ics for telephone 1 publication date: june 2006 sde00001ceb an1201sm polarity inverting charge pump dc/dc converter ic overview an1201sm is a negative voltage generation ic for bias voltage of transmission power module of cellular phones. this ic is a polarity inverting dc/dc converter to change from positive voltage into negative voltage. features ? high power conversion efficiency: 89% typ. (when output current is 5 ma.) ? low output resistance: 20 ? typ. ? high voltage conversion efficiency: 99.9% ? small (s-mini) package applications ? cellular phones package ? smini-5da block diagram c2 5 v in 1 v out 2 gnd 4 c1 3 s3 s1 s2 s4 osc
an1201sm 2 sde00001ceb note) 1. do not apply external currents or voltages to any pins not specifically mentioned. for circuit currents, ( + ) denotes current flowing into the ic, and ( ? ) denotes current flowing out of the ic. 2. *1: except for the power dissipation, operating ambient temperature and storage temperature, all ratings are for t a = 25c. *2: t a = 85c, for the independent ic without a heat sink. absolute maximum ratings parameter symbol rating unit supply voltage v in 3.3 v supply current i in 10 ma output current i o 20 ma power dissipation * 2 p d 48 mw operating ambient temperature * 2 t opr ? 30 to + 85 c storage temperature * 1 t stg ? 55 to + 125 c recommended operating range parameter symbol range unit supply voltage v in 2.0 to 3.0 v electrical characteristics at v in = 2.5 v, c1 = 1 f, t a = 25 c parameter symbol conditions min typ max unit oscillator frequency f osc v in = 2.5 v, no load 66 125 198 khz t a = ? 30 c to 85 c ? design reference data note) the characteristics listed below are theoretical values based on the ic design and are not guaranteed. unless otherwise specified: v in = 2.5 v, t a = 25 c parameter symbol conditions min typ max unit consumption current i cc no load ? 0.25 1 ma oscillator frequency f osc no load 90 125 160 khz output resistance r out load 500 ??? 50 ? voltage conversion efficiency v no load 95.0 99.9 ? % power efficiency p load 500 ? 80 89 ? % consumption current in sleep mode i off v in = 0.2 v, no load ?? 1 a pin descriptions pin no. symbol description 1v in supply voltage pin 2v out inverted output pin 3 c1 charge pump capacitor's positive polarity side connecting pin 4 gnd ground pin 5 c2 charge pump capacitor's negative polarity side connecting pin
an1201sm 3 sde00001ceb technical data ? p d ? t a curves of smini-5da p d ? t a application circuit example power dissipation p d (w) 0.000 independent ic without a heat sink r th( j-a) = 833.3?c/w 05085 75 100 25 125 ambient temperature t a ( c) 0.050 0.048 0.100 0.120 0.150 0.200 c2 5 v in v cc i cc 1 v out 2 gnd 4 c1 3 s3 s1 s2 s4 osc load 500 ? 100 h 1 f 2.2 f 1 f 1 f
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