Semi inductor switched capacitor white LED driver with a variety of regulated output

National Semiconductor Corporation Ns (National Semiconductor Corporation, referred to as the country's half) the day before announcing the launch of a fixed frequency 4.5V and provides a regulated output of 5.0V switched capacitor charge pump LM2751. The chip can provide up to 150mA of output current between 2.8V and 5.5V, and only need to add 4 low-cost ceramic capacitors to provide support, without the need to add inductors. LM2751 chip is suitable for white light-emitting diode display and keyboard backlight system, as well as a variety of different applications such as universal boost / buck / boost regulators.

The LM2751 chip can be used to stabilize the fixed frequency to ensure that the input current mixed with the system noise can be reduced to a minimum, and the switching frequency can be predicted. Customers can choose to set the following switching frequency: 725kHz, 300kHz, 37kHz or 9.5kHz. The chip regulator output error will not exceed 3%, the peak efficiency of more than 90%, the shutdown current is not more than 1 A (typical)

Half of the LM2751 chip using 10 pin LLP no pull package, the size of only 3 x 3 x 0.8mm, a large number of spot supply. The chip also has no lead package available. LM2751 chip to 1000 for the procurement unit, a single price of $1.10 (for reference only).