DC1802A

LTC3245EMSE Charge Pump 3.168VDC to 3.432VDC/4.8VDC to 5.2VDC Output Demonstration Circuit

The demonstration circuit is a wide VIN range, low noise, 250mA buck boost charge pump featuring LTC3245EMSE device. The LTC3245EMSE is a switched capacitor buck boost DC to DC converter that produces a regulated output 3.3V, 5V or adjustable from a 2.7V to 38V input. The device uses switched capacitor fractional conversion to maintain regulation over a wide range of input voltage. Internal circuitry automatically selects the conversion ratio to optimize efficiency as input voltage and load conditions vary. No inductors are required. The unique constant frequency architecture provides a lower noise output than conventional charge pump regulators. To optimize efficiency at the expense of slightly higher output ripple, the device has pin selectable burst mode operation.

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Output voltage VOUT1 from 4.80V to 5.20V

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Output voltage VOUT2 from 3.168V to 3.432V

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Low noise, constant frequency operation

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Pin selectable burst mode operation

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Overtemperature and short circuit protection