_______________________________________________________________________________________________________________ ● XC9301/9302 Series PWM, PWM/PFM Switching Step-Up & Down DC/DC Controller General Description DETAILS Features 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 (VIN=2.4V, VOUT=3.3V) Efficiency: 81% (typ) at 5.0V 78% (typ) at 3.3V Stand-By: ISTB = 0.5µA (max) Output Voltage Internal Set-Up SOT-25 Package The XC9301/02 series are step-up/down DC/DC converter controller ICs with fast, low ON resistance drivers built-in. A versatile, large output current, step-up/down DC/DC converter 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 ~ 6.0V ( ± 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 protection 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 0.5µA or less. Pin Configuration Pin Assignment 5 4 1 3 2 SOT-25 <SOT-23-5> (TOP VIEW) PIN NUMBER PIN NAME 1 2 GND VDD Power Supply 3 EXT/ External Transistor Connection 4 VOUT Output Voltage Monitor 5 CE Chip Enable FUNCTION Ground Block Diagram VOUT Error Amp. + + - - CE Vref with Soft Start, CE VDD Phase Compensation PWM/PFM Controler Buffer, Driver EXT/ , PWM Comparator Ramp Wave Generator, OSC GND , Ordering Information XC9301①②③④⑤⑥ ① ② ③ ④ FUNCTION A：Standard (5-pin) Output Voltage : 2.4 ~ 6.0 e.g. 3.0V = ② → 3, ③ → 0 Oscillator frequency 2：180kHz FUNCTION ⑤ Package M：SOT-25 (1reel = 3000pcs) ⑥ Embossed Tape R：standard loading L：reverse loading * XC9302 Series PWM/PFM switching control (same as XC9301 series) 51