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 CapacitorApplication· Cellular Phones· Dig...
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 ...
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Parameter |
Symbol |
Value |
Unit |
Input Voltage |
VIN |
20 |
V |
SW Voltage FB Voltage CTRL Voltage |
30 20 20 |
V V V | |
Thermal Resistance (Junction to Atmosphere, no Heat sink) |
RJA |
265 |
°C/W |
Operating Junction Temperature |
150 |
°C | |
Storage Temperature Range Lead Temperature (Soldering, 10sec) |
TSTG TLEAD |
-65 to 150 260 |
°C °C |
ESD (Machine Model) ESD (Human Body Model) |
250 2000 |
V V |
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods may affect device reliability.
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.