Product Brief
1.1MHz, 650mA SYNCHRONOUS DC-DC BUCK CONVERTER
Description
The AP3406 is a 1.1MHz fixed frequency, current
mode, PWM synchronous buck (step-down)
DC-DC converter, capable of driving a 650mA
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 AP3406. This feature greatly simplifies
the design of switch-mode power supplies.
This IC is available in TSOT-23-5 and SOT-23-5
packages.
AP3406
Parametric Table
Input Voltage Range (V)
Maximum Output Current
(Min) (mA)
Feedback Voltage (V)
Oscillator Frequency (MHz)
Efficiency
@200mA
(%)
V
IN
=4.2V, V
OUT
=3.3V
V
IN
=3.6V, V
OUT
=1.8V
2.5 to 5.5
650
0.6
1.1
95
92
Features
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High Efficiency: up to 95%
Output Current: 650mA
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
Benefits
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High Efficiency
High Output Current
Easy to Use
Additional Available Materials
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Samples
Preliminary Datasheet
Demo Board
Demo Board Manual
Application Note
ESD Report
Applications
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GPS
WiFi Card
Portable Media Player
Digital Still and Video Cameras
Jun. 2008
1
BCD Semiconductor Manufacturing Limited