vishay siliconix sip12501 document number: 73192 s09-1455-rev. b, 03-aug-09 www.vishay.com 1 boost converter for single/double aa cell or nimh battery for white led applications description sip12501 is a boost converter ic for single or double cell nimh or alkaline battery pack, which can drive white leds connected in parallel to provide backlight in hand-held devices. designed with an internal low threshold power mosfet, it is capable of st arting up with a low battery voltage of 0.65 v. for best ef ficiency performance, the sip12501 is designed to operate in pwm mode with 600 khz switching. the voltage-mode pwm design is internally compensated, reducing the external parts count. it accepts input voltages from 0.65 v to 3.3 v, regulates output current of up to 60 ma from a 0.9 v input. the led current can be adjusted externally for its brightness control. sip12501 features low shutdown current of under 1 a, internal power mos, thermal shutdown protec tion and antiringing control. sip12501 is available in a lead (pb)-free 6 pin, powerpak mlp33 package and is specified to operate over the industrial temperature range of - 40 c to 85 c. features ? voltage mode control with internal frequency compensation ? 0.65 v to 3.3 v input voltage range ? low startup voltage: 0.65 v ? pwm control with 600 kh z fixed switching frequency ? analog control of led intensity ? power supply from output voltage ? regulated output current ? integrated uvlo and soft-start ? logic controlled shutdown (< 1 a) ? high efficiency: typical 75 % ? internal power mos ? antiringing switch to minimize emi ? thermal shutdown ? minimum external components ? powerpak ? mlp33-6 package applications ? white led backlighting ? handheld devices ? digital cameras ? portable applications ? lcd bias supplies typical application circuit xshd lx sip12501 v out v in fb gnd 1 5 6 4 2 3 10 h xshd 10 f v in 4.7 f mbr0520 15 15 15 15
www.vishay.com 2 document number: 73192 s09-1455-rev. b, 03-aug-09 vishay siliconix sip12501 notes: a. derate 20 mw/c above 70 c. b. device mounted with all leads soldered or welded to pc board. stresses beyond those listed under ?absolute maximum ratings? ma y cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other condit ions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. notes: a. full = - 40 c to 85 c. b. the algebraic convention whereby the most negative value is a minimum and the most positive a maximum (- 40 c to 85 c). c. typical values are for design aid only, not guaranteed nor subject to production testing. d. minimum operating voltage is determined by the battery ?s capability to provide energy as it is deeply discharged. absolute maximum ratings (all voltages referenced to gnd = 0 v) parameter limit unit input voltage, v in - 0.3 to 6 v lx voltage - 0.3 to v out + 0.5 output voltage, v out - 0.3 to 6 xshd voltage - 0.3 to v in + 0.5 fb voltage - 0.3 to 6 maximum junction temperature 150 c storage temperature - 55 to 150 operating junction temperature 125 power dissipation a powerpak mlp33-6 (t a = 70 c) a 1100 mw thermal resistance b powerpak mlp33-6 50 c/w recommended operating range (all voltages referenced to gnd = 0 v) parameter limit unit input voltage, v in 0.65 to 3.3 v output voltage, v out 3.5 to 5 xshd voltage 0 to v in lx voltage 0 to v out + 0.5 v fb voltage 0 to 5 operating temperature range - 40 to 85 c specifications a parameter symbol test conditions unless specified v in = 1.2 v, v out = 3.9 v, t a = 25 c temp. a limits unit min. b typ. c max. b minimum start-up voltage v start i load = 1 ma full 0.65 0.85 v minimum operating voltage d v hold xshd = v in full 0.55 feedback voltage v fb 0.291 0.3 0.309 full 0.282 0.318 feedback input current i fb v fb = 0.3 v 1na maximum pwm duty cycle maxdty 80 87 % pwm switching frequency f osc full 425 600 775 khz quiescent current i q v fb = 0.4 v full 200 300 a stand-by current i stb xshd = 0 v, not including switch leakage full 1 nmos switch leakage i leak lx = 5 v 12 full 10 nmos switch on resistance r ds(on) v out = 3.3 v 0.24 xshd input high level v xshdh 0.8 v v in 0.9 v full 0.55 v 0.9 v< v in 2 v full 0.8 2 v < v in 5 v full 1.2 xshd input low level v xshdl full 0.2 thermal shutdown t shd 160 c thermal shutdown hysteresis t hyst 20
document number: 73192 s09-1455-rev. b, 03-aug-09 www.vishay.com 3 vishay siliconix sip12501 pin configuration and truth table pin functions xshd (pin 1) xshd is the logic controlled shutdown input pin. when xshd is low, the ic is shutdown and an antiringing switch is connected between lx and v in . when xshd is high, the ic is working in normal operation. v in (pin 2) v in is the pin connected to batt ery input voltage. the ic gets its start-up bias from v in at the beginning. once v out exceeds v in , bias will come from v out . thus, once started, operation is completely independent from v in . operation is only limited by the output vo ltage level and the battery?s internal series resistance. v out (pin 3) v out is the output of the boos t converter and also the power source for the ic. fb (pin 4) fb is the feedback voltage pin, it senses the led current through the ballast resistor, the difference between it and the internal 0.3 v reference is am plified by the error amplifier. gnd (pin 5) gnd is the pin for signal and power ground. lx (pin 6) lx is the pin of the drain for internal power mos. lx is also connected to inductor and schottky diode. if the inductor current falls to zero, or xshd is low, an internal antiringing switch is connected from lx to v in to minimize emi. 2 3 6 5 4 1 powerpak mlp33-6 top view v in xshd gnd lx v out fb ordering information part number temperature range marking SIP12501DMP-T1-E3 - 40 c to 85 c 2501 pin description pin number name function 1 xsdh logic controlled shutdown input, xshd = high: normal operation, xshd = low: shutdown 2 v in battery input voltage 3 v out output of the boost converter and power source for the ic 4 fb feedback pin 5 gnd signal and power ground 6 lx switch pin
www.vishay.com 4 document number: 73192 s09-1455-rev. b, 03-aug-09 vishay siliconix sip12501 functional block diagram detailed operation sip12501 is a 600 khz boost converter ic, packaged in 6 pin mlp33, for white led applicatio ns. with start-up from low battery input voltage of 0.65 v, this device features fixed frequency voltage mode pwm control with internal frequency compensation. with its low r ds(on) internal power mosfet, this device maintains high efficiency over a wide range of load current. low voltage start-up sip12501 is designed to start-up at input voltage of typically 0.65 v. in the beginning, v out is lower than v in because of the voltage drop of the schottky diode, the device uses v in as the power source for the start-up circuit and uses current limit with fixed off-time to c ontrol the increase of the output voltage. once v out exceeds v in , the