg td_falling t j =+25 c 40 80 125 s t j = - 40 c to +125c 30 80 135 s power good sink current capability v pg sink 1ma 0.4 v power good leakage current i pg- leak v pg =6v 1 a mpm3606a rev. 1 .0 www.monolithicpower.com 4 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor electrical character istics ( continued) v in =12v, t j = - 40c to +125c, typical value is tested at t j =+25c, unless otherwise noted. parameter symbol condition min typ max units vin under - voltage lockout threshold ? rising inuv vth t j =+25c 3.7 3.9 4.1 v t j = - 40c to +125c 3.65 3.9 4.15 v vin under - voltage lockout threshold ? hysteresis inuv hys 600 675 750 mv vcc regulator v cc t j =+25c 4.75 4.9 5.05 v t j = - 40c to +125c 4.7 4.9 5.1 v vcc load regulation i cc =5ma 1.5 3 % soft - start time t ss v out from 10% to 90% , t j =+25c 0.8 1.6 2.4 ms v out from 10% to 90% , t j = - 40c to +125c 0.6 1.6 2.6 ms thermal shutdown (8) t sd 150 c thermal hysteresis (8) t sd_hys 20 c notes: 7) not tested in production. guaranteed by over - temperature correlation. 8) guaranteed by c haracterizat ion test . mpm3606a rev. 1 .0 www.monolithicpower.com 5 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical characterist ics v in = 12v, v out = 3.3v, t a = 25c, unless otherwise noted. mpm3606a rev. 1 .0 www.monolithicpower.com 6 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical characterist ics (continued) v in = 12v, v out = 3.3v, t a = 25c, unless otherwise noted. mpm3606a rev. 1 .0 www.monolithicpower.com 7 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical characterist ics (continued) v in = 12v, v out = 3.3v, t a = 25c, unless otherwise noted. mpm3606a rev. 1 .0 www.monolithicpower.com 8 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical performance characteristics performance waveforms are captured from the evaluation board discussed in the design example section.v in = 12v, v out = 3.3v, t a = 25c, unless otherwise noted. mpm3606a rev. 1 .0 www.monolithicpower.com 9 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical performance characteristics ( continued ) performance waveforms are captured from the evaluation board discussed in the design example section.v in = 12v, v out = 3.3v, t a = 25c, unless otherwise noted. mpm3606a rev. 1 .0 www.monolithicpower.com 10 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor pin functions package pin # name description 1 fb feedback. conn ect fb to the tap of an external resistor divider from the output to a gnd to set the output voltage. to prevent current - limit runaway during a short - circuit fault , t he frequency foldback comparator lowers the oscillator frequency when the fb voltage is bel ow 4 00mv . place the resistor divider as close to fb as possible. avoid placing vias on the fb traces. 2 vcc internal 4.9 v ldo output. the module integrates a ldo output capacitor, so there is no need to add an external capacitor. 3 agnd anal og ground. reference ground of logic circuit. agnd is connected internally to pgnd , so t here is no need to add any external connections to pgnd. 4, 5, 6 sw switch output. large copper plane is recommended on pin s 4, 5 and 6 to improve thermal performance . 7, 8, 9 out power output. connect the load to out ; an o utput capacitor is needed. 10, 15, 19, 20 nc do not connect. nc must be left floating. 11 bst bootstrap. a b ootstrap capacitor is integrated internally , s o an e xternal connection is not needed. 12, 13, 14 p gnd power ground. reference ground of the power device . pcb layout r equires extra care , please refer to pcb guideline recommendations . for best results, connect to p gnd with copper and vias. 16 in supply voltage. in supplies power to the internal mosfet and regulator. the mpm3606a operates from a + 4.5 v to + 21 v input rail. it r equires a low - esr, and low - inductance capacitor to decouple the input rail. place the input capacitor very close to in and connect it with wide pcb traces and multiple vias. 17 en enable. pull en high to enable the module. leave en flo ating or connect it to g nd to disable the module. 