Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver
Description
A8530
Ultracompact 6-Channel Backlight and Flash/Torch White LED Driver
Features and Benefits
▪ Proprietary adaptive control scheme (1×, 1.
5×, 2×) ▪ 0.
5% typical LED current matching ▪ 2 separate serial interfaces for dimming control ▪ Drives up to 6 white LEDs (4 display backlight, 2 flash/torch) ▪ 30 mA per LED channel for display backlight ▪ 100 mA per LED channel for flash/torch backlight ▪ 320 mA total output current capability ▪ Low EMI design and soft-start function ▪ Short circuit, overvoltage, thermal shutdown protection ▪ 0.
75 mm very thin profile, 3 mm × 3 mm package
Package: 16 pin QFN/MLP (suffix ES)
Description
The A8530 high efficiency charge pump ICs offer a simple, low-cost white LED driver solution for driving four display backlight and two flash/torch/video mode white LEDs.
Using a proprietary control scheme (1×, 1.
5×, and 2×), the A8530 can deliver well-matched LED current while maintaining the highest efficiency and low EMI.
The LED current is regulated over the entire range of Li+ battery voltage to provide uniform intensity.
LED brightness and on/off can be controlled for 4 display backlight LEDs and 2 flash/torch LEDs through 2 single-wire serial interface pins.
The A8530 is available in a very thin profile (0.
75 mm nominal height) 3 mm× 3 mm QFN/MLP 16 pin package.
Applications include:
▪ White LED backlights for cellular phones, PDAs ▪ Digital cameras, camcorders ▪ Other portable device white LED backlighting ▪ 320 mA WLED flash/torch
Approximate Scale 1:1
Typical Applications
VBATT 2.
7 to 5.
5 V
CIN 4.
7 µF
C1 1 µF
C2 1 µF
RSET
On/Off and Dimming Control
VIN
VOUT
COUT 4.
7 µF
C1+
D1 LED1
C1–
D2
LED2
C2+ A8530
D3
LED3
C2–
D4
LED4
ISET
D5
ENM
LED5
D6
ENF GND LED6
D1-D4 Backlight; D5-D6 Flash
Figure 1.
4 × 30 mA backlight with 2 × 100 mA flash
VBATT 2.
7 to 5.
5 V
CIN 4.
7 µF
C1 1 µF
C2 1 µF
RSET
On/Off and Dimming Control
VIN
VOUT
COUT 4.
7 µF
C1+
D1 LED1
C1– LED2
C2+ A8530
LED3 C2–
ISET
LED4
D5
ENM
LE...
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