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MP3414A 3a, 1mhz , 22 a iq, 5.5 v s ynchronous step - u p converter with output disconnect MP3414A rev. 1. 1 www.monolithicpower.com 1 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. description the MP3414A is a high - e fficiency, synchronous current mode , step - up converter wit h output disconnect. the MP3414A can start up f rom an input voltage as low as 1 .8v while provid ing inrush current limiting and o utput short - circuit protection (scp) . the integrated p - channel synchronous rectifier improves efficiency and eliminates the need for an external schottky diode. the pmos disconnects the output from the input when the MP3414A shuts down. th e out put disconnect feature allows the output to b e discharged completely , allowing the MP3414A to draw a supply current of under 1a in shutdown mode. the 1mhz switching frequency allows small external co mponents while the internal compensation and soft start minimize the external component count . t hese feature s produce a compact solution for a wid e current load range. the MP3414A features an integrated power mosfet that supports an output of up to 5.5v and a peak switching curren t above 3a. the MP3414A is available in a small 8 - pin tsot23 package. features ? support s 5v/1a output at 2.8v input ? 1.8 v to 5.5 v input voltage range ? up to 5.5v ou tput voltage ? internal synchronous rectifier ? 1m hz fixed switching frequency ? 2 2 a quiescent current ? <1a shutdown current ? tr ue output disconnect from input ? up to 9 7 % efficiency ? internal compensation , inrush current limiting , and internal soft start ? tiny external components ? ovp, scp , and otp ? tsot23 - 8 package applications ? two - c ell and three - c ell alkal ine, nicd or nimh , or single - c ell li battery - power products ? personal medical devices ? portable media players ? wireless peripherals ? gaming accessories all mps parts are lead - free , halogen - free, and adhere to the rohs directive. for mps green status, please visit the mps website under quality assurance . mps and the future of analog ic technology are registered trademarks of monolithic power systems, inc. typical application m p 3 4 1 4 a s w l 1 1 . 5 u h o u t i n p g n d f b e n r 1 1 m c 2 2 2 f v o u t c 1 1 0 f a g n d v i n o n o f f r 2 1 3 7 k
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 2 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. ordering information part number* package top marking MP3414A gj tsot23 - 8 see below * for tape & reel, add suffix C z ( e. g. mp 3414agj C z) top marking a kt : p roduct code of MP3414A gj y: y ear code package reference top view 1 2 3 4 8 7 6 5 e n f b s w p g n d i n o u t f t y a g n d
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 3 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. absolute maximum rat ings (1) sw , out ................................ ... - 0.3 v to + 6.5 v s w ( < 5 ns) ................................ .... - 0.3 v to + 9 v all other p ins ............................... - 0.3v to + 6 . 5 v continuous p ower d issipation (t a = + 2 5 c) (2) ................................ ................................ 1.25w junction t emperature ............................... 150 ? c lead t emperature ................................ .... 260 ? c storage t emperature ................ - 65 ? c to +150 ? c recommended operating conditions ( 3 ) supply v oltage ( v in ) ....................... 1.8 v to 5.5v v out ............................. v in - max x 106% to 5.5 v (4) ope rating j unction t emp . (t j ). .. - 40 c to +125 c thermal resistance ( 5 ) ja jc tsot23 - 8 .............................. 10 0 .... 55 ... 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), t he junction - to - ambient thermal re sistance 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 power dissipation will produce 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 , th e boost converter may trigger minimum on - time . w hen v in is higher than v out , the boost converter will switch between boost mode and linear charge mode. both condition s will result in a v out - ripple that is too high . t herefore , this is not suggested . 5) measured on jesd51 - 7, 4 - layer pcb.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 4 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. electrical character istics 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 c urrent i q v en = v in = 3.3 v, v out = 5v, no load, v fb = 0.65v , m easured on out , t j = 25 c 22 30 a v en = v in = 3.3 v, v out = 5v, no load, v fb = 0.65v , m easured on in , t j =25 c 8 12 a shutdown c urrent i sd v en = v out = 0v, m easured on in t j = 25 o c 0.1 1 a in u nder - v oltage l ocko ut v in_ uvlo v in r ising , t j = 25 c . 1.65 1.7 v in u nder - v oltage l ockout h ysteresis 1 00 mv step - u p converter operation f requency f sw 0.8 1.0 1.2 mhz feedback v oltage r eference v fb t j = 25 c 594 600 60 6 m v t j = - 40 c to 125 c 591 600 609 mv feedback i nput c urrent i fb v fb = 0.63v 1 50 na nmos o n r esistance r nds_on 70 m? nmos l eakage c urrent i n_lk v sw = 6.5v , t j = 25 c . 0.1 1 a pmos o n r esistance r pds_on 8 0 m? pmos l eakage c urrent i p_lk v sw = 6.5v, v out = 0v , t j = 25 c . 0.1 1 a maximum d uty c ycle d max 85 95 % start - u p c urrent l imit i st_limit v in = 4v, vo = 0v 0.3 a v in = 4v, vo setting = 3. 6 v , pull vo to 3 .3 v 0. 8 a nmos c urrent l imit i sw_limit duty = 40% 3 3.6 a logic interface en i nput h igh - l evel v oltage v en _ h 1.2 v en i n put l ow - l evel v oltage v en_l 0.4 v en i nput c urrent i en connect to v in 10 na protection thermal s hutdown ( 6 ) 15 5 c over - t emperature h ysteresis ( 6 ) 2 5 c note : 6) guaranteed by characterization, not production test ed .
