RT8265

1

DS8265-02 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.

Applications

Distributed Power Systems

Battery Charger

Pre-Regulator for Linear Regulators

Pin Configurations

(TOP VIEW)

SOP-8 (Exposed Pad)

3A, 24V, 1MHz Asynchronous Step-Down Converter

SS

BOOT

VIN

GND

SW

FB

EN

COMP

2

3

4

5

8

7

6

GND

9

General Description

The RT8265 is an asynchronous high voltage buck converter

that can support the input voltage range from 4.75V to 24V

and the output current can be up to 3A. The IC provides a

Feed-forward Voltage Mode operation to achieve the goal

of fast line transient response. The RT8265 also provides

adjustable soft-start to be a flexible solution for customers.

The chip provides protection functions such as cycle-by-

cycle current limiting and thermal shutdown protection. In

shutdown mode, the regulator draws 25

μA of supply current.

The RT8265 is available in a SOP-8 (Exposed Pad) surface

mount package.

Features

Wide Operating Input Range : 4.75V to 24V

Adjustable Output Voltage Range : 0.8V to 15V

Output Current up to 3A

25

μμμμμA Low Shutdown Current

Power MOSFET : 110m

Ω

Ω

Ω

Ω

Ω

High Efficiency up to 93%

1MHz Fixed Switching Frequency

Stable with Low ESR Output Ceramic Capacitors

Programmable Soft-Start

Thermal Shutdown

Cycle-By-Cycle Over Current Protection

RoHS Compliant and 100% Lead (Pb)-Free

Typical Application Circuit

Package Type

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

RT8265

Lead Plating System

P : Pb Free

G : Green (Halogen Free and Pb Free)

VIN

EN

GND

BOOT

FB

SW

7

5

2

3

1

L1

4.7µH

CB

10nF

C2

47µF

6.3V

R1

49.9k

R2

16k

3.3V

C1

10µF/25V

Chip Enable

4.75V to 24V

RT8265

D1

B330A

SS

8

0.1µF

COMP

0.56nF

82k

NC

6

4,

9 (Exposed Pad)