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mp2303a 3a, 28v, 360khz synchronous rectified step-down converter mp2303a rev.1.1 www.monolithicpower.com 1 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. the future of analog ic technology description the mp2303a is a monolithic synchronous buck regulator. the device integrates a 150m ? high-side mosfet and a 80m ? low-side mosfet that provide 3a continuous load current over a wide operating input voltage of 4.7v to 28v. current mode control provides fast transient response and cycle-by-cycle current limit. an adjustable soft-start prevents inrush current at turn-on. in shutdown mode, the supply current drops to lower than 1 a. this device, available in an 8-pin soic and pdip-8 packages, provides a very compact system solution with minimal reliance on external components. features ? 3a output current ? wide 4.7v to 28v operating input range ? integrated mosfet switches ? output adjustable from 0.80v to 25v ? up to 95% efficiency ? programmable soft-start ? stable with low esr ceramic output capacitors ? fixed 360khz frequency ? cycle-by-cycle over current protection ? input under voltage lockout ? available in thermally enhanced 8-pin soic and pdip-8 packages applications ? distributed power systems ? pre-regulator for linear regulators ? notebook computers a ll mps parts are lead-free and adhere to the rohs directive. for mps green status, please visit mps website under products, quality assurance page. ?mps? and ?the future of analog ic technology? are registered trademarks of monolithic power systems, inc. typical application c5 10nf mp2303a bs in 1 2 3 5 6 4 8 7 fb sw ss gnd comp en 40 50 60 70 80 90 100 output current 0 0.5 1.0 1.5 2.0 2.5 3.5 3.0 v in =5v v in =12v v in =24v v out =3.3 v in =28v
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 2 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. ordering information part number package top marking free air temperature (t a ) mp2303adn * soic8e m2303adn -40 ? c to +85 ? c MP2303ADP ** pdip8 mp2303a -40 ? c to +85 ? c * for tape & reel, add suffix ?z (e.g. mp2303adn?z); for rohs compliant packaging, add suffix ?lf (e.g. mp2303adn?lf?z) * * for tape & reel, add suffix ?z (e.g. MP2303ADP?z); for rohs compliant packaging, add suffix ?lf (e.g. MP2303ADP?lf?z) package reference bs in sw gnd ss en comp fb 1 2 3 4 8 7 6 5 top view 8 7 6 5 ss en comp fb bs in sw gnd 1 2 3 4 top view mp2303a_pd01-pdip8 absolute maxi mum ratings (1) supply voltage v in ........................ -0.3v to +30v switch voltage v sw .................. -1v to v in + 0.3v boost voltage v bs .......... v sw - 0.3v to v sw + 6v all other pins .................................. -0.3v to +6v junction temperature ............................... 150c continuous power dissipation (t a = +25c) (2) soic8e ...................................................... 2.5w pdip8 ........................................................ 1.2w lead temperature .................................... 260c storage temperature .............. -65c to +150c recommended operating conditions (3) input voltage v in .............................. 4.7v to 28v output voltage v out ....................... 0.80v to 25v maximum junction temp. (t j ) ................ +125c thermal resistance (4) ja jc soic8e .................................. 50 ...... 10 ... ? c/w pdip8 .................................... 105 ..... 45 ... ? 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..
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 3 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. electrical characteristics (5) v in = 12v, t a = +25c, unless otherwise noted. parameter symbol condition min typ ( 5 ) max units shutdown supply current v en = 0v 0.3 3.0 a supply current v en = 2.7v, v fb = 1.0v 1.45 1.6 ma feedback voltage v fb 4.7v ? ? t a +85 c 0.765 0.835 v ovp threshold voltage 0.90 0.95 1.00 v error amplifier voltage gain a ea 400 v/v error amplifier transconductance g ea ? ? a 550 820 1100 a/v high-side switch-on resistance r ds ( on ) 1 150 m ? low-side switch-on resistance r ds ( on ) 2 80 m ? high-side switch leakage current v en = 0v, v sw = 0v 0 10 a upper switch current limit 4.3 6.0 a lower switch current limit from drain to source 1.25 a comp to current sense transconductance g cs 7 a/v oscillation frequency f osc1 t a = +25 c 310 360 410 khz -40 c t a +85 c 290 430 khz short circuit oscillation frequency f osc2 v fb = 0v 55 khz maximum duty cycle d max v fb = 0.7v 85 90 % minimum on time 180 ns en shutdown threshold voltage v en rising 1.0 1.3 1.6 v en threshold voltage hysteresis 205 mv en input current v en = 5v 2 a input under voltage lockout threshold uvlo v in rising, t a = +25 c 3.6 3.95 4.3 v 0 c t a +70 c 3.2 4.5 v input under voltage lockout threshold hysterisis 125 mv soft-start current v ss = 0v 6 a thermal shutdown 160 c notes: 5) 100% production test at +25c. spec ifications over the temperature range ar e guaranteed by design and characterization.
