AP3422 Datasheet, PDF (1/11 Pages) BCD Semiconductor Manufacturing Limited – Dual 1.1MHz, 800mA Synchronous DC-DC Buck Converter

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
Sep. 2011 Rev. 1. 1
DFN-3×3-10
Figure 1. Package Type of AP3422
BCD Semiconductor Manufacturing Limited
1