LTC4365 - Overvoltage, Undervoltage and Reverse Supply Protection Controller


  • Wide Operating Voltage Range: 2.5V to 34V
  • Overvoltage Protection to 60V
  • Reverse Supply Protection to –40V
  • LTC4365: Blocks 50Hz and 60Hz AC Power
  • LTC4365-1: Fast (1ms) Recovery from Fault
  • No Input Capacitor or TVS Required for Most Applications
  • Adjustable Undervoltage and Overvoltage Protection Range
  • Charge Pump Enhances External N-Channel MOSFET
  • Low Operating Current: 125μA
  • Low Shutdown Current: 10μA
  • Compact 8-Lead, 3mm × 2mm DFN and TSOT-23 (ThinSOT™) Packages

Typical Application

LTC4365 Typical Application
LTC4365 Typical Application


The LTC®4365 protects applications where power supply input voltages may be too high, too low or even negative. It does this by controlling the gate voltages of a pair of external N-channel MOSFETs to ensure that the output stays within a safe operating range.The LTC4365 can withstand voltages between –40V and 60V and has an operating range of 2.5V to 34V, while consuming only 125μA in normal operation.

Two comparator inputs allow configuration of the overvoltage (OV) and undervoltage (UV) set points using an external resistive divider. A shutdown pin provides external control for enabling and disabling the MOSFETs as well as placing the device in a low current shutdown state. A fault output provides status of the gate pin pulling low. A fault is indicated when the part is in shutdown or the input voltage is outside the UV and OV set points.

The LTC4365 has a 36ms turn-on delay that debounces live connections and blocks 50Hz to 60Hz AC power. For fast recovery after faults, the LTC4365-1 has a reduced 1ms turn-on delay.


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

DFN-8, SOT-23

LTC4365 Package Drawing
LTC4365 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC4365CDDB-1#PBF DFN 8 C $2.18 View
LTC4365CDDB-1#TRMPBF DFN 8 C $2.18 $1.54 View
LTC4365CDDB-1#TRPBF DFN 8 C $2.13 $1.49 View
LTC4365CDDB#PBF DFN 8 C $2.18 View
LTC4365CDDB#TRMPBF DFN 8 C $2.18 $1.54 View
LTC4365CDDB#TRPBF DFN 8 C $2.13 $1.49 View
LTC4365CTS8-1#PBF SOT 8 C $2.18 View
LTC4365CTS8-1#TRMPBF SOT 8 C $2.18 $1.54 View
LTC4365CTS8-1#TRPBF SOT 8 C $2.13 $1.49 View
LTC4365CTS8#PBF SOT 8 C $2.18 View
LTC4365CTS8#TRMPBF SOT 8 C $2.18 $1.54 View
LTC4365CTS8#TRPBF SOT 8 C $2.13 $1.49 View
LTC4365HDDB-1#PBF DFN 8 H $2.63 View
LTC4365HDDB-1#TRMPBF DFN 8 H $2.63 $1.85 View
LTC4365HDDB-1#TRPBF DFN 8 H $2.58 $1.80 View
LTC4365HDDB#PBF DFN 8 H $2.63 View
LTC4365HDDB#TRMPBF DFN 8 H $2.63 $1.85 View
LTC4365HDDB#TRPBF DFN 8 H $2.58 $1.80 View
LTC4365HTS8-1#PBF SOT 8 H $2.63 View
LTC4365HTS8-1#TRMPBF SOT 8 H $2.63 $1.85 View
LTC4365HTS8-1#TRPBF SOT 8 H $2.58 $1.80 View
LTC4365HTS8#PBF SOT 8 H $2.63 View
LTC4365HTS8#TRMPBF SOT 8 H $2.63 $1.85 View
LTC4365HTS8#TRPBF SOT 8 H $2.58 $1.80 View
LTC4365IDDB-1#PBF DFN 8 I $2.39 View
LTC4365IDDB-1#TRMPBF DFN 8 I $2.39 $1.69 View
LTC4365IDDB-1#TRPBF DFN 8 I $2.34 $1.64 View
LTC4365IDDB#PBF DFN 8 I $2.39 View
LTC4365IDDB#TRMPBF DFN 8 I $2.39 $1.69 View
LTC4365IDDB#TRPBF DFN 8 I $2.34 $1.64 View
LTC4365ITS8-1#PBF SOT 8 I $2.39 View
LTC4365ITS8-1#TRMPBF SOT 8 I $2.39 $1.69 View
LTC4365ITS8-1#TRPBF SOT 8 I $2.34 $1.64 View
LTC4365ITS8#PBF SOT 8 I $2.39 View
LTC4365ITS8#TRMPBF SOT 8 I $2.39 $1.69 View
LTC4365ITS8#TRPBF SOT 8 I $2.34 $1.64 View
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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
DC1555B LTC4365CTS8 Demo Board: High Voltage NFET Driver for UV, OV and Reverse Supply Protection $25.00
DC1555C-B LTC4365CTS8-1 Demo Board | High Voltage NFET Driver for UV, OV and Reverse Supply Protection with 1ms Fault Recovery $25.00
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