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mpq2143 - a ec1 3a, 5.5 v, 1.2mhz, 40 a i q , cot synchronous step - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 1 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. description the mpq2143 is a monolithic , step - down , switch - mode converter with internal power mosfets. it can achieve up to 3a continuous output current from a 2.5v C to - 5.5 v input voltage with exce llent load and line regulation. the output voltage can be re gulated as low as 0.6v. constant - on - time control provides fast transient response and eases loop stabilization. fault - condition protection s include cycle - by - cycle current limiting and thermal shutdown. the mpq2143 is available in small tsot 23 - 8 package an d requires only a minim al number of readily - available standard external components . the mpq2143 is ideal for a wide range of applications including high - performance dsps, fpgas, smartphones , portable instruments , and dvd drivers. features ? guaranteed indu strial/automotive temp ? wide 2.5v - to - 5.5 v operating input range ? output voltage as low as 0.6v ? 100% duty cycle in dropout ? up to 3a output current ? low i q : 40 a ? 8 0 m ? and 4 0 m ? internal power mosfet switches ? d efault 1.2 mhz switching frequency ? en and power - good for power sequencing ? cycle - by - cycle over - current protection ? auto discharge at power off ? short - circuit protect with hiccup mode ? stable with low - esr output ceramic capacitors ? available in a tsot 23 - 8 package ? available in aec - q100 grade 1 applications ? low v oltage i/o system power ? handheld/battery - powered systems ? wireless/networking cards all mps parts are lead - free, halogen free, and adhere to the rohs directive. for mps green status, please visit mps website under quality assurance. mps and the future of analog ic technology are registered trademarks of monolithic power systems, inc. typical application mpq2143
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 2 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. ordering information part number package top mar king mpq2143 dj * tsot23 - 8 ace mpq2143 dj - aec1 * * tsot23 - 8 ace * f or tape & reel, add suffix C z ( e . g. mpq2143 dj C z) ; for rohs compliant packaging, add suffix C lf (e . g. mpq2143 dj C lf C z) package reference sot23 - 8 absolute maximum rat ings (1) supply voltage v in ................................ ......... 6 v v sw ....................... ( - 3 v for < 5 ns) to ( v in +0.3v ) all other pins ................................ - 0.3v to + 6 v junction temperature .............................. 150 c lead temperature ................................ ... 260 c continuous power dissipation (t a = 25 c) (2) ... ................................ ............... 1. 25 w storage temperature ............... - 65 c to +150 c recommended operating conditions ( 3 ) su pply voltage v in ......................... 2.5 v to 5.5 v output voltage v out ................. 0.6v to v in - 0 . 5 v operating junction temp . (t j ). - 40 c to +125 c thermal resistance ( 4 ) ja jc tsot 23 - 8 ............................. 10 0 ..... 55 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the maximum allowable power dissip ation is a function of the maximum 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 maximum 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. 3) the device is not guarant eed to function outside of its operating conditions. 4) measured on jesd51 - 7, 4 - layer pcb.
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 3 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. electrical character istics ( 5 ) v in = 5 v, t j = 40 c to + 1 25 c , typical values are at t j =+25 c , unless otherwise noted. parameter symbol condition min typ max units f eedback voltage v fb 2.5v v in 5.5 v - 1.5% 0.600 +1.5% v /% t j = - 4 0 o c to + 12 5 o c - 2% +2% feedback current i f b v fb = 0.6 3 v 10 na pfet switch on resistance r dson_p 65 m? nfet switch on resistance r dson_n 4 0 m? switch leakage v en = 0v, v in = 5v , t j =+25 c 0.1 2 a t j = - 40 c to +125 c 35 pfet current limit t j =+25 c 4.2 4.8 a t j = - 40 c to +125 c 4.0 nfet switch sinking current i nsw v out =1.2v, v fb =0.7v 100 a on time t on v in =5v, v out =1.2v 200 ns v in =3.6v, v out =1.2v 277 switching frequency f s v in = 5v, v out =1.2v , i out =1 a - 20% 1200 +20% khz t j = - 4 0 o c to + 12 5 o c - 25% 1200 +25% khz minimum off time t min - off 50 n s soft - start time t ss - on 1.3 m s soft - stop time t ss - off 1 m s power - good upper trip threshold pg h fb voltage respect to the regulati on +10% % power - good lower trip threshold pg l - 10% % power - good delay pg d 110 s power - good sink current capability v pg - l sink 1 ma 0.4 v power - good logic high voltage v pg - h v in =5v, v fb =0.6v , t j =+25 c 4.9 v t j = - 40 c to +125 c 4.85 power - good internal pull - up resistor r pg 500 k? under - voltage lockout threshold rising 2. 0 2. 2 2.4 v under - voltage lockout threshold hysteresis 150 m v en input logic low voltage 0.4 v en input logic high voltage 1.2 v
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 4 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. electrical character istics ( 5 ) (continued) v in = 5v, t j = 40 c to + 1 25 c, typical values are at t j =+25 c , unless otherwise noted. parameter symbol condition min typ max units en input current v en =2v 2 a v en =0v 0 .1 a supply current (shutdown) v en =0v 0 .1 a supply current (quiescent) v en =2v, v fb =0.63v, v in =3.6v 40 a thermal shutdown 150 c thermal hysteresis 30 c notes: 5) guaranteed by design.
