AP3029 Datasheet, PDF (1/16 Pages) BCD Semiconductor Manufacturing Limited – WHITE LED STEP-UP CONVERTER

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