AP3427M

Preliminary Datasheet Dual 1A, 1.5MHZ Synchronous Step-down DC-DC Converter AP3427M General Description The AP3427M is a high efficiency step-down dual channel DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOSFET switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1.5MHz 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 ranging from 0.6V to 0.9×VIN when input voltage range is from 2.5V to 5.5V, and is able to deliver up to 1A. The AP3427M is available in standard DFN-3×3-10 package. Features High Efficiency Buck Power Converter Output Current: 1.0A Low RDS(ON) Internal Switches:200mΩ (VIN=5V) Adjustable Output Voltage from 0.6V to 0.9×VIN Wide Operating Voltage Range: 2.5V to 5.5V Built-in Power Switches for Synchronous Rectification with High Efficiency Feedback Voltage: 600mV 1.5MHz Constant Frequency Operation Thermal Shutdown Protection Low Drop-out Operation at 100% Duty Cycle Input Over Voltage Protection No Schottky Diode Required Applications Post DC-DC Voltage Regulation PDA and Notebook Computer DFN-3×3-10 Figure 1. Packag...