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 5 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical performance characteristics v in = 3 .3 v, v out = 5v , l = 1.5 h, t a = 25c, unless otherwise noted.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 6 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical performance characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5 h, t a = 25c, unless otherwise noted.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 7 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical performance characteristics (continued) v in = 3 .3 v, v out = 5 v, l = 1.5 h, t a = 25c, unless otherwise noted. note : 7) tested with a 3a inductor peak current with the schematic in f igure 3. the maximum load current may decrease if the temperature rising is limited on the real applicat ion board.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 8 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical performance characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5 h, t a = 25c, unless otherwise noted.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 9 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical performance characteristics (continued) v in = 3.3v, v out = 5v, l = 1.5 h, t a = 25c, unless otherwise noted.
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 10 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. pi n functions pin # name pin function 1 in power supply input . the start - up bias is derived from in and m ust be bypassed locally . once the out voltage exceeds the in voltage , the bias power come s from out . 2 out output . out is the drain of the i nternal s ynchronous r ectifier mosfet. bias power is derived from out when v out is higher than v in . the pcb trace length from out to the output filter capacitor(s) should be as short and wide as possible. the outpu t disconnect feature allows out to be disconnected completely from in when en is low . 3 sw power switch output . sw is the connection node of the internal low - side mosfet and synchronous mo sfet . connect the power inductor between sw and the input power . k eep the pcb trace leng th as short and wide as possible to reduce emi and voltage spikes. 4 pgnd power ground . 5 fty factory use only. leave fty floating or connec t it to ground in application. 6 agnd analog ground . 7 fb feedback. connect to the tap of an external resistive voltage divider from the output to fb to set the output voltage. 8 en chip enable control input . set en higher than 1. 2v to tu rn on the regulator . set en lower than 0. 4 v to turn off the regulator .
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 11 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. function diagram figure 1 : functional block diagram d r i v e r a n d c o n t r o l l o g i c + - c u r r e n t s e n s e a m p l i f i e r o s c i l l a t o r s w o u t a g n d e a f b e n b i a s a n d v o l t a g e r e f 0 . 6 v s l o p e c o m p p w m c o m p s t a r t - u p m o d e c o n t r o l v i n b o d y c o n t r o l v d d i n e n a b l e + - + - + v b e t t e r s o f t s t a r t o u t o v p c l a m p s t h e r m a l c o n t r o l + - c u r r e n t s e n s e p g n d p g n d h s l s l v i n o n o f f p g n d v o u t p g n d c o u t r 1 r 2 c i n p g n d c u r r e n t l i m i t
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 12 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. operation the MP3414A is a 1m hz synchronous step - up converter in a compact tsot23 package with true output disconnect. t he device features a fixed - frequency , current - mode pwm control for good line and load regulation. internal soft start and loop compensation simplify the design process and minimize external components. the combined internal low r ds (on) mosfets and frequency stretching allow the MP3414A to maintain high efficiency over a wide current loa d range. start - up when enabled , the MP3414A start s up in linear charg e mode . during the linear charge, the rectifie d pmos turn s on until the output voltage is charge d close to v in . to avoid inrush current, t he pmos current is limited to about 0. 3 a ( when v out is 0v ) . t he pmos linear charge current limit is increase d to about 0. 8 a while v out rises to 3 .3 v (if v in is higher than 3.3v). t his circuit helps limit the output current under short - circuit conditions . once the output voltage reaches v in , the linear ch arging period elapse s , and the device starts switching . v out starts to rise under the control of the internal soft start (ss) . in boost switching condition s , the current limit is 3 .6 a , typically . when the output voltage is higher than v in , the MP3414A powers its internal circuits from v out instead of v in . this allows strong driving capabilit ies and high efficiency , even if v in drop s as low as 1. 8 v. soft start (ss) the MP3414A provides a soft start (ss) by charging an internal capacitor with a current source. d uring the linear charge period , t he ss signal keep s rising , follow ing fb . on c e the linear charge elapse s , t he voltage on the ss capacitor is char ged and ramps up the reference voltage based on the internal fixed slew - rate . the ss capa citor is discharged completely during a commanded shutdown , thermal shutdow n , or short circuit at the output. device enable (en) the device begins operat ing if en is set high er than 1. 