LTC3864

PRODUCTION

60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability

Data Sheet (Rev. C) Product Selection Table
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Overview

  • Wide Operating VIN Range: 3.5V to 60V
  • Wide VOUT Range: 0.8V to VIN
  • Low Operating IQ = 40μA
  • Very Low Dropout Operation: 100% Duty Cycle
  • Strong High Voltage MOSFET Gate Driver
  • Constant Frequency Current Mode Architecture
  • Verified FMEA for Adjacent Pin Open/Short
  • Selectable High Efficiency Burst Mode® Operation or Pulse-Skipping Mode at Light Loads
  • Programmable Fixed Frequency: 50kHz to 850kHz
  • Phase-Lockable Frequency: 75kHz to 750kHz
  • Accurate Current Limit
  • Programmable Soft-Start or Voltage Tracking
  • Internal Soft-Start Guarantees Smooth Start-Up
  • Power Good Output Voltage Monitor
  • Low Shutdown IQ = 7μA
  • Available in Small 12-Pin Thermally Enhanced MSOP and DFN Packages
  • AEC-Q100 Qualified for Automotive Applications
LTC3864
60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability
5.2V to 60V Input, 5V/2A Output, 350kHz Step-Down Converter Efficiency Product Package 1 Product Package 2
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Documentation

Data Sheet 1

User Guide 2

Technical Articles 1

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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
Hot Swap Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LTC3864

LTpowerCAD 3

Design tools for the following parts are available in LTpowerCAD:

  • LTC3864
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.

LTpowerCAD

LTpowerCAD® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2434A

LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, VOUT = 12V @ 5A

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Product Details

Demonstration circuit 2434A is a high voltage, current mode DC/DC step-down converter featuring the LTC3864.


The board operates from an input range of 6V to 60V and provides a 12V, 5A output when the input exceeds 12V. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle and function as a saturated switch below the regulation threshold, down to 6VIN. It operates at 200kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode® operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided.


 


eval board
schematic 5
schematic 6
schematic 7
schematic 8
DC2434A

LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, VOUT = 12V @ 5A

Buy Now View Details

Product Details

Demonstration circuit 2434A is a high voltage, current mode DC/DC step-down converter featuring the LTC3864.


The board operates from an input range of 6V to 60V and provides a 12V, 5A output when the input exceeds 12V. The PMOSFET architecture allows it to operate seamlessly up to 100% duty cycle and function as a saturated switch below the regulation threshold, down to 6VIN. It operates at 200kHz and may be synchronized to an external clock. A soft-start feature controls output voltage slew rate at start-up, reducing current surge and voltage overshoot. Burst Mode® operation that improves efficiency at light loads can be enabled with a jumper. A power good output signal is provided.


 


eval board
schematic 9
schematic 10
DC1722A

LTC3864EMSE Demo Board | 5.5V ≤ VIN ≤ 55V; VOUT = 5V @ 2A

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Product Details

DC1722A: Demo Board for the LTC3864 60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability.

eval board
schematic 11
schematic 12
DC1722A

LTC3864EMSE Demo Board | 5.5V ≤ VIN ≤ 55V; VOUT = 5V @ 2A

Buy Now View Details

Product Details

DC1722A: Demo Board for the LTC3864 60V Low IQ Step-Down DC/DC Controller with 100% Duty Cycle Capability.
DC2434A
LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, VOUT = 12V @ 5A
DC2434A Evaluation Board DC2434A Evaluation Board - Top View DC2434A Evaluation Board - Bottom View DC2434A - Schematic
DC2434A
LTC3864 Demo Board | Buck Controller, 12V ≤ VIN ≤ 60V, VOUT = 12V @ 5A
DC2434A Evaluation Board DC2434A Evaluation Board - Top View DC2434A Evaluation Board - Bottom View DC2434A - Schematic
DC1722A
LTC3864EMSE Demo Board | 5.5V ≤ VIN ≤ 55V; VOUT = 5V @ 2A
DC1722A Demo Board DC1722A - Schematic
DC1722A
LTC3864EMSE Demo Board | 5.5V ≤ VIN ≤ 55V; VOUT = 5V @ 2A
DC1722A Demo Board DC1722A - Schematic

Latest Discussions

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