AP3423 Datasheet, PDF (1/10 Pages) BCD Semiconductor Manufacturing Limited – 1.2A, 1.4MHz, Dual Synchronous DC-DC Buck Converter

Data Sheet
1.2A, 1.4MHz, Dual Synchronous DC-DC Buck Converter AP3423
General Description
The AP3423 is a dual high-efficiency, 1.4MHz fixed
frequency, current mode, PWM synchronous buck
(step-down) DC-DC converter, capable of driving a
1.2A load with high efficiency, excellent line and
load regulation.
The AP3423 integrates synchronous P-channel and
N-channel power MOSFET switches with low
on-resistance. It is ideal for portable applications
powered from a single Li-ion battery. 100% duty
cycle and low on-resistance P-channel internal power
MOSFET can maximize the battery life.
The switching frequency of AP3423 is 1.4MHz,
which allows small-sized components, such as
capacitors and inductors_. A standard series of
inductors from several different manufacturers are
available. This feature greatly simplifies the design of
switch-mode power supplies.
The AP3423 is available in DFN-3×3-12 package.
Features
• Dual Channel DC-DC Converter
• Independent Enable Control
• Input Voltage Range: 2.5 to 5.5V
• Adjustable Output from 0.6 to V_IN
• 0.6V Reference Voltage with ± 2% Precision
• Output Current: 1.2A
• High Efficiency: up to 95%
• Low R_DSON Internal Switches
• Operation Frequency: 1.4MHz
• Current Mode Control
• 100% Duty Cycle
• Built-in Soft-start
• Built-in UVLO Function
• Built-in Short Circuit Protection
• Built-in Current Limit Function
• Built-in Thermal Shutdown Protection
• DFN-3×3-12 package
Applications
• Portable Media Player
• Digital Still and Video Cameras
• Notebook
Oct. 2011 Rev. 1. 1
DFN-3×3-12
Figure 1. Package Type of AP3423
BCD Semiconductor Manufacturing Limited
1