Charge Pump LED Controller With I2C Compatible Interface In Micro SMD

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 I 2C 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 3A (typ.) of supply current in shut-down.
The LM2755 is available in Nationals tiny 18-bump thin micro SMD package.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM2755TM/NOPB Texas Instruments Charge Pump LED Controller with I2C Compatible Interface in Micro SMD 18-DSBGA -30 to 85
LM2755TMX/NOPB Texas Instruments Charge Pump LED Controller with I2C Compatible Interface in Micro SMD 18-DSBGA -30 to 85
LM2755 's PackagesLM2755 's pdf datasheet

LM2755 Pinout, Pinouts
LM2755 pinout,Pin out
This is one package pinout of LM2755,If you need more pinouts please download LM2755's pdf datasheet.

LM2755 Application circuits
LM2755 circuits
This is one application circuit of LM2755,If you need more circuits,please download LM2755's pdf datasheet.

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