LTC3810 - 100V Current Mode Synchronous Switching Regulator Controller

Features

  • 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

Description

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.

  Features
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

 

Packaging

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

SSOP-28

LTC3810 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3810EG#PBF SSOP 28 E $5.00 $3.50 View
LTC3810EG#TRPBF SSOP 28 E $3.56 View
LTC3810EUH-5#PBF QFN 32 E $4.83 $3.38 View
LTC3810EUH-5#TRPBF QFN 32 E $3.44 View
LTC3810HUH-5#PBF QFN 32 H $5.37 $3.76 View
LTC3810HUH-5#TRPBF QFN 32 H $3.82 View
LTC3810IG SSOP 28 I $5.11 $3.58 View
LTC3810IG#PBF SSOP 28 I $5.11 $3.58 View
LTC3810IG#TRPBF SSOP 28 I $3.64 View
LTC3810IUH-5#PBF QFN 32 I $4.96 $3.47 View
LTC3810IUH-5#TRPBF QFN 32 I $3.53 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
DC952A LTC3810EG Demo Board | 13V ≤ Vin ≤ 80V; Vout = 12V @ 6A $150.00
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Applications

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

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Design Tools

LTspiceIV

LTspice IV 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 IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
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To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3810
LTC3810-5

Technical Support