BIAS. A8230A Datasheet

A8230A Datasheet PDF


Part

A8230A

Description

ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT WHITE LED BIAS

Manufacture

AiT Semiconductor

Page 10 Pages
Datasheet
Download A8230A Datasheet


A8230A Datasheet
AiT Semiconductor Inc.
www.ait-ic.com
A8230A
ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT
WHITE LED BIAS
DESCRIPTION
The A8230A is a high performance ultra low-
dropout 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 components. This takes an advantage
of highest efficiency and creates no EMI
problem.
The A8230A is available in SOT-26 package.
FEATURES
Ultra Low 200mV Dropout at 20mA
0.6% High Accuracy Current Matching
20mA 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
AiT provides all Pb free products
Suffix “ v “ means Green Package
Figure 1
REV1.0
- JUN 2011 RELEASED -
-1-

A8230A Datasheet
AiT Semiconductor Inc.
www.ait-ic.com
PIN DESCRIPTION
A8230A
ULTRA LOW-DROPOUT CONSTANT-CURRENT WITHOUT
WHITE LED BIAS
PIN #
1
2
3
4
5
6
Symbol
LED2
GND
LED3
EN
VCC
LED1
Top View
Function
LED2 bias current input
Ground
LED3 bias current input
Enable Dimming control
Power supply
LED1 bias current input
REV1.0
- JUN 2011 RELEASED -
-2-


Features Datasheet pdf AiT Semiconductor Inc. www.ait-ic.com A 8230A ULTRA LOW-DROPOUT CONSTANT-CURREN T WITHOUT WHITE LED BIAS DESCRIPTION T he A8230A is a high performance ultra l owdropout constant current bias supply for white LEDs. It can be used as an al ternative to the simple ballast resisto rs in conventional parallel white LEDs applications. For dimming control, an e nable input pin is controlled by proces sor GPIO output pulses for 32 level lin ear 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 A8 230A is suitable for single cell Li-ion bat-tery power device that using low f orward voltage white LEDs. The white LE Ds can be powered directly from battery without extra external components. Thi s takes an advantage of highest efficie ncy and creates no EMI problem. The A82 30A is available in SOT-26 package. FE ATURES  Ultra Low 200mV Dropout at 2 0mA  0.6% High Accuracy Current Matching  20mA Full Scale Curre.
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