AP3422

Preliminary Datasheet Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter AP3422 General Description The AP3422 contains two independent 1.1MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converters, each of them is capable of driving a 800mA load with high efficiency, excellent line and load regulation. Each converter integrates a main switch and a synchronous switch without an external Schottky diode. It is ideal for powering portable equipment that runs from a single Li-ion battery. A standard series of inductors are available from several different manufacturers optimized for use with the AP3422. This feature greatly simplifies the design of switch-mode power supplies. This IC is available in DFN-3×3-10 package. Features High Efficiency: up to 95% Output Current on Each Channel: 800mA Input Voltage Range: 2.5V to 5.5V Fixed 1.1MHz Frequency 100% Duty Cycle in Dropout Built-in Short Circuit Protection Built-in Thermal Shutdown Function Built-in Current Limit Function Shutdown Current: <1µA Applications GPS WiFi Card Portable Media Player Digital Still and Video Cameras Feb. 2013 Rev. 1. 2 DFN-3×3-10 Figure 1. Package Type of AP3422 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter Pin Configuration DN Package (DFN-3×3-10) Pin 1 Mark AP3422 1 10 29 38 47 56 Pin Description Figure 2. Pin Configuration of AP3422 (Top View) Pin Number Pin Name F...