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APW7093

3A, 1MHz, Step Down DC/DC Regulator

Anpec Electronics 

APW7093

3A, 1MHz, Step Down DC/DC Regulator

Features

General Description

• 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

The APW7093 is a reversible energy flow, constant-

off-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 90mΩ PMOS power

switch and 60mΩ NMOS 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%.

The APW7093 uses a unique current-mode,

constant-off-time, PWM control scheme that allows

the output to source or sink current. This feature

allows energy to return to the input power supply that

otherwise would be wasted. The programmable

constant-off-time architecture sets switching frequencies

up to 1MHz, allowing the user to optimize performance

trade-offs between efficiency, output switching noise,

component size, and cost. The APW7093 features an

adjustable soft-start to limit surge currents during

startup, a 100% duty-cycle mode for low-dropout

operation, and a low-power shutdown mode that disables

the power switches and reduces supply current below

1µA. The APW7093 is available in a 32-pin QFN with

an exposed backside pad or a 16-pin SSOP.

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

Copyright © ANPEC Electronics Corp.

1

Rev. A.5 - Jun., 2005

www.anpec.com.tw

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