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mp 1605 2a , synchronous , step - down converter with low 11 a quiescent current in sot563 package mp 1605 rev. 1 .0 www.monolithicpower.com 1 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. description the mp 1605 is a monolithic, step - down, switch - mode converter with built - in , internal power mosfets. it achieves 2a of output current from a 2. 3 v to 5.5v input voltage with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. the constant - on - time control scheme provides a fast transient response and eases loop stabilization. full protection features include cycle - by - cycle current limiting and thermal shutdown. the mp 1605 is available in a n ultra - small sot563 package and requires a minimal number of readily available , standard , external components. the mp 1605 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 ? low i q : 11 a ? 2.2mhz switching frequency ? en for power sequencing ? wide 2. 3 v to 5.5v operating input range ? output adjustable from 0.6v ? up to 2a output current ? 120 m? and 80 m? internal power mosfet switches ? output di scharge ? short - circuit protect ion (scp) with hiccup mode ? stable with low esr output ceramic capacitors ? available in a sot563 package ? 100% duty cycle applications ? wireless/networking cards ? portable and mobile devices ? battery - powered devices ? low - voltage i/o system power ? solid - state drives (ssds) 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 registe red trademarks of monolithic power systems, inc. typical application m p 1 6 0 5 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 2 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 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 2 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking mp 1605 gtf sot563 see below * for tape & reel, add suffix C z ( e. g. mp 1605 g tf C z) top marking a ue : product code of mp 1605 g tf y: year code lll : 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 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 3 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. absolute maximum rat ings (1) supply voltage ( v in ) ................................ ....... 6v v sw ................................ ... - 0.3v ( - 5 v for < 20ns ) to 6 v ( 8v for < 20ns or 10v for < 10ns ) all other pins ................................ .... - 0.3v t o 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 t emp . (t j ). .. - 40 c to +125 c thermal resistance ( 4 ) ja jc sot563 ................................ 1 3 0 ...... 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 tempe rature 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 maximum allowable po wer 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) measured on jesd51 - 7, 4 - layer pcb.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 4 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical character istics 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. para meter 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 = - 40 c to + 12 5 c 588 612 feedback current i fb v fb = 0.63v 50 10 0 na p - fet switch on resistance r dson_p 120 m? n - fet switch on resi stance r dson_n 80 m? switch leakage current v en = 0v, v in = 6v , v sw = 0v and 6v , t j = 25 ? c 0 1 a p - fet peak current limit sourcing 2.4 a n - fet valley current limit sourcing, valley current limit 1. 6 a zcd 0 ma on time t on v in = 5v, v out = 1.2v 110 n s v in = 3.6v, v out = 1.2v 150 switching frequency f s v in = 5v, v out = 1.2v, i out = 500ma , t j = 25 c (5) 1760 22 00 2640 khz v in = 5v, v out = 1.2v, i out = 500ma , t j = - 40 c to + 125 c (5) 1650 22 00 2750 khz minimum off ti me t min - off 60 n s minimum o n time ( 5 ) t min - 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 ris ing 2 2. 2 5 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 (quiescen t ) v en = 2v, v fb = 0.63v, v in = 3.6v, 5v , t j = 25 c 11 13 a thermal shutdown (6) 1 6 0 c thermal hysteresis (6) 30 c notes : 5) guaranteed by characterization. 6) guaranteed by design.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 5 6/17/2016 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, t a = +25 c, unless otherwise noted.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 6 6/17/2016 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, t a = +25 c, unless otherwise noted.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 7 6/17/2016 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, t a = +25 c, unless otherwise noted.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 8 6/17/2016 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, t a = +25 c, unless otherwise noted.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 9 6/17/2016 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, t a = +25 c, unless otherwise noted.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 10 6/17/2016 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 1605 operates from a 2. 3 v to 5.5 v unregulated input. a decoupl ing capacitor is required to prevent large voltage spikes from appearing at the input . 4 sw output swit ching node . sw is 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 for the output voltage . connect the load to out . an output capacitor is required to decrease the output voltage ripple.