18 pg power good indicator. pg is an open - drain output. connect pg to vcc ( or an other voltage source ) through a pull - up resistor (e.g. 100k ? ). additional details on pg behavior can be found in the operation s ection under ?power good indicator . ? mpm3606a rev. 1 .0 www.monolithicpower.com 11 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor functional block diagram pg out agnd pgnd en v ss v ref 718 mv rising 662 mv falling figure 1 . functional block diagram mpm3606a rev. 1 .0 www.monolithicpower.com 12 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor operation the m pm3606a is a high - frequency, synchronous, rectified, step - down, switch - mode converter with built - in power mosfets, integrated inductor , and two capacitors. it offers a compact solution that achieves a 0.6a continuous output current with excellent loa d and line regulation over a 4.5v to 2 1 v input - supply range. the mpm36 06 a has three working modes: a dvanced a synchronous m odulation (aam), similar to pfm mode , d iscontin uous c onduction m ode (dcm ) , and c ontinu ous c onduction m ode (ccm) . the load current inc reases as t he device transitions from aam mode to dcm to cc m. in particular conditions, th e device will not enter aam mode during a light - load condition (see power - save mode range graph on page 8). aam control operation in a light - load condition, mpm36 06a operates in aam mode (see f igure 2 ). t he v aam is an internal ly fixed voltage when input and output voltages are fixed. v comp is the error amplifier output , which represents the peak inductor current information. when v comp is lower th an v aam , the internal clock is blocked . this will make the mpm3606a skips pulses , achiev ing the light - load power save. refer to an032 for additional detail. the internal clock re - sets every time v comp exceeds v aam . simultaneousl y, the high - side mosfet (hs - fet) turns on and remains on until v ilsense reaches the value set by v comp . the light - load feature in this device is optimized for 12v input applications. 50 4 rt r 1 r 2 figure 2 . simpli fied aam control logic dcm control operation the v comp ramp s up as the output current increases. when its minimum value exceeds v aam , the device ent er s dcm. in this mode, the internal 2mhz clock initiates the pwm cycle, the hs - fet turns on and remains on until v ilsense reaches the value set by v comp (after a period of dead time), and then the low - side mosfet (ls - fet) turns on and remains on until the inductor - current value decreases to zero. t he device repeats the same operation in every clock cycle to reg ulate the output voltage (see figure 3) . v out hs - fet is on zero current detect i l v sw i out a clock cycle ls - fet is on hs /ls - fets are off figure 3 . dcm control operation ccm control operation the device enter s ccm from dcm once the inductor current no longer drops to zero in a clock cycle. in ccm , the internal 2m hz clock initiates the pwm cycle, the hs - fet turns on and remains on until v ilsense reaches the value set by v comp ( after a period of dead time ) , and then the ls - fet turn s on and remain s on until the next clock cycle starts. t he device repe at s the same operation in every clock cycle to regulate the output voltage. i f v ilsense does not reach the value set by v comp within 83% of one pwm period, the hs power mosfet will be forced off . internal v cc regulator a 4.9 v internal regulator powers most of the internal circuitries. this regulator takes v in and operates in the full v in range. when v in exceeds 4.9 v, the output of the regulator is in full regulation. if v in is less than 4.9 v, the output decreases . the device integrates an i nternal decoupling capacitor , so adding an external vcc output capacitor is unnecessary. mpm3606a rev. 1 .0 www.monolithicpower.com 13 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor error amplifier (ea) the error amplifier compares the fb voltage to the internal 0. 