LINEAR TECHNOLOGY DC1737A Evaluation Board, Inverting DC-DC Converter, Constant Frequency Current Mode Architecture
The demonstration board is a current mode inverting DC to DC converter featuring LTC3863 device. The LTC3863 is a robust, inverting DC to DC PMOS controller. It drives a P channel power MOSFET to generate a negative output and requires just a single inductor to complete the circuit. The board operates from an input range of 4.5V to 16V and provides a -5.2V, 1.7A output or a -12V, 1A output jumper selectable. It operates at 400KHz and may be synchronized to an external clock. A soft start feature controls output voltage slew rate at start up, reducing current surge and voltage overshoot. Burst mode operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided. The demonstration board has options for larger MOSFET and diode packages on the back of the board for higher output current requirements.
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- Output ripple of 30mVpp
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- Output regulation of ±0.1 %
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- 89.3 % efficiency
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- 0.9inch × 0.8Inch × 0.18Inch dimension
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- Low operating IQ of 70µA
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- Strong high voltage MOSFET gate driver
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- Constant frequency current mode architecture
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- Verified FMEA for adjacent pin open/short
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- Accurate current limit
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- Programmable soft start or voltage tracking