White LED Adaptive 1.5X/1X Switched Capacitor Current Driver

The LM27951 is a switched capacitor white-LED driver capable of driving up to 4 LEDs with 30mA through each LED Its 4 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 2.8V to 5.5V 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 750kHz switching frequency optimized for portable applications. The LM27951 consumes less than 1?A of supply current when shut down.
The LM27951 is available in a 14-pin No-Pullback Leadless Leadframe Package: LLP-14.
By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
LM27951SD Texas Instruments White LED Adaptive 1.5X/1X Switched Capacitor Current Driver 14-WSON -40 to 85
LM27951SD/NOPB Texas Instruments White LED Adaptive 1.5X/1X Switched Capacitor Current Driver 14-WSON -40 to 85
LM27951SDX/NOPB Texas Instruments White LED Adaptive 1.5X/1X Switched Capacitor Current Driver 14-WSON -40 to 85
LM27951 's PackagesLM27951 's pdf datasheet
LM27951SD LLP
LM27951SDX LLP




LM27951 Pinout, Pinouts
LM27951 pinout,Pin out
This is one package pinout of LM27951,If you need more pinouts please download LM27951's pdf datasheet.

LM27951 Application circuits
LM27951 circuits
This is one application circuit of LM27951,If you need more circuits,please download LM27951's pdf datasheet.


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