CAT3649数据手册集成电路（IC）的LED驱动器规格书PDF

描述 Description

The CAT3649 is a high efficiency fractional charge pump that can drive up to six LEDs. The inclusion of a 1.33x fractional charge pump mode increases the 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 2.4 V to 5.5 V.The LED current can be adjusted in different ways. The full-scale LED current is set to 25 mA once the device is enabled. Analog dimming in 32 linear steps is achieved via a 1-wire pulse-dimming input (ADIM). Further adjustment of the LED current can be done by applying a pulse width modulation (PWM) signal on the PWM input. The PWM dimming control is compatible with content adaptive brightness control (CABC) for a wide range of PWM signal frequency up to 200 kHz.The CAT3649 can be shut down by holding the ADIM or PWM input in a logic low condition for greater than 30 ms.

特性 Features

• High Efficiency 1.33x Charge Pump
• Highest efficiency charge pump.
• Drives up to 6 LEDs at 25 mA Each
• Compatible with larger size LCD used in smartphones.
• PWM Dimming 100 Hz to 200 kHz for CABC
• PWM dimming control compatible with content adaptive brightness control (CABC).
• Quad-mode Charge Pump: 1x, 1.33x, 1.5x, 2x
• 1-wire EZDimTM 32 Linear Steps (ADIM)
• 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
• Mobile Phones
• Digital Still Cameras

简介

CAT3649属于集成电路（IC）的LED驱动器。由制造生产的CAT3649LED 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。