LTC3720

PRODUCTION

Single Phase VRM8.5 Current Mode Step-Down Controller

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Overview

  • 5-Bit Programmable Output Voltage: 1.05V to 1.825V (VRM8.5)
  • No Sense Resistor Required
  • 2% to 87% Duty Cycle at 200kHz
  • tON(MIN) ≤ 100ns
  • Supports Active Voltage Positioning
  • True Current Mode Control
  • Stable with Ceramic COUT
  • Dual N-Channel MOSFET Synchronous Drive
  • Power Good Output Voltage Monitor
  • Wide VIN Range: 4V to 36V
  • ±1% 0.8V Reference
  • Adjustable Current Limit
  • Adjustable Switching Frequency
  • Forced Continuous Control Pin
  • Programmable Soft-Start
  • Output Overvoltage Protection
  • Optional Short-Circuit Shutdown Timer
  • Micropower Shutdown: IQ < 30µA
  • Available in 28-Lead Narrow SSOP Package

The LTC3720 is a synchronous step-down switching regulator controller for CPU power. An output voltage between 1.05V and 1.825V is selected by a 5-bit code (Intel VRM8.5 VID specification). The controller uses a valley current control architecture to deliver very low duty cycles without requiring a sense resistor. Operating frequency is selected by an external resistor and is compensated for variations in VIN and VOUT.

Discontinuous mode operation provides high efficiency operation at light loads. A forced continuous control pin reduces noise and RF interference and can assist secondary winding regulation by disabling discontinuous mode operation when the main output is lightly loaded.

Fault protection is provided by internal foldback current limiting, an output overvoltage comparator and optional short-circuit shutdown timer. Soft-start capability for supply sequencing is accomplished using an external timing capacitor. The regulator current limit level is also user programmable. Wide supply range allows operation from 4V to 36V at the input.

Applications

  • Power Supplies for Pentium® Processors
  • Notebook Computers and Servers
LTC3720
Single Phase VRM8.5 Current Mode Step-Down Controller
Figure 1. High Efficiency Step-Down Converter Efficiency vs Output Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC3720
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Evaluation Kits

eval board
schematic 1
DC483A

LTC3720EGN | VRM 8.5 Processor Power Supply, 7.5V to 21VIN, 1.05V to 1.825VOUT @ 20A

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Product Details

DC483A: Demo Board for the LTC3720 Single Phase VRM8.5 Current Mode Step-Down Controller.
DC483A
LTC3720EGN | VRM 8.5 Processor Power Supply, 7.5V to 21VIN, 1.05V to 1.825VOUT @ 20A
DC483A - Schematic

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