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mp2143 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step down switcher mp2143 rev. 1.07 www.monolithicpower.com 1 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. the future of analog ic technology description the mp2143 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?to-5.5v input voltage with excellent load and line regulation. the output voltage can be regulated as low as 0.6v. constant-on-time control provides fast transient response and eases loop stabilization. fault- condition protections include cycle-by-cycle current limiting and thermal shutdown. the mp2143 is available in small tsot23-8 package and requires only a minimal number of readily-available standard external components. the mp2143 is ideal for a wide range of applications including high-performance dsps, fpgas, smartphones, portable instruments, and dvd drivers. features ? wide 2.5v-to-5.5v operating input range ? output voltage as low as 0.6v ? 100% duty cycle in dropout ? up to 3a output current ? low i q : 40a ? 80m ? and 40m ? internal power mosfet switches ? default 1.2mhz 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 tsot23-8 package applications ? low voltage 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 qualit y assurance. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application mp2143 pgnd agnd fb vin c1 10 f en vin 2.5v to 5.5v vout 1.2v/2a sw c2 10 f r1 200k r2 200k pg en pg out l1 1 h 2 8 1 4 6 7 5 3
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 2 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. ordering information part number* package top marking mp2143dj tsot23-8 see below * for tape & reel, add suffix ?z (e.g. mp2143dj?z); for rohs compliant packaging, add suffix ?lf (e.g. mp2143dj?lf?z) top marking ace: product code of mp2143dj; y: year code; package reference top view 4 3 2 1 8 7 6 5 pg vin sw pgnd en fb agnd out sot23-8 absolute maxi mum ratings (1) supply voltage v in ......................................... 6v v sw ...................................................................... -0.3v (-5v for < 10ns) to v in +0.3v (10v for <10ns) all other pins .................................-0.3v to +6 v junction temperature ...............................150c lead temperature ....................................260c continuous power dissipation (t a = 25c) (2) ???.?.. ............................................... 1.25w storage temperature............... -65c to +150c recommended operating conditions (3) supply voltage v in ..........................2.5v to 5.5v output voltage v out ................. 0.6v to v in -0.5v operating junction temp. (t j ). -40c to +125c thermal resistance (4) ja jc tsot23-8.............................. 100 ..... 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), the 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 powe r 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 guaranteed to function outside of its operating conditions. 4) measured on jesd51-7, 4-layer pcb.
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 3 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics ( 5) v in = 5v, t a = 25c, unless otherwise noted. parameter symbol condition min typ max units 2.5v v in 5.5v -1.5% 0.600 +1.5% feedback voltage v fb t a =-40 o c to +85 o c -2% +2% v/% feedback current i fb v fb = 0.63v 10 na pfet switch on resistance r dson_p 80 m ? nfet switch on resistance r dson_n 40 m ? switch leakage v en = 0v, v in = 5v v sw = 0v and 5v 0.1 2 a pfet current limit 4.2 4.8 a nfet switch sinking current i nsw v out =1.2v, v fb =0.7v 100 a v in =5v, v out =1.2v 200 on time t on v in =3.6v, v out =1.2v 277 ns v in =5v, v out =1.2v, i out =1a -20% 1200 +20% khz switching frequency f s t a =-40 o c to +85 o c -25% 1200 +25% khz minimum off time t min-off 50 ns soft-start time t ss-on 1.3 ms soft-stop time t ss-off 1 ms power-good upper trip threshold pg h fb voltage respect to the regulation +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 1ma 0.4 v power-good logic high voltage v pg-h v in =5v, v fb =0.6v 4.9 v 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 mv en input logic low voltage 0.4 v en input logic high voltage 1.2 v v en =2v 2 a en input current v en =0v 0.1 a
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 4 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. electrical characteristics ( 5) (continued) v in = 5v, t a = 25c, unless otherwise noted. parameter symbol condition min typ max units 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.