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 5 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. typical performance characteristics v in = 5 v, v out = 1.2v, l = 1.0 h, c out =22 f, t a = 25 c, unless otherwise noted.
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 6 5/24/2016 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 = 1.0 h, c out =22 f, t a = 25 c, unless otherwise noted
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 7 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. . typical performance characteristics (con tinued) v in = 5v, v out = 1.2v, l = 1.0h, c out =22 f, t a = 25 c, unless otherwise noted.
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 8 5/24/2016 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 =22 f, t a = 25 c, unless otherwise noted.
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 9 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. pin functions tsot23 pin # name description 1 pg power - good indicator. the pin output is an open drain that connects to vin by an internal pull - up resistor. pg is pulled up to v in when the fb voltage is within 10% of the regulation level . if fb voltage is out of that regulation range, it is low. 2 vin supply voltage. the mpq2143 operates from a 2.5v - to - 5.5 v unregulated input. c1 prevent s large voltage spikes from appearing at the input. 3 sw switch output 4 pgnd power ground 5 out input sense. for output voltage feedback 6 agnd an alog ground . reference for the internal control circuit . 7 fb feedback pin. connect an external resistor divider from the output to gnd to set the output voltage. 8 en on/off control
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 10 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. functional 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 / o f f p g n d o u t p w m c o m p + - c o m p + - 0 . 6 6 v 0 . 5 4 v a g n d p g h i - z f b f o r f i x e d o u t p u t i n 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
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 11 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. operation the mpq2143 uses constant on - time control with input - voltage feed - forward to stabilize the switching frequency over its full input range. at light load, the mpq2143 employs a proprietary control over the low - side mosfet (ls - fet) and inductor current to eliminate ringing on switching node and to improve efficiency . constant o n - time control when compare d to fixed - frequency pwm control, constant on - time control offers a simpler control loop and faster tr ansient response. by using input - voltage feed - forward, the mpq2143 maintains a nearly constant switching frequency across the entire input and output voltage range. the switching pulse on time can be estimated as: to prevent inducto r current runaway during the load transient, the mpq2143 has a fixed minimum off time of 5 0ns. however, this minimum off time limit does not affect the operation of the mpq2143 in steady state in any way. light load o peration in light load condition, the m pq2143 uses a proprietary control scheme to save power and improve efficiency : it gradually ramps down the ls - fet current to its minimum instead of turning off the ls - fet immediately when the inductor current start s to reverse . the gradual current drop avo ids ringing at the switching node that always occurs in discontinuous conduction mode (dcm) operation . e na ble when the input voltage exceeds the under - voltage lockout (uvlo) threshold typically 2. 2 v the mpq2143 is enabled by pulling the en pin above 1.2v. leaving the en pin float ing or ground ed will disable the mpq2143 . there is an internal 1m? resistor from the en pin to ground. s oft - s t art/s top mpq2143 has a built - in soft - start that ramps up the output voltage at a constant slew rate that avoid s overshoot ing at startup. the soft - start time is typically about 1 ms. when disable d , the mpq2143 ramps down the internal reference voltage to allow the load to linearly discharge the output. power good i ndictor mpq2143 has an open drain with 500k pull - up resistor pin for power good (pg) indicat ion . when the fb pin is within 10% of regulation voltag e ( 0.6v ) , the p g pin is pulled up to v in by the internal resistor. if the fb pin voltage is out side the 10% window, the pg pin is pulled to ground by an internal mosfet. the mosfet has a maximum r dson of less than 100 ? . current limit the mpq2143 has a 4.8 a current limit for the high side switch (hs - fet) . when the hs - fet hits its current limit, the mpq2143 enters hiccup mode until the current drops to prevent the inductor current from build ing and possibly damag ing the components. short c ircuit and r ecover y the mpq2143 also enters short - circuit protection (scp) mode when it hits the current limit , and tries to recover from the short circuit by entering hiccup mode. in scp , the mpq2143 disable s the output power stage, discharge s a soft - start cap acitor, and then enacts a soft - start procedure . if the short - circuit condition still holds after soft - start ends, the mpq2143 repeats this operation until the short circuit ceases and output rises back to regulation level. out on in v t 0.833 s v ? ? ?
