AP5727

BIAS POWER SUPPLY FOR OLED

SUB DISPLAY AND TFT-LED

AP5727

Document number: DS31887 Rev. 2 - 2

1 of 10

www.diodes.com

January 2011

© Diodes Incorporated

Description

The AP5727 is a high efficiency boost converter in a

compact SOT25 that provides the bias voltages for OLED

Sub Display and TFT-LCD (Liquid Crystal Display).

A

high

1.2MHz

switching

frequency

and

internal

compensation minimizes external part count, PCB area and

cost. Integrated soft start reduces inrush current.

The AP5727 has a 1.25V feedback voltage making it

compatible with industry standard boost converters used to

bias LCD panels.

Pin Assignments

1

2

3

74

5

FB

SW

( Top View )

GND

SOT25

EN

Features

•

30V High Output Voltage

•

Fast 1.2MHz Switching Frequency

•

Current limit and UVLO Protections

•

Internal Thermal Shutdown

•

Maximum 1µA Shutdown Current

•

Integrated Soft-start Function

•

SOT25: Available in “Green” Molding Compound

(No Br, Sb)

•

Lead Free Finish/RoHS Compliant (Note 1)

Applications

•

Small size TFT-LCD Bias power supply.

•

OLED bias supply for a clamshell handset sub display

•

RF amplifier bias voltages

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

V

IN

SW

EN

GND

FB

AP5727

C

OUT

10uF

R2

L1

22uH

D1

V

IN

4.7uF

R1

V

OUT

Figure 1. Typical Application Circuit