79 8v reference ( v ref ) and outputs a current proportional to the difference between the two. this output current then charge s or discharge s the internal compensation network to form the comp voltage ; the comp voltage control s 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 input - supply voltage. the mpm3606a uvlo comparator monitors the output voltage of the internal regulator ( vcc ) . the uvlo rising threshold is about 3.9v while its falling threshold is 3.2 2 5v. enable control (en) en turns the regulator on and off. drive en high to turn on the regulator; drive en low to turn off the regulator . an internal 870k ? resistor from en to gnd allows en to be floated to shut down the chip . en is clamped internally using a 6.5v series - zener - diode (see figure 4). connecting e n to a voltage source directly without a pull - up resistor requires limiting the amplitude of the v oltage source to 6v to prevent damage to the zener diode. connect ing the en input through a pull - up resistor to the voltage o n v in limits the en input current to less than 100a . for ex ample, with 12v connected to v in , r pullup (12v ? 6.5v) 100a = 55 k?. . 870 k figure 4 . 6.5v zener diode connection internal soft - start (ss) s oft - start prevents the converter output voltage from overshooting during start - up. when the chip starts up , the internal circuitry generates a soft - star t voltage (ss) that ramps up from 0v to 4.9 v. when ss is lower than v ref , the error amplifier uses ss as the reference. when ss is higher than v ref , the error amplifier uses v ref as the reference. the ss time is set internally to 1.6 ms (v out f rom 10% to 90% ) . pre - b ias s tart - u p the mpm3606a is designed for a monotonic start - up into a pre - biased output voltage . if the output is pre - biased to a certain voltage during start - up, the voltage on the soft - start capacitor is charged. when the s oft - s tart capacit or ? s voltage exceeds the sensed output voltage at fb, the device turn s on the hs - fet and the ls - fet sequentially . output voltage ramp s up following the soft - start slew rate . power good indicator (pg) the mpm3606 a has power good (pg) output to indicate whe ther the output voltage of the m odule is ready. pg is an open - drain output. connect p g to vcc ( or an other voltage source ) through a pull - up resistor (e.g. 100k?). when the input voltage is applied, pg is pulled down to gnd before internal v ss >1v. after v ss >1v, when v fb is above 90% of v ref , pg is pulled high (after a 35 s delay time ) . during normal operation, pg is pulled low when the v fb d rops below 83 % of v ref ( after a 80 s delay ) . when uvlo or otp occurs, pg is pulled low immediately; w hen oc ( o ver - current) occurs , pg is pulled low when v fb drops below 83% of v ref ( after a 8 0 s delay ) . since mpm36 06 a doesn?t implement dedicate d output ov er - voltage protection, the pg won?t response to an output over - voltage condition. over - current - protection and hiccup the mpm3606a has a cycle - by - cycle over - current limit ing control. w hen the inductor current - peak value exceeds internal peak current - limit t hreshold, the hs - fet turn s off and the ls - fet turn s on , remain ing on until the inductor current falls below the internal valley current - limit threshold. the valley current - limit circuit is employed to decrease the mpm3606a rev. 1 .0 www.monolithicpower.com 14 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor operation frequency (after the peak c urrent - limit threshold is triggered). meanwhile, the output voltage drops until v fb is below the u nder - v oltage (uv) threshol d ( 50% below the reference , typically) . once uv is triggered, the mpm3606 a enters hiccup mode to re - start the part periodically . thi s protection mode is useful when the output is dead - shorted to ground and greatly reduces the average short - circuit current to alleviate thermal issues and protect the converter . the mpm3606 a exits hiccup mode