LTC3812-5

PRODUCTION

60V Current Mode Synchronous Switching Regulator Controller

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Overview

  • 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

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

Applications

  • 48V Telecom and Base Station Power Supplies
  • Networking Equipment, Servers
  • Automotive and Industrial Control Systems
LTC3812-5
60V Current Mode Synchronous Switching Regulator Controller
High Efficiency High Voltage Step-Down Converter Efficiency vs Load Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3812-5
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
DC1035A

LT3812EFE-5 | 7V ≤ VIN ≤ 60V, VOUT = 3.3V @ 6A

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Product Details

Demonstration circuit 1035 is a current mode synchronous switching regulator featuring the LTC3812-5. The circuit is configured as a synchronous step-down regulator operating at 260kHz switching frequency. The output voltage is 3.3V at 6A maximum load. The input voltage range is 7V to 60V.

DC1035A
LT3812EFE-5 | 7V ≤ VIN ≤ 60V, VOUT = 3.3V @ 6A
DC1035A - Schematic

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