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 11 6/17/2016 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 c o m p + - 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 h i - z 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 l o - i q v t h
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 12 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mp 1605 uses constant on - time control with input voltage feed - forward to stabilize the switching frequency over the full input range. it achieves 2a of output current from a 2.3v to 5.5v i nput voltage range with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. constan t - o n - time control compare d to fixed frequency pwm control, constant - on - time control offers a simpler control loop and fas ter transient response. by using input voltage feed - forward, the mp 1605 maintains a nearly constant switching frequency across the input and output voltage ranges. the switching pulse on time can be estimated with equation (1) : (1) to prevent inductor current run away during the load transient, the mp 1605 has a fixed minimum off time of 60ns. sleep mode operation the mp 1605 features sleep mode to achieve high efficiency at extreme light - load. in sleep mode, most of the circuit blocks are turned off except for the error amplifier and pwm comparator . the operation current is reduced to a minimal value ( see f igure 2 ) . figure 2 : operation blocks at sleep m ode when the load becomes lighter, the ripple of the output voltage becomes larger and drives the error amplifier output (eao) lower. when the eao reaches the internal low threshold, it is clamped at that level, and the mp 1605 enters sleep mode. during sleep mode, the valley of the fb voltage is regulated to the internal reference voltage . therefore , the average output voltage is slightly higher than the output voltage in dcm or ccm . the on - time pu lse in sleep mode is around 40% larger than that in dcm or ccm . f igure 3 shows the average fb voltage relationship with the internal reference in sleep mode. figure 3 : fb average voltage at sleep mode when th e mp 1605 is in sleep mode, the average output voltage is higher than the internal reference voltage. the eao is kept low and clamped in sleep mode. when the load increases, the pwm switching period decreases to keep the output voltage regul ated , and the output voltage ripple decrease s relatively . once the eao is higher than the internal low threshold, the mp 1605 exits sleep mode and enter s dcm or ccm depending on the load . in dcm or ccm , the error ampl ifier ( ea ) regulates the average output voltage to the internal reference ( see f igure 4 ) . figure 4 : dcm control there is always a loading hysteresis when entering and exiting sleep mode due to the ea clamping response time. aam operation at light - load o peration the mp 1605 uses advanced asynchronous modulation (aam ) power - save mode with z ero - c urrent c ross detect ion ( zc d ) circuit for light lo ad. the mp 1605 uses aam power - save mode for light load. the simplified aam control theory is shown in f igure 5 . the aam current ( i aam ) is set internally. the sw on pulse time is determined by the on - time generator and aam comparator. a t light - load condition, the sw on pulse time is longer . if the aam comparator pulse is longer than the on - time generator, the operation mode is as shown in f igure 6 . out on in v t 0.454 s v ? ? ? b i a s & v o l t a g e r e f e r e n c e 0 . 6 v f b + + - f b c o m p s o f t s t a r t e . a . + - + r a m p g e n e r a t o r s w l o - i q l o - i q f b v r e f a v e r a g e f b f b + r a m p e a o u t a v e r a g e f b = r e f
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 13 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. figure 5 : simplified aam control logic figure 6 : aam c omparator c ontrol t on if the aam comparator pulse is shorter than the on - time generator, the operation mode is as shown in f igure 7 . this usually occurs when using a very small inductance . figure 7 : o n - timer c ont r ol t on the a am circuit has another 150ns of aam blank time in sleep mode. if the on - timer is less than 150ns, the high - side mosfet may turn off af ter the on - time generator pulse without aam control. the on - time pulse at sleep mode is about 40% larger than in dcm or ccm . in this condition, i l may not reach the aam threshold (see f igure 8 ) . figure 8 : aam b lank t ime in s leep m ode the aam threshold decreases as t on increas es (see figure 9) . for ccm state, i out re quires more than half of the aam threshold . figure 9 : aam threshol d decreases as t on i ncreas es the mp 1605 uses a zero - current cross detect circuit (zcd) to determine when the inductor current begins revers ing . when the inductor current reaches the zcd threshold, the low - side switch is turn ed off. aam mode with the zcd circuit make s the mp 1605 work continuously in dcm at light load, even if v out is close to v in . enable (en) when the input voltage is greater than the under - voltage lockout (uvlo ) threshold ( typically 2v ) , the mp 1605 can be enabled by pulling en higher than 1.2v. leaving en float ing or pull ing it down to ground disable s the mp 1605 . there is an internal 1m resistor from en to ground. when the MP1605 is disabled, the part goes into output discharge mode automatically . the internal discharge mosfet provides a resistive discharge path for the output capacitor. s oft s t art (ss) the mp 1605 uses a built - in soft start (ss) th at 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. h s _ d r i v e r v r e f v f b c o t g e n e r a t o r e n i a a m i l _ s e n s e r s q f b c o m p a a m c o m p a a m i o i l b . i n c r e a s e l o a d i n a a m a a m i o i l a . l i g h t l o a d i n a a m a a m i o i l b . i n c r e a s e l o a d i n o n - t i m e r a a m i o i l a . l i g h t l o a d i n o n - t i m e r a a m i o i l 1 5 0 n s 1 5 0 n s
