National Semiconductor Corporation (National Semiconductor) announced a fixed-frequency switched capacitor charge pump that delivers regulated 4.5-V and 5.0-V outputs. 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. LM2751 chip features: 1. There are two regulator output options: 4.5 volts and 5.0 volts 2. Regulated output of the high accuracy, the error will not exceed ± 3% 3. The peak efficiency of 90% or more 4 . Output Current: 150mA at 4.5V or 80mA at 5.0V 5. Input Voltage Range: 2.8V to 5.5V 6. Lower Input and Output Voltage Ripple 7. Shutdown Current Does Not Over 1mA (Typical) 8. Compact solution - because no additional inductor is required 9. The following switching frequencies are selectable: 725kHz, 300kHz, 37kHz or 9.5kHz 10. Package, Price and Availability National Semiconductor's The LM2751 is available in a 10-pin LLP pull-back package, measuring only 3mm x 3mm x 0.8mm and available in large quantities. This chip also has a lead-free package to choose from. LM2751 chip to 1,000 units for the procurement unit, the single price of 1.10 US dollars.
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