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LTC3812-5 - 60V Current Mode Synchronous Switching Regulator Controller

Features

  • High Voltage Operation: Up to 60V
  • 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 Soft-Start
  • Generates 5.5V Driver Supply
  • Selectable Pulse-Skipping Mode Operation
  • Power Good Output Voltage Monitor
  • Adjustable On-Time/Frequency: tON(MIN) < 100ns
  • Adjustable Cycle-by-Cycle Current Limit
  • Undervoltage Lockout On Driver Supply
  • Output Overvoltage Protection
  • Thermally Enhanced 16-Pin TSSOP Package

Typical Application

LTC3812-5 Typical Application
LTC3812-5 Typical Application

Description

The LTC3812-5 is a synchronous step-down switching regulator controller that can directly step down voltages from up to 60V input, making it ideal for telecom and automotive applications. The LTC3812-5 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 LTC3812-5 to drive large power MOSFETs for higher current applications. The operating frequency is selected by an external resistor and is compensated for variations in VIN. A shutdown pin allows the LTC3812-5 to be turned off reducing the supply current to <230μA.

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

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
Drawing		 RoHS
LTC3812EFE-5#PBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LTC3812EFE-5#TRPBF TSSOP-16 FE E 05-08-1663 (BC) Yes
LTC3812IFE-5#PBF TSSOP-16 FE I 05-08-1663 (BC) Yes
LTC3812IFE-5#TRPBF TSSOP-16 FE I 05-08-1663 (BC) Yes


LTC3812-5 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
(1-99)		 Price
(1k)*		 RoHS
LTC3812EFE-5#PBF TSSOP-16 E $4.64 $3.25 Yes
LTC3812EFE-5#TRPBF TSSOP-16 E $3.31 Yes
LTC3812IFE-5#PBF TSSOP-16 I $4.79 $3.35 Yes
LTC3812IFE-5#TRPBF TSSOP-16 I $3.41 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
DC1035A LT3812EFE-5 | 7V ≤ VIN ≤ 60V, VOUT = 3.3V @ 6A $150.00
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Click here to view our complete list of demo boards

Applications

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

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Design Tools

LTspice

LTspice® software 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

Models for the following parts are available in LTspice:
LTC3812-5

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3812-5

Technical Support