The Linear Technology LTC®3255 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
- Multimode charge pump (2:1, 1:1) with automatic mode switching maintains regulation over wide VIN range
- Mode switching maintains regulation over wide VIN range
- Input voltage shunt mode for current-fed applications
- Output current: 50 mA maximum
- Power good output
- Overtemperature and short-circuit protection
- Operating junction temperature: 150°C maximum