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A8442 데이터시트 PDF




AiT Semiconductor에서 제조한 전자 부품 A8442은 전자 산업 및 응용 분야에서
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부품번호 A8442 기능
기능 80mA 4-CHANNEL CHARGE PUMP WHITE LED DRIVER
제조업체 AiT Semiconductor
로고 AiT Semiconductor 로고


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A8442 데이터시트, 핀배열, 회로
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-




A8442 pdf, 반도체, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A8442
80mA 4-CHANNEL CHARGE PUMP WHITE
LED DRIVER WITH LOW DROPOUT CURRENT SOURCE
ELECTRICAL CHARACTERISTICS
TA = 25°C, Otherwise specified
Parameter
Symbol
Conditions
Min Typ Max
Input Supply Voltage
V IN
2.7 - 5.5
Undervoltage Lockout Threshold
VUVLO
VIN rising or falling
1.8 2.0 2.4
Undervoltage Lockout
Hysterresis
- 100 -
Shutdown Current
ISHDN
VIN = 4.2V, EN = LOW
- 1 10
Quiescent of x1 Mode
IQ×1
x1 Mode, VIN = 5.5V, LED off -
1
-
ILED Accuracy
ILED-ERR
2mA < ILED < 20mA
-28
Current Matching
ILED-LED-ERR 2mA < ILED < 30mA
-15
×1 mode to ×1.5 mode
Transition voltage(VIN falling)
VLED = 3.4V,
VTRANS
- 3.5 -
ILED1=ILED2=ILED3=ILED4=15mA
Oscillator Frequency
FOSC
VIN-VOUT
- 500K -
Output Over Voltage Protection
VOVP
- 5.5 6
Thermal Shutdown Threshold
- 150 -
Thermal Shutdown Hysteresis
- 10 -
EN Low Time for Shut Down
TSHDN
2- -
EN Low Time for Dimming
TLO
0.5 - 500
EN High Time for Dimming
THI
0.5 -
-
EN Threshold Logic-High
Voltage
VIH
1.5 -
-
EN Threshold Logic-Low
Voltage
VIL
- - 0.4
Unit
V
V
mV
uA
mA
%
V
HZ
V
mS
uS
uS
V
V
REV1.0
-APR 2011 RELEASED -
-4-

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A8442 전자부품, 판매, 대치품
AiT Semiconductor Inc.
www.ait-ic.com
A8442
80mA 4-CHANNEL CHARGE PUMP WHITE
LED DRIVER WITH LOW DROPOUT CURRENT SOURCE
DETAILED INFORMATION
The A8442 uses a fractional switched capacitor charge pump to power up to four white LEDs with a
programmable current for uniform intensity. The part integrates current sources and automatic mode selection
charge pump. It maintains the high efficiency by utilizing an x1/x1.5 fractional charge pump and 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 in white LED applications.
Brightness Control
The A8442 implements a pulse dimming method to control the brightness of white LEDs. 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.
Figure 4. Brightness control by pulse dimming
Figure 5. Examples of pulse adjust brightness
REV1.0
-APR 2011 RELEASED -
-7-

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