27 February - 1 March 2018 // Nuremberg, Germany

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Zoom product LOGO_LT8640 - Silent Switcher

LT8640 - Silent Switcher

LOGO_LT8640 - Silent Switcher

LT8640 - Silent Switcher

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The LT8640 step-down regulator features Silent Switcher architecture designed to minimize EMI/EMC emissions while delivering high efficiency at frequencies up to 3MHz. Assembled in a 3mm × 4mm QFN, the monolithic construction with integrated power switches and inclusion of all necessary circuitry yields a solution with a minimal PCB footprint. An ultralow 2.5μA quiescent current—with the output in full regulation—enables applications requiring highest efficiency at very small load currents. Transient response remains excellent and output voltage ripple is below 10mVP-P at any load, from zero to full current.

The LT8640 allows high VIN to low VOUT conversion at high frequency with a fast minimum top switch on-time of 40ns. Operation is safe in overload even with a saturated inductor.

Essential features are included and easy to use: An open-drain PG pin signals when the output is in regulation. The SYNC/MODE pin selects between Burst Mode, pulse-skipping, or spread spectrum mode, and also allows synchronization to an external clock. Soft-start and tracking functionality is accessed via the TR/SS pin. An accurate enable threshold can be set using the EN/UV pin and a resistor at the RT pin programs switch frequency.

Applications:

  • Automotive and Industrial Supplies
  • General Purpose Step-Down
  • GSM Power Supplies

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LT8640 - Silent Switcher is assigned to following product groups:

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