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 5 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics v in = 5v, v out = 1.2v, l = 1.0h, c out =22f, t a = 25c, unless otherwise noted. 0.01 0.1 1 10 0.001 0.01 0.1 1 10 2 2.5 3 3.5 4 4.5 5 5.5 6 0 2 2.5 3 3.5 4 4.5 5 5.5 6 0 0.5 1 1.5 2 2.5 3 3.5 error -0.60% -0.40% -0.20% 0.00% 0.20% 0.40% 0.60% 2.0 3.0 4.0 5.0 6.0 0 10 20 30 40 50 60 70 80 0 0.5 1 1.5 2 2.5 3 3.5 4
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 6 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, c out =22f, t a = 25c, unless otherwise noted v out 50.0mv/div. v sw 2.00v/div. i l 1.00a/div. output ripple i out =0a v out 10.0mv/div. v sw 2.00v/div. i l 1.00a/div. v out 10.0mv/div. v sw 2.00v/div. i l 2.00a/div. v out 100mv/div. v sw 5.00v/div. i l 2.00a/div. v out 20.0mv/div. v sw 5.00v/div. i l 2.00a/div. v out 500mv/div. v sw 5.00v/div. v in 5.00v/div. i l 2.00a/div. v out 500mv/div. v sw 5.00v/div. v in 5.00v/div. i l 2.00a/div. v out 500mv/div. v sw 2.00v/div. v in 2.00v/div. v out 500mv/div. v sw 2.00v/div. v in 2.00v/div. i l 2.00a/div. output ripple i out =1a output ripple i out =3a output ripple v in = 6v, v out = 0.6v, i out =0a output ripple v in = 6v, v out = 0.6v, i out =3a vin power up without load vin power up with 3a load vin shut down without load vin shut down with 3a load
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 7 7/4/2016 mps proprietary information. patent protec ted. 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 =22f, t a = 25c, unless otherwise noted. v out 500mv/div. v sw 5.00v/div. v en 2.00v/div. i l 2.00a/div. en start up without load en start up with 3a load en shut down without load en shut down with 3a load power good on without load power good on with 3a load power good off without load power good off with 3a load load transient response v out 500mv/div. v sw 5.00v/div. v en 2.00v/div. i l 2.00a/div. v out 500mv/div. v sw 5.00v/div. v en 2.00v/div. i l 1.00a/div. v out 500mv/div. v sw 2.00v/div. v en 2.00v/div. i l 2.00a/div. v out 1.00v/div. v sw 5.00v/div. v pg 5.00v/div. i l 1.00a/div. v out 500mv/div. v sw 5.00v/div. v pg 5.00v/div. i l 2.00a/div. v out 1.00v/div. v sw 5.00v/div. v pg 5.00v/div. i l 1.00a/div. v out 500mv/div. v sw 5.00v/div. v pg 5.00v/div. i l 2.00a/div. v out /ac 20.0mv/div. v sw 5.00v/div. i l 2.00a/div.
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 8 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. typical performanc e characteristics (continued) v in = 5v, v out = 1.2v, l = 1.0h, c out =22f, t a = 25c, unless otherwise noted. v out 1.00v/div. v sw 5.00v/div. i l 5.00a/div. short circuit entry v in = 6v short circuit v in = 6v short circuit recovery v in = 6v v out 1.00v/div. v sw 5.00v/div. i l 5.00a/div. v out 1.00v/div. v sw 5.00v/div. i l 5.00a/div.
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 9 7/4/2016 mps proprietary information. patent protec ted. 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 dr ain that connects to vin by an internal pull-up resistor. pg is pulled up to vin 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 mp2143 operates from a 2.5v-to-5.5v unregulated input. c1 prevents 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 analog ground. reference for the internal control circuit. 7 fb feedback pin. connect an external resistor di vider from the output to agnd to set the output voltage. 8 en on/off control
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 10 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. functional block diagram main switch (pch) synchronous rectifier (nch) constant on -time pulse pw m bias & voltage reference 0.6 v en fb sw comp + - vin + + - fbcomp en driver pdrv ndrv soft start pgnd agnd out pw m comp + - comp + - 0. 66 v 0. 54 v pg hi-z fb for fixed output vin e.a. + - + ramp gener ator comp + - vout rst sw lo -iq lo-iq lo-iq lo-iq lo-iq v th figure 1: functional block diagram
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 11 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. operation the mp2143 uses constant on-time control with input-voltage feed-forward to stabilize the switching frequency over its full input range. at light load, the mp2143 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 on-time control when compared to fixed-frequency pwm control, constant on-time control offers a simpler control loop and faster transient response. by using input-voltage feed-forward, the mp2143 maintains a nearly constant switching frequency across the entire input and output voltage range. the switching pulse on time can be estimated as: out on in v t0.833s v ?? ? to prevent inductor current runaway during the load transient, the mp2143 has a fixed minimum off time of 50ns. however, this minimum off time limit does not affect the operation of the mp2143 in steady state in any way. light load operation in light load condition, the mp2143 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 starts to reverse. the gradual current drop avoids ringing at the switching node that always occurs in discontinuous conduction mode (dcm) operation. considering the internal circuit propagation time, the typical delay is 50ns. it means the inductor current still fall after the zcd is trigger in this delay. if the inductor current falling slew rate is fast (vout voltage is high or close to vin), the low side mosfet is turned off and inductor current may be negative. this phenomena will cause mp2143 can not enter dcm operation. if the dcm mode is required, the off time of low side mosfet in ccm should be longer than 100ns. for example, vin is 3.6v and vo is 3.3v, the off time in ccm is 50ns. it is difficult to enter dcm at light load. and using smaller inductor can improve it and make it enter dcm easily. enable when the input voltage exceeds the under- voltage lockout (uvlo) threshold?typically 2.2v?the mp2143 is enabled by pulling the en pin above 1.2v. leaving the en pin floating or grounded will disable the mp2143. there is an internal 1m ? resistor from the en pin to ground. soft-start/stop mp2143 has a built-in soft-start that ramps up the output voltage at a constant slew rate that avoids overshooting at startup. the soft-start time is typically about 1ms. when disabled, the mp2143 ramps down the internal reference voltage to allow the load to linearly discharge the output. power good indicator mp2143 has an open drain with 500k ? pull-up resistor pin for power good (pg) indication. when the fb pin is within 10% of regulation voltage (0.6v), the pg pin is pulled up to vin by the internal resistor. if the fb pin voltage is outside 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 mp2143 has a 4.8a current limit for the high side switch (hs-fet). when the hs-fet hits its current limit, the mp2143 enters hiccup mode until the current drops to prevent the inductor current from building and possibly damaging the components. short circuit and recovery the mp2143 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 mp2143 disables the output power stage, discharges a soft-start capacitor, and then enacts a soft-start procedure. if the short-circuit condition still holds after soft-start ends, the mp2143 repeats this operation until the short circuit ceases and output rises back to regulation level.
