CAT3644数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The CAT3644 is a high efficiency fractional charge pump that can drive up to four LEDs programmable by a one wire digital interface. The inclusion of a 1.33x fractional charge pump mode increases device efficiency by up to 10% over traditional 1.5x charge pumps with no added external capacitors. Low noise input ripple is achieved by operating at a constant switching frequency which allows the use of small external ceramic capacitors. The multi-fractional charge pump supports a wide range of input voltages from 2.5 V to 5.5 V. The EN/DIM logic input functions as a chip enable and a digital dimming interface for current setting of all LEDs. Six different current ratios are available via the interface.

特性 Features

• High efficiency 1.33x charge pump
• Quad-mode charge pump: 1x, 1.33x, 1.5x, 2x
• Drives up to 4 LEDs at 25 mA each
• 1-wire EZDim™ LED current programming
• Power efficiency up to 92%
• Low noise input ripple in all modes
• “Zero” current shutdown mode
• Soft start and current limiting
• Short circuit protection
• Thermal shutdown protection

应用 Application

LCD Display Backlight

简介

CAT3644属于集成电路（IC）的LED驱动器。由制造生产的CAT3644LED 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。