RT7253A

1

DS7253A-02 March 2011

www.richtek.com

Ordering Information

Note :

Richtek products are :

RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.

Pin Configurations

(TOP VIEW)

Applications

Wireless AP/Router

Set-Top-Box

Industrial and Commercial Low Power Systems

LCD Monitors and TVs

Green Electronics/Appliances

Point of Load Regulation of High-Performance DSPs

SOP-8 (Exposed Pad)

3A, 17V, 340kHz Synchronous Step-Down Converter

General Description

The RT7253A is a high efficiency, monolithic synchronous

step-down DC/DC converter that can deliver up to 3A

output current from a 4.5V to 17V input supply. The

RT7253A's current mode architecture and external

compensation allow the transient response to be

optimized over a wide range of loads and output capacitors.

Cycle-by-cycle current limit provides protection against

shorted outputs and soft-start eliminates input current

surge during start-up. The RT7253A also provides under

voltage protection and thermal shutdown protection. The

low current (<3

μA) shutdown mode provides output

disconnection, enabling easy power management in

battery-powered systems. The RT7253A is available in

an SOP-8 (Exposed Pad) package.

Features

±±±±±1.5% High Accuracy Feedback Voltage

4.5V to 17V Input Voltage Range

3A Output Current

Integrated N-MOSFET Switches

Current Mode Control

Fixed Frequency Operation : 340kHz

Output Adjustable from 0.8V to 15V

Up to 95% Efficiency

Programmable Soft-Start

Stable with Low ESR Ceramic Output Capacitors

Cycle-by-Cycle Over Current Protection

Input Under Voltage Lockout

Output Under Voltage Protection

Thermal Shutdown Protection

RoHS Compliant and Halogen Free

BOOT

VIN

SW

GND

SS

EN

FB

COMP

GND

2

3

4

5

6

7

8

9

Marking Information

RT7253AGSP : Product Number

x : H or L

YMDNN : Date Code

RT7253A

xGSPYMDNN

Package Type

SP : SOP-8 (Exposed Pad-Option 1)

RT7253A

Lead Plating System

G : Green (Halogen Free and Pb Free)

H : UVP Hiccup

L : UVP Latch-Off