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

ADP1655屬于集成電路（IC） > LED 驅(qū)動器。亞德諾半導體技術(shù)有限公司制造生產(chǎn)的ADP1655LED 驅(qū)動器器件屬于 LED 驅(qū)動器電源管理集成電路 (PMIC) 系列，可通過標稱固定電壓的電源為負載（通常為發(fā)光二極管）提供電流，并且電流可控。它與用于電壓調(diào)節(jié)的類似產(chǎn)品的主要區(qū)別在于，這類器件提供較低的反饋電壓（以提高系統(tǒng)能效），而且通常可對器件工作點進行外部控制，可在照明應(yīng)用中用于實現(xiàn)調(diào)光功能。