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 4 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pin functions pin # name description 1 bs high-side gate drive boost input. bs supplies the drive for the high-side n-channel mosfet switch. connect a 0.01 f or greater capacitor from sw to bs to power the high side switch. 2 in power input. in supplies the power to the ic, as well as the step-down converter switches. drive in with a 4.7v to 28v power source. bypass in to gnd with a suitab ly large capacitor to eliminate noise on the input to the ic. see input capacitor . 3 sw power switching output. sw is the switching node that supplies power to the output. connect the output lc filter from sw to the output load. note that a c apacitor is required from sw to bs to power the high-side switch. 4 gnd ground (connect exposed pad to pin 4) 5 fb feedback input. fb senses the output voltage to regulate that voltage. drive fb with a resistive voltage divider from the output vo ltage. the feedback threshold is 0.80v. see setting the output voltage . 6 comp compensation node. comp is used to compensate the regulation control loop. connect a series rc network from comp to gnd to co mpensate the regulation control loop. in some cases, an additional capacitor from comp to gnd is required. see compensation components. 7 en enable input. en is a digital input that turns the regulator on or off. drive en high to turn on the regulator, drive it low to turn it off. connec t en with in through a resistive voltage divider for automatic startup. do not float this pin. 8 ss soft-start control input. ss controls the soft-star t period. connect a capacitor from ss to gnd to set the soft-start period. a 0.1 f capacitor sets the soft-start period to 15ms. to disable the soft-start feature, leave ss unconnected.
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 5 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics v in = 12v, v out = 3.3v, t a = +27oc, unless otherwise noted. 0 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 5 1015202530 0 0.5 -3.0 -2.5 -2.0 -1.5 -1.0 -0.5 0 0.5 1.0 1 1.5 2.0 2.5 3.0 3.5 0 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 5 1015202530 01 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 23456 0 0 20 40 60 80 100 120 10 20 30 40 50 0 0 1 2 3 4 5 6 0.2 0.4 0.6 0.8 1.0 v fb =1v v en =0v i out =1.5a i out =3a v in =5v v in =12v v in =24v v in =28v v in =5v v in =28v v in =12v v in =24v v fb =0.6v
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 6 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics (continued) v in = 12v, v out = 3.3v, t a = +27oc, unless otherwise noted. v out 200mv/div v sw 10v/div v out 2v/div v sw 10v/div v en 2v/div i inductor 2a/div v out 2v/div v sw 5v/div v in 5v/div i inductor 2a/div v out 2v/div v sw 5v/div v in 5v/div i inductor 2a/div i inductor 2a/div v out 2v/div v en 2v/div v sw 10v/div i inductor 2a/div v out 2v/div v en 2v/div v sw 20v/div i inductor 2a/div v out 2v/div v en 2v/div v sw 20v/div i inductor 2a/div 4ms/div 4ms/div
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 7 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. typical performanc e characteristics (continued) v in = 12v, v out = 3.3v, t a = +27oc, unless otherwise noted.
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 8 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. block diagram internal regulators in en + error amplifier 1.2v ovp ramp clk 0.8v 0.3v current comparator current sense amplifier 0.95v shutdown comparator comp ss fb gnd oscillator 360khz s r q sw bs in 5v ovp in < 3.95v + q + + 1.3 v + + + -- -- -- -- -- -- figure 1?functional block diagram operation functional description the mp2303a is a synchronous rectified, current-mode, step-down regulator. it regulates input voltages from 4.7v to 28v down to an output voltage as low as 0.80v, and supplies up to 3a of load current. the mp2303a uses current-mode control to regulate the output voltage. the output voltage is measured at fb through a resistive voltage divider and amplified through the internal transconductance error amplifier. the voltage at comp pin is compared to the switch current measured internally to control the output voltage. the converter uses internal n-channel mosfet switches to step-down the input voltage to the regulated output voltage. since the high side mosfet requires a gate voltage greater than the input voltage, a boost capacitor connected between sw and bs is needed to drive the high side gate. the boost capacitor is charged from the internal 5v rail when sw is low. when the mp2303a fb pin exceeds 20% of the nominal regulation voltage of 0.80v, the over voltage comparator is tripped and latched; the comp pin and the ss pin are discharged to gnd, forcing the high-side switch off.
