鈻?/div>
0.75 mm nominal height (very thin profile),
3 脳 3 mm footprint packages
Description
The A8434 high efficiency charge pump ICs offer a simple,
low-cost WLED (white LED) driver solution for driving up to
six WLEDs in various application configurations, either all six
backlighting a single display, or for multiple displays, such as
four WLEDs as the main display backlight, with the other two
WLEDs used for backlighting a sub display or a low-current
flash/torch. Using a proprietary control scheme (
1脳, 1.5脳, and
2脳
), the A8434 can deliver well-matched WLED current while
maintaining the highest efficiency and low EMI.
The WLED current is regulated over the entire range of Li+
battery voltage to provide uniform intensity. WLED brightness
and on/off can be controlled for the main display and sub
display/torch through 2 single-wire serial interface pins.
The A8434 is available in an QFN/MLP-16 space-conserving
(3 脳 3 mm footprint) ES package.
Applications include:
鈻?/div>
鈻?/div>
鈻?/div>
鈻?/div>
White LED backlights for cellular phones, PDAs
Digital cameras, camcorders
Portable audio devices and MP3s
Other portable device white LED backlighting
Package: 16 pin QFN/MLP (suffix ES)
Approximate scale 1:1
Typical Applications
VBATT
2.7 to 5.5 V
VIN
CIN
1 碌F
C1
1 碌F
C1+
C1鈥?/div>
C2
1 碌F
VOUT
LED1
LED2
D1
D2
D3
D4
D5
D6
ENS
GND
LED6
VBATT
2.7 to 5.5 V
VIN
CIN
1 碌F
C1
1 碌F
C1+
C1鈥?/div>
VOUT
LED1
D1
D2
D3
D4
D5
D6
ENS
GND
LED6
COUT
1 碌F
RSET
On/Off and
Dimming
Control
CIN
1
渭F
COUT
1 碌F
VIN
VIN
C1+
C1鈥?/div>
VOUT
LED1
LED2
D1
D2
D3
D4
D5
D6
C2+
A8434
LED3
C2鈥?/div>
LED4
ISET
ENM
LED5
C2+
A8434
LED3
C2鈥?/div>
LED4
ISET
ENM
ENS
GND
LED5
LED6
RSET
On/Off and
Dimming
Control
V
IN
>V
f
(max)+0.2 V, V
f
= LED forward drop
Figure 1.6 脳 30 mA WLED display
C2
1 碌F
LED2
C2+
A8434
LED3
C2鈥?/div>
LED4
ISET
ENM
LED5
Figure 3. High efficiency current sink
RSET
On/Off and
Dimming
Control
D1-D4 Main Display; D5-D6 Sub Display
Figure 2. 4 脳 30 mA main with 2 脳 30 mA sub display
8434-DS, Rev. 1
A8434EESTR-T 產(chǎn)品屬性
1
集成電路 (IC)
PMIC - LED 驅(qū)動器
-
-
-
切換式電容器（充電泵）
6
是
背光，閃燈/白光
白色 LED
1MHz
2.7 V ~ 5.5 V
-
表面貼裝
16-WFQFN 裸露焊盤
16-QFN/MLP 裸露焊盤（3x3）
Digi-Reel®
-40°C ~ 85°C
620-1188-6
A8434EESTR-T相關(guān)型號PDF文件下載
-
型號
版本
描述
廠商
下載
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英文版
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Photoflash Capacitor Charger with IGBT Driver and Refresh
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Photoflash Capacitor Charger with IGBT Driver
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White LED Driver Constant Current Step-up Converter
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White LED Driver Constant Current Step-up Converter
ALLEGRO [A...
ALLEGRO
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