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MP2113 1.5a synchronous step-down converter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 1 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. the future of analog ic technology description the MP2113 is a fully integrated, internally compensated 1.5mhz fixed frequency pwm step-down converter with dynamic output voltage control. user can select two operation modes, forced pwm and asynchronous mode. force pwm is ideal for high load operation while asynchronous mode improves efficiency at light load condition. each mode has independent output level that can be set by the user to optimize the power efficiency. it is ideal for powering portable equipment that runs from a single cell lithium-ion (li+) battery, with an input range from 2.7v to 6v. the MP2113 can provide 1.5a of load current in forced pwm mode and 50ma in asynchronous mode. both output voltage can be regulated to as low as 0.6v. MP2113 integrates the high side switch, a synchronous rectifier for forced pwm mode and a schottky diode for asynchronous mode operation. with peak current mode control and internal compensation, the MP2113 is stable with ceramic capacitors and small inductors. fault condition protection includes cycle-by- cycle current limiting and thermal shutdown. MP2113 is available in the small 8-pin 2mmx3mm qfn package. features ? user selectable operation mode: forced pwm and asynchronous mode ? user programmable output level for each operation mode ? dynamic output voltage control ? up to 1.5a output current for forced pwm mode, 50ma for asynchronous mode ? internal power mosfet switches and schottky diode ? stable with low esr output ceramic capacitors ? up to 95% efficiency ? 1a shutdown current. ? 1.5mhz switching frequency ? thermal shutdown ? cycle-by-cycle over current protection ? short circuit protection ? power-good output ? 2.7-6v input operation range ? output adjustable from 0.6v to vin ? available in 8-pin 2x3mm qfn package applications ? dvd+/-rw drives ? smart phones ? pdas ? digital cameras ? portable instruments ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application MP2113 fb drn en gnd in 2.7-6v 1.8v/1.5a v in v out sw pgood ctrl c in 4.7uf c out 22uf r3 200k r2 604k r1 301k l1 2.2uh r4 500k efficiency vs. load current 60 65 70 75 80 85 90 95 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 load current(a) efficiency(%) vin=3v vin=5v vin=6v
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 2 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package reference top view fb pgood gnd sw 1 2 3 4 drn en ctrl in 8 7 6 5 exposed pad on backside, connect to gnd part number* package MP2113dd qfn8 (2mm x 3mm) temperature top marking ?40 c to +85 c MP2113ds * for tape & reel, add suffix ?z (eg. MP2113dd?z) for rohs compliant packaging, add suffix ?lf (eg. MP2113dd?lf?z) absolute maxi mum ratings (1) in to gnd .................................. ?0.3v to + 6.5v sw to gnd .......................... ?0.3v to v in + 0.3v pgood, en, ctrl to gnd ....... ?0.3v to +6.5v fb, drn to gnd ........................ ?0.3v to +6.5v operating temperature ............. ?40c to +85c junction temperature ............................... 150c lead temperature .................................... 260c storage temperature ............. ?65c to +150c recommended operating conditions (2) supply voltage v in ............................. 2.7v to 6v operating temperature ............. ?40c to +85c thermal resistance (3) ja jc qfn8 (2mm x 3mm) ............... 50 ...... 12 ... c/w notes: 1) exceeding these ratings may damage the device. 2) the device is not guaranteed to function outside of its operating conditions. 3) measured on jesd51-7, 4-layer pcb. electrical characteristics (4) v in = v en = 3.6v, t a = +25 c, unless otherwise noted. parameters condition min typ max units supply current v en_ = v in , v ctrl_ =v in (forced pwm mode) 500 650 a v en_ = v in , v ctrl_ =0 (asynchronous mode) 55 85 shutdown current v en =0v, v in =6v 0.1 1 a thermal shutdown trip threshol d hysteresis=20c 145 c pgood upper trip threshold fb wrt the nominal value 12 % pgood lower trip threshold fb wrt the nominal value -10 % pgood output lower voltage isink=1ma 0.3 v pgood deglitch timer transient deglitch 200 s en trip high threshold 1.5 v en trip low threshold 0.5 v en input control v en =0v 0.1 1.0 a v en =6v 6 a ctrl trip threshold rising edge, vin-0.8v 1.8 v falling edge gnd 0.4 v ctrl input current v en =0v to 6v -1 0.1 1 a drn output resistance ctrl=v in 100 ? ctrl=0 10 m ?
