LTC4368 - 100V UV/OV and Reverse Protection Controller with Bidirectional Circuit Breaker


  • Wide Operating Voltage Range: 2.5V to 60V
  • Overvoltage Protection to 100V
  • Reverse Supply Protection to –40V
  • Bidirectional Electronic Circuit Breaker:
    +50mV Forward Sense Threshold
    –50mV Reverse (LTC4368-1)
    –3mV Reverse (LTC4368-2)
  • Adjustable ±1.5% Undervoltage and Overvoltage Thresholds
  • Low Operating Current: 80μA
  • Low Shutdown Current: 5μA
  • Controls Back-to-Back N-Channel MOSFETs
  • Blocks 50Hz and 60Hz AC Power
  • Hot Swappable Supply Input
  • Pin-Selectable Overcurrent Auto-Retry Timer or Latchoff
  • 10-Pin MSOP and 3mm × 3mm DFN Packages

Typical Application

LTC4368 Typical Application
LTC4368 Typical Application


The LTC®4368 protects applications from power supply voltages that may be too high, too low, or even negative and from overcurrent faults in both forward and reverse directions. The LTC4368 controls the gate voltage of a pair of external N-channel MOSFETs to ensure that the load is connected to the input supply only when there are no voltage or current faults.

Two comparator inputs allow configuration of the overvoltage (OV) and undervoltage (UV) set points using an external resistive divider. A current sense resistor sets the forward and reverse circuit breaker current thresholds. After a forward current fault, the LTC4368 will either latch off power, or retry after a user adjustable delay. After a reverse current fault, the LTC4368 waits for the output to fall 100mV below the input to reconnect power to the load.

The LTC4368 has a 32ms turn-on delay that debounces live supply input connections and blocks 50Hz and 60Hz AC power. UV/OV faults also trigger the 32ms recovery delay before the external MOSFETs are turned back on.


For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4368CDD-1#PBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4368CDD-1#TRPBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4368CDD-2#PBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4368CDD-2#TRPBF 3x3 DFN-10 DD C 05-08-1699 Yes
LTC4368CMS-1#PBF MS-10 MS C 05-08-1661 Yes
LTC4368CMS-1#TRPBF MS-10 MS C 05-08-1661 Yes
LTC4368CMS-2#PBF MS-10 MS C 05-08-1661 Yes
LTC4368CMS-2#TRPBF MS-10 MS C 05-08-1661 Yes
LTC4368HDD-1#PBF 3x3 DFN-10 DD H 05-08-1699 Yes
LTC4368HDD-1#TRPBF 3x3 DFN-10 DD H 05-08-1699 Yes
LTC4368HDD-2#PBF 3x3 DFN-10 DD H 05-08-1699 Yes
LTC4368HDD-2#TRPBF 3x3 DFN-10 DD H 05-08-1699 Yes
LTC4368HMS-1#PBF MS-10 MS H 05-08-1661 Yes
LTC4368HMS-1#TRPBF MS-10 MS H 05-08-1661 Yes
LTC4368HMS-2#PBF MS-10 MS H 05-08-1661 Yes
LTC4368HMS-2#TRPBF MS-10 MS H 05-08-1661 Yes
LTC4368IDD-1#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4368IDD-1#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4368IDD-2#PBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4368IDD-2#TRPBF 3x3 DFN-10 DD I 05-08-1699 Yes
LTC4368IMS-1#PBF MS-10 MS I 05-08-1661 Yes
LTC4368IMS-1#TRPBF MS-10 MS I 05-08-1661 Yes
LTC4368IMS-2#PBF MS-10 MS I 05-08-1661 Yes
LTC4368IMS-2#TRPBF MS-10 MS I 05-08-1661 Yes

LTC4368 Package Drawing
LTC4368 Package Drawing

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

Part Number Package Temp Price
LTC4368CDD-1#PBF 3x3 DFN-10 C $2.84 $1.99 Yes
LTC4368CDD-1#TRPBF 3x3 DFN-10 C $2.90 $2.05 Yes
LTC4368CDD-2#PBF 3x3 DFN-10 C $2.84 $1.99 Yes
LTC4368CDD-2#TRPBF 3x3 DFN-10 C $2.90 $2.05 Yes
LTC4368CMS-1#PBF MS-10 C $2.84 $1.99 Yes
LTC4368CMS-1#TRPBF MS-10 C $2.90 $2.05 Yes
LTC4368CMS-2#PBF MS-10 C $2.84 $1.99 Yes
LTC4368CMS-2#TRPBF MS-10 C $2.90 $2.05 Yes
LTC4368HDD-1#PBF 3x3 DFN-10 H $3.60 $2.52 Yes
LTC4368HDD-1#TRPBF 3x3 DFN-10 H $3.66 $2.58 Yes
LTC4368HDD-2#PBF 3x3 DFN-10 H $3.60 $2.52 Yes
LTC4368HDD-2#TRPBF 3x3 DFN-10 H $3.66 $2.58 Yes
LTC4368HMS-1#PBF MS-10 H $3.60 $2.52 Yes
LTC4368HMS-1#TRPBF MS-10 H $3.66 $2.58 Yes
LTC4368HMS-2#PBF MS-10 H $3.60 $2.52 Yes
LTC4368HMS-2#TRPBF MS-10 H $3.66 $2.58 Yes
LTC4368IDD-1#PBF 3x3 DFN-10 I $3.13 $2.19 Yes
LTC4368IDD-1#TRPBF 3x3 DFN-10 I $3.19 $2.25 Yes
LTC4368IDD-2#PBF 3x3 DFN-10 I $3.13 $2.19 Yes
LTC4368IDD-2#TRPBF 3x3 DFN-10 I $3.19 $2.25 Yes
LTC4368IMS-1#PBF MS-10 I $3.13 $2.19 Yes
LTC4368IMS-1#TRPBF MS-10 I $3.19 $2.25 Yes
LTC4368IMS-2#PBF MS-10 I $3.13 $2.19 Yes
LTC4368IMS-2#TRPBF MS-10 I $3.19 $2.25 Yes
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* The USA 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 Linear Technology 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
DC2418A-A LTC4368-1 Demo Board | UV, OV, OC and Reverse Supply Protection with -50mV Reverse ECB $75.00
DC2418A-B LTC4368-2 Demo Board | UV, OV, OC and Reverse Supply Protection with -3mV Reverse ECB $75.00
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Click here to view our complete list of demo boards


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