描述 Description

The MIC2870 is a high-current, high-efficiency flash LED driver for one or two high-brightness camera flash LEDs.The LED driver current is generated by an integrated inductive boost converter with 2MHz switching frequency which allows the use of a very-small inductor and output capacitor. These features make the MIC2870 an ideal solution for high-resolution camera phone LED flashlight driver applications.MIC2870 supports two 750mA white-LEDs (WLEDs) or a single 1.5A WLED configuration. When two WLEDs are connected, their currents are matched automatically.MIC2870 operates in either flash or torch modes that can be controlled through either an I2C interface or external pins. The brightness in the flash and torch mode can be adjusted via two external resistors individually. High-speed mode I2C interface provides a simple control at a clock speed up to 3.4MHz to support most camera functions such as auto-focus, white balance, and image capture (flash mode).The MIC2870 is available in 16-pin, 2mm × 2mm TQFN package with a junction temperature range of ?40°C to +125°C.

特性 Features

? Up to 1.5A flash LED driving current with a 2.7V to 5.0V input voltage range
? High-efficiency 2MHz VFadaptive boost driver
? Configurable 1 or 2 channel(s) WLED driver
? LED driving current soft-start
? Control through I2C interface or external pins
? Flash inhibit function for GSM pulse synchronization
? True load disconnect
? Flash time-out protection
? 1μA shutdown current
? Available in 16-pin 2mm × 2mm TQFN package

簡(jiǎn)介

MIC2870屬于集成電路（IC）的LED驅(qū)動(dòng)器。由制造生產(chǎn)的MIC2870LED 驅(qū)動(dòng)器器件屬于 LED 驅(qū)動(dòng)器電源管理集成電路 (PMIC) 系列，可通過(guò)標(biāo)稱固定電壓的電源為負(fù)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(duì)器件工作點(diǎn)進(jìn)行外部控制，可在照明應(yīng)用中用于實(shí)現(xiàn)調(diào)光功能。