Diodes AP3408 - Manual

Preliminary Datasheet
2A, 4MHz High Efficiency Synchronous Buck Converter AP3408
Jan. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
1
General Description
The AP3408 is a current mode, PWM synchronous
buck DC/DC converter, capable of driving a 2A load
with high efficiency, excellent line and load
regulation. It operates in continuous PWM mode.
The AP3408 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 AP3408 can be
programmable from 300kHz to 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 AP3408 is available in DFN-3×3-10 and PSOP-8
packages.
Features
• Input Voltage Range: 2.6 to 5.5V
•
Adjustable Output from 0.8 to 5V
• 0.8V Reference Voltage with ± 2% Precision
• Output Current: 2A
• High Efficiency up to 95%
• Low R
DSON
Internal Switches
• Programmable Frequency: 300kHz to 4MHz
• Current Mode Control
• Forced Continuous-mode Operation
• 100% Duty Cycle
• Synchronizable Switching Frequency
• Power Good Output Voltage Monitoring
• Built-in Soft-start
• Built-in Short Circuit Protection
• Built-in Thermal Shutdown Protection
•
Built-in Current Limit Function
Applications
• Portable Media Player
• Digital Still and Video Cameras
• Notebook
Figure 1. Package Types of AP3408
DFN-3×3-10 PSOP-8