LM27952 - 白光 LED 自适应 1.5X/1X 开关电容器电流驱动器

LM27952是TI德州仪器公司的一款背光产品，LM27952是白光 LED 自适应 1.5X/1X 开关电容器电流驱动器，本站介绍了LM27952的封装应用图解、特点和优点、功能等，并给出了与LM27952相关的TI元器件型号供参考。

LM27952 - 白光 LED 自适应 1.5X/1X 开关电容器电流驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM27952 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED. Its 4 tightly regulated current sinks ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27952 operates over an input voltage range from 3.0V to 5.5V and requires only four low-cost ceramic capacitors.

The LM27952 provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in a gain of 1. Maximum efficiency is achieved over the input voltage range by actively selecting the proper gain based on the LED forward voltage requirements.

The LM27952 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750kHz switching frequency optimized for portable applications. The LM27952 consumes less than 1µA of supply current when shut down.

The LM27952 is available in a 14-pin No-Pullback Leadless Leadframe Package: WSON-14.

产品特性

Drives up to 4 LEDs with up to 30mA each
Regulated current sources with 0.2%(typ.) matching
3/2x, 1x Gain transition based on LED VF
Peak Efficiency Over 85%
Input Voltage Range: 3.0V to 5.5V
PWM Brightness Control
Very Small Solution Size - NO INDUCTOR
Fixed 750kHz Switching Frequency
<1µA Shutdown Current
14-pin WSON Package: 4.0mm X 3.0mm X 0.8mm

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