AP3029KTR-G1 Просмотр технического описания (PDF) - BCD Semiconductor

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AP3029KTR-G1

WHITE LED STEP-UP CONVERTER

BCD Semiconductor 

WHITE LED STEP-UP CONVERTER

General Description

Features

Preliminary Datasheet

AP3029

The AP3029 is an inductor-based DC/DC converter

designed to drive up to six white LEDs in series or 2

rows of LEDs with 5 for each in parallel for backlight.

Only one feedback resistor is needed to control the

LED current and obtain required brightness.

A constant frequency 1.2MHz PWM control scheme is

employed in this IC, which means tiny external com-

ponents can be used. In fact, 1mm tall inductor and

0.22µF output capacitor for a typical application is suf-

ficient. Additionally, the schottky diode in boost circuit

is integrated on this chip. AP3029 also provides a dis-

able pin to ease its use for different systems.

· Inherently Uniform LED Current

· High Efficiency up to 83.5%

· No Need for External Schottky Diode

· Over Output Voltage Protection

· Drives 2 to 6 LEDs in Series or 2 Rows of LEDs

with 5 for Each in Parallel

· Fast 1.2MHz Switching Frequency

· Uses Tiny 1mm Tall Inductor

· Requires Only 0.22µF Output Capacitor

Applications

The over output voltage protection is equipped in

AP3029. When any LED is broken or in other abnor-

·

Cellular Phones

mal conditions, the output voltage will be clamped to · Digital Cameras

27V.

· LCD modules

· GPS Receivers

The AP3029 is available in standard SOT-23-6 and · PDAs, Handheld Computers

TSOT-23-6 packages.

SOT-23-6

TSOT-23-6

Aug. 2008 Rev. 1. 2

Figure 1. Package Type of AP3029

BCD Semiconductor Manufacturing Limited

1

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