LTC3865
LTC3865-1
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LTC3865
LTC3865-1

Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs

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LTspice LTC3865 - Step-Down (Buck) Regulators Download 4.81 KB LTspice LTC3865 Demo Circuit - High Efficiency 1.5V @ 15A, 1.2V @ 15A Step-Down Converter Using Sense Resistors Download 7.00KB
Part Models 12
1ku List Price Starting From $3.19
Features
  • Dual, 180° Phased Controllers
  • 2-Pin VID Output Voltage Programming from 0.6V to 5V
  • High Efficiency: Up to 95%
  • RSENSE or DCR Current Sensing
  • Phase-Lockable Fixed Frequency 250kHz to 770kHz
  • Adjustable Current Limit
  • Dual N-Channel MOSFET Synchronous Drive
  • Wide VIN Range: 4.5V to 38V Operation
  • Adjustable Soft-Start Current Ramping or Tracking
  • Output OV Protection With Reverse Current Limit
  • Power Good Output Voltage Monitor
  • 32-Pin 5mm × 5mm QFN and 38-Lead TSSOP Packages
Additional Details
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The LTC3865/LTC3865-1 are high performance dual synchronous step-down DC/DC switching regulator controllers that drive all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 770kHz. Power loss and noise are minimized by operating the two controller output stages out of phase.

OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. Independent track/soft-start pins for each controller ramp the output voltage during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The MODE/PLLIN pin selects among Burst Mode® operation, pulse-skipping mode, and continuous inductor current mode. The output voltages can be precisely programmed by pin strapping or external resistors.

The LTC3865/LTC3865-1 are available in low profile (5mm × 5mm) 32-pin QFN and 38-Lead thermally enhanced TSSOP packages.

Applications

  • DC Power Distribution Systems
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3865 - Step-Down (Buck) Regulators Download 4.81 KB LTspice LTC3865 Demo Circuit - High Efficiency 1.5V @ 15A, 1.2V @ 15A Step-Down Converter Using Sense Resistors Download 7.00KB
Part Models 12
1ku List Price Starting From $3.19
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LTC3865
LTC3865-1

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UPDATED 08/19/2010
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LTC3865: Dual, 2-Phase Synchronous DC/DC Controller with Pin Selectable Outputs Data Sheet

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UPDATED 06/09/2011
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LTC3865: 出力電圧をピンで選択可能なデュアル、2フェーズ、同期整流式DC/DCコントローラ データシート

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User Guide

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UPDATED 01/28/2010
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DC1479A - Demo Manual redirect icon

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UPDATED 10/25/2010
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DC1480A - Demo Manual redirect icon

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3865EFE#PBF 38-Lead TSSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865EFE#TRPBF 38-Lead TSSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865EUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865EUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865EUH-1#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865EUH-1#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IFE#PBF 38-Lead TSSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IFE#TRPBF 38-Lead TSSOP w/ EP external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IUH#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IUH#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IUH-1#PBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
  • HTML
  • Material Declaration external-link
  • HTML
  • Reliablity Data external-link
LTC3865IUH-1#TRPBF 32-Lead QFN (5mm x 5mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3865EFE#PBF

PRODUCTION

LTC3865EFE#TRPBF

PRODUCTION

LTC3865IFE#PBF

PRODUCTION

LTC3865IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

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Material_Report

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Delta Qualification Matrix

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Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3865EUH#PBF

PRODUCTION

LTC3865EUH#TRPBF

PRODUCTION

LTC3865EUH-1#PBF

PRODUCTION

LTC3865EUH-1#TRPBF

PRODUCTION

LTC3865IUH#PBF

PRODUCTION

LTC3865IUH#TRPBF

PRODUCTION

LTC3865IUH-1#PBF

PRODUCTION

LTC3865IUH-1#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

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Material_Report

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Detailed Change Description

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Qualification Results Summary

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PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3865EFE#PBF

PRODUCTION

LTC3865EFE#TRPBF

PRODUCTION

LTC3865IFE#PBF

PRODUCTION

LTC3865IFE#TRPBF

PRODUCTION

pdf

PCN22_0068_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download
Jan 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3865EUH#PBF

PRODUCTION

LTC3865EUH#TRPBF

PRODUCTION

LTC3865EUH-1#PBF

PRODUCTION

LTC3865EUH-1#TRPBF

PRODUCTION

LTC3865IUH#PBF

PRODUCTION

LTC3865IUH#TRPBF

PRODUCTION

LTC3865IUH-1#PBF

PRODUCTION

LTC3865IUH-1#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

external-icon

xls

Material_Report

Download

pdf

Detailed Change Description

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pdf

Qualification Results Summary

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Software & Part Ecosystem

Parts Product Life Cycle Description

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Evaluation Kits 2

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DC1480A

LTC3865EUH-1 Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 3.3V @ 5A, VOUT2 = 1.8V @ 5A

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DC1480A

LTC3865EUH-1 Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 3.3V @ 5A, VOUT2 = 1.8V @ 5A

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DC1480A
LTC3865EUH-1 Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 3.3V @ 5A, VOUT2 = 1.8V @ 5A
Buy Now View Details

Product Detail

Demonstration circuit 1480A is a dual output synchronous buck DC/DC converter featuring the LTC3865EUH-1. The input voltage range is from 4.5V to 14V. The default outputs are 3.3V/5A and 1.8V/5A, but pin programming allows each output to be set at 5V, 3.3V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1V or an adjustable voltage.

Resources

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DC1480A - Schematic Download

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DC1480A - Design Files Download

2.00M

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DC1480A - Demo Manual Download

1.00M

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DC1479A

LTC3865EUH Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 1.5V @ 15A, VOUT2 = 1.2V @ 15A

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DC1479A

LTC3865EUH Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 1.5V @ 15A, VOUT2 = 1.2V @ 15A

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Download

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Print
DC1479A
LTC3865EUH Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 1.5V @ 15A, VOUT2 = 1.2V @ 15A
Buy Now View Details

Product Detail

Demonstration circuit 1479A is a dual output synchronous buck DC/DC converter featuring the LTC3865EUH. The input voltage range is from 4.5V to 14V. The outputs are 1.5V/15A and 1.2V/15A. Each output voltage can be precisely programmed to a preset value within 1% error using two 3-state programming pins. The output voltage can be set to 1.0V, 1.1V, 1.2V, 1.5V, 1.8V, 2.5V 3.3V or 5V. The LTC3865 differs from the LTC3865-1 in that the "-1" has a fixed current limit threshold. The 32-pin package options for both devices have no SGND pin and only one PGND pin.

Resources

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ZIP

DC1479A - Design Files Download

4.00M

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PDF

DC1479A - Schematic Download

83.00K

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PDF

DC1479A - Demo Manual Download

177.00K

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Evaluation Kits2

evaluation kit item images

DC1480A

LTC3865EUH-1 Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 3.3V @ 5A, VOUT2 = 1.8V @ 5A
evaluation kit item images

DC1479A

LTC3865EUH Demo Board | 4.5V ≤ VIN ≤ 14V, VOUT1 = 1.5V @ 15A, VOUT2 = 1.2V @ 15A

Tools & Simulations 1

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LTC3865 - Step-Down (Buck) Regulators Download

4.81 K

spice tool Lt Spice

LTC3865 Demo Circuit - High Efficiency 1.5V @ 15A, 1.2V @ 15A Step-Down Converter Using Sense Resistors Download

7.00K

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