LTC3255IMSE#PBF

The LTC3255 is a switched-capacitor step-down DC/DC converter that produces a regulated output (2.4V to 12.5V adjustable) from a 4V to 48V 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 16μA. With its integrated VIN shunt regulator, the LTC3255 excels in 4mA to 20mA current loop applications. The device enables current multiplication; a 4mA input current can power a 7.4mA load continuously. Alternatively, the LTC3255 serves as a higher efficiency replacement for linear regulators and provides a space-saving inductorfree 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 3mm × 3mm 10-lead DFN packages.

Applications

• Industrial Control, Factory Automation, Sensors, and SCADA Systems
• Housekeeping Power Supplies
• Current-Boosting Voltage Regulators for 4mA to 20mA Current Loops

Key features

• Input Voltage Range: 4V to 48V
• Adjustable Regulated Output: 2.4V to 12.5V
• Output Current: 50mA Maximum
• 16μA Quiescent Current in Regulation at No Load
• Input Fault Protection from –52V to 60V
• Multimode Charge Pump (2:1, 1:1) with Automatic Mode Switching Maintains Regulation Over Wide VIN Range
• Input Voltage Shunt Mode for Current-Fed Applications
• Power Good Output
• Overtemperature and Short-Circuit Protection
• Operating Junction Temperature: 150°C Maximum
• Thermally Enhanced 10-Lead MSOP and 10-Lead (3mm×3mm) DFN packages