CAT4004B数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The CAT4003B and CAT4004B provide respectively three and four matched low dropout current sources to drive LEDs. The CAT400XB requires no external RSET resistor. The LED current is internally set to 25 mA when the device is first enabled. 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 input supports the 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 (75 mV at 20 mA) current sinks. Package options are available in the 4-channel tiny 8-pad UDFN 2 mm x 2 mm with a max height of 0.55 mm, and 3- channel in the 6-lead TSOT-23, TSOP and SC-70.

特性 Features

• Low Dropout Driver 75 mV at 20 mA
• Can drive LEDs at lower VIN
• Dimming via 1-wire EZDimTM Interface
• higher resolution dimming
• 3, 4 LED Current Sinks with Tight Matching
• 32 Dimming Levels
• No Switching Noise
• Shutdown Current less than 1 µA
• 25 mA Max LED Current per Channel
• Thermal Shutdown Protection

应用 Application

• LCD Display Backlight
• Mobile Phones
• Digital Still Cameras

简介

CAT4004B属于集成电路（IC）的LED驱动器。由制造生产的CAT4004BLED 驱动器器件属于 LED 驱动器电源管理集成电路 (PMIC) 系列，可通过标称固定电压的电源为负载（通常为发光二极管）提供电流，并且电流可控。它与用于电压调节的类似产品的主要区别在于，这类器件提供较低的反馈电压（以提高系统能效），而且通常可对器件工作点进行外部控制，可在照明应用中用于实现调光功能。