APW1172 데이터 시트보기 (PDF) - Anpec Electronics

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APW1172

2.5A SWITCH STEP DOWN SWITCHING REGULATOR

Anpec Electronics 

APW1172

2.5A SWITCH STEP DOWN SWITCHING REGULATOR

Features

General Description

• 2.5A Internal Switch

• Operating Input Voltage from 4.8V to 22V

• 3.3V ±2% Reference Voltage

• Output Voltage :

APW1172 - adjustable from 1.235V to 20V

• Low Dropout Operation: 100% Duty Cycle

• 250KHz Internally Fixed Frequency

• Voltage Feed-Forward

• Zero Load Current Operation

• Internal Current Limit

• Inhibit for Zero Current Consumption

• Synchronization

• Protection Against Feedback Disconnection

• Thermal Protection

• External Soft-Start

• Over-Voltage Protection

• Lead Free Available (RoHS Compliant)

Applications

• Consumer: STB, DVD, TV, VCR, Car Radio,

LCD monitors

• Networking: XDSL, Modems, DC-DC Modules

• Computer: Printers, Audio/Graphic Cards,

Optical Storage, Hard Disk Drive

• Industrial: Chargers, Car Battery DC-DC

Converters

The APW1172 is a step down monolithic power

switching regulator with a switching current limit of

3.8A so it is able to deliver more than 2.5A DC current

to the load depending on the application conditions.

The output voltage can be set from 1.235V to 22V.The

high current level is also achieved utilize an SO8

package with exposed pad frame. The type of package

allows to re-duce the Rth (j-amb) down to approximately

45°C/W.

An internal oscillator fixes the switching frequency at

250KHz.

Having a minimum input voltage of 4.8V only, it is

particularly suitable for 5V bus, available in all computer

related applications.

Pulse by pulse current limit with the internal frequency

modulation offers an effective constant current short

circuit protection.

Pin Description

OUT 1

SYNC 2

INH 3

COMP 4

8 VCC

7 GND

6 VREF

5 FB

SOP-8-P (Top View)

= Thermal Pad

(connected to GND plane for better heat

dissipation)

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.4 - Aug., 2005

www.anpec.com.tw

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