DocumentationDatasheet
Reliability Data
Product Selector Card
Press Release
cad_symbol
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.
3x3 QFN-12,MS-12
Package Variations and Pricing
| Part Number | Package | Pins | Temp | Price (1-99) |
Price (1k)* |
|---|---|---|---|---|---|
| LTC4231CMS-1#PBF | MSOP | 12 | C | $3.21 | $2.25 |
| LTC4231CMS-1#TRPBF | MSOP | 12 | C | $3.27 | $2.31 |
| LTC4231CMS-2#PBF | MSOP | 12 | C | $3.21 | $2.25 |
| LTC4231CMS-2#TRPBF | MSOP | 12 | C | $3.27 | $2.31 |
| LTC4231CUD-1#PBF | QFN | 12 | C | $3.21 | $2.25 |
| LTC4231CUD-1#TRPBF | QFN | 12 | C | $3.27 | $2.31 |
| LTC4231CUD-2#PBF | QFN | 12 | C | $3.21 | $2.25 |
| LTC4231CUD-2#TRPBF | QFN | 12 | C | $3.27 | $2.31 |
| LTC4231IMS-1#PBF | MSOP | 12 | I | $3.71 | $2.60 |
| LTC4231IMS-1#TRPBF | MSOP | 12 | I | $3.77 | $2.66 |
| LTC4231IMS-2#PBF | MSOP | 12 | I | $3.71 | $2.60 |
| LTC4231IMS-2#TRPBF | MSOP | 12 | I | $3.77 | $2.66 |
| LTC4231IUD-1#PBF | QFN | 12 | I | $3.71 | $2.60 |
| LTC4231IUD-1#TRPBF | QFN | 12 | I | $3.77 | $2.66 |
| LTC4231IUD-2#PBF | QFN | 12 | I | $3.71 | $2.60 |
| LTC4231IUD-2#TRPBF | QFN | 12 | I | $3.77 | $2.66 |
| LTC4231HMS-1#PBF | MSOP | 12 | H | $4.27 | $2.99 |
| LTC4231HUD-1#PBF | QFN | 12 | H | $4.27 | $2.99 |
| LTC4231HUD-2#PBF | QFN | 12 | H | $4.27 | $2.99 |
| LTC4231HMS-2#PBF | MSOP | 12 | H | $4.27 | $2.99 |
| LTC4231HUD-1#TRPBF | QFN | 12 | H | $4.33 | $3.05 |
| LTC4231HUD-2#TRPBF | QFN | 12 | H | $4.33 | $3.05 |
| LTC4231HMS-1#TRPBF | MSOP | 12 | H | $4.33 | $3.05 |
| LTC4231HMS-2#TRPBF | MSOP | 12 | H | $4.33 | $3.05 |
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 |