Description

The LTC1871 is a wide input range, current mode, boost, flyback or SEPIC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to medium power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET?s on-resistance, thereby maximizing efficiency.The IC?s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10?A make the LTC1871 ideally suited for battery-operated systems.For applications requiring constant frequency operation, Burst Mode operation can be defeated using the MODE/ SYNC pin. Higher output voltage boost, SEPIC and flyback applications are possible with the LTC1871 by connecting the SENSE pin to a resistor in the source of the power MOSFET.The LTC1871 is available in the 10-lead MSOP package. Vin Range INTVcc Features LTC1871 2.5V to 36V 5.2V - LTC1871-1 2.5V to 36V 5.2V Lower Burst Mode Threshold (0.195V vs. 0.3V) LTC1871-7 6V to 36V 7V Drives 6V Gate N-Channel MOSFETs LTC1871X 2.5V to 36V 5.2V 175?C Junction Temp, 100% Tested at 175?C Applications Telecom Power Supplies Portable Electronic Equipment

Type:

Part number: DC414B

More details from Analog Devices Inc.