A8442 Datasheet PDF


Part Number

A8442

Description

80mA 4-CHANNEL CHARGE PUMP WHITE LED DRIVER

Manufacture

AiT Semiconductor

Total Page 10 Pages
PDF Download
Download A8442 Datasheet PDF


Features Datasheet pdf AiT Semiconductor Inc. www.ait-ic.com A 8442 80mA 4-CHANNEL CHARGE PUMP WHITE L ED DRIVER WITH LOW DROPOUT CURRENT SOUR CE DESCRIPTION FEATURES The A8442 is a high performance white LED driver. I t integrates current sources and automa tic mode selection charge pump. The par t maintains the high efficiency by util izing an x1/x1.5 fractional charge pump and low dropout current sources. The s mall equivalent x1 mode open loop resis tance and ultra-low dropout voltage of current source extend the operating tim e of x1 mode and optimize the efficienc y of Li-ion battery in white LED applic ations. The A8442 supports up to 4 whit e LEDs and regulates a constant current for uniform intensity. The part imp.
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A8442 Datasheet
AiT Semiconductor Inc.
www.ait-ic.com
A8442
80mA 4-CHANNEL CHARGE PUMP WHITE
LED DRIVER WITH LOW DROPOUT CURRENT SOURCE
DESCRIPTION
FEATURES
The A8442 is a high performance white LED driver. It
integrates current sources and automatic mode
selection charge pump. The part maintains the high
efficiency by utilizing an x1/x1.5 fractional charge
pump and low dropout current sources. The small
equivalent x1 mode open loop resistance and
ultra-low dropout voltage of current source extend the
operating time of x1 mode and optimize the efficiency
of Li-ion battery in white LED applications.
The A8442 supports up to 4 white LEDs and
regulates a constant current for uniform intensity. The
part implements a 4-bit DAC for brightness control.
Users can easily configure the LED current from
1.25mA to 20mA by a serial pulse. The dimming of
white LEDs current can be achieved by applying a
pulse signal to the EN pin. There are totally 16 steps
of current could be set by users. The operating
voltage range is 2.7V to 5.5V. Internal soft start
circuitry effectively reduces the in-rush current while
both start-up and mode transition. The load is
disconnected from VIN while shutdown and the
shutdown current is less than 1μA.
90% Average Efficiency Over Battery Life
Support up to 4 White LEDs
80mV Typical Current Source Dropout
Support up to 80mA Output Current
2% Typical LED Current Accuracy
1% Typical LED Current Matching
High Active
Soft Start Function
Auto Charge Pump Mode Selection
500kHz Fixed Frequency Oscillator
Output Over Voltage Protection
16-Step Brightness Control
Low Input Noise and EMI
Low 1μA Shutdown Current
Available in QFN16(3x3) Package
APPLICATION
Mobile Phone, DSC, MP3
White LED Backlighting
LCD Display Supply
The A8442 is available in QFN16(3x3) package.
TYPICAL APPLICATION
ORDERING INFORMATION
Package Type
Part Number
QFN16(3x3)
A8442Q16R
A8442Q16VR
Note
R: Tape & Reel
V: Green Package
AiT provides all Pb free products
Suffix “ V “ means Green Package
REV1.0
-APR 2011 RELEASED -
-1-




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