LTC4231 - Micropower Hot Swap Controller

The LTC®4231 is a micropower Hot Swap™ controller that allows safe circuit board insertion and removal from a live power supply. An internal high side switch driver controls the gate of an external N-channel MOSFET. Back-to-back MOSFETs can be used for reverse supply protection down to –40V.

The LTC4231 provides a debounce delay and allows the GATE to be ramped up at an adjustable rate. After startup, the LTC4231's quiescent current drops to 4μA during normal operation with output active. UVL, UVH, OV and GNDSW monitor overvoltage and undervoltage periodically, keeping total quiescent current low. Pulling SHDN# low shuts down the LTC4231 and quiescent current drops to 0.3μA.

During an overcurrent fault, the LTC4231 actively limits current while running an adjustable timer. The LTC4231-1 remains off after a current fault while the LTC4231-2 automatically reapplies power after a cool-down period.

Features
  • Enables Safe Board Insertion and Removal from a Power Supply
  • 4μA Supply Current
  • 0.3μA Shutdown Current
  • Wide Operating Voltage Range: 2.7V to 36V
  • Reverse Supply Protection to –40V
  • Adjustable Analog Current Limit with Circuit Breaker
  • Automatic Retry or Latchoff on Current Fault
  • Overvoltage and Undervoltage Monitoring
  • Controls Single or Back-to-Back N-Channel MOSFETs
  • 12-Lead MSOP and 3mm × 3mm QFN Packages
Typical Application
LTC4231 Typical Application
LTC4231 Typical Application
Applications
  • Battery Powered Equipment
  • Solar Powered Systems
  • Portable Instruments
  • Automotive Battery Protection
  • Energy Harvesting
Packaging
LTC4231 Package Drawing
LTC4231 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4231CMS-1#PBFMS-12C$3.21$2.25
LTC4231CMS-1#TRPBFMS-12C$3.27$2.31
LTC4231CMS-2#PBFMS-12C$3.21$2.25
LTC4231CMS-2#TRPBFMS-12C$3.27$2.31
LTC4231CUD-1#PBF3x3 QFN-12C$3.21$2.25
LTC4231CUD-1#TRPBF3x3 QFN-12C$3.27$2.31
LTC4231CUD-2#PBF3x3 QFN-12C$3.21$2.25
LTC4231CUD-2#TRPBF3x3 QFN-12C$3.27$2.31
LTC4231HMS-1#PBFMS-12H$4.27$2.99
LTC4231HMS-1#TRPBFMS-12H$4.33$3.05
LTC4231HMS-2#PBFMS-12H$4.27$2.99
LTC4231HMS-2#TRPBFMS-12H$4.33$3.05
LTC4231HUD-1#PBF3x3 QFN-12H$4.27$2.99
LTC4231HUD-1#TRPBF3x3 QFN-12H$4.33$3.05
LTC4231HUD-2#PBF3x3 QFN-12H$4.27$2.99
LTC4231HUD-2#TRPBF3x3 QFN-12H$4.33$3.05
LTC4231IMS-1#PBFMS-12I$3.71$2.60
LTC4231IMS-1#TRPBFMS-12I$3.77$2.66
LTC4231IMS-2#PBFMS-12I$3.71$2.60
LTC4231IMS-2#TRPBFMS-12I$3.77$2.66
LTC4231IUD-1#PBF3x3 QFN-12I$3.71$2.60
LTC4231IUD-1#TRPBF3x3 QFN-12I$3.77$2.66
LTC4231IUD-2#PBF3x3 QFN-12I$3.71$2.60
LTC4231IUD-2#TRPBF3x3 QFN-12I$3.77$2.66
Demo Boards
Part NumberDescriptionPrice
DC2161A-ALTC4231IMS-1 Demo Board | Micropower Hot Swap Controller with Latch-Off$75.00
DC2161A-BLTC4231IMS-2 Demo Board | Micropower Hot Swap Controller with Auto-Retry$75.00
Datasheet
Reliability Data
Product Selector Card
Press Release
CAD Symbol
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