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Herein you will find informations about MC34063A DC to DC converter which is known as a monolithic control circuit. This IC is particularly designed to be incorporated in step down, step up and voltage inverting applications. And the figure below shows you a step down converter circuit diagram of this device.
If you need to design a Step-Up, Step-Down and Voltage-Inverting applications with a minimum number of external components, you may consider The MC34063A Inverting Switching Regulators Series since this device are specifically designed to be incorporated with those purposes. The circuit diagram below is one of MC34063A DC-to-DC Converter Control Circuit which perform Step–Up Converter schematic.
Within the FAN5631/5632 datasheet, there are descriptions about an efficiency optimizer feature that when enabled, it will changes the switch configuration from 2:1 to 1:1 at the lower treshold of Vin or step-down charge pump operation, pulse-skipping PFM and fractional switch operation, the shutdown, UVLO, short circuit, current limit and thermal shutdown.
LM3354 is a switched capacitor DC/DC converters that can be programmed for an output of 4.1V, which is an ideal voltage on driving white LED applications such a color LCD display in cellular phones, PDAs, and handheld computers.
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