LTC3810 - 100V Current Mode Synchronous Switching Regulator Controller


  • High Voltage Operation: Up to 100V
  • Large 1Ω Gate Drivers
  • No Current Sense Resistor Required
  • Dual N-Channel MOSFET Synchronous Drive
  • Extremely Fast Transient Response
  • ±0.5% 0.8V Voltage Reference
  • Programmable Output Voltage Tracking/Soft-Start
  • Generates 10V Driver Supply from Input Supply
  • Synchronizable to External Clock
  • Selectable Pulse Skip Mode Operation
  • Power Good Output Voltage Monitor
  • Adjustable On-Time/Frequency: tON(MIN) < 100ns
  • Adjustable Cycle-by-Cycle Current Limit
  • Programmable Undervoltage Lockout
  • Output Overvoltage Protection
  • 28-Pin SSOP Package

Typical Application

LTC3810 Typical Application
LTC3810 Typical Application


The LTC3810 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 100V, making it ideal for telecom and automotive applications. The LTC3810 uses a constant on-time valley current control architecture to deliver very low duty cycles with accurate cycle-by-cycle current limit, without requiring a sense resistor.

A precise internal reference provides 0.5% DC accuracy. A high bandwidth (25MHz) error amplifier provides very fast line and load transient response. Large 1Ω gate drivers allow the LTC3810 to drive multiple MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN and can also be synchronized to an external clock for switching-noise sensitive applications. A shutdown pin allows the LTC3810 to be turned off, reducing the supply current to 240μA.

Integrated bias control generates gate drive power from the input supply during start-up and when an output short-circuit occurs, with the addition of a small external SOT23 MOSFET. When in regulation, power is derived from the output for higher efficiency.

Adj UVLO, Sync & Tracking Package
LTC3810 Vin 6.2V to 100V, 10V Driver Voltage Yes SSOP-28
LTC3810-5 Vin 4.35V to 60V, 5.5V Driver Voltage Yes QFN-32
LTC3812-5 Vin 4.35 to 60V, 5.5V Driver Voltage No TSSOP-16E



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
LTC3810EG#PBF SSOP-28 G E 05-08-1640 (G28) Yes
LTC3810EG#TRPBF SSOP-28 G E 05-08-1640 (G28) Yes
LTC3810IG#PBF SSOP-28 G I 05-08-1640 (G28) Yes
LTC3810IG#TRPBF SSOP-28 G I 05-08-1640 (G28) Yes

LTC3810 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
LTC3810EG#PBF SSOP-28 E $5.00 $3.50 Yes
LTC3810EG#TRPBF SSOP-28 E $3.56 Yes
LTC3810IG#PBF SSOP-28 I $5.11 $3.58 Yes
LTC3810IG#TRPBF SSOP-28 I $3.64 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
DC952A LTC3810EG Demo Board | 13V ≤ Vin ≤ 80V; Vout = 12V @ 6A $150.00
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Click here to view our complete list of demo boards


  • 48V Telecom and Base Station Power Supplies
  • Networking Equipment, Servers
  • Automotive and Industrial Control Systems

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Design Tools


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