VBATT

CIN

1 μF

D1

D2

D3

D4

D6

D5

LED1

LED2

LED3

LED4

LED5

LED6

ENM

ENF

VOUT

GND

VIN

C2+

C2–

ISET

RSET

C1+

C1–

On/Off and

Dimming

Control

A8530

D1-D4 Main; D5-D6 Flash

Approximate Scale 1:1

Figure 4. High efficiency current sink

Typical Applications

VBATT

2.7 to 5.5 V

CIN

4.7 µF

COUT

4.7 µF

1 µF

1 µF

D1

LED1

LED2

LED3

LED4

LED5

LED6

ENM

ENF

VOUT

GND

VIN

C2+

C2–

ISET

RSET

C1+

C1–

A8530

C2

C1

On/Off and

Dimming

Control

VBATT

2.7 to 5.5 V

CIN

4.7 µF

COUT

4.7 µF

1 µF

1 µF

D1

D6

D5

LED1

LED2

LED3

LED4

LED5

LED6

ENM

ENF

VOUT

GND

VIN

C2+

C2–

ISET

RSET

C1+

C1–

A8530

C2

C1

D1-D4 Backlight; D5-D6 Flash

On/Off and

Dimming

Control

Figure 2. 3×100 mA flash

Figure 3. 320 mA flash

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.

TheA8530 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

8530-DS

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

Ultracompact 6-Channel Backlight

and Flash/Torch White LED Driver

Package: 16 pin QFN/MLP (suffix ES)

A8530

VBATT

2.7 to 5.5 V

CIN

4.7 µF

COUT

4.7 µF

1 µF

1 µF

D1

D2

D3

D4

D6

D5

LED1

LED2

LED3

LED4

LED5

LED6

ENM

ENF

VOUT

GND

VIN

C2+

C2–

ISET

RSET

C1+

C1–

On/Off and

Dimming

Control

A8530

C2

C1

D1-D4 Backlight; D5-D6 Flash

Figure 1. 4×30 mA backlight with 2×100 mA flash