LTC3869
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LTC3869

Dual, 2-Phase Synchronous Step-Down DC/DC Controllers

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LTspice LTC3869 - Step-Down (Buck) Regulators Download 5.85 KB LTspice LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Inductor DCR Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download 7.00KB LTspice LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Rsense Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download 7.00KB LTspice LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Rsense Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download 8.00KB LTspice LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Inductor DCR Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download 7.00KB
Part Models 10
1ku List Price Starting From $3.19
Features
  • Dual, 180° Phased Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • Accurate Multiphase Current Matching
  • RSENSE or DCR Current Sensing
  • ±0.75% 0.6V Output Voltage Accuracy
  • Phase-Lockable Fixed Frequency 250kHz to 780kHz
  • High Efficiency: Up to 95%
  • Dual N-channel MOSFET Synchronous Drive
  • Wide VIN Range: 4V to 38V (40V Max) Operation
  • Wide VOUT Range: 0.6V to 12.5V Operation
  • Adjustable Soft-Start Current Ramping or Tracking
  • Foldback Output Current Limiting
  • Output Overvoltage Protection
  • Power Good Output Voltage Monitor
  • 5V Low Dropout Regulator
  • Small 28-Lead QFN and Narrow SSOP Packages
Additional Details
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The LTC3869 is a high performance dual synchronous step-down switching regulator controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 780kHz. Power loss and noise due to the ESR of the input capacitors 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. A wide 4V to 38V input supply range encompasses most battery chemistries. Independent TK/SS 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, or continuous inductor current mode and allows the IC to be synchronized to an external clock.

The LTC3869 is available in low profile 4mm × 4mm and 4mm × 5mm QFN packages. The LTC3869-2 is available in an SSOP-28 package. The LTC3869 is pin-compatible with the LTC3850.

Applications

  • Server Systems
  • Telecom Systems
  • Industrial and Medical Instruments
  • High Power Battery-Operated Devices
  • DC Power Distribution Systems
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file View Data Sheet
Documentation View All Documentation
LTspice LTC3869 - Step-Down (Buck) Regulators Download 5.85 KB LTspice LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Inductor DCR Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download 7.00KB LTspice LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Rsense Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download 7.00KB LTspice LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Rsense Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download 8.00KB LTspice LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Inductor DCR Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download 7.00KB
Part Models 10
1ku List Price Starting From $3.19
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LTC3869

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Data Sheet

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UPDATED 09/28/2015
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LTC3869: Dual, 2-Phase Synchronous Step-Down DC/DC