LTC1642 - Hot Swap Controller

The LTC1642 is a 16-pin Hot Swap controller that allows a board to be safely inserted and removed from a live backplane. Using an external N-Channel pass transistor, the board supply voltage can be ramped up at an adjustable rate. A high side switch driver controls the N-Channel gate for supply voltages above 2.97V.

The SENSE pin allows foldback limiting of the load current, with circuit breaker action after an adjustable delay time. The delay allows the part to power-up in current limit. The CRWBR output can be used to trigger an SCR for crowbar protection of the load if the input supply exceeds an adjustable threshold. The RESET output can generate a system reset with adjustable delay when the supply voltage falls below an adjustable threshold. The ON pin cycles the board power. The LTC1642 is available in the 16-pin SSOP package.

Features
  • Adjustable Undervoltage and Overvoltage Protection
  • Foldback Current Limit
  • Adjustable Current Limit Time-Out
  • Protected Against Surges to 33V
  • Single Channel NFET Driver
  • Latch Off or Automatic Retry on Current Fault
  • Driver for SCR Crowbar on Overvoltage
  • Adjustable Reset Timer
  • Reference Output with Uncommitted Comparator
  • 16-Pin SSOP Package
Typical Application
Applications
  • Hot Board Insertion
  • Electronic Circuit Breaker
  • InfiniBandTM Systems
Packaging
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC1642CGN#PBFSSOP-16C$4.15$3.50
LTC1642CGN#TRPBFSSOP-16C$3.56
LTC1642IGN#PBFSSOP-16I$5.00$4.20
LTC1642IGN#TRPBFSSOP-16I$4.26
Datasheet
Spec Notice
Design Note
Reliability Data
Product Selector Card
LT Journal
Related Product
LTC1642 - Hot Swap Controller
LTC1642 - SPECIFICATION NOTICE
DN265 - Hot Swap Circuit Meets InfiniBand Specification
R318 Reliability Data
Hot Swap Controllers
May 2001 Hot Swap Circuit Gets InfiniBand Power onto your Module
Nov 1999 LTC1642: a Hot Swap Controller with Foldback Current Limiting and Overvoltage Protection
LTC1642 Footprints and Symbols