LTC1775IGN#PBF

LTC1775 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 the need for a sense resistor and improves efficiency. Burst Mode™ operation at low load currents reduces switching losses and low dropout operation extends operating time in battery-powered systems. A forced continuous mode control pin can assist secondary winding regulation by disabling Burst Mode operation when the main output is lightly loaded. Fault protection is provided by foldback current limiting and an output overvoltage comparator. An external capacitor attached to the RUN/SS pin provides soft start capability for supply sequencing. It is used in application such as notebook computers, automotive electronics, battery chargers, distributed power systems etc.

• Highest efficiency current mode controller
• Maximum current sense threshold is 300mV typical
• Stable high current operation, shutdown current is 30µA maximum
• Dual N-channel MOSFET synchronous drive
• Input voltage range is 4V to 36V
• Output voltage range is 1.19V to VIN
• ±1% 1.19V reference, very low drop out operation is 99% duty cycle
• Forced continuous mode control pin, optional programmable soft start
• Pin selectable output voltage, foldback current limit
• Operating temperature is -40°C to 85°C, package style is 16-lead narrow plastic SSOP

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