device uses v out as the power source. when v out exceeds 1.89 v, the device switches to soft-start. soft-start during soft-start, the loop compensation guarantees the slow increase of the output voltage and inrush current, so that no large voltage overshoot and inrush current occur when the soft-start is ended. pwm operation after soft-start, the device works in pwm operation with a fixed frequency of 600 khz. thermal shutdown protection if the temperature of the device is above 160 c, the device will turn off the internal po wer mosfet and wait until the temperature drops below 140 c, then the device goes into the soft-start process again and finally the system recovers. during thermal shutdown, the output voltage drops below 1.89 v minus uvlo hysteresis, start-up will be triggered to keep the output voltage above 1.89 v. antiringing control the antiringing control circuitry prevents high frequency ringing of the lx pin as the inductor current goes to zero by damping the resonant circuit formed by l and c lx (capacitance on lx pin). when the ic is shutdown, this antiringing switch is also turned on. application information white led brig htness control the current of white led can be adjusted by a pwm signal on xshd or by a variable dc voltage to control its brightness. (see figure 1.) as control voltage v ctrl increases, the voltage drop on r2 increases and the voltage drop on r1 decreases. thus, the led current decreases. the selection of r2 and r3 will make the current from v ctrl much smaller than led current and much larger than the fb pin bias current. compensation thermal shutdown reference and soft-start oscillator start-up driver - + antiringing sw pwm + - e/a v out v in gnd lx fb xshd fb xshd lx sip12501 v out v in xshd 1 5 6 4 2 3 10 h xshd 10 f v in 4.7 f mbr0520 r1 15 15 15 15 r3 3.9 k v ctrl r2 1 k i led 0.3 v 15 0.3 v ctrl 15 r2 r3 -
document number: 73192 s09-1455-rev. b, 03-aug-09 www.vishay.com 5 vishay siliconix sip12501 typical characteristics maximum pwm duty cycle vs. temperature feedback voltage vs. temperature 80 81 82 83 84 85 86 87 88 89 90 -50-30-101030507090 temperature (c) e l c y c y t u d % -4 -3 -2 -1 0 1 2 3 4 -50 -30 -10 10 30 50 70 90 ) % ( y c a r u c c a e g a t l o v k c a b d e e f v out = 3.9 v temperature (c) supply current vs. temperature shutdown threshold vs. temperature 0.140 0.142 0.144 0.146 0.148 0.150 0.152 0.154 0.156 0.158 0.160 -50 -30 -10 10 30 50 70 90 ) a m ( t m e r r u c y l p p u s temperature (c) 0.0 0.2 0.4 0.6 0.8 1.0 1.2 -50 -30 -10 10 30 50 70 90 temperature (c) ) v ( d l o h s e r h t n w o d t u h s v in = 5 v v in = 2 v v in = 0.8 v
www.vishay.com 6 document number: 73192 s09-1455-rev. b, 03-aug-09 vishay siliconix sip12501 typical waveforms vishay siliconix maintains worldwide manufacturing capability. products may be manufactured at one of several qualified locatio ns. reliability data for silicon technology and package reliability represent a composite of all qualified locations. for related documents such as package/tape drawings, part marking, and reliability data, see www.vishay.com/ppg?73192 . figure 2. pwm dimming control 200 hz 50 % duty cycle pwm signal on xshd pin figure 4. switching waveforms: v lx , v out and v fb v in = 0.8 v, l = 10 h, c out = 4.7 f, four leds in parallel v xshd 0.5 v/div v out 1 v/div v fb 0.2 v/div 1 ms/div v in = 0.8 v fo u r led s in se ri es 0.5 s/div v lx 2 v/div v out 50 mv/div ac coupled v fb 20 mv/div ac coupled figure 3. startup v in = v xshd = 0 v to 0.8 v 100 ms/div v in 0.5 v/div v out 2 v/div
