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AP3019A Datasheet(PDF) 1 Page - BCD Semiconductor Manufacturing Limited

Part # AP3019A
Description  WHITE LED STEP-UP CONVERTER
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Manufacturer  BCDSEMI [BCD Semiconductor Manufacturing Limited]
Direct Link  http://www.bcdsemi.com
Logo BCDSEMI - BCD Semiconductor Manufacturing Limited

AP3019A Datasheet(HTML) 1 Page - BCD Semiconductor Manufacturing Limited

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Data Sheet
WHITE LED STEP-UP CONVERTER
AP3019A
Mar. 2010 Rev. 1.7
BCD Semiconductor Manufacturing Limited
1
General Description
The AP3019A 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 1.2MHz PWM control scheme
is employed in this IC, which means tiny external
components can be used. Specifically, 1mm tall
inductor and 0.22
µF output capacitor for a typical
application is sufficient. Additionally, the Schottky
diode in boost circuit is integrated on this chip.
AP3019A also provides a disable pin to ease its use
for different systems.
The output over-voltage protection is implemented in
AP3019A. When any LED is broken or in other
abnormal conditions, the output voltage will be
clamped.
The AP3019A is available in standard SOT-23-6 and
TSOT-23-6 packages.
Features
Inherently Uniform LED Current
High Efficiency up to 84%
No Need for External Schottky Diode
Output Over-voltage Protection (OVP)
Fixed 1.2MHz Switching Frequency
Uses Tiny 1mm Tall Inductor
Requires Only 0.22
µF Output Capacitor
Applications
Cellular Phones
Digital Cameras
LCD modules
GPS Receivers
PDAs, Handheld Computers
Figure 1. Package Types of AP3019A
SOT-23-6
TSOT-23-6


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