A8230A
A8230A is ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT WHITE LED BIAS manufactured by AiT Semiconductor.
DESCRIPTION
The A8230A is a high performance ultra lowdropout constant current bias supply for white LEDs. It can be used as an alternative to the simple ballast resistors in conventional parallel white LEDs applications. For dimming control, an enable input pin is controlled by processor GPIO output pulses for 32 level linear current. Using a low frequency PWM waveform to this enable input pin also controls the average LED current which is proportional to the PWM duty. The A8230A is suitable for single cell Li-ion bat-tery power device that using low forward voltage white LEDs. The white LEDs can be powered directly from battery without extra external ponents. This takes an advantage of highest efficiency and creates no EMI problem.
The A8230A is available in SOT-26 package.
FEATURES
- Ultra Low 200m V Dropout at 20m A
- 0.6% High Accuracy Current Matching
- 20m A Full Scale Current
- 32 Level Linear Current Brightness Control
- PWM Brightness Control
- 2.5V to 6V Supply Voltage Range
- Thermal shutdown function
- Under-voltage protection function
- Available in SOT-26 Package
APPLICATION
- Mobile Phones
- White LED backlighting
- Camera Flash LED Lighting
TYPICAL APPLICATION
ORDERING INFORMATION
Package Type
Part Number
SOT-26
A8230AE6R E6
A8230AE6VR
Note
R: Tape & Reel V: Green Package
Ai T provides all Pb free products
Suffix “ v “ means Green Package
Figure 1
REV1.0
- JUN 2011 RELEASED
- -1-
Ai T Semiconductor Inc.
.ait-ic.
PIN DESCRIPTION
ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT WHITE LED BIAS
PIN # 1 2 3 4 5 6
Symbol LED2 GND LED3
EN VCC LED1
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