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 3 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. electrical characteristics (continued) (4) v in = v en = 3.6v, t a = +25 c, unless otherwise noted. parameters condition min typ max units in undervoltage lockout threshold rising edge 2.40 2.65 v in undervoltage lockout hysteresis 160 mv regulated fb voltage t a =+25c 0.588 0.600 0.612 v -40c t a +85c 0.582 0.600 0.618 regulated fb voltage hysteresis ctrl = 0 (async mode) 12 20 mv fb input bias current v fb =0.7v -50 -2 +50 na sw pfet on resistance i sw =100ma 0.25 ? sw nfet on resistance i sw =-100ma 0.19 ? sw schottky diode forward voltage i sw = -50ma -0.5 v sw pfet leakage current v en =0v; v in =6v; v sw =0v -1 0.1 1 a sw nfet leakage current v en =0v; v in =6v; v sw =6v -5 1.5 5 a sw pfet peak current limit duty cycle=100%, current pulse width <1ms 1.7 2.2 a oscillator frequency 1.3 1.5 1.7 mhz note: 4) production test at +25c. specificat ions over the temperature range are guaranteed by design and characterization. pin functions pin # name description 1 fb feedback input. 2 pgood power-good indicator output. ?open-drain? output indicating that the output is within 10% of the final regulation value. ?low? output indicates output is more than 10% lower than regulation level. pgood is pulled down in shutdown. pgood comparator shall have 200us deglitch timer to avoid false trigger during transition of operation modes. 3 gnd ground pin. 4 sw switch node to the inductor. 5 in input supply pin. 6 ctrl input to control the operation mode. ?high? set MP2113 in forced pwm mode, drn=low (pull down) and ?low? sets MP2113 in low power asynchronous mode, drn=high. ctrl is pulled up to vin with 1ua current. 7 en enable input, ?high? enables MP2113. en is pulled to gnd with 1meg internal resistor. 8 drn drain output of an internal switch, controlled by ctrl input. drn is open circuit when ctrl is ?low?, and drn is pulled to ground with on resistance less than 100ohm when ctrl is ?high?.
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 4 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics v in = 6v, v out = 1.8v, l=2.2uh, t a = +25oc, pwm mode, unless otherwise noted. enabled supply current vs. input voltage 0 100 200 300 400 500 600 2.5 3 3.5 4 4.5 5 5.5 6 input voltage(v) enabled supply current(ua) input voltage(v) disabled supply current (ua) disabled supply current vs. input voltage case temperature rise vs. output current 0 5 10 15 20 25 30 0.25 0.5 0.75 1 1.25 1.5 output current(a) 0.1 1 10 23 4 5 6 7 input voltage (v) output voltage (v) operating range load regulation peak current vs. duty duty cycle(%) peak current(a) 2 2.5 3 3.5 4 4.5 25 35 45 55 65 75 85 95 line regulation 3 3.5 4 4.5 5 5.5 6 input voltage (v) line regulation -30 0 30 60 90 120 150 180 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 -0.50% -0.40% -0.30% -0.20% -0.10% 0.00% 0.10% 0.20% 0.30% 0 0.4 0.8 1.2 1.6 output current (a) load regulation vin=3v vin=6v vin=5v -0.50% -0.40% -0.30% -0.20% -0.10% 0.00% 0.10% 0.20% 0.30% 0.40% io=1.5a io=1a io=0a pwm mode asyn mode efficiency vs. load current 60 65 70 75 80 85 90 95 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 load current(a) efficiency(%) vin=3v vin=5v vin=6v
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 5 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics (continued) v in = 6v, v out = 1.8v, l=2.2uh, t a = +25oc, pwm mode, unless otherwise noted. load transient response load: 0.75a--1.5a, slew rate: 1a/us 100us/div 10us/div output short i out =1.5a enable startup no load enable startup i out =1.5a input ripple voltage i out =1.5a v out 1v/div v sw 5v/div pg 2v/div i inductor 2a/div v out 1v/div en 5v/div pg 2v/div i inductor 1a/div 100us/div v out 1v/div en 5v/div pg 2v/div i inductor 1a/div 100us/div power up no load v out 1v/div v in 5v/div pg 2v/div i inductor 1a/div power up i out =1.5a v out 1v/div v in 5v/div pg 2v/div i inductor 1a/div 100us/div v in 10mv/div v sw 5v/div 200ns/div output ripple voltage i out =1.5a v out 10mv/div v sw 5v/div i inductor 1a/div 200ns/div v out 20mv/div i out 500ma/div 400us/div v out 1v/div 200us/div pg 2v/div i inductor 1a/div v sw 5v/div short recovery i out =1.5a
