LTC3255IMSE 10-Lead MSOP Fault Protected Step-Down Charge Pump 48V 50mA Integrated Circuit Chip

The LTC3255IMSE is a switched capacitor step-down DC/DC converter that produces an adjustable 2.4 V to 12.5 V output from a 4 V to 48 V input. Where the input is more than twice the output, the 2:1 capacitive conversion extends the available output current beyond the input supply current limit, so a 48 V rail can feed a low voltage load without an inductor.

The charge pump switches automatically between 2:1 and 1:1 modes as the input voltage and load change, which keeps the output in regulation and efficiency high across the wide input range. No inductor is needed, so the solution has no switching node to radiate and no magnetic component to place.

An integrated shunt regulator on the input makes the part well suited to 4 mA to 20 mA current loop transmitters, where the loop current limits the available power. With 2:1 conversion a 4 mA loop current can supply a 7.4 mA load continuously, which is enough for a sensor and its signal conditioning.

Input fault protection from -52 V to 60 V means a miswired loop, a reversed connection or a transient does not destroy the device. Burst Mode operation drops the no-load input current to 16 microamps, and the thermally enhanced package keeps the die within rating at full load.

The LTC3255IMSE is the I grade part in the 10-Lead Plastic MSOP package, specified from -40 to 125 degrees C. It is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.

• Wide 4 V to 48 V input range
• Adjustable 2.4 V to 12.5 V output
• 50 mA maximum output current
• 2:1 and 1:1 multimode charge pump
• Automatic mode switching
• Input fault protection from -52 V to 60 V
• 16 microamp no-load quiescent current
• No inductor required
• Suits 4 mA to 20 mA current loops
• Current multiplication in 2:1 mode
• Thermally enhanced package
• 10-Lead Plastic MSOP package
• RoHS compliant, lead free

• 4 mA to 20 mA current loops
• Industrial sensor transmitters
• Wide VIN step-down rails
• Telecom and networking cards
• Automotive housekeeping supplies
• Process control instruments

Typical use is a 4 mA to 20 mA transmitter that must power its sensor and signal chain from the loop current alone.

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