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 9 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. applications information component selection setting the output voltage the output voltage is set using a resistive voltage divider from the output voltage to fb pin. the voltage divider divides the output voltage down to the feedback voltage by the ratio: 2 r 1 r 2 r v v out fb ? ? thus the output voltage is: out r1 r2 v0.80 r2 ? ?? where v fb is the feedback voltage and v out is the output voltage. a typical value for r2 can be as high as 100k ? , but a typical value is 10k ? . using that value, r1 is determined by: ) k )( 80 . 0 v ( 5 . 12 1 r out ? ? ? ? for example, for a 3.3v output voltage, r2 is 10k ? , and r1 is 31.25k ? . configuring the en control en high to turn on the regulator and en low to turn it off. do not float the pin. for automatic start-up the en pin can be pulled up to input voltage through a resistive voltage divider. choose the values of the pull-up resistor (r up from v in to en pin) and pull-down resistor (r down from en pin to gnd) to determine the automatic start-up voltage: up down in start down (r r ) v1.3 (v) r ? ? ?? for example, for r up =100k ? and r down =20k ? , the v in-start is set at 7.8v. note the en voltage should be no greater than 6v. if the resistive voltage divider will make it run over, please use a zener (below 6v) to clamp it. to avoid noise, a 10nf ceramic capacitor from en to gnd is recommended. inductor the inductor is required to supply constant current to the output load while being driven by the switched input voltage. a larger value inductor will result in less ripple current that will result in lower output ripple voltage. however, the larger value inductor will have a larger physical size, higher series resistance, and/or lower saturation current. a good rule for determining the inductance to use is to allow the peak-to-peak ripple current in the inductor to be approximately 30% of the maximum switch current limit. also, make sure that the peak inductor current is below the maximum switch current limit. the inductance value can be calculated by: ? ? ? ? ? ? ? ? ? ? ? ? in out s out v v 1 i f v l where v in is the input voltage, f s is the switching frequency, and i l is the peak-to- peak inductor ripple current. choose an inductor that will not saturate under the maximum inductor peak current. the peak inductor current can be calculated by: ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out s out load lp v v 1 l f 2 v i i where i load is the load current. optional schottky diode during the transition between high-side switch and low-side switch, the body diode of the low- side power mosfet conducts the inductor current. the forward voltage of this body diode is high. an optional schottky diode may be paralleled between the sw pin and gnd pin to improve overall efficiency. table 2 lists example schottky diodes and their manufacturers. table 2?diode selection guide part number voltage/current rating vendor b340 40v, 3a diodes, inc. sk34 40v, 3a diodes, inc. mbrs340 40v, 3a international rectifier
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 10 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. input capacitor the input current to the step-down converter is discontinuous, therefore a capacitor is required 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 are pref erred, but tantalum or low-esr electrolytic capacitors may also suffice. choose x5r or x7r dielectrics when using ceramic capacitors. since the input capacitor (c1) absorbs the input switching current it requires an adequate ripple current rating. the rms current in the input capacitor can be estimated by: ) v v 1 ( v v i i in out in out load 1 c ? ? ? ? the worst-case condition occurs at v in = 2v out , where: 2 i i load 1 c ? for simplification, choose the 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, a small, high quality ceramic capacitor, i.e. 0.1 f, should be placed as close to the ic as possible. when using ceramic capacitors, make sure that they have enough capacitance to provide sufficient charge to prevent excessive voltage ripple at input. the input voltage ripple caused by capacitance can be estimated by: ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out in out s load in v v 1 v v 1 c f i v output capacitor the output capacitor is required to maintain the dc output voltage. ceramic, tantalum, or low esr electrolytic capacitors are recommended. low esr capacitors are preferred to keep the output voltage ripple low. the output voltage ripple can be estimated by: ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? 2 c f 8 1 r v v 1 l f v v s esr in out s out out where c2 is the output capacitance value and r esr is the equivalent series resistance (esr) value of the output capacitor. in the case of 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: ? ? ? ? ? ? ? ? ? ? ? ? ? ? in out 2 s out out v v 1 2 c l f 8 v v in the case of tantalum or electrolytic capacitors, the esr dominates the impedance at the switching frequency. for simplification, the output ripple can be approximated to: esr in out s out out r v v 1 l f v v ? ? ? ? ? ? ? ? ? ? ? ? ? the characteristics of the output capacitor also affect the stability of the regulation system. the mp2303a can be optimized for a wide range of capacitance and esr values. compensation components mp2303a employs current mode control for easy compensation and fast transient response. the system stability and transient response are controlled through the comp pin. comp pin is the output of the internal transconductance error amplifier. a series capacitor-resistor combination sets a pole-zero combination to control the characteristics of the control system. the dc gain of the voltage feedback loop is given by: out fb vea cs load vdc v v a g r a ? ? ? ? where a vea is the error amplifier voltage gain, g cs is the current sense transconductance, r load is the load resistor value.the system has 2 poles of importance. one is due to the compensation capacitor (c3) and the output resistor of error amplifier, and the other is due to the output capacitor and the load resistor. these poles are located at: vea ea 1 p a 3 c 2 g f ? ? ? ?
