BL9328

BL9328 1.5 MHz, Dual 800mA Synchronous Buck Converter FEATURES  High Efficiency: Up to 96%  1.5MHz Constant Switching Frequency  Current Mode Operation for Excellent Line and Load Transient Response  No Schottky Diode Required  2.5V to 5.5V Input Voltage Range  Adjustable Output Voltage  100% Duty Cycle in Dropout Mode  Output Current:Up to 800mA per Channel  Low Quiescent Current: 180μA each  Over temperature Protection  Short Circuit Protection  Shutdown Quiescent Current < 1μA  Compact and thermally enhanced Package:ESOP-8 APPLICATIONS  Cellular and Smart Phones  Wireless Handsets and DSL Modems  Microprocessors and DSP Core Supplies  PDAs  Digital Still and Video Cameras  MP3/MP4/MP5 Players  Portable Instruments  GPS Receivers DESCRIPTION The BL9328 is a dual constant frequency, 1.5MHz, slope compensated current mode PWM step-down converter working under an input voltage range of 2.5V to 5.5V. This feature makes the BL9328 suitable for single cell Li-ion battery-powered applications. The internal synchronous rectifier is desired to increase efficiency without an external Schottky diode. 100% duty cycle capability extends battery life in portable devices, while the quiescent current is 180μA at no load, and drops to < 1μA in shutdown. Pulse Skipping Mode operation increases efficiency at light loads, further extending battery life. Low output voltage ripple and small external inductor and capacitor sizes are achieved with 1.5MHz switching frequency....