DC1523A

High Efficiency Synchronous 4-Switch Step-Up/Step-Down DC-DC Converter Demonstration Circuit

The demonstration board features LTC3789EGN high efficiency switching step up/down controller. The LTC3789EGN is a high performance switching regulator controller designed to regulate the output using input voltages above, below or equal to the output voltage. Synchronous operation provides very high efficiency, up to 97%. Constant frequency current mode architecture allows phase lockable frequency from 200KHz to 600KHz. An accurate output current limit provides support for battery charging. A wide input and output range with smooth transfer function through all operating modes makes the product ideal for automotive, telecom and battery systems. The DC1523A demonstration board input range is from 5V to 36V. The output voltage is 12V. The board is capable of delivering up to 5A of output current over the input voltage range.

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Default operating frequency of 400KHz

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88% to 97% efficiency

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Programmable input or output current

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Current mode control

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No reverse current during start up

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Power good output voltage monitor

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Quad N channel MOSFET synchronous drive

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True soft start and VOUT short protection, even in boost mode

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VOUT disconnected from VIN during shutdown