Diodes AP3435 - Manual

Preliminary Datasheet
1.0MHz, 3.5A, Synchronous Step Down DC-DC Converter AP3435
Dec. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AP3435 is a high efficiency step-down DC-DC
voltage converter. The chip operation is optimized
by peak-current mode architecture with built-in
synchronous power MOS switchers. The oscillator
and timing capacitors are all built-in providing an
internal switching frequency of 1MHz that allows
the use of small surface mount inductors and
capacitors for portable product implementations.
Integrated Soft Start (SS), Under Voltage Lock Out
(UVLO), Thermal Shutdown Detection (TSD) and
Short Circuit Protection are designed to provide
reliable product applications.
The device is available in adjustable output voltage
versions ranging from 0.8V to 0.9×V
IN
(2.7V≤V
IN
≤5.5V), and is able to deliver up to 3.5A.
The AP3435 is available in PSOP-8 package.
Features
• High Efficiency Buck Power Converter
• Output Current: 3.5A
• Low R
DS(ON)
Internal Switches:100mΩ (V
IN
=5V)
• Adjustable Output Voltage from 0.8V to 0.9×V
IN
• Wide Operating Voltage Range: 2.7V to 5.5V
• Built-in Power Switches for Synchronous
Rectification with High Efficiency
• Feedback Voltage: 800mV
• 1.0MHz Constant Frequency Operation
• Thermal Shutdown Protection
• Low Drop-out Operation at 100% Duty Cycle
• No Schottky Diode Required
• Input Over Voltage Protection
Applications
• LCD TV
• Set Top Box
• Post DC-DC Voltage Regulation
• PDA and Notebook Computer
Figure 1. Package Type of AP3435
PSOP-8