_______________________________________________________________________________________________________________ ? 51 xc9301/9302 series pwm, pwm/pfm switching step-up & down dc/dc controller general description features the xc9301/02 series are step-up/down dc/dc converte r controller ics with fast, low on resistance drivers built-in. a versatile, large output current, step-up/down dc/dc con- verter can be realised using only 4 basic external components - transistors, coils, diodes and capacitors. output voltage is selectable in 0. 1v steps within a 2.4v ~ 6.0 v ( 2.5% accuracy) range and switching frequency is set at 180khz. the xc9302 series switches from pwm to pfm control during light loads and the series offers high efficiencies from light loads through to large output currents. soft-start time is internally set to 10 msec which offers pro- tection against rush currents when the power is switched on and also against voltage overshoot. during shutdown (ce pin = l), consumption current can be reduced to as little as 0.5 a or less. input voltage range: 2.0v ~ 10v output voltage range: 2.4v ~ 6.0v ( 2.5% accuracy) (selectable in 0. 1v steps) oscillation frequency: 180khz ( 15% accuracy) output current: more than 250ma (v in =2.4v, v out =3.3v) efficiency: 81% (typ) at 5.0v 78% (typ) at 3.3v stand-by: istb = 0.5 a (max) output voltage internal set-up sot-25 package pin configuration pin assignment 1 2 3 sot-25 (top view) 4 5 pin number pin name function 1 gnd ground 2v dd power supply 3 ext/ external transistor connection 4v out output voltage monitor 5ce chip enable block diagram + - + - ramp wave generator, osc error amp. pwm comparator buffer, driver gnd ext/ pwm/pfm control er phase compensation v dd v out ce vref with soft start, ce ordering information xc9301 ? ? ? ? ? ? function function ? a standard (5-pin) ? ? output voltage : 2.4 ~ 6.0 e.g. 3.0v = ? 3, ? 0 ? package m sot-25 (1reel = 3000pcs) ? oscillator frequency 2 180khz ? embossed tape r standard loading l reverse loading * xc9302 series pwm/pfm switching control (same as xc9301 series)
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