AP3019 Datasheet, PDF (1/15 Pages) BCD Semiconductor Manufacturing Limited – WHITE LED STEP-UP CONVERTER

WHITE LED STEP-UP CONVERTER
General Description
Features
Preliminary Datasheet
AP3019
The AP3019 is an inductor-based DC/DC converter
designed to drive up to five white LEDs in series for
backlight. Only one feedback resistor is needed to con-
trol the LED current and obtain satisfied brightness.
A constant frequency 1.0MHz 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. AP3019 also
provides a disable port to ease its use for different sys-
tems.
· Inherently Uniform LED Current
· High Efficiency up to 84%
· No Need for Extra Schottky Diode
· Over Output Voltage Protection
· Drives 2 to 5 LEDs
· Fast 1.0MHz Switching Frequency
· Uses Tiny 1mm Tall Inductor
· Requires Only 0.22µF Output Capacitor
Applications
The over output voltage protection is equipped in ^{· Cellular Phones}
AP3019. When any LED is broken or in other abnor- ^{· Digital Cameras}
mal conditions, the output voltage will be clamped to ^{· LCD modules}
27V.
· GPS Receivers
· PDAs, Handheld Computers
The AP3019 is available in standard SOT-23-6 pack-
age.
Apr. 2007 Rev. 1. 1
SOT-23-6
Figure 1. Package Type of AP3019
BCD Semiconductor Manufacturing Limited
1