LTC3255 - Wide VIN Range Fault Protected 50mA Step-Down Charge Pump

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

Typical Application

LTC3255 Typical Application
LTC3255 Typical Application

Description

The LTC®3255 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

DFN-10, MS-10

LTC3255 Package Drawing
LTC3255 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3255EDD#PBF DFN 10 E $3.29 $2.30 View
LTC3255EDD#TRPBF DFN 10 E $2.36 View
LTC3255EMSE#PBF MSOP 10 E $3.29 $2.30 View
LTC3255EMSE#TRPBF MSOP 10 E $2.36 View
LTC3255HDD#PBF DFN 10 H $4.22 $2.95 View
LTC3255HDD#TRPBF DFN 10 H $3.01 View
LTC3255HMSE#PBF MSOP 10 H $4.22 $2.95 View
LTC3255HMSE#TRPBF MSOP 10 H $3.01 View
LTC3255IDD#PBF DFN 10 I $3.71 $2.60 View
LTC3255IDD#TRPBF DFN 10 I $2.66 View
LTC3255IMSE#PBF MSOP 10 I $3.71 $2.60 View
LTC3255IMSE#TRPBF MSOP 10 I $2.66 View
LTC3255MPDD#PBF DFN 10 MP $10.00 $7.00 View
LTC3255MPDD#TRPBF DFN 10 MP $7.06 View
LTC3255MPMSE#PBF MSOP 10 MP $10.00 $7.00 View
LTC3255MPMSE#TRPBF MSOP 10 MP $7.06 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2041A LTC3255EMSE Demo Board | -52V/60V Fault-Protected Step-Down Charge Pump, 4V ≤ VIN ≤ 48V, Vout = 2.5V/3.3V/5V/12V/Adj @ 50mA. Contact Factory
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspiceIV

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Models for the following parts are available in LTspice IV:
LTC3255

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