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A8434 Datasheet(PDF) 1 Page - Allegro MicroSystems

Part No. A8434
Description  6-Channel High Efficiency Charge Pump White LED Driver
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A8434 Datasheet(HTML) 1 Page - Allegro MicroSystems

 
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VIN
D1
D2
D3
D4
D5
D6
LED1
LED2
LED3
LED4
LED5
LED6
ENM
ENS
VOUT
GND
VIN
C2+
C2–
ISET
RSET
C1+
C1–
On/Off and
Dimming
Control
A8434
CIN
1 μF
VIN>Vf(max)+0.2V, Vf = LED forward drop
VBATT
2.7 to 5.5 V
CIN
1 µF
COUT
1 µF
1 µF
1 µF
D1
D2
D3
D4
D6
D5
LED1
LED2
LED3
LED4
LED5
LED6
ENM
ENS
VOUT
GND
VIN
C2+
C2–
ISET
RSET
C1+
C1–
On/Off and
Dimming
Control
A8434
C2
C1
D1-D4 Main Display; D5-D6 Sub Display
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×, 1.5×, and
), 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 × 3 mm footprint) ES package.
Applications include:
▪ White LED backlights for cellular phones, PDAs
▪ Digital cameras, camcorders
▪ Portable audio devices and MP3s
▪ Other portable device white LED backlighting
8434-DS, Rev. 1
Features and Benefits
▪ Proprietary adaptive control scheme (1×, 1.5×, 2×)
▪ 0.5% typical WLED current matching
▪ Drives up to 6 white LEDs
▫ Main display backlight (up to 6 WLEDs)
▫ Main display and sub display backlight
▫ Main display and low-current flash/torch
▪ 30 mA per WLED
▪ 2× serial dimming interfaces
▪ 320 mA charge pump capability
▪ Low EMI design and soft start function
▪ Short circuit, overvoltage, thermal shutdown protection
▪ 0.75 mm nominal height (very thin profile),
3 × 3 mm footprint packages
6-Channel High Efficiency Charge Pump White LED Driver
Package: 16 pin QFN/MLP (suffix ES)
Typical Applications
Approximate scale 1:1
A8434
VBATT
2.7 to 5.5 V
CIN
1 µF
COUT
1 µF
1 µF
1 µF
D1
D2
D3
D4
D6
D5
LED1
LED2
LED3
LED4
LED5
LED6
ENM
ENS
VOUT
GND
VIN
C2+
C2–
ISET
RSET
C1+
C1–
On/Off and
Dimming
Control
A8434
C2
C1
Figure 1.6×30 mA WLED display
Figure 3. High efficiency current sink
Figure 2. 4×30 mA main with 2×30 mA sub display


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