2 v . it enters shut down mode if en is lower than 0.4v . in shutdown mode, the regulator stops switching, all internal control circuit s switch off, and the output disconnect s from the input completely . power - s ave mode (psm) the MP3414A enter s power - save mode (psm) automatically when the load decreases . it switches back to pwm mode when the load increases. in psm, the converter stretches the freq uency down to save switching and driver losses . in a ddition, the switch frequency is stretched down too when the input voltage is close to the o utput voltage ( which trigger s the minimum on - time if ke pt at a 1mhz frequency) . t his help s decrease the output ripple by avoid ing group - pulse mode . under a very light - load condition, the MP3414A continues to run in group - pu l se mode to regulate the output voltage and save more power. error amp lifier (ea) the error amplifier (ea) is an internally compensated amplifier . the ea compares the internal 0.6 v reference voltage against v fb to generate an ea signal , which in turn controls v out . the output voltage of the mp3414 a is adjusted via fb by an external resistor divider . s ee equation ( 1 ) : (1) set ting a high value for r1 and r2 achieve s a low quiescent current. however, a resistance set too high will be sensitive to noise an d lead to a low loop bandwidth. s et the r1 value between 499k to 1m for good leakage, stability and transient balance. current sensing in a linear charge condition, the high - side pmos current is sensed and compared with the current limit thre shol d . t he compared output man a ges the linear charge current. in a boost switching condition, l ossless current sensing converts the nmos switch current signal to a voltage that is summed with the internal slope compensation. the summed signal is com pared with the ea output to provide a peak current control command for the pwm. the p eak switch current is limited to approximately 3 .6 a . the switch current signal is out r1 v 0.6v (1 ) r2 ? ? ?
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 13 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. blanked for 60ns int ernally to enhance noise immunity . output disconnect the MP3414A is designed to allow a true output disconnect by elimin ating body diode conduction of the internal pmos rectifier. this allows v out to reach 0v during shutdown, dr awing zero current from the input source. this also allows for inrush current limiting at start - up , which minimiz es the surge current seen by the input supply. to obtain the advantage s of the output disconnect, there must not be an external s chottky diode connected between sw and v out . over l oad (olp) and short - circuit protection (scp) when an over load or a short circuit occurs, the output voltage drops. if v out drops below v in ( 0.3 v ) , the MP3414A stop s for about 50 s a nd then run s in a li near charge mode a t start - up . if the over load or short circuit is removed, the MP3414A restart s automatically under ss control. over - voltage protection (ovp) if the voltage on v out is higher than the typical 6v threshold, the boost swi tching stops. after the output drops to about 5. 7 v, 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 excee ds 15 5 c, the converter turn s off. once the temperature drops below 1 30 c, the converter re start s .
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 14 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. application in formation component selection input capacitor selection low equivalent series resistance ( esr ) input capacitors reduce input switching noise and reduce the peak current drawn from the battery. ceramic capacitors are recommended for input deco upling and should be placed as close to the device as possible . a ceramic capacitor larger than 10 f is recommended to limit the v in ripple. output capacitor selection to ensure stability over the full operating range, t he o utput capacitor requires a minimum capacitance value of 22f at the programmed output voltage . a higher capacitance value may be required to lower the output and transient ripple. low esr ca pacitors such as x5r or x7r type are recommended. supposing the esr is zero, use equation 2 to calculate the minimum output capacitor to support the ripple in the pwm mode : ( 2 ) v out(max) = maximum o utput v oltage v in(min) = minimum i nput voltage i o = output current f s = switching frequency v = acceptable output ripple a 1 f ceramic capacitor is recommended between v o ut and pg nd with a short loop . this reduces spikes on the sw node and improves emi performance. inductor selection t he mp34 14a utilize s small surface mount ed chip inductor s d ue to its 1m hz switching frequency . inductor values between 1h and 2.2h are suitable for most applications. larger values of inductance allow for slightly grea ter output current capabilit ies by reducing the inductor ripple current . however, larger value inductance s will increase the component size. the minimum inductance value is given using equation (3) : ( 3 ) i l = ac ceptable inductor current ripple typically, t he inductor current ripple is set to 30% to 5 0% of the maximum inductor current. maintain a low dcr (series resistance of the inductor) t o reduce resistive power los s . the saturated current (i sat ) should be large enough to support the peak current. 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, r efer to figure 2 and follow the guidelines below : 1. place t he output capacitor as close as possible to out with minimal distance to pgnd. a small decoupling capacitor should be in p arallel with the bulk output capacitor . 2. p lace the s ma ll decoupling capacitor as close as possible to out and pgnd . this is very important to reduce the spikes on sw and improve emi performance. 3. place t he input capacitor an d inductor as close as possible to i n and sw . the trace between the inductor and sw should be as wide and short as possible. 4. place the feedback loop far away from all noise sources ( such as sw ) . the feedback divider resistors should be as close as possible to fb and ag nd . 5. t ie t he ground return of the input/output capacitors as close as possible to pg nd u s ing a large copper g nd are a. vias around g nd are recommended to lower the die temperature . o out(max) in(min) o s out(max) i (v v ) c fv v ?? ? ?? in(min) out(max) in(min) out(max) l s v (v v ) l v i f ?? ? ? ? ?