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 6 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics (continued) v in = 6v, v out = 1.8v, l=2.2uh, t a = +25oc, pwm mode, unless otherwise noted. 100us/div 200us/div 20us/div v out 500mv/div v sw 5v/div pg 1v/div i inductor 2a/div v out 500mv/div v sw 5v/div pg 1v/div i inductor 2a/div v out 500mv/div en 5v/div pg 1v/div i inductor 500ma/div 100us/div en 5v/div pg 1v/div 100us/div v out 500mv/div v in 5v/div pg 1v/div i inductor 500ma/div v out 500mv/div v in 5v/div pg 1v/div i inductor 500ma/div 100us/div v out 20mv/div v sw 500mv/div 100ms/div v out 20mv/div v sw 5v/div i inductor 500ma/div 10us/div v out 500mv/div v sw 5v/div i inductor 2a/div 4us/div output short for asyn mode v out =0.9v, i out =50ma enable startup for asyn mode v out =0.9v, no load power up for asyn mode v out =0.9v, no load enable startup for asyn mode i out =50ma, v out =0.9v v out 500mv/div i inductor 500ma/div power up for asyn mode i out =50ma, v out =0.9v output ripple voltage for asyn mode v out =0.9v, no load i inductor 50ma/div output ripple voltage for asyn mode i out =50ma, v out =0.9v ctrl 5v/div short recovery for asyn mode v out =0.9v, i out =50ma
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 7 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical performanc e characteristics (continued) v in = 6v, v out = 1.8v, l=2.2uh, t a = +25oc, pwm mode, unless otherwise noted. 40us/div v out 500mv/div v sw 5v/div ctrl 5v/div i inductor 1a/div v out 500mv/div 20us/div ctrl 5v/div i inductor 1a/div v sw 5v/div 4us/div v out 500mv/div ctrl 5v/div v sw 5v/div i inductor 1a/div
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 8 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. operation main switch (pch) synchronous rectifier (nch) + - comp dl dh 0.04 reverse- current stop comparator pwm control logic iamp 10x + - current sense amp eamp + - feedback error amp pwm slope comp + + - pwmcmp ics 1.5mhz oscillator osc fb bias & voltage reference 0.6v en fb sw eao cc 17pf rz 1.2meg ctrl drn pgood + - pg_comp 0.66v 0.66v schottky diode dc vth noff async. control (fixed-on pfm) 0.60v 0.54v - + 0.54v in gnd figure 1-functional block diagram the MP2113 is a fixed frequency 1.5mhz current mode 1.5a step-down converter with dynamic voltage control. it has user selectable two operation modes: forced pwm mode for high load and asynchronous mode for light load. the output voltage for each mode can be set independently, through an external resistor divider and a control pin. MP2113 is optimized for low voltage, li-ion battery powered applications where high efficiency and small size are critical. forced pwm mode the forced pwm mode uses a high side pfet main switch and a low side synchronous rectifier, and always operates in continuous conduction mode. thus it simplifies the control scheme and eliminates the random spectrum noise due to discontinuous conduction mode. the steady state duty cycle d for this mode can be calculated as: % 100 v v % 100 f t d in out osc on = where t on is the main switch on time and f osc is the oscillator frequency (1.5mhz typ.). current mode pwm control slope compensated current mode pwm control provides stable switching and cycle-by-cycle current limiting for superior load and line response as well as protection of the internal main switch and synchronous rectifier. the MP2113 switches at a constant frequency (1.5mhz) and modulates the inductor peak current to regulate the output voltage. specifically, for each cycle the pwm controller forces the inductor peak current to an internal reference level derived from the feedback error voltage. at normal operation, the main switch is turned on at each rise edge of the internal oscillator, and remains on for a certain period of time to ramp up the inductor current. as soon as the inductor current reaches the reference level, the main switch is turned off and immediately the synchronous rectifier will be turned on to provide the inductor current. in forced pwm mode, the synchronous rectifier will stay on until the next oscillator cycle.
