LINEAR TECHNOLOGY DC337A Evaluation Board, Step Down DC-DC Regulator, High Power, Delivers 10A At Operation 3.3V & 5V
The demonstration board is a constant frequency step down regulator for high power applications using LTC1775CS device. The LTC1775CS is a synchronous step down switching regulator controller that drives external N channel power MOSFETs using few external components. Current mode control with MOSFET VDS sensing eliminates need for a sense resistor and improves efficiency . Burst mode operation reduces switching losses and low dropout operation extends operating time in battery powered systems. The LTC1775CS uses a current mode, constant frequency architecture to switch a pair of N channel power MOSFETs. Current mode control is provided without using a sense resistor by monitoring voltage drop across the MOSFET switches in order to determine inductor current. The regulator delivers up to 10A at fixed output voltages of 3.3V and 5V. The output voltage can also be adjusted with an external feedback divider from 1.19V up to 12V. Input voltages can range from 4.5V up to 28V.
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- Switching frequency of 150KHz
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- Highest efficiency current mode controller
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- No sense resistor required
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- Stable high current operation
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- 300mV maximum current sense voltage
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- Dual N channel MOSFET synchronous drive
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- ±1% 1.19V reference
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- Programmable fixed frequency with injection lock
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- Very low drop out operation, 99% duty cycle
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- Forced continuous mode control pin