National Semiconductor Corp. announced the availability of a fixed frequency switched capacitor charge pump that delivers 4.5V and 5.0V regulated output. The LM2751 provides up to 150mA of output current over an input voltage range of 2.8V to 5.5V with only a minimum of four low-cost ceramic capacitors, eliminating the need for inductors Device. The LM2751 is suitable for a wide range of applications including white LED displays and keypad backlighting systems, as well as general-purpose boost or buck / boost regulators. The LM2751 chip can be pre-regulated with a fixed frequency to ensure that noise that mixes with the input current into the system is minimized and the switching frequency is predictable. Customers can choose to set the following switching frequency: 725kHz, 300kHz, 37kHz or 9.5kHz. Features of the LM2751 chip are available in two regulated outputs: 4.5V and 5.0V Regulated Outputs Accurately Accurate with ± 3% Error Peak Efficiency up to 90% Output Current: 150mA at 4.5V voltage operation) or 80mA (operating at 5.0 volts) input voltage range: 5.5 volts to 2.8 volts low input and output voltage ripple stop the motor current does not exceed 1mA (typ) compact solution - because without adding Set the inductor to choose from the following switching frequencies: 725kHz, 300kHz, 37kHz or 9.5kHz 10-pin LLP No Post-Bring Package: 3mm x 3mm x 0.8mm.
