LTC1871EMS-1#PBF

LTC1871-1 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. It eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, there by maximizing efficiency. Higher output voltage applications are possible with the device by connecting the SENSE pin to a resistor in the source of the power MOSFET. 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. This device differs from the LTC1871 by having a lower pulse skip threshold, making it ideal for applications requiring constant frequency operation at light loads. The lower pulse skip threshold also helps maintain constant frequency operation in applications with a wide input voltage range. It is used in application such as telecom power supplies, portable electronic equipment etc.

• High efficiency (no sense resistor required), output overvoltage protection
• Wide input voltage range is 2.5V to 36V
• Current mode control provides excellent transient response
• Maximum duty cycle is 92% typical, regulator output voltage is 5.2V
• Internal voltage reference is ±1%
• Micropower shutdown is 10μA typical
• Synchronizable to an external clock upto 1.3 × fOSC
• User-controlled pulse skip or Burst Mode® operation
• Capable of operating with a sense resistor for high output voltage applications
• Operating junction temperature is -40°C to 85°C, package style is 10-lead plastic MSOP

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party