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 11 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. load 2 p r 2 c 2 1 f ? ? ? ? where g ea is the error amplifier transconductance, and r load is the load resistor value. the system has one zero of importance, due to the compensation capacitor (c3) and the compensation resistor (r3). this zero is located at: 3 r 3 c 2 1 f 1 z ? ? ? ? the system may have another zero of importance, if the output capacitor has a large capacitance and/or a high esr value. the zero, due to the esr and capacitance of the output capacitor, is located at: esr esr r 2 c 2 1 f ? ? ? ? in this case, a third pole set by the compensation capacitor (c6) and the compensation resistor (r3) is used to compensate the effect of the esr zero on the loop gain. this pole is located at: 3 r 6 c 2 1 f 3 p ? ? ? ? the goal of compensation design is to shape the converter transfer function to get a desired loop gain. the system crossover frequency where the feedback loop has the unity gain is important. lower crossover frequencies result in slower line and load transient responses, while higher crossover frequencies could cause system unstable. a good rule of thumb is to set the crossover frequency to approximately one-tenth of the switching frequency. switching frequency for the mp2303a is 360khz, so the desired crossover frequency is 36khz. table 3 lists the typical values of compensation components for some standard output voltages with various output capacitors and inductors. the values of the compensation components have been optimized for fast transient responses and good stability at given conditions. table 3?compensation values for typical output voltage/capacitor combinations v out l1 c2 r3 c3 c6 1.8v 4.7 h 100 f ceramic 8.2k ? 3.3nf none 2.5v 4.7- 6.8 h 47 f ceramic 5.6k ? 4.7nf none 3.3v 6.8- 10 h 22 fx2 ceramic 7.5k ? 4.7nf none 5v 10- 15 h 22 fx2 ceramic 10k ? 3.3nf none 12v 15- 22 h 22 fx2 ceramic 25k ? 3.3nf none 2.5v 4.7- 6.8 h 560 f al. 30m ? esr 70k ? 3.3nf 150pf 3.3v 6.8- 10 h 560 f al 30m ? esr 90k ? 3.3nf 100pf 5v 10- 15 h 470 f al. 30m ? esr 100k ? 3.3nf 50pf 12v 15- 22 h 220 f al. 30m ? esr 120k ? 3.3nf 50pf to optimize the compensation components for conditions not listed in table 3, the following procedure can be used. 1. choose the compensation resistor (r3) to set the desired crossover frequency. determine the r3 value by the following equation: fb out cs ea c v v g g f 2 c 2 3 r ? ? ? ? ? ? where f c is the desired crossover frequency. 2. choose the compensation capacitor (c3) to achieve the desired phase margin. for applications with typical inductor values, setting the compensation zero, fz1, below one forth of the crossover frequency provides sufficient phase margin. determine the c3 value by the following equation: c f 3 r 2 4 3 c ? ? ? ?
