Copyright

© ANPEC Electronics Corp.

Rev. A.2 - Jan., 2008

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

package.

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 fre-

quency

•

Open-LED Protection

•

Under Voltage Lockout Protection

•

Over Temperature Protection

•

<1

µA Quiescent Current during Shutdown

•

SOT-23-6 Package

•

Lead Free Available (RoHS Compliant)

Applications

General Description

•

White LED Display Backlighting

•

Cell Phone and Smart Phone

•

PDA, PMP, MP3

•

Digital Camera

Simplified Application Circuit

Ordering and Marking Information

Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which are fully

compliant with RoHS and compatible with both SnPb and lead-free soldering operations. ANPEC lead-free products meet or exceed the lead-

free requirements of IPC/JEDEC J STD-020C for MSL classification at lead-free peak reflow temperature.

Pin Configuration

4 EN

6 VIN

GND 2

5 OVP

FB 3

LX 1

SOT-23-6 Top View

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 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 stop 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

APW7136YCI :

Y - OVP Voltage Code

X - Date Code

OVP Voltage Code

A: 20V

B: 28V

C: 35V

Package Code

C : SOT-23-6

Operating Ambient Temperature Range

Handling Code

TR : Tape & Reel

Lead Free Code

L : Lead Free Device

CFYX

APW7136

Handling Code

Temperature Range

Package Code

Lead Free Code

OVP Voltage Code