1. Products
  2. Power Monitor, Control, and Protection
  3. Hot Swap Controllers
  4. High Voltage Hot Swap Controllers
  5. LTC4253

New Content (1)


Features and Benefits

  • Allows Safe Board Insertion and Removal from a Live -48V Backplane
  • Floating Topology Permits Very High Voltage Operation
  • Adjustable Analog Current Limit with Breaker Timer Ideal for Two Battery Feeds
  • Fast Response Time Limits Peak Fault Current
  • Adjustable Undervoltage/Overvoltage Protection with ±1% Threshold Accuracy (LTC4253A)
  • Three Sequenced Power Good Outputs
  • Adjustable Soft-Start Current Limit
  • Adjustable Timer with Drain Voltage Accelerated Response
  • Latchoff After Fault
  • Available in a 16-Pin SSOP Package

Product Details

The LTC4253/LTC4253A negative voltage Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Output current is controlled by three stages of current-limiting: a timed circuit breaker, active current limiting and a fast feedforward path that limits peak current under worst-case catastrophic fault conditions. The LTC4253/LTC4253A latch off after a circuit fault.

Adjustable undervoltage and overvoltage detectors disconnect the load whenever the input supply exceeds the desired operating range. The LTC4253/LTC4253A’s supply input is shunt-regulated, allowing safe operation with very high supply voltages. A multifunction timer delays initial startup and controls the circuit breaker’s response time. The circuit breaker’s response time can be accelerated by sensing excessive MOSFET drain voltage, keeping the MOSFET within its safe operating area (SOA). An adjustable soft-start circuit controls MOSFET inrush current at start-up.

 Three power good outputs are sequenced by an adjustable timer and two ENABLE inputs to enable external power modules at start-up or disable them if the circuit breaker trips. The LTC4253A features tight ±1% undervoltage/ overvoltage threshold accuracy. The LTC4253/LTC4253A are available in a 16-pin SSOP.

LTC4253A Recommend LTC4253B for new designs
LTC4253A-ADJ Recommend LTC4253B for new designs


  • -48V Distributed Power Systems
  •  Negative Power Supply Control
  • Central Office Switching
  • High Availability Servers
  • Disk Arrays

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Product Recommendations

LTC4253 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC4253CGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LTC4253CGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LTC4253IGN#PBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
LTC4253IGN#TRPBF Material Declaration Reliability Data 16-Lead SSOP (Narrow 0.15 Inch)
Wafer Fabrication Data R427 Reliability Data

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Buy Now Pricing

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List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

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