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 12 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. application information component selection setting the output voltage the external resistor divider sets 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 120k ? and 200k ? . r2 is then given by: out r1 r2 v 1 0.6 ? ? the feedback circuit is shown as figure 2. r1 r2 vout fb mp2143 figure 2: feedback network table 1 lists the recommended resistors values 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 a 0.82h to 4.7h 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. out in out 1 in l osc v(vv) l vif ?? ? ?? ? where i l is the inductor ripple current. choose an inductor current to be approximately 30% of the maximum load current. the maximum inductor peak current is: l l(max) load i ii 2 ? ?? selecting the input capacitor 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 with x5r or x7r dielectrics are highly recommended because of their low esr values and small temperature coefficients. for most applications, a 10f 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: ? ? ? ? ? ? ? ? ? ? ? ? in out in out load 1 c v v 1 v v i i the worse case condition occurs at vin = 2v out , where: 2 i i load 1 c ? 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 tantalum capacitors, use a small high-quality ceramic capacitor (0.1 f), placed as close to the ic as possible. when using ceramic capacitors, make sure that they have enough capacitance to prevent excessive voltage ripple at input. the input voltage ripple caused by capacitance can be estimated by: load out out in in sin iv v v1 fc1v v ?? ?? ? ?? ?? ? ??
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher mp2143 rev. 1.07 www.monolithicpower.com 13 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. selecting the output capacitor the output capacitor (c2) maintains the output dc voltage. use ceramic capacitors. low-esr capacitors keep the output voltage ripple low. the output voltage ripple can be estimated by: out out out esr s1 in s vv 1 v1r fl v 8fc2 ?? ?? ?? ?? ? ? ?? ?? ??? ?? ?? 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. the output voltage ripple is mainly caused by the capacitance. for simplification, the output voltage ripple can be estimated by: out out out 2 in s1 vv v1 v 8f l c2 ?? ??? ?? ??? ?? for tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated as: out out out esr in s1 vv v1r fl v ?? ???? ?? ? ?? the characteristics of the output capacitor also affect the stability of the regulation system. pcb recommendation of mp2143 proper layout of the switching power supplies is very important, and sometimes critical for proper operation. for high-frequency switching converters, poor layout could lead to poor line or load regulation and stability issues. the high current paths (gnd, vin, and sw) should be placed very close to the device using short, direct, and wide traces. the input capacitor needs to be as close as possible to the vin 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 network. 8 7 6 5 l1 c 2 c 2 a r 1 r 4 r 3 r 2 1 2 3 4 out vin gnd sw c1 c1a figure 3: layout recommendation typical application circuits mp2143 vin 2.5-5.5v r3 100k r2 200k r1 200k r4 499k u1 sw vout gnd c2a ns 1206 in en pg pgnd agnd fb out sw 2 8 1 46 7 5 3 gnd en pg vin figure 4: mp2143 typical application circuit
mp2143 ? 3a, 5.5v, 1.2mhz, 40 a i q , cot synchronous step-down switcher notice: the information in this document is subject to change wi thout notice. please contact m ps for current specifications. users should warrant and guarantee that third party intellectual property rights ar e not infringed upon when integrating mps products into any application. mps will not assume any legal responsibility for any said applications. mp2143 rev. 1.07 www.monolithicpower.com 14 7/4/2016 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2016 mps. all rights reserved. package information tsot23-8

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