AP6508

500kHz 21V 3A SYNCHRONOUS DC/DC BUCK CONVERTER

AP6508

Document number: DS33437 Rev. 4 - 2

1 of 14

www.diodes.com

July 2011

© Diodes Incorporated

Description

The AP6508 is a 500kHz switching frequency internal

compensated synchronous DCDC buck converter. It has

MOSFETs.

The AP6508 enables continues load current of up to 3A with

efficiency as high as 93%.

The AP6508 features current mode control operation, which

enables fast transient response times and easy loop

stabilization.

The AP6508 has external programmable softstart and a

Power Good indicator enabling sequencing and ramp control.

The AP6508 simplifies board layout and reduces space

requirements with its high level of integration and minimal

need for external components, making it ideal for distributed

power architectures.

The AP6508 is available in a standard Green DFN4030-14

package

with

exposed

PAD

for

improved

thermal

performance and is RoHS compliant.

Pin Assignments

SW

BST

SW

PG

SW

AGND

GND

GND

9

6

5

4

3

2

1

12

13

14

11

10

SW

IN

DFN4030-14

Exposed Pad

(Top View)

SS

VCC

EN

7

FB

8

Features

•

•

•

500kHz switching frequency

•

Enable pin

•

External Softstart

•

Power Good

•

Protection

o

OCP

o

Thermal Shutdown

•

Lead Free Finish/ RoHS Compliant (Note 1)

Applications

•

Gaming Consoles

•

TV sets and Monitors

•

Set Top Boxes

•

Distributed power systems

•

Home Audio

•

Consumer electronics

Note:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html.

Typical Application Circuit

Typical Application Circuit

40

50

60

70

80

90

100

0

2

1

3

LOAD CURRENT (A)

Efficiency vs. Load Current

V

= 12V

V

= 5V

IN

IN

V

= 2.5V

OUT