General Description

The APW7093 is a reversible energy flow, constantoff-time, pulse-width modulated (PWM), step-down DC-DC converter. It is ideal for use in notebook and sub-notebook computers that require 1.1V to 5V active termination power supplies. This device features an internal PMOS power switch and internal synchronous rectifier for high efficiency and reduced component count. The internal 90mW PMOS power switch and 60mWNMOS synchronous-rectifier switch easily deliver continuous load currents up to 3A. The APW7093 accurately tracks an external reference voltage, produces an adjustable output from 1.1V to VIN, and achieves efficiencies as high as 94.

Features

• Source/Sink 3A

• Up to 1MHz Switches Frequency

• Up to 94 Efficiency

• Internal PMOS/NMOS Switches

- 70mΩ/40mΩ On-Resistance at VIN = 4.5V

- 90mΩ/60mΩ On-Resistance at VIN = 3V

• ±1 Output Accuracy

• 1.1V to VIN Adjustable Output Voltage

• 3V to +5.5V Input Voltage Range

• <1μA Shutdown Supply Current

• Programmable Constant-Off-Time Operation

• Thermal Shutdown

• Adjustable Soft-Start Inrush Current Limiting

• Output Short-Circuit Protection

• Lead Free Available (RoHS Compliant)

Applications

• Motherboard

• Graphics Cards

• Cable or DSL Modems, Set Top Boxes

• DSP Supplies

• Memory Supplies

• 5V Input DC-DC Regulators

• Distributed Power Supplies