AP5101

1.5A Step-Down Converter with 1.4MHz Switching

Frequency

AP5101

Document number: DS32258 Rev. 1 - 2

1 of 15

www.diodes.com

July 2010

© Diodes Incorporated

Description

The AP5101 is a current mode step-down converter with a

built-in power MOSFET to enable smallest solution size

power conversion.

With the low series resistance power switch it enables a

constant output current of up to 1.5A over a wide input supply

range. The load and line regulation has excellent response

time over the operating input voltage and temperature range.

The AP5101 is self protected, through a cycle-by-cycle

current limiting algorithm and an on chip thermal protection.

The AP5101 will provide the voltage conversion with a low

count of widely available standard external components.

The AP5101 is available in SO-8 package.

Pin Assignments

SO-8

( Top View )

1

2

3

4

8

7

6

5

GND

BST

FB

COMP

SW

GND

EN

IN

Features

•

•

1.5A Peak Output Current

•

Stable with Low ESR Ceramic Output Capacitors

•

External compensation

•

Up to 92% Efficiency

•

0.1µA Shutdown Mode

•

Fixed 1.4MHz Frequency

•

Thermal Shutdown

•

Cycle-by-Cycle Over Current Protection

•

Output Adjustable from 0.81V to 15V

•

SO-8: Available in “Green” Molding Compound

(No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

Applications

•

Distributed Power Systems

•

Battery Charger

•

Pre-Regulator for Linear Regulators

•

WLED Driver

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

1

7

2

6

4,8

5

3

IN

EN

GND

COMP

FB

SW

BST

AP5101

Output

3.3V 1.5A

C2

C3

R3

R2

C4

L1

Input

4.75V to 22V

R1

C1

ON

OFF

D1

Figure 1 Typical Application Circuit