Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Dec., 2010

APW7136A/B/C

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

1MHz, High-Efficiency, Step-Up Converter for 2 to 8 White LEDs

The APW 7136A/B/C also integrates under-voltage

lockout, over-temperature protection, and current-limit

circuits. The APW7136/A/B/C is available in a SOT-23-6

packages.

Features

•

Wide Input Voltage from 2.7V to 6V

•

0.25V Reference Voltage

•

Fixed 1MHz Switching Frequency

•

High Efficiency up to 87%

•

100Hz to 100kHz PWM Brightness Control

Frequency

•

Open-LED Protection

•

Under-Voltage Lockout Protection

•

Over-Temperature Protection

•

<1

µA Quiescent Current Dduring Shutdown

•

SOT-23-6 Packages

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

•

White LED Display Backlighting

•

Cell Phone and Smart Phone

•

PDA, PMP, MP3

•

Digital Camera

Simplified Application Circuit

Pin Configuration

The APW7136A/B/C is a current-mode and fixed frequency

boost converter with an integrated N-FET to drive up to 8

white LEDs in series.

The series connection allows the LED current to be iden-

tical for uniform brightness. Its low on-resistance of N-

FET and feedback voltage reduce power loss and achieve

high efficiency. Fast 1MHz current-mode PWM operation

is available for input and output capacitors and a small

inductor while minimizing ripple on the input supply. The

OVP pin monitors the output voltage and stops switching

if exceeds the over-voltage threshold. An internal soft-

start circuit eliminates the inrush current during start-up.

GND

VIN

V

OUT

EN

LX

FB

OVP

4

6

5

3

2

1

L1

22

µH

C2

1

µF

C1

4.7

µF

R1

12

Ω

V

IN

Up to 8

WLEDs

OFF ON

4 EN

6 VIN

GND 2

5 OVP

FB 3

LX 1

SOT-23-6 Top View