GENERAL DESCRIPTION

The ADP1655 is a very compact, highly efficient, dual white LED flash driver for high resolution camera phones, which improves picture and video quality in low light environments. The device integrates a 2 MHz synchronous inductive boost convertor, an I2C-compatible interface and a 500 mA current source. The high switching frequency enables the use of a tiny, low profile 2.2 μH power inductor, and the current source permits LED cathode grounding for thermally enhanced, low EMI and compact layouts.

FEATURES

Ultracompact solution

Small 2 mm × 1.5 mm 12-ball WLCSP package

Tiny, low profile 2.2 μH power inductor

LED current source for local LED grounding and low EMI

Synchronous 2 MHz PWM boost convertor, no external diode

High efficiency: 88 peak

Reduces high levels of input battery current during flash

Limits battery current drain in torch mode

I2C programmable

Currents up to 400 mA in flash mode for two LEDs

Currents up to 500 mA in flash mode for one LED with 5 accuracy

Currents up to 160 mA in torch mode with 10 accuracy

Peak inductor current limit

Flash timer

Control

I2C-compatible control registers

External STROBE pin

External direct TORCH pin

TX_MASK input to prevent high input battery current levels

Safety

Thermal overload protection

Flash timeout

Inductor fault detection

Output overvoltage

Short circuit protection

Soft start reduces inrush input current

APPLICATIONS

Camera-enabled cellular phones and smart phones

Digital still cameras, camcorders, and PDAs