DC349B

LINEAR TECHNOLOGY DC349B Evaluation Board, Step Up DC-DC Converter, Delivers Up to 10A At Operation 3.3V & 5V

The demonstration circuit demonstrates a synchronous step up DC to DC converter using LTC1700EMS controller. The LTC1700EMS is a current mode no RSENSE synchronous step up controller with up to 95% efficiency. Applications include 2.5V to 3.3V or 5V converters, 2.5V to 5V converters, single cell Li Ion to 5V applications or two cell AA to 3.3V or 5V applications. The LTC1700EMS"s 550KHz operating frequency allows the use of small inductors and capacitors. The device can also be synchronized to frequencies between 400KHz to 750KHz. Burst mode operation is disabled when the device is synchronized or the SYNC/MODE pin is pulled low to reduce noise. To prevent inductor current runaway, the duty cycle is limited to 90%. Overvoltage protection turns both external MOSFETs off when the output rises about 5% above the regulated value. the DC349B demonstration board provides output voltages of 3.3V or 5V jumper selectable.

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No current sense resistor required

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OPTI-LOOP compensation minimizes COUT

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Selectable burst mode operation

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Micropower shutdown of 10µA

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Current mode operation for excellent line and load transient response

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Soft start reduces supply current transients

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1.5% output voltage accuracy

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Uses low value, small size, surface mount inductors