LM27951中文资料输入电压范围为 2.8V-5.5V 的白光 LED 自适应 1.5X/1X 开关电容器电流驱动器数据手册TI规格书

描述 Description

The LM27951 is a switched capacitor white-LED driver capable of driving up to four LEDs with 30 mA through each LED. Its four tightly regulated current sources ensure excellent LED current and brightness matching. LED drive current is programmed by an external sense resistor. The LM27951 operates over an input voltage range from 2.8 V to 5.5 V and requires only four low-cost ceramic capacitors. The LM27951 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 LM27951 uses constant frequency pre-regulation to minimize conducted noise on the input. It has a fixed 750-kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1 µA of supply current when shut down. The LM27951 is available in a 14-pin no-pullback WSON package.For all available packages, see the orderable addendum at the end of the data sheet.

特性 Features

• Input Voltage Range: 2.8 V to 5.5 V
• Drives up to Four LEDs With up to 30 mA each
• Regulated Current Sources with 0.2% (Typical) Matching
• 3/2×, 1× Gain Transition Based on LED Vƒ
• Peak Efficiency Over 85%
• PWM Brightness Control
• Very Small Solution Size - No Inductor
• Fixed 750-kHz Switching Frequency
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