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PDF A8442 Data sheet ( Hoja de datos )
| Número de pieza | A8442 | |
| Descripción | 80mA 4-CHANNEL CHARGE PUMP WHITE LED DRIVER | |
| Fabricantes | AiT Semiconductor | |
| Logotipo |  |
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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-
1 page  
AiT Semiconductor Inc.
www.ait-ic.com
A8442
80mA 4-CHANNEL CHARGE PUMP WHITE
LED DRIVER WITH LOW DROPOUT CURRENT SOURCE
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 1. For 4-WLEDs Application Circuit
Figure 2. For 3-WLEDs Application Circuit
Figure 3. For more than 4-WLEDs Application Circuit
REV1.0
-APR 2011 RELEASED -
-5-
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet A8442.PDF ] | |
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