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 12 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. application informat ion component selectio n setting the output voltage the external resistor divider set s the output voltage (see the typical application schematic on page 1). the feedback resistor r1 must account for both stability and dynamic response, and thus can not be too large or too small. choose an r1 value between 1 20 k and 200k . r2 is then given by: the feedback circuit is shown as figure 2 . figure 2 : feedback network table 1 lists the recommended resistors value s for common output voltages. table 1 : resistor values for common output voltages v out (v) r1 (k ? ?) 1.0 200 (1%) 300 (1%) 1.2 200 (1%) 20 0 (1%) 1.8 200 (1%) 100 (1%) 2.5 200 (1%) 63.2 ( 1%) 3.3 200 (1%) 44.2 (1%) selecting the inductor a 0.82 h to 4.7 h inductor is recommended for most applications. for highest efficiency, chose an inductor with a dc resistance less than 15m ? . for most designs, the inductance value can be derived from the following equation. where i l is the inductor ripple current. choose an inductor current to be approximately 30% o f the maximum load current . the maximum inductor peak current is: selecting the input capac itor the input current to the step - down converter is discontinuous, and requires a capacitor to supply the ac current to the step - down converter while maintaining the dc input voltage. use low - esr capacitors for the best performance. ceramic capacitors wit h x5r or x7r dielectrics are highly recommended because of their low esr values and small temperature coefficients. for most applications, a 10 f capacitor is sufficient. for higher output voltage, use 47 f to improve system stability . since the input capacitor absorbs the input switching current it requires an adequate ripple current rating. the rms current in the input capacitor can be estimated by: the worse case condition occurs at vin = 2v out , where: for simplification, choose an input capacitor whose rms current rating greater than half of the maximum load current. the input capacitor can be electrolytic, tantalum or ceramic. when using electrolytic or t antalum capacitors, use a small high - quality ceramic capacitor ( 0.1f ) , placed as close to the ic as possible. when using ceramic capacitors, make sure that they have enough c apacitance to prevent excessive voltage ripple at input. the input voltage ripple caused by capacitance can be estimated by: out r1 r2 v 1 0.6 ? ? out in out 1 in l osc v (v v ) l v i f ?? ? ? ? ? l l(max) load i ii 2 ? ?? ? ? ? ? ? ? ? ? ? ? ? ? in out in out load 1 c v v 1 v v i i 2 i i load 1 c ? load out out in in s in i v v v1 f c1 v v ?? ? ? ? ? ? ?? ? ??
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 13 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. selecting the output capacitor the output capacitor (c2) maintain s the output dc voltage. use ceramic capacitors. low - esr capacitors keep the output voltage ripple low. the output voltage ripple can be estimated by: where l 1 is the inductor value and r esr is the equivalent series resistance of the output capacitor. using ceramic capacitors, the impedance at the switching frequency is dominated by the capacitance. t he output voltage ripple is mainly caused by the capacitance. for simplification, the output voltage ripple can be estimated by: for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. fo r simplification, the output ripple can be approximated as : the characteristics of the output capacitor also affect the stability of the regulation system. pc b recommendation of mpq2143 proper layout of the switching power supplies is very important, and sometimes critical for proper operation . for high - frequency switching converter s , poor layout could lead to poor line or load regulation and stability issues. the high current paths (gnd, in , and sw) should be placed very close to t he device using short, direct , and wide traces. the input capacitor needs to be as close as possible to the in and gnd pins. the external feedback resistors should be placed next to the fb pin. keep the switching node sw short and away from the feedback ne twork . figure 3 : layout r ecommendation out out out esr s 1 in s vv 1 v 1 r f l v 8 f c2 ?? ?? ? ? ? ? ? ? ?? ?? ? ? ? ?? ?? out out out 2 in s1 vv v 1 v 8 f l c2 ?? ? ? ? ?? ? ? ? ?? out out out esr in s1 vv v 1 r f l v ?? ? ? ? ? ?? ? ?? 8 7 6 5 l 1 c 2 c 2 a r 1 r 4 r 3 r 2 1 2 3 4 o u t v i n g n d s w c 1 c 1 a
mpq2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified mpq2143 rev. 1.0 www.monolithicpower.com 14 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 mps . all rights reserved. typical application circuits figure 4 : mpq2143 t ypical application circuit mpq2143
mpq 2143 C 3a, 5.5 v, 1.2mh z , 40 a i q , cot synchronous st ep - down switcher aec - q100 qualified 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 not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mpq2143 rev. 1.0 www.monolithicpower.com 15 5/24/2016 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2016 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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