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mp 1601a 1a synchronous step - down converter with forced ccm mode mp 1601a rev. 1.0 www.monolithicpower.com 1 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. description the mp 1601a is a monolithic, step - down, switch - mode converter with built - in , internal power mosfets. it achieve s 1a of continuous output current from a 2. 3 v to 5.5v input voltage range with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. the constant - on - t ime (cot) control scheme in forced continuous conduction mode ( cc m ) provides a fast transient response , a low output voltage ripple, and eases loop stabilization . fault protections include cycle - by - cycle current limiting and thermal shutdown. the mp 1601a is available in a n ultra - small sot563 package and requires a minimal number of readily available , standard , external components. the m p 1601a is ideal for a wide range of applications including high - performance dsps, wireless power, portable and mobile d evices, and other low - power systems. features ? 2. 2 mhz switching frequency ? en for power sequencing ? wide 2. 3 v to 5.5v operating input range ? output adjustable from 0.6v ? up to 1a output current ? 1 6 0m? and 12 0m? internal power mosfet switches ? output discharge ? 100% duty cycle ? short - circuit protect ion (scp) with hiccup mode ? stable with low esr output ceramic capacitors ? continuous conduction mode (ccm) ? available in a sot563 package applications ? wireless/networking cards ? portable and mobile devices ? battery - powered / wearable devices ? low - voltage i/o syste m power 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 1 6 0 1 a g n d f b v i n c 1 1 0 f e n v i n 5 v v o u t 1 . 2 v / 1 a s w c 2 1 0 f r 1 2 0 0 k ? r 2 2 0 0 k ? e n o u t l 1 1 h
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 2 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking mp 1601a gtf sot563 see below * for tape & reel, add suffix C z (e . g. mp 1601a gtf C z) top marking auk : product code of mp 1601a gtf y: year code ll l : lot number package reference top view sot563 f b g n d v i n s w e n o u t 1 2 3 4 5 6
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 3 9/2/2016 mps pr oprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. absolute maximum rat ings (1) supply voltage ( v in ) ................................ ...... 6 v v sw ............................... - 0.3v ( - 5 v for <10ns) to 6 v ( 8v for <10ns or 10v for <3ns ) all other pins ................................ .... - 0.3v to 6v junction temperature ............................... 150 c lead temperature ................................ .... 260 c continuous power dissipation (t a = + 25 c) (2) ... ................................ .................... 1 w storage temperature ................ - 65 c to +150 c recommended operating conditions ( 3 ) supply voltage ( v in ) ...................... 2. 3 v to 5.5 v operating junction temp . (t j ). .. - 40 c to +125 c thermal resistance ( 4 ) ja jc sot563 ................................ 130 ...... 60 ... 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 resistance ja , and the ambient temperat ure 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 produces an excessive die temperature, causing the regulat or 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) measured on jesd51 - 7, 4 - layer pcb.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 4 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical character isti cs v in = 3.6v, t j = - 40c to +125c, typical value is tested at t j = +25c. the limit over temperature is guaranteed by characterization, unless otherwise noted. parameter symbol condition min typ max units feedback voltage v fb 2. 3 v v in 5.5v , t j = 25 c 594 600 606 mv t j = - 40c to + 12 5c 588 612 feedback current i fb v fb = 0.63v 50 10 0 na p - fet switch on resistance r dson_p 1 6 0 m? n - fet switch on resistance r dson_n 12 0 m? swit ch leakage current v en = 0v, t j = 25 c 0 1 a p - fet peak current limit sourcing 2 a n - fet valley current limit sourcing, valley current limit 1.2 a on time t on v in = 5v, v out = 1.2v 1 1 0 n s v in = 3.6v, v out = 1. 2v 15 0 switching frequency f s v in = 5v, v out = 1.2v, i out = 500ma, t j = 25 c (5) 2200 khz v in = 5v, v out = 1.2v, i out = 500ma , t j = - 40c to +125c (5) 2200 khz minimum off time t min _ off 60 n s minimum o n time (5) t mi n _ o n 60 n s soft - start time t ss _ on v out rise from 10% to 90% 0.5 m s under - voltage lockout threshold rising 2 2. 25 v under - voltage lockout threshold hysteresis 15 0 m v en input logic low voltage 0.4 v en input logic high voltage 1.2 v output discharge resistor r dis v en = 0v , v out = 1.2v 1 k? en input current v en = 2v 1.2 a v en = 0v 0 a supply current (shutdown ) v en = 0v, t j = 25 c 0 1 a supply current (quiescent ) v en = 2v, v fb = 0.63v, v in = 3.6v, 5v, t j = 25 c 0.5 m a thermal shutdown (6) 1 6 0 c thermal hysteresis (6) 30 c notes : 5) guaranteed by characterization. 6) guaranteed by design.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 5 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics v in = 5v, v out = 1.2v, l = 1. 0h, c out = 10 f, t a = +25 c, unless otherwise noted.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 6 9/2/2016 mps pr oprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 7 9/2/2016 mps pr oprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 8 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5 v, v out = 1.2v , l = 1.0h, c out = 10 f, t a = +25 c, unless otherwise noted.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 9 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5 v, v o ut = 1.2v , l = 1.0 h, c out = 10 f, t a = +25 c, unless otherwise noted.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 10 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performance characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, c out = 10 f, t a = +25 c, unless otherwise noted.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 11 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. pin functions pin # name description 1 fb feedback . an external resistor divider from the output to gnd tapped to fb sets the output voltage. 2 gnd power ground . 3 vin supply voltage . the mp 1601a operates from a 2. 3 v to 5.5 v unregulated input. a decoupl ing capacitor is needed to prevent large voltage spikes from appearing at the input . 4 sw output switching node . sw i s the drain of the internal , high - side , p - channel mosfet. connect the inductor to sw to complete the converter. 5 en on/ off control . 6 out output voltage power rail and i nput sense pin for the output voltage . connect the load to out . an output ca pacitor is needed to decrease the output voltage ripple.
