AL3158中文资料low-voltage-dc-dc-led-drivers数据手册Diodes规格书

描述 Description

The AL3158 is a low noise, constant frequency charge pump DC/DC converter that uses a Dual mode load switch (1X), and (2X) conversion for white LED applications. The AL3158 is capable of driving three groups of three LED channels at 20mA from a 2.7V to 5.5V input. The current sinks may be operated using three simple PWM dimming inputs individually or in parallel for driving higher-current LEDs. Low external part counts (one 1µF flying capacitor and two 2.2µF capacitors at VIN and VOUT) make this part ideally suited for small, battery-powered applications. AL3158 enable inputs are used to enable, disable device and dim the LED current with a fixed DC current of 20mA. Each output of the AL3158 is equipped with built-in protection for VOUT short circuit and auto-disable for LED short conditions. Built-in soft-start circuitry prevents excessive inrush current during start-up and mode switching. A low-current shutdown feature disconnects the load from VIN to reduce quiescent current less than 1µA. The AL3158 is available in a lead-free, space-saving, thermally enhanced 20-pin 3 x 3mm QFN package.

特性 Features

VIN Range: 2.7V to 5.5V
Up to 93% Max Power Efficiency
1% Current Matching Accuracy Between Channels
Drives up to 9 Channels of LEDs in 3 x 3-Channels combinations
Versatile 3-wire logic decoding of °C current control
Short circuit, Thermal and UVLO Protection

应用 Application

Mobile Phone White LED Backlighting and Indicators
RGB LED driving
PDA White LED Backlighting
Battery-operated Phone Main and Sub Screen White LED Backlighting

简介

AL3158属于集成电路（IC）的LED驱动器。由制造生产的AL3158LED 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。