???? ???? ???? ???? ?? ?? c 0.08 c bbb m a a c ddd m 7 4 9 9 8 6 11 7 8 5 c ccc // nx detail c a1 a c aaa 2 x c aaa 2 x pin 1 mark 1 l2 e b a d l2 nxk e2 e2/2 d2/2 (nd-1) x e d2 n-1 bottom view see detail b n see detail a detail d detail c a1 r r2 l e 12 exposed pad (optional) side view a2 a3 nx b c seating plane detail d topview 4 x 5 10 datum a or b datum a or b nx r1 l2 pin tip 5 pin tip e odd pin/side detail b even pin/side e e/2 l nx r1 detail a edge of plastic body exposed metalized feature this feature applies to both ends of the package exposed slug/heat sink l2 l1 b 0.17 min 0.17 0.30 package information vishay siliconix document number: 72820 28-jan-04 www.vishay.com 1 powerpak mlp33-6, 8 and 10 (power ic only)
notes: 1. dimensioning and tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. all angels are in degrees. 3. n is the total number of pins. 4. the pin #1 identifier and pin numbering convention shall conform to jesd 95-1 spp-012. details of pin #1 identifier is locat ed within the zone indicated. the pin #1 identifier is marked. 5. dimension b applies to metallized pin and is measured between 0.15 mm and 0.20 mm from the pin tip. 6. nd refers to the maximum number of pins on the d side. 7. depopulation of pins is allowed and will be called out on the individual variation. 8. coplanarity applies to the exposed heat sink slug as well as the pins. 9. profile tolerance (aaa) will be applicable only to the plastic body and not to the metallized features (such as the pin tips and tie bars.) metallized features may protrude a maximum of l2 from the plastic body profile. 10. l1 max is not called out, the metallized feature will extend to the exposed pad. thus, the 0.17-mm gap does not apply. 11. the corner will be sharp unless otherwise specified with radius dimensions. package information vishay siliconix www.vishay.com 2 document num ber: 72820 28-jan-04 powerpak mlp33-6, 8, 10 n = 6 pitch: 0.95 mm n = 8 pitch: 0.65 mm n = 10 pitch: 0.50 mm millimeters* inches dim basic min nom max basic min nom max notes a ? 0.80 0.90 1.00 ? 0.031 0.035 0.039 1, 2 a1 ? 0.00 0.025 0.05 ? 0.000 0.001 0.002 1, 2 a2 ? 0.65 0.70 0.75 ? 0.026 0.028 0.030 1, 2 a3 ? 0.15 0.20 0.25 ? 0.006 0.008 0.010 1, 2 aaa ? ? 0.10 ? ? ? 0.004 ? 1, 2 b-6 ? 0.33 0.35 0.43 ? 0.013 0.014 0.017 1, 2, 8 b-8 ? 0.285 0.305 0.385 ? 0.011 0.012 0.015 1, 2, 8 b-10 ? 0.18 0.20 0.28 ? 0.007 0.008 0.011 1, 2, 8 bbb ? ? 0.10 ? ? ? 0.004 ? 1, 2 ccc ? ? 0.10 ? ? ? 0.004 ? 1, 2 d 3.00 ? ? ? 0.118 ? ? ? 1, 2, 8 d2 ? 1.92 2.02 2.12 ? 0.076 0.080 0.083 1, 2, 8 ddd ? ? 0.05 ? ? 0.002 1, 2 e 3.00 ? ? ? 0.118 ? ? ? 1, 2, 8 e2 ? 1.10 1.20 1.30 ? 0.043 0.047 0.051 1, 2, 8 e-6 ? ? 0.95 ? ? ? 0.037 ? 1, 2 e-8 ? ? 0.65 ? ? ? 0.026 ? 1, 2 e-10 ? ? 0.50 ? ? ? 0.020 ? 1, 2 k ? 0.20 ? ? ? 0.008 ? ? 5, 11 l ? 0.20 0.29 0.45 ? 0.008 0.011 0.018 1, 2, 8 l1-6 ? 0.16 0.24 0.40 ? 0.006 0.009 0.016 1, 2, 8 l1-8 ? 0.16 0.24 0.40 ? 0.006 0.009 0.016 1, 2, 8 l1-10 ? ? ? ? ? ? ? ? 1, 2, 8 l2 ? ? ? 0.125 ? ? ? 0.005 5, 11 r ref ? ? 0.15 ? ? ? 0.006 ? 1, 2, 8 r1 ref-6 ? ? 0.127 ? ? ? 0.005 ? 1, 2, 8 r1 ref-8 ? ? 0.15 ? ? ? 0.006 ? 1, 2, 8 r1 ref-10 ? ? 0.075 ? ? ? 0.003 ? 1, 2, 8 ? 0 10 12 ? 0 10 12 1, 2 * use millimeters as the primary measurement. ecn: s-40082?rev. a, 02-feb-04 dwg: 5925
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