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 14 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. current limit the mp 1605 has a 2.4 a , min imum , high - side , switch - current limit. when the high - side switch reaches its current limit, the mp 1605 remain s in hiccup mode until the current drops. this prevents the inducto r current from continuing to rise and damag ing components. short c ircuit and r ecovery the mp 1605 enter s short - circuit protection (scp) mode when it reaches the current limit and attempts to recover with hiccup mode . the mp 1605 disable s the output power stage, discharge s the soft - start capacitor , and attempts to soft start again automatically . if the short circuit condition remains after the soft start ends, the mp 1605 repeats this cycle unt il the short circuit disappears and the output rises back to regulation level s .
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 15 6/17/2016 mps proprietary 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 figure 1 2 ). selec t the feedback resistor ( r1 ), which reduc es the v out leakage curr ent, typically between 40k to 200k. there is no strict requirement on the feedback resistor. r1 > 10k is reasonable for most application s . r2 can be calculated with equation (2) : (2) figure 10 shows the feedback circuit . figure 10 : feedback network table 1 lists the recommended resistors value 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 1 h to 2.2 h inductor. select an inductor with a dc resistance less than 15m? to optimiz e efficiency. a high - frequency switch - mode power supply with a magnetic device has strong electronic magnetic inference . any un shield ed power inductor s should be avoided . metal al loy or multiplayer chip power inductors are ideal shielded inductors for the application since they can decrease the influence effectively. table 2 lists some recommended inductors. table 2: recommended inductor s manufacturer p/n inductance ( h ) manufacturer pife25201b - 1r0ms 1 .0 cyntec co. ltd. 1239as - h - 1r0m 1 .0 tokyo 744 777 002 2.2 wurth for most designs, the inductance value can be estimated with equa tion (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 vol tage. 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 v oltages 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 5 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 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 16 6/17/2016 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 hal f 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 sufficient charge to prevent excessive voltage ripple at the input. the input voltage ripple caused by cap acitance can be estimated with equation (7) : (7) selecting the output capacitor the output capacitor (c2) stabilizes the dc output voltage. ceramic capacitors are recommended. use low esr capacitors to limi t 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 outpu t capacitor also affect the stability of the regulation system. pc b layout guidelines efficient pcb layout is critical for stable operation. for th e high - frequency switching converter, a poor layout design can result in poor line or load regulation and stability issues. for best results, refer to figure 11 and follow the guidelines below. 1) place the high - current paths (gnd, in , and sw) as c lose to the device as possible with short, direct , and wide traces. 2) keep the input capacitor as close to in and gnd as possible . 3) place the external feedback resistors next to fb . 4) keep the switching node sw sho rt and away from the feedback network. 5) keep the v out sense line as short as possible or keep it away from the power inductor and the surround ing inductor s . figure 11 : t wo 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 1605 C 2a , synchronous , step - down switcher with 11 a iq mp 1605 rev. 1 .0 www.monolithicpower.com 17 6/17/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical application circuits figure 1 2 : typical application circuit for mp 1605 gtf note : v in < 3.3v may require more inp ut capacitor s . m p 1 6 0 5 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 / 2 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 g t f
mp 1605 C 2a , synchronous , step - down switcher with 11 a iq notice: the information in this document is subject to change without notice. please contact mps for c urrent specifications. users should warrant and guarantee that third party i ntellectual p roperty r ights are not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp 1605 rev. 1 .0 www.monolithicpower.com 18 6/17/2016 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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