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 9 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. dropout operation the MP2113 allows the main switch to remain on for more than one switching cycle to increase the duty cycle when the input voltage is dropping close to the output voltage. when the duty cycle reaches 100%, the main switch is held on continuously to deliver current to the output up to the pfet current limit. in this case, the output voltage becomes the input voltage minus the voltage drop across the main switch and the inductor. short circuit protection when the output is shorted to ground, the oscillator frequency is reduced to prevent the inductor current from increasing beyond the pfet current limit. the pfet current limit is also reduced to lower the short circuit current. the frequency and current limit will return to the normal values once the short circuit condition is removed and the feedback voltage approaches 0.6v. maximum load current the mp2116 can operate down to 2.7v input voltage; however the maximum load current decreases at lower input due to a large ir drop on the main switch and synchronous rectifier. the slope compensation signal reduces the peak inductor current as a function of the duty cycle to prevent sub-harmonic oscillations at duty cycles greater than 50%. conversely, the current limit increases as the duty cycle decreases. asynchronous mode operation to improve efficiency at light load condition, user can set MP2113 to operate in asynchronous mode.the maximum load current for this mode is designed to be around 50ma. mode switching user can switch between the two operation modes for MP2113 by toggling the ctrl input pin on the fly. bring ct rl high will put MP2113 in forced pwm mode and low will put MP2113 in asynchronous mode. ctrl pin can also be used to change the feedback resistor divider ratio, through an open-drain output drn pin. bring ctrl high will connect drn to ground through a low resistance (<100 ? ) switch; bring ctrl low will put drn pin to open circuit. user can simply connect a third resistor between feedback pin and drn pin, to get a higher output level for forced pwm mode and a lower level for asynchronous mode. MP2113 is designed to optimally ramp up and down the output voltage when ctrl changes state. typically it takes about 10s to ramp up the voltage and 30s to ramp down the voltage. pgood indicator MP2113 provides an open-drain pgood output that goes high after output level reaches regulation during startup. during mode switching where the output voltage level could be changed, there is a 200us de-glitch time on pgood to allow the output to settle to the desired level, and to avoid false trigger. pgood goes low if the output goes out of regulation by 10% and the de-glitch times out, or when device enters shutdown.