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 12 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. block diagram figure 1 : functional block diagram m a i n s w i t c h ( p c h ) s y n c h r o n o u s r e c t i f i e r ( n c h ) c o n s t a n t o n - t i m e p u l s e p w m b i a s & v o l t a g e r e f e r e n c e 0 . 6 v e n f b s w v i n + + - f b c o m p e n d r i v e r p d r v n d r v s o f t s t a r t g n d o u t p w m e . a . + - + r a m p g e n e r a t o r c o m p + - v o u t r s t s w l o - i q l o - i q l o - i q l o - i q v t h
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 13 9/2/2016 mps pr oprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mp 1601a uses constant on - time control with input voltage feed - forward to stabilize the switching frequency over the full input range. it achieves 1a of cont inuous output current from a 2.3v to 5.5v input voltage range with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. constant - o n - time (cot) control compare d to fixed - frequency pulse - width modulation ( pwm ) contro l, constant - on - time control (cot) offers a simpler control loop and a faster transient response. by using input voltage feed - forward, the mp 1601a maintains a nearly constant switching frequency across the input and output voltage ranges. the switch ing pulse on time can be estimated with equation (1) : (1) to prevent inductor current run away during the load transient, the mp 1601a uses a fixed minimum off time of 60ns. enable (en) when the input voltage is greate r than the under - voltage lockout (uvlo) threshold ( typically 2v ) , the mp 1601a can be enabled by pulling en higher than 1.2v. floating en or pull ing it down to ground disable s the mp 1601a . there is an inter nal 1m resistor from en to ground. when the device is disabled, the mp1601 a goes into output discharge mode automatically . its internal discharge mosfet provides a resistive discharge path for the output capacitor. s oft s t art (ss) the mp 1601a has a built - in soft start (ss) that ramps up the output voltage at a controlled slew rate to avoid overshoot ing at start - up. the soft - start time is about 0.5ms , typically. current limit the mp 1601a has a 2 a , high - side , switch current limit , typically . when the high - side switch reaches its current limit, the mp 1601a remain s in hiccup mod e until the current drops. this prevents the inductor current from continuing to rise and damag ing components. short c ircuit and r ecovery the mp 1601a enter s short - circuit protection (scp) mode when it reaches the current limit and attempts to recover with hiccup mode . in this process, the mp 1601a disable s the output power stage, discharge s the soft - start capacitor , and then attempts to soft start automatically . if the short - circuit condition r emains after the soft start ends, the mp 1601a repeats this cycle until the short circuit disappears and the output rises back to regulation level s . out on in v t 0.454 s v ? ? ?