once the over - current condit ion is removed. th ermal shutdown (tsd) to prevent thermal damage, mpm3606a stops switching w hen the die temperature exceed s 150c . as soon as the temperature drops below its lower threshold ( 130c, typically), the power supply resumes operation. floating driver and bo otstrap charging an internal bootstrap capacitor powers the floating power mosfet driver. this floating driver has its own uvlo protection. this uvlo?s rising threshold is 2.2v with a hysteresis of 150mv. the bootstrap capacitor voltage is regulated intern ally by v in through d1, m 1 , c4, l1 and c2 ( see figure 5 ). if (v bst - v sw ) exceeds 5v, u 1 regulate s m 1 to maintain a 5v voltage across c4 . figure 5 . internal bootstrap charging circuit start - u p and shutdown if both v in and v en e xceed their respective thresholds, the chip starts up . the reference block starts first, generating stable reference voltage, and then the internal regulator is enabled. the regulator provides a stable supply for the remaining circuitries. three events shut down the chi p: v in low , v en low and thermal shutdown. during the shutdown procedure, the signaling path is blocked first to avoid any fault triggering. the comp voltage and the internal supply rail are then pulled down. the floating driver is not subject to this shutdown command. additional rc snubber circuit an a dditional rc snubber circuit can be chosen to cl amp the voltage spike and damp the ringing voltage for better emi performance. the power dissipation of the rc sn u bber circuit is estimated by the formul a below: = 2 loss s s in p fcv where f s is the switching frequency , c s is the sn u bber capacitor , and v in is the input voltage. for improved efficiency, the value of c s should not be set too high . generally, a 5.6 r s and a 330pf c s are recommended to generate the rc snubber circuit (see figure 6). sw r s c s 330pf 5.6 figure 6 . additional rc snubber circuit mpm3606a rev. 1 .0 www.monolithicpower.com 15 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor application informat ion setting the output voltage the external resistor divider set s the output voltage (see typical application on page 1). choose r1 (see table 1 ) ; r2 is then given by: out r1 r2 v 1 0.798v = ? figure 7 . feedback network see table 1 and figure 7 for the feedback network and a list of recomme nded feedback network parameters for common output voltages . table 1 . recommended parameters f or common output voltages small solution size(c in =10f/0805/25v, c out =22 f/0805/16v) low v out ripple( c in =10 f /0805/25v, c out =2x22f/0805/16v) v in (v) v out (v) r1 (k) r2 (k) c f (pf) v out ripple (mv) (9) r1 (k) 5n c f (pf) v out ripple (mv) (9) 21 5 115 22 ns 17.6 40.2 7.68 ns 9.4 3.3 102 32.4 ns 12.4 62 19.6 ns 7 2.5 102 47.5 5.6 10 62 29.4 5.6 5.2 19 5 115 22 ns 16.4 40.2 7.68 ns 8.8 3.3 102 32.4 ns 11.4 62 19.6 ns 6.6 2.5 102 47.5 5.6 9.8 62 29.4 5.6 5 16 5 115 22 ns 15.6 40.2 7.68 ns 7.8 3.3 102 32.4 ns 10.6 62 19.6 ns 6 2.5 102 47.5 5.6 9.6 62 29.4 5.6 4.8 1.8 102 82 5.6 8.6 62 49.9 5.6 4 14 5 115 22 ns 14.8 40.2 7.68 ns 7.4 3.3 102 32.4 ns 10.2 40.2 12.7 ns 5.6 2.5 75 34.8 5.6 9.4 40.2 18.7 5.6 4.6 1.8 102 82 5.6 8.4 62 49.9 5.6 4.2 1.5 (10) 158 180 5.6 7.2 62 69.8 5.6 3.6 1 2 5 100 19.1 ns 13.8 34 6.49 ns 6.4 3.3 75 24 ns 9.4 40.2 12.7 ns 5.2 2.5 75 34.8 5.6 9 40.2 18.7 5.6 4.4 1.8 102 82 5.6 7.8 47 37.4 5.6 4 1.5 (10) 158 180 5.6 6.6 47 53.6 5.6 3.4 1.2 (10) 158 316 5.6 6.2 75 147 5.6 3 mpm3606a rev. 1 .0 www.monolithicpower.com 16 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor table 1 : recommended p arameters for common output voltages (continued) small solution size(c in =10f/0805/25v, c out =22f/0805/16v) low v out ripple(c in =10f/0805/25v, c out =2x22f/0805/16v) v in (v) v out (v) r1 (k) r2 (k) c f (pf) v out ripple (mv) (9) r1 (k) 5n c f (pf) v out ripple (mv) (9) 10 5 100 19.1 ns 13.2 34 6.49 ns 6.2 3.3 75 24 ns 8.4 40.2 12.7 ns 4.8 2.5 75 34.8 5.6 8.2 40.2 18.7 5.6 4 1.8 75 59 5.6 7.2 47 37.4 5.6 3.6 1.5 102 115 5.6 6 47 53.6 5.6 3.2 1.2 (10) 102 205 5.6 5.4 62 124 5.6 2.8 1 (10) 102 402 5.6 4.8 82 324 5.6 2.6 8 5 100 19.1 ns 9.2 34 6.49 ns 5 3.3 75 24 ns 7.6 40.2 12.7 ns 3.8 2.5 75 34.8 5.6 7 40.2 18.7 5.6 3.4 1.8 75 59 5.6 6.4 47 37.4 5.6 3 1. 