LTC®3255 Step-Down Charge Pump

By Analog Devices Inc 86

LTC®3255 Step-Down Charge Pump

The Linear Technology LTC3255 is a switched-capacitor step-down DC/DC converter that produces a regulated output (2.4 V to 12.5 V adjustable) from a 4 V to 48 V input. In applications where the input voltage exceeds twice the output voltage, 2:1 capacitive charge pumping extends output current capability beyond input supply current limits. At no load, Burst Mode® operation cuts VIN quiescent current to 16 μA.

With its integrated VIN shunt regulator, the LTC3255 excels in 4 mA to 20 mA current-loop applications. The device enables current multiplication; a 4 mA input current can power a 7.4 mA load continuously. Alternatively, the LTC3255 serves as a higher-efficiency replacement for linear regulators and provides a space-saving inductor-free alternative to buck DC/DC converters.

The LTC3255 withstands reverse-polarity input supplies and output short-circuits without damage. Safety features including current limit and overtemperature protection further enhance robustness. The LTC3255 is available in thermally enhanced 10-lead MSOP and low-profile 3 mm × 3 mm 10-lead DFN packages.

  • Input voltage range: 4 V to 48 V
  • Adjustable regulated output: 2.4 V to 12.5 V
  • Thermally enhanced 10-lead MSOP and 10-lead (3 mm × 3 mm) DFN packages
  • 16 µA quiescent current in regulation at no load
  • Input fault protection from -52 V to 60 V
  • Mode switching maintains regulation over wide VIN range
  • Input voltage shunt mode for current-fed applications
  • Multimode charge pump (2:1, 1:1) with automatic mode switching maintains regulation over wide VIN range
  • Output current: 50 mA maximum
  • Power good output
  • Overtemperature and short-circuit protection
  • Operating junction temperature: 150°C maximum

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