LTC1871IMS#PBF

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 10μA make the device ideally suited for battery-operated systems. Higher output voltage boost, SEPIC and flyback applications are possible with the device by connecting the SENSE pin to a resistor in the source of the power MOSFET. It is used in application such as telecom power supplies, portable electronic equipment etc.

• Wide input voltage range is 2.5V to 36V
• Current mode control provides excellent transient response
• High maximum duty cycle is 92% typical
• Synchronizable to an external clock upto 1.3 × fOSC
• User-controlled pulse skip or Burst Mode® operation
• Output overvoltage protection
• Capable of operating with a sense resistor for high output voltage applications
• INTVCC regulator output voltage is 5.2V typical
• Operating temperature is -40°C to 125°C
• Package style is 10-lead plastic MSOP

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