5 75 84.5 5.6 5.4 47 53.6 5.6 2.8 1.2 (10) 75 147 5.6 5 47 93.1 5.6 2.6 1 (10) 75 294 5.6 4.6 56 221 5.6 2.2 5 3.3 75 24 ns 6 40.2 12.7 ns 3.4 2.5 75 34.8 5.6 5.8 40.2 18.7 5.6 3.2 1.8 75 59 5.6 5.2 47 37.4 5.6 2.8 1.5 62 69.8 5.6 5 47 53.6 5.6 2.4 1.2 (10) 62 124 5.6 4.6 47 93.1 5.6 2.2 1 (10) 62 243 5.6 4.4 47 187 5.6 2 notes: 9) t he output voltage ripple is tested at 0.6a output current. 10) in these specs, bst operation current will charge the output voltage higher than the setting value when completely no load due to large divider resistor value. 10 a load current is able to pull the output voltage to normal regulation level. normally , it is recommended to set output voltage from 0.8v to 5.5v. however, it can be set highe r than 5.5v. in this case, the o utput - voltage ripple is larger due to a larger inductor ripple current. an ad ditional output capacitor is needed to reduce the output - ripple voltage. if output voltage is high, heat dissipation become s more important . refer to pc b oard layout guidelines on page 1 8 to achieve better thermal performance . selecting the input capacitor the input current to the step - down converter is discontinuous, and th erefore requires a capacitor to supply the ac current while maintaining the d c input voltage. use low esr capacitors for improved performance. use ceramic capacitors with x5r or x7r dielectrics for optimum results because of their low esr and small temperature coefficients. for most applications, use a 10 f capacitor. . mpm3606a rev. 1 .0 www.monolithicpower.com 17 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor since c1 absorbs the input - switching current, it requires an adequate ripple - current rating. the rms current in the input capacitor is estimated by: ? ? ? ? ? ? ? ? ? = in out in out load 1 c v v 1 v v i i the wors t case condition occurs at v in = 2v out , where: 2 i i load 1 c = . 0.1f ) placed as close to the ic as possible. when using ceramic capacitors, make sure they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. the input - voltage ripple caused by capacitance can be est imated as : load out out in in s in iv v v1 f c1 v v ?? ? = ? ?? ?? selecting the output capacitor the output capacitor (c2) maintain s the dc output voltage. use ceramic , tantalum, or low esr electrolytic capacitors. for best results, use low esr capacitors to keep the output - voltage ri pple low. the output - voltage ripple is estimated as : out out out esr s 1 in s vv 1 v 1r f l v 8 f c2 ?? ?? ? = ? + ?? ?? ?? ?? h . for ceramic capacitors, the capacitance dominates the impedance at the switching frequency ; the capacitance causes the majority of the output - voltage ripple. for simplification, the output - voltage ripple is estimated as : out out out 2 in s1 vv v 1 v 8 f l c2 ?? = ? ?? ?? v 1 r fl v ?? = ? ?? ?? pc board layout ( 1 1 ) efficient pcb layout is critical to achieve stable operation , particularly for input capa citor placement. for best results, refer to figure 8, and follow th e guidelines below : 1. use large ground plane to connect directly to pgnd . add vias near the pgnd if the bottom layer is ground plane. 2. the high - current paths ( pgnd, in and out) should have short, direct and wide traces. place the ceramic input capacitor close to in and pgnd . keep the input capacitor and in connection as short and wide as possible . 