Preliminary Datasheet
WHITE LED STEP-UP CONVERTER
General Description
The AP3036/A 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
AP3036/A also provides a disable pin to ease its use
for different systems.
The output over-voltage protection is implemented in
AP3036/A. When any LED is broken or in other
abnormal conditions, the output voltage will be
clamped.
The AP3036/A is available in standard SOT-23-6 and
TSOT-23-6 packages.
AP3036/A
Features
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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
Applications
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Cellular Phones
Digital Cameras
LCD Modules
GPS Receivers
PDAs, Handheld Computers
SOT-23-6
TSOT-23-6
Figure 1. Package Types of AP3036/A
Sep. 2011
Rev. 1.2.
1
BCD Semiconductor Manufacturing Limited
BCDSEMI [ BCD SEMICONDUCTOR MANUFACTURING LIMITED ]
