Low Power Regulator Reference

This is a simple circuit of low power regulator reference. This circuit can produces stable voltage reference. The voltage reference that is produced by this circuitĀ  almost free of supply voltage hash. This circuit has typical power supply rejection go over 100dB. Here is the circuit : [Source: National Semiconductor Application Note]

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Automatic Switching for Battery – USB Power Connection

This is a simple circuit for automatic switchover between battery and USB port. This circuit uses more general step-up converter architecture. Compared with an analog switch or diode-OR circuitry , this circuit is simpler. Here is the circuit : This circuit uses the MAX1795/MAX1796/MAX1797 step-up converter. To connect the output of a step-up converter and the USB power line, a […]

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