描述 Description

The CAT4002A provides a two matched low dropout current sources to drive LEDs. The CAT4002A uses an external resistor RSET to set the current in the LED channels. Each LED channel includes an individual control loop allowing the device to handle a wide range of LED forward voltages while still maintaining tight current matching.The EN/DIM logic inputs supports device enable and a digital dimming interface for setting the LED channel current with 32 linear dimming levels.LEDs can be powered directly from a Lithium-ion battery due to the low dropout (50 mV at 20 mA) current sinks. The device is available in the 6-lead TSOT-23 and SC-70.

特性 Features

? Low Dropout Driver 50 mV at 20 mA
? Can drive LEDs at lower supply voltage VIN.
? Dimming via 1-wire EZDim Interface
? higher resolution dimming.
? 2 LED Current Sinks with Tight Matching
? 32 Dimming Levels
? No Switching Noise
? Shutdown Current less than 1 μA
? LED Current set by External Resistor
? Thermal Shutdown Protection

應(yīng)用 Application

? LCD Display Backlight
? Mobile Phones
? Digital Still Cameras

簡(jiǎn)介

CAT4002A屬于集成電路（IC）的LED驅(qū)動(dòng)器。由制造生產(chǎn)的CAT4002ALED 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?？蓪?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。