AP5100

1.2A Step-Down Converter with 1.4MHz Switching

Frequency

AP5100

Document number: DS32130 Rev. 2 - 2

1 of 10

www.diodes.com

November 2010

© Diodes Incorporated

Description

The AP5100 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 1.2A over a wide input supply

range. The load and line regulation has excellent response

time over the operating input voltage and temperature range.

The AP5100 is self protected, through a cycle-by-cycle

current limiting algorithm and an on chip thermal protection.

The AP5100 will provide the voltage conversion with a low

count of widely available standard external components.

The AP5100 is available in SOT26 package.

Pin Assignments

1

2

3

74

6

EN

GND

IN

FB

SOT26

5

BST

( Top View )

SW

Features

•

•

Load current of up to 1.2A

•

Internal Power MOSFET

•

Stable with Low ESR Ceramic Output Capacitors

•

Up to 90% Efficiency

•

0.1µA Shutdown Mode

•

Fixed 1.4MHz Frequency

•

Thermal Shutdown

•

Cycle-by-Cycle Over Current Protection

•

Resistor divider adjustable Output: 0.81V to 15V

•

SOT26: 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 Drivers

Notes:

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

Figure 1. Efficiency vs. Load Current

BST

SW

FB

IN

EN

C2

AP5100

R1

R2

D1

GND

C3

.L1

C1

ON

OFF

C6

5

4

1

6

3

Figure 2. Typical Application Circuit