LTC4231 - Micropower Hot Swap Controller
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
Description
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.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LTC4231CMS-1#PBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4231CMS-1#TRPBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4231CMS-2#PBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4231CMS-2#TRPBF | MS-12 | MS | C | 05-08-1668 | Yes |
| LTC4231CUD-1#PBF | 3x3 QFN-12 | UD | C | 05-08-1855 | Yes |
| LTC4231CUD-1#TRPBF | 3x3 QFN-12 | UD | C | 05-08-1855 | Yes |
| LTC4231CUD-2#PBF | 3x3 QFN-12 | UD | C | 05-08-1855 | Yes |
| LTC4231CUD-2#TRPBF | 3x3 QFN-12 | UD | C | 05-08-1855 | Yes |
| LTC4231HMS-1#PBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4231HMS-1#TRPBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4231HMS-2#PBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4231HMS-2#TRPBF | MS-12 | MS | H | 05-08-1668 | Yes |
| LTC4231HUD-1#PBF | 3x3 QFN-12 | UD | H | 05-08-1855 | Yes |
| LTC4231HUD-1#TRPBF | 3x3 QFN-12 | UD | H | 05-08-1855 | Yes |
| LTC4231HUD-2#PBF | 3x3 QFN-12 | UD | H | 05-08-1855 | Yes |
| LTC4231HUD-2#TRPBF | 3x3 QFN-12 | UD | H | 05-08-1855 | Yes |
| LTC4231IMS-1#PBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LTC4231IMS-1#TRPBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LTC4231IMS-2#PBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LTC4231IMS-2#TRPBF | MS-12 | MS | I | 05-08-1668 | Yes |
| LTC4231IUD-1#PBF | 3x3 QFN-12 | UD | I | 05-08-1855 | Yes |
| LTC4231IUD-1#TRPBF | 3x3 QFN-12 | UD | I | 05-08-1855 | Yes |
| LTC4231IUD-2#PBF | 3x3 QFN-12 | UD | I | 05-08-1855 | Yes |
| LTC4231IUD-2#TRPBF | 3x3 QFN-12 | UD | I | 05-08-1855 | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
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 |
|---|---|---|---|
| DC2161A-A | LTC4231IMS-1 Demo Board | Micropower Hot Swap Controller with Latch-Off | $75.00 | |
| DC2161A-B | LTC4231IMS-2 Demo Board | Micropower Hot Swap Controller with Auto-Retry | $75.00 | |
| Buy Now | |||
Applications
- Battery Powered Equipment
- Solar Powered Systems
- Portable Instruments
- Automotive Battery Protection
- Energy Harvesting
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LTC4231-1
LTC4231-2
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
