AP3406A Datasheet, PDF (1/12 Pages) BCD Semiconductor Manufacturing Limited – 1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER

Data Sheet
1.1MHz, 800mA SYNCHRONOUS DC-DC BUCK CONVERTER AP3406A
General Description
The AP3406A is a 1.1MHz fixed frequency, current
mode, PWM synchronous buck (step-down) DC-DC
converter, capable of driving a 800mA load with high
efficiency, excellent line and load regulation. The
device 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 AP3406A. This feature greatly simplifies the
design of switch-mode power supplies.
This IC is available in TSOT-23-5 and MSOP-10
packages.
Features
• High Efficiency: up to 95%
• Output Current: 800mA
• Input Voltage Range: 2.5V to 5.5V
• Fixed 1.1MHz Frequency
• Current Mode Control
• 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
TSOT-23-5
MSOP-10
Figure 1. Package Types of AP3406A
May 2009 Rev. 1. 2
BCD Semiconductor Manufacturing Limited
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