AP3029_09 Datasheet, PDF (1/16 Pages) BCD Semiconductor Manufacturing Limited – WHITE LED STEP-UP CONVERTER

WHITE LED STEP-UP CONVERTER
General Description
Features
Data Sheet
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.
The over output voltage protection is equipped in
AP3029. When any LED is broken or in other abnor-
mal conditions, the output voltage will be clamped.
The AP3029 is available in standard SOT-23-6 and
TSOT-23-6 packages.
· Inherently Uniform LED Current
· High Efficiency up to 83.5%
· No Need for External Schottky Diode
· Over Output Voltage Protection
· Fast 1.2MHz Switching Frequency
· Uses Tiny 1mm Tall Inductor
· Requires Only 0.22µF Output Capacitor
Applications
· Cellular Phones
· Digital Cameras
· LCD modules
· GPS Receivers
· PDAs, Handheld Computers
Oct. 2009 Rev. 1. 8
SOT-23-6
TSOT-23-6
Figure 1. Package Types of AP3029
BCD Semiconductor Manufacturing Limited
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