CAT4137中文资料White LED Driver, CMOS Boost Converter数据手册ONSEMI规格书

描述 Description

The CAT4137 is a DC/DC step-up converter that delivers a regulated output current. Operation at a constant switching frequency of 1 MHz allows the device to be used with small value external ceramic capacitors and inductor.The device drives a string of white LEDs connected in series and provides the regulated current to control the LEDs with inherent uniform brightness and matching. An external resistor R1 sets the output current and allows up to 30 mA current to be supported over a wide range of input supply voltages from 2.2 V to 5.5 V, making the device ideal for battery-powered applications.LED dimming can be done by using a DC voltage, a logic signal, or a pulse width modulation (PWM) signal. The shutdown control pin allows the device to be placed in power-down mode with 'zero' quiescent current.In addition to thermal protection and overload current limiting, the device also enters a very low power operating mode during 'Open LED' fault conditions. The device is housed in a low profile (1 mm max height) 5-lead thin SOT23 package for space critical applications.

特性 Features

• Drives up to 5 White LEDs from 3V
• Power Efficiency up to 87%
• Low Quiescent Ground Current 0.1 mA
• Adjustable Output Current (up to 30 mA)
• High Frequency 1MHz Operation
• “Zero” current shutdown mode
• Operates down to 2 V (from two AA batteries)
• Soft start power-up
• Open LED low power mode
• Automatic shutdown at 1.9 V (UVLO)
• Thermal shutdown protection

应用 Application

• LCD Backlighting
• Mobile Phones
• Digital Still Cameras

简介

CAT4137属于集成电路（IC）的LED驱动器。由制造生产的CAT4137LED 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。