CAT3604A中文资料White LED Driver, 4-Channel, Regulated Charge Pump数据手册ONSEMI规格书

描述 Description

The CAT3604A is a charge pump operating in either 1x (LDO) mode or 1.5x fractional mode regulating current through each of the 4 LED pins. Operation at a fixed high frequency of 1 MHz typical allows the use of very small value ceramic capacitors.The CAT3604A drives white light-emitting diodes (LEDs) connected in parallel and provides tightly matched regulated current to achieve uniformity of brightness in LCD backlighting applications. An external resistor RSET controls the output current level. LED currents of up to 30 mA are supported over a range of input supply voltages from 3 V to 5.5 V, making the device ideal for battery-powered applications.LED dimming can be accomplished by several methods including using a DC voltage to set the RSET pin current, applying a PWM signal on the Control signals, or adding a switched resistor in parallel with RSET. The Enable input pin allows the device to be placed in power-down mode with ''zero'' quiescent current.The CAT3604A features short circuit and overcurrent limiting protection. The device is available in a 16-pad TQFN package with a max height of 0.8 mm.

特性 Features

• Drives Individually up to 4 LEDs
• Output Current up to 30 mA per LED
• Compatible with Supply Voltage of 3 V to 5.5 V
• Power Efficiency up to 93%
• 2 Modes of Operation 1x and 1.5x
• LED On/Off by Control Lines
• High-frequency Operation at 1 MHz
• Low Value Ceramic Capacitors
• 604 Compatible Pinout
• Soft Start and Current Limiting

应用 Application

• Color LCD and Keypad Backlighting
• Mobile Phones
• Digital Cameras
• Portable MP3 Players

简介

CAT3604A属于集成电路（IC）的LED驱动器。由制造生产的CAT3604ALED 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。