LM27965 - 具有 I2C 兼容亮度控制的双路显示白光 LED 驱动器

LM27965是TI德州仪器公司的一款背光产品，LM27965是具有 I2C 兼容亮度控制的双路显示白光 LED 驱动器，本站介绍了LM27965的封装应用图解、特点和优点、功能等，并给出了与LM27965相关的TI元器件型号供参考。

LM27965 - 具有 I2C 兼容亮度控制的双路显示白光 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM27965 is a highly integrated charge-pump-based dual-display LED driver. The device can drive up to 9 LEDs in parallel with a total output current of 180mA. Regulated internal current sinks deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group can beconfigurabled with 4 or 5 LEDs, for backlighting a larger main display and the second group can be configured with 2 or 3 LEDs, for backlighing a smaller secondary display. An additional, independently controlled led driver is provided for driving an indicator or general purpose LED. The LM27965 has an I2C compatible interface that allows the user to independently control the brightness on each bank of LEDs.

The device provides excellent efficiency without the use of an inductor by operating the charge pump in a gain of 3/2, or in Pass-Mode. The proper gain for maintaining current regulation is chosen based on LED forward voltage, so that efficiency is maximized over the input voltage range.

The LM27965 is available in a small 24-pin WQFN-24 package.

产品特性

91% Peak LED Drive Efficiency
No Inductor Required
0.3% Current Matching
Drives LEDs with up to 30mA per LED
180mA of total drive current
I2C Compatible Brightness Control Interface
Adaptive 1× - 3/2× Charge Pump
Resistor-Programmable Current Settings
External Chip RESET Pin
Extended Li-Ion Input: 2.7V to 5.5V
Small low profile industry standard leadless package, WQFN 24 : (4mm x 4mm x 0.8mm)
25mm2 total solution size
Two I2C Compatible Chip Address Options: 0x36 for LM27965SQ and 0x38 for LM27965SQ-M

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