LM2755 - 具有 I2C 兼容接口（采用微型 SMD 封装）的充电泵 LED 控制器

LM2755是TI德州仪器公司的一款指示灯/RGBW产品，LM2755是具有 I2C 兼容接口（采用微型 SMD 封装）的充电泵 LED 控制器，本站介绍了LM2755的封装应用图解、特点和优点、功能等，并给出了与LM2755相关的TI元器件型号供参考。

LM2755 - 具有 I2C 兼容接口（采用微型 SMD 封装）的充电泵 LED 控制器 - 指示灯/RGBW - LED驱动器 - 德州仪器

产品描述

The LM2755 is a charge-pump-based, constant current LED driver capable of driving 3 LEDs with a total output current up to 90mA. The diode current waveforms of each LED can be trapezoidal with timing and level parameters (rise time, fall time, high level, low level, delay, high time, low time) programmed via an I2C-compatible interface. The 32 brightness levels found on the LM2755 are exponentially spaced (as opposed to linearly spaced) to better match the response of the human eye to changing brightness levels.

The device requires only four small and low-cost ceramic capacitors. The LM2755 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 pre-regulation scheme used by the LM2755 is optimized to ensure low conducted noise on the input. An internal soft-start circuitry eliminates high inrush current at start-up. The LM2755 consumes 3µA (typ.) of supply current in shut-down.

The LM2755 is available in Texas Instruments' tiny 18-bump thin DSBGA package.

产品特性

90% Peak Efficiency
Total solution size < 13mm2
No Inductor Required: Only 4 Inexpensive Ceramic Caps
3 Independently Controlled Constant Current Outputs
Programmable Trapezoidal Dimming Waveform on Each Output
Programmable Timing Control Via Internal Registers and External Clock Synchronization Input
32 Exponential Dimming Steps with 800:1 Dimming Ratio
Programmable Brightness Control via I2C-Compatible Interface
Hardware Enable Pin
Wide Input Voltage Range: 2.7V to 5.5V
Tiny 18-bump Thin DSBGA : 1.8mm x 1.6mm x 0.6mm

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