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 15 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. figure 2 : recommended pcb layout design example see table 1 b elow for a design example following the application guidelines for the specifications below : table 1 : design example v in 2.8v - 4. 2 v v out 5v i out 0a - 1 a the typical application circuit for v out = 5 v in figure 3 shows the detailed application schematic and the basis for the typical performance waveforms. for additional detailed device applications, please refer to the related e va luation b oard d atasheet (evb) . t o p l a y e r b o t t o m l a y e r v i a c 2 b c 2 a c 1 r 1 r 2 l 1 m p 3 4 1 4 a v i n g n d v o u t g n d
MP3414A 3a, 1mh z step - up converter with ou tput disconnect MP3414A rev. 1. 1 www.monolithicpower.com 16 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. ? 2017 mps. all rights reserved. typical applicat ion circuits figure 3 : typical boost application circuit, v in = 2.8v to 4.2v, v out = 5v, i out = 0a - 1 a figure 4 : typical boost application circuit, v in = 1.8v to 3v, v out = 3.3v, i out = 0a - 1a 1 3 7 k r 2 1 m r 1 2 2 f c 2 a g n d g n d 1 0 0 k r 3 g n d 1 . 5 h l 1 1 f c 2 b g n d g n d 1 0 f c 1 i n e n f b o u t a g n d p g n d s w u 1 v i n v o u t m p 3 4 1 4 a 2 2 0 k r 2 1 m r 1 2 2 f c 2 a g n d g n d 1 0 0 k r 3 g n d 1 . 5 h l 1 1 f c 2 b g n d g n d 1 0 f c 1 i n e n f b o u t a g n d p g n d s w u 1 v i n v o u t m p 3 4 1 4 a
MP3414A 3a, 1mh z step - up converter with ou tput disconnect notice: the information 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 responsibility for any said applications. MP3414A rev. 1. 1 www.monolithicpower.com 17 6/26/2017 mps proprietary information. patent protected . unauthorized photocopy and duplication prohibited. p reliminary s pecifications s ubject to c hange ? 2017 mps. all rights reserved. package information tsot23 - 8 f r o n t v i e w n o t e : 1 ) a l l d i m e n s i o n s a r e i n m i l l i m e t e r s . 2 ) p a c k a g e l e n g t h d o e s n o t i n c l u d e m o l d f l a s h , p r o t r u s i o n o r g a t e b u r r . 3 ) p a c k a g e w i d t h d o e s n o t i n c l u d e i n t e r l e a d f l a s h o r p r o t r u s i o n . 4 ) l e a d c o p l a n a r i t y ( b o t t o m o f l e a d s a f t e r f o r m i n g ) s h a l l b e 0 . 1 0 m i l l i m e t e r s m a x . 5 ) j e d e c r e f e r e n c e i s m o - 1 9 3 , v a r i a t i o n b a . 6 ) d r a w i n g i s n o t t o s c a l e . 7 ) p i n 1 i s l o w e r l e f t p i n w h e n r e a d i n g t o p m a r k f r o m l e f t t o r i g h t , ( s e e e x a m p l e t o p m a r k ) . t o p v i e w r e c o m m e n d e d l a n d p a t t e r n s e a t i n g p l a n e s i d e v i e w d e t a i l ' ' a ' ' s e e d e t a i l ' ' a ' ' i a a a a p i n 1 i d s e e n o t e 7 e x a m p l e t o p m a r k

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