3. place t he external feedback resistors next to fb. 4. keep the feedback network away from the switching node. notes: 1 1 ) the recommende d layout is based on typical application c ircuit s section on page 20. mpm3606a rev. 1 .0 www.monolithicpower.com 18 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor agnd sw out fb vcc nc bst nc pg en in nc pgnd c1 r2 r1 c2 pgnd vout gnd vin r3 6.3mm 6.7mm pgnd nc nc c3 7.3mm top layer vout gnd bottom layer figure 8 . recommend ed pc board layout design example table 2 shows a design example following the application guidelines for the specifications : table 2 . design example v in 12 v v out 3.3 v i out 0.6a the detailed application schematic is shown in figure 10 . the typical performance and circuit waveforms are shown in the typical characteristics section ( for additional device applications, please refer to the related e valuation b oard d atasheets ) . mpm3606a rev. 1 .0 www.monolithicpower.com 19 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical application circuits (1 2 )(1 3 ) mpm3606a in en vcc pg a gnd fb sw bst vin en r1 100k r2 19.1k c2 22 f c1 10 f 5v/0.6a 12v vout p gnd out r3 100k r4 100k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 pg nc 10 , 15 , 19 , 20 figure 9 . vo=5v, io= 0.6a mpm3606a in en vcc pg a gnd fb sw bst vin en r1 75k r2 24k c2 22 f c1 10 f 3.3v/0.6a 12v vout p gnd out r3 100k r4 100k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 pg nc 10 , 15 , 19 , 20 figure 10 . vo=3.3v, io= 0.6a mp m 36 06 a in en vcc pg a gnd fb sw bst vin en r 1 75 k r 2 34 . 8 k c 2 22 f c 1 10 f 2 . 5 v / 0 . 6 a 12 v vout p gnd out r 3 1 00 k r 4 100 k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 c 3 5 . 6 pf nc 10 , 15 , 19 , 20 figure 11 . vo=2.5v, io= 0 .6a mpm3606a rev. 1 .0 www.monolithicpower.com 20 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical application circuits ( continued ) mp m 36 06 a in en vcc pg a gnd fb sw bst vin en r 1 102 k r 2 82 k c 2 22 f c 1 10 f 1 . 8 v / 0 . 6 a 12 v vout p gnd out r 3 1 00 k r 4 100 k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 c 3 5 . 6 pf nc 10 , 15 , 19 , 20 figure 12 . vo=1.8v, io= 0.6a mp m 3606a in en vcc pg a gnd fb sw bst vin en r1 158k r2 180k c2 22 f c1 10 f 1.5v/0. 6a 12v vout p gnd out r3 100k r4 100k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 c3 5.6pf nc 10 , 15 , 19 , 20 figure 13 . vo= 1.5 v, io= 0.6a mp m 3606a in en vcc pg a gnd fb sw bst vin en r1 158k r2 316k c2 22 f c1 10 f 1.2v/0.6a 12v vout p gnd out r3 100k r4 100k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 c3 5.6pf nc 10 , 15 , 19 , 20 figure 14 . vo=1 .2 v, io= 0.6a mpm3606a rev. 1 .0 www.monolithicpower.com 21 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor typical application circuits ( conti nued ) mp m 36 06 a in en vcc pg a gnd fb sw bst vin en r 1 158 k r 2 634 k c 2 22 f c 1 10 f 1 v / 0 . 6 a 12 v vout p gnd out r 3 1 00 k r 4 100 k 16 17 2 18 11 4 , 5 , 6 7 , 8 , 9 1 3 12 , 13 , 14 c 3 5 . 6 pf nc 10 , 15 , 19 , 20 figure 1 5 : vo=1v, io= 0.6a notes: 1 2 ) in 12v in to 1v out application condition , the hs - fet?s on time is close to minimum on time, the sw may have a little jitter, even so the output voltage ripple is smaller than 15mv i n pwm mode . 1 3 ) in 12v in to 1.5/1.2/1 v out application condition , bst operation current will charge the output voltage higher than the setting value when completely no load due to large divider resistor value. 10 a load current is able to pull the outpu t voltage to normal regulation level. mpm3606a rev. 1 .0 www.monolithicpower.com 22 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.
mpm36 06 a ? synchronous step - down module with integrated inductor package information qfn - 20 (3 mmx5 mm x1.6 mm) c g ou g o 0 cq ( 3 5 ) o 0 5 e so 6 0 side view bottom view note : 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 . pin 1 id marking top view pin 1 id index area recommended land pattern pin 1 id 0 . 125 x 45 o typ 0 . 125 x 45 o note 2 note 2 notice: the informa tion in this document is subject to change without notice. users should warrant and guarantee that third party intellectual property rights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibil ity for any said applications. mpm3606a rev. 1 .0 www.monolithicpower.com 23 1/5/2015 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2015 mps . all rights reserved.

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