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 14 9/2/2016 mps pr oprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application informat ion setting the output voltage the external resistor divider sets the output voltage (see the typical application on page 14 ). select the feedback resistor ( r1 ) to reduce the v out leakage current, typically between 100k to 200k. there is no strict requirement on the feedback resistor. r1 > 10k is reason able for the application. r2 can then be calculated with equation (2): (2) figure 2 shows t he feedback circuit . figure 2 : feedback network table 1 lists the recommended resistor value s for common output voltages. table 1 : resistor values for common output voltages v out (v) r1 (k?) r2 (k?) 1.0 200 (1%) 300 (1%) 1.2 200 (1%) 200 (1%) 1.8 200 (1%) 100 (1%) 2.5 200 (1%) 63.2 (1%) 3.3 200 (1%) 44.2 (1%) selecting the inductor most applications work best with a 0.47 h to 2.2 h inductor. select an inductor with a dc resistance less than 50 m? to optimize efficiency. h i gh - frequency , switch - mode power suppl ies with a magnetic device have strong electronic magnetic inference for the system. any un shield ed power inductor should be avoided since it has poor magnetic shielding. metal alloy or multiplayer chip power shield inductor s are recommended for the application since they can decrease influence effectively. table 2 lists some recommended inductors. table 2: suggested inductor list manufacturer p/n inductance ( h ) manufacturer pife25201b - 1r0ms 1 .0 cyntec co. ltd. 1239as - h - 1r0m 1 .0 tokyo 74438322010 1 .0 wurth for most designs, the inductance can be estimated with equation (3) (3) where ? i l is the inductor ripple current. choose the inductor current to be approximately 30% of the maximum load current. the maximum inductor peak current can be calculated with equation (4) : (4) 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 step - down converter while maintaining the dc input voltage. use low esr capacitors for the best performance. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 10f capacitor is sufficient. higher output voltages may require a 22 f capacitor to increase system stability. the input capacitor requires a n adequate ripple current rating since it absorbs the input switching current. estimate the rms current in the input capacitor with equation (5) : ( 5) the worst - case scenario occurs at v in = 2v out , shown in equation (6) : (6) out r1 r2 v 1 0.6 ? ? r 1 r 2 v o u t f b m p 1 6 0 1 a out in out 1 in l osc v (v v ) l v i f ?? ? ? ? ? l l(max) load i ii 2 ? ?? out out c1 load in in vv i i 1 vv ?? ?? ? ?? ?? ?? ? ? ? load c1 i i 2 ?
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 15 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. 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 , 0.1f , ceramic capacitor as close to the ic as possible. when using ceramic capacitors, en sure that they have enough capacitance to provide a sufficient charge to prevent excessive voltage ripple at the input. the input voltage ripple caused by capacitance can be estimated with equation (7) : (7) selecting the output capacitor the output capacitor (c2) stabilizes the dc output voltage. low esr ceramic capacitors are recomm ended to limit the output voltage ripple. estimate the output voltage ripple with equation (8) : (8) where l 1 is the inductor value , and r esr is the equivalent series resistance (esr) value of the output capacitor. when using ceramic capacitors, the capacitance dominates the impedance at the switching frequency and causes most of the output voltage ripple. for simplification, the output voltage ripple can be estimated with equation (9) : (9) for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated with equation (10) : (10) the characteristics of the output c apacitor also affect the stability of the regulation system. pc b layout guidelines efficient layout of the switching power supplies is critical for stable operation . for the high - frequency switching conv erter, poor layout design can result in poor line or load regulation and stability issues. for best results, refer to figure 3 and follow the guidelines below. 1. place the high - current paths (gnd, v in and sw) as close to the device as possible wi th short, direct , and wide traces. 2. place the input capacitor as close to v in and gnd as possible . 3. place the external feedback resistors next to fb . 4. keep the switching node ( sw ) short and away from the feedback network. 5. keep the v out sense line as short as possible or away the from power inductor and surround ing inductor s . figure 3 : two ends of input decoupling capacitor close to pin 2 and pin 3 load out out in in s in i v v v1 f c1 v v ?? ? ? ? ? ? ?? ? ?? out out out esr s 1 in s vv 1 v 1 r f l v 8 f c2 ?? ?? ? ? ? ? ? ? ?? ?? ? ? ? ?? ?? out out out 2 s 1 in vv v1 8 f l c2 v ?? ? ? ? ?? ? ? ? ?? out out out esr in s1 vv v 1 r f l v ?? ? ? ? ? ?? ? ?? l o u t g n d c o u t g n d r 2 v i n v o u t e n c i n 1 2 3 4 5 6 v i n e n o u t f b g n d s w r 1
mp 1601a C 1a , synchronous , step - down converter in a sot563 mp 1601a rev. 1.0 www.monolithicpower.com 16 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits figure 4 : typical application circuit note: v in < 3.3v may require more input capacitor s . m p 1 6 0 1 a g t f g n d f b v i n c 1 n s e n v i n 2 . 3 v t o 5 . 5 v v o u t 1 . 2 v / 1 a s w c 2 1 0 f e n o u t l 1 1 h r 1 2 0 0 k c 1 a 1 0 f c 2 a n s u 1 r 3 k 1 0 0 r 2 2 0 0 k
mp 1601a C 1a , synchronous , step - down converter in a sot563 notice: the information in this document is subject to change without notice. please contact mps for current specifications. users should warrant and guarantee that third party i ntellectual p roperty r ights are n ot infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp 1601a rev. 1.0 www.monolithicpower.com 17 9/2/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information sot563 p a c k a g e o u t l i n e d r a w i n g f o r 6 l s o t 5 6 3 m f - p o - d - 0 2 5 0 r e v i s i o n 1 . 0 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 ) d r a w i n g i s n o t t o s c a l e . t o p v i e w b o t t o m 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 i d e v i e w p i n 1 i d

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