AP3036B

Document number: DS37004 Rev. 1 - 2

1 of 11

www.diodes.com

March 2014

© Diodes Incorporated

AP3036B

A Product Line of

Diodes Incorporated

WHITE LED STEP-UP CONVERTER

Description

The AP3036B is an inductor-based DC/DC converter designed to

drive up to eight white LEDs in series for backlight. Only one

feedback resistor is needed to control the LED current and obtain

required brightness.

A constant frequency 1.0MHz PWM control scheme is employed in

this IC, which means tiny external components can be used.

Specifically, 1mm tall inductor and 0.22µF output capacitor for a

typical application is sufficient. Additionally, the Schottky diode in

boost circuit is integrated on this chip. The AP3036B also provides a

disable pin to ease its use for different systems.

The output over-voltage protection is implemented in AP3036B. When

any LED is broken or in other abnormal conditions, the output voltage

will be clamped.

The AP3036B is available in standard SOT26 package.

Applications



Cellular Phones



Digital Cameras



LCD Modules



GPS Receivers



PDAs, Handheld Computers

Pin Assignments

(Top View)

SW

GND

FB

CTRL

VOUT

VIN

1

2

3

4

5

Pin 1 Mark

6

SOT26

Features



Inherently Uniform LED Current



High Efficiency up to 84%



No Need for External Schottky Diode



Output Over-voltage Protection (OVP)



Fixed 1.0MHz Switching Frequency



Uses Tiny 1mm Tall Inductor



Requires Only 0.22µF Output Capacitor



High Frequency Dimming Control



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free. “Green” Device (Note 3)

Notes:

1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"

and Lead-free.

3. Halogen- and Antimony-

free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

22

1

F

0.22

F

10



VIN

SW

VOUT

FB

GND

CTRL

AP3036B

Control

Signal

L

C

IN

C

OUT

Note 4: C: X5R or X7R type dielectric, L: SUMIDA CDRH5D28R-220NC or equivalent. And, this circuit can work in full temperature.