Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Dec., 2009

APW7207

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 6 White LEDs

The APW7207 is a current-mode and fixed frequency

boost converter with an integrated N-FET to drive up to 6

white LEDs in series.

Features

•

Wide Input Voltage from 2.5V to 6V

•

0.2V Reference Voltage

•

Fixed 1MHz Switching Frequency

•

High Efficiency up to 88%

•

100Hz to 100kHz PWM Brightness Control Fre-

quency

•

Open-LED Protection

•

Under-Voltage Lockout Protection

•

Over-Temperature Protection

•

<1

µA Quiescent Current During Shutdown

•

TSOT-23-6A Packages

•

Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

•

White LED Display Backlighting

•

Cell Phone and Smart Phone

•

PDA, PMP, and MP3

•

Digital Camera

Simplified Application Circuit

Pin Configuration

The series connection allows the LED current to be iden-

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

FET and feedback voltage reduces power loss and

achieves 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 inter-

nal soft-start circuit eliminates the inrush current during

start-up.

The APW7207 also integrates under-voltage lockout,

over-temperature protection, and current limit circuits.

The APW7207 is available in TSOT-23-6A packages.

GND

VIN

V

OUT

EN

LX

FB

OVP

4

6

5

3

2

1

L1

22

µH

C2

1

µF

C1

2.2

µF

R1

10

Ω

V

IN

Up to 6

WLEDs

OFF ON

4 EN

6 VIN

GND 2

5 OVP

FB 3

LX 1

TSOT-23-6A

(Top View)