LM2756 - 具有 32 指数明暗调节步进（采用微型 SMD 封装）的多显示无电感器 LED 驱动器

LM2756是TI德州仪器公司的一款背光产品，LM2756是具有 32 指数明暗调节步进（采用微型 SMD 封装）的多显示无电感器 LED 驱动器，本站介绍了LM2756的封装应用图解、特点和优点、功能等，并给出了与LM2756相关的TI元器件型号供参考。

LM2756 - 具有 32 指数明暗调节步进（采用微型 SMD 封装）的多显示无电感器 LED 驱动器 - 背光 - LED驱动器 - 德州仪器

产品描述

The LM2756 is a highly integrated, switched-capacitor, multi-display LED driver that can drive up to 8 LEDs in parallel with a total output current of 180mA. Regulated internal current sources deliver excellent current and brightness matching in all LEDs.

The LED driver current sinks are split into three independently controlled groups. The primary group (Group A) can be configured to drive four, five or six LEDs for use in the main phone display, while the secondary group (Group B) can be configured to drive one, two or three LEDs for driving secondary displays, keypads and/or indicator LEDs. An additional driver, D1C, is provided for additional indicator lighting functions.

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 LM2756 is available in TI's tiny 20-bump, 0.4mm pitch, thin DSBGA package.

产品特性

Drives up to 8 LEDs with up to 30mA of Diode Current Each
32 Exponential Dimming Steps with 800:1 Dimming Ratio for Group A (Up to 6 LEDs)
8 Linear Dimming States for Groups B (Up to 3 LEDs) and D1C (1 LED)
Programmable Auto-Dimming Function
3 Independently Controlled LED Groups Via I2C Compatible Interface
Up to 90% Efficiency
Total Solution Size < 21mm2
Low Profile 20 Bump DSBGA Package (1.615mm × 2.015mm × 0.6mm)
0.4% Accurate Current Matching
Internal Soft-Start Limits Inrush Current
True Shutdown Isolation for LED’s
Wide Input Voltage Range (2.7V to 5.5V)
Active High Hardware Enable

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