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 12 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. 3. determine if the second compensation capacitor (c6) is required. it is required if the esr zero of the output capacitor is located at less than half of the switching frequency, or the following relationship is valid: 2 f r 2 c 2 1 s esr ? ? ? ? if this is the case, then add the second compensation capacitor (c6) to set the pole f p3 at the location of the esr zero. determine the c6 value by the equation: 3 r r 2 c 6 c esr ? ? external bootstrap diode an external bootstrap diode may enhance the efficiency of the regulator, and it will be a must if the applicable condition is: ? v out is 5v or 3.3v, and duty cycle is high: d= in out v v >65% in these cases, an external bst diode is recommended from the output of the voltage regulator to bst pin, as shown in figure.2 mp2303a sw bst c l bst c 5v or 3.3v out external bst diode in4148 + figure 2?add optional external bootstrap diode to enhance efficiency the recommended external bst diode is in4148, and the bst cap is 0.1~1f. typical application circuits input 4.7v to 28v output 2.5v 3a c3 4.7nf c6 (optional) c5 10nf d1 b340 (optional) mp2303a bs in 1 2 3 5 6 4 8 7 fb sw ss gnd comp en figure 3?mp2303a with avx 47 f, 6.3v ceramic output capacitor
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 13 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. pcb layout guide pcb layout is very important to achieve stable operation. it is highly recommended to duplicate evb layout for optimum performance. if change is necessary, please follow these guidelines and take figure 4 for reference. 1) keep the path of switching current short and minimize the loop area formed by input cap, high-side mosfet and low-side mosfet. 2) bypass ceramic capacitors are suggested to be put close to the v in pin. 3) ensure all feedback connections are short and direct. place the feedback resistors and compensation components as close to the chip as possible. 4) rout sw away from sensitive analog areas such as fb. 5) connect in, sw, and especially gnd respectively to a large copper area to cool the chip to improve thermal performance and long-term reliability. input 4.75v to 23v output c1 c2 c4 c3 d1 (optional) c5 l1 r3 r2 r1 mp2303a bs in fb sw ss gnd comp en 1 2 3 5 6 4 8 7 mp2303a typical application circuit l1 c4 r4 c3 r3 pgnd r1 r1 1 2 3 4 8 7 6 5 fb comp en bs in sw gnd ss c5 d1 c2 pgnd c1 r2 sgnd top layer bottom layer figure 4 D mp2303a typical application circuit and pcb layout guide
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter mp2303a rev.1.1 www.monolithicpower.com 14 7/25/2012 mps proprietary information. patent protec ted. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information soic8e see detail "a" 0.0075(0.19) 0.0098(0.25) 0.050(1.27) bsc 0.013(0.33) 0.020(0.51) seating plane 0.000(0.00) 0.006(0.15) 0.051(1.30) 0.067(1.70) top view front view side view bottom view note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length does not include mold flash, protrusions or gate burrs. 3) package width does not include interlead flash or protrusions. 4) lead coplanarity (bottom of leads after forming) shall be 0.004" inches max. 5) drawing conforms to jedec ms-012, variation ba. 6) drawing is not to scale. 0.089(2.26) 0.101(2.56) 0.124(3.15) 0.136(3.45) recommended land pattern 0.213(5.40) 0.063(1.60) 0.050(1.27) 0.024(0.61) 0.103(2.62) 0.138(3.51) 0.150(3.80) 0.157(4.00) pin 1 id 0.189(4.80) 0.197(5.00) 0.228(5.80) 0.244(6.20) 14 85 0.016(0.41) 0.050(1.27) 0 o -8 o detail "a" 0.010(0.25) 0.020(0.50) x 45 o 0.010(0.25) bsc gauge plane
mp2303a ? 3a, 28v, 360khz synchronous rectified, step-down converter 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. mp2303a rev. 1.1 www.monolithicpower.com 15 7/25/2012 mps proprietary information. patent protected. unauthorized photocopy and duplication prohibited. ? 2012 mps. all rights reserved. package information pdip8 , note: 1) control dimension is in inches. dimension in bracket is in millimeters. 2) package length and width do not include mold flash, or protrusions. 3) drawing conforms to jedec ms-001, variation ba. 4) drawing is not to scale. 0.008(0.20) 0.014(0.36) 0.240(6.10) 0.260(6.60) pin 1 id 0.050(1.27) 0.065(1.65) 0.367(9.32) 0.387(9.83) top view front view side view 1 4 85 0.300(7.62) 0.325(8.26) 0.320( 8.13) 0.400(10.16) 0.125(3.18) 0.145(3.68) 0.120(3.05) 0.140(3.56) 0.015(0.38) 0.021(0.53) 0.100(2.54) bsc 0.015(0.38) 0.035(0.89)

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