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AP3009

BCD Semiconductor
Part Number AP3009
Manufacturer BCD Semiconductor
Description WHITE LED STEP-UP CONVERTER
Published May 3, 2007
Detailed Description Data Sheet WHITE LED STEP-UP CONVERTER General Description The AP3009 is an inductor-based DC/DC converter designed to d...
Datasheet PDF File AP3009 PDF File

AP3009
AP3009

Overview
Data Sheet WHITE LED STEP-UP CONVERTER General Description The AP3009 is an inductor-based DC/DC converter designed to drive up to six white LEDs in series for backlight.
Only one feedback resistor is needed to control the LED current and obtain satisfied brightness.
A constant frequency 1.
2MHz PWM control scheme is employed in this IC, which means the tiny external components can be used.
In fact, 1mm tall inductor and 0.
22µF output capacitor for the typical application is very appropriate.
Additionally, the schottky diode in boost circuit is integrated in this chip.
AP3009 also provide a disable port to ease its use for different systems.
The over output voltage protection is equipped in AP3009.
When any LED is broken or in other abnormal conditions, the output voltage will be clamped to 30V.
The AP3009 is available in standard SOT-23-6 package.
www.
DataSheet4U.
com AP3009 Features · · · · · · · · Inherently Uniform LED Current High Efficiency: 83% Typical No Need for Extra Schottky Diode Over Output Voltage Protection Drives 2 to 6 LEDs 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 SOT-23-6 Figure 1.
Package Type of AP3009 Apr.
2007 Rev.
1.
4 1 BCD Semiconductor Manufacturing Limited Data Sheet WHITE LED STEP-UP CONVERTER Pin Configuration K Package (SOT-23-6) AP3009 VOUT GND FB 1 2 3 6 5 4 SW VIN CTRL Figure 2.
Pin Configuration of AP3009 (Top View) Pin Description Pin Number 1 2 3 4 5 6 Pin Name VOUT GND FB CTRL VIN SW Function Output Pin.
Connected to the cathode of internal schottky diode Ground Pin Voltage Feedback.
Reference voltage is 200mV Shutdown and Dimming Pin.
Connect to 1.
8V or higher to enable device; Connect to 50mV or less to disable device; Connect to a voltage between 1.
8V and 50mV to achieve linear dimming Input Supply Pin.
Must be locally bypassed Switch Pin.
Connect externa...


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