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 10 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. application information output voltage setting the external resistor divider sets the output voltage. the resistor r1 also sets the feedback loop bandwidth for the step-down converter. (see figure 1). choose r1 to be between 200k-300k ? for optimal transient response. r2 is calculated using the desired output voltage for asynchronous mode: 1 6 . 0 1 2 _ ? = v v r r async out r3 is then calculated using r1, r2 and the desired output voltage for forced pwm mode: 1 2 1 2 6 . 0 2 1 3 _ ? + ? = r r r v v r r r fpwm out if one want to have the same output voltage level for both operation mode, r3 will not be needed. table 1?resistor selection vs. output voltage setting v o _ async /v o _ fpwm r1 r2 r3 0.9v/1.8v 301k ? (1%) 604k ? (1%) 200k ? (1%) 1.2v/1.8v 301k ? (1%) 301k ? (1%) 301k ? (1%) 1.2v/2.5v 301k ? (1%) 301k ? (1%) 137k ? (1%) 1.5v/3.3v 301k ? (1%) 200k ? (1%) 100k ? (1%) inductor selection a 1h to 10h inductor with dc current rating at least 25% higher than the maximum load current is recommended for most applications. for best efficiency, the inductor dc resistance shall be <200m ? . for most designs, the inductance value can be derived from the following equation: () osc l in out in out f i v v v v l ? ? = where ? i l is inductor ripple current. choose inductor ripple current approximately 30% of the maximum load current, 1.5a. the maximum inductor peak current is: 2 i i i l load ) max ( l ? + = table 2?suggested inductors manufacturer part number inductance (h) dimensions lxwxh (mm 3 ) wruth 7447745022 2.2 5.8x5.2x2 toko 636cy- 2r2m 2.2 6.8x6x3.5 tdk vlcf5020t- 2r2n2r6-1 2.2 5x5x2 input capacitor c in selection the input capacitor reduces the surge current drawn from the input and switching noise from the device. ceramic capacitors with x5r or x7r dielectrics are highly recommended because of their low esr and small temperature coefficients. for most applications, a 4.7f capacitor is sufficient. output capacitor c out selection the output capacitor keeps output voltage ripple small and ensures regulation loop stable. the output capacitor impedance shall be low at the switching frequency. ceramic capacitors with x5r or x7r dielectrics are recommended. for forced pwm mode operation, the output ripple ? v out is approximately: ) 1 8 1 ( ) ( out osc esr osc in out in out out c f r l f v v v v v ? ? + ? ? ? ? = ? for asynchronous mode operation, the output ripple is the scaled amplitude of the feedback threshold hysteresis window: () 2 2 1 594 . 0 606 . 0 r r r v v v out + ? ? = ? thermal dissipation power dissipation shall be considered when MP2113 operates at maximum 1.5a output current. if the junction temperature rises above 150 c, MP2113 will be shut down by internal thermal protection circuitry. the junction-to-ambient thermal resistance of the 8-pin qfn (2mm x 3mm) r ja is 50 c/w. the maximum allowable power dissipation is
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 11 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. about 1.6w when MP2113 is operating in a 70 c ambient temperature environment: w 6 . 1 w / c 50 c 70 c 150 pd o o o max = ? = pcb layout the high current paths (gnd, in and sw) should be placed very close to the device with short, direct and wide traces. input capacitors should be placed as close as possible to the respective in and gnd pins. the external feedback resistors shall be placed next to the fb pins. keep the switching nodes sw short and away from the feedback network. c2 c1 l1 r4 r1 gnd r2 fb gnd in sw ctrl r3 gnd vin vout dnr 5 6 7 2 3 4 8 1 pg en gnd top layer bottom layer figure 2-pcb layout
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control MP2113 rev. 1.0 www.monolithicpower.com 12 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. typical application circuits MP2113 fb drn en gnd in 2.7-6v 1.8v/1.5a v in v out sw pgood ctrl c in 4.7uf c out 22uf r3 200k r2 604k r1 301k l1 2.2uh r4 500k figure 3-typical application circuit
MP2113 ? 1.5a, synchronous step-down conv erter with dynamic voltage control notice: the information in this document is subject to change wi thout notice. users should warra nt and guarantee that third party intellectual property rights are not infringed upon w hen integrating mps products into any application. mps will not assume any legal responsibility for any said applications. MP2113 rev. 1.0 www.monolithicpower.com 13 4/4/2011 mps proprietary information. unaut horized photocopy and duplication prohibited. ? 2011 mps. all rights reserved. package information qfn8 (2mm x 3mm) side view top view bottom view 2.90 3.10 1.90 2.10 0.00 0.05 pin 1 id marking 1.70 0.50 0.25 recommended land pattern 2.90 note: 1) all dimensions are in millimeters. 2) exposed paddle size do es not include mold flash. 3) lead coplanarity shall be 0.10 millimeter max. 4) drawing conforms to jedec mo-229, variation vced-2. 5) drawing is not to scale. 1.60 0.70 pin 1 id option b r0.20 typ. detail a pin 1 id index area 1 8 5 4 1.65 1.85 1.50 1.70 0.50 bsc 0.18 0.30 pin 1 id see detail a 0.30 0.50 0.80 1.00 0.20 ref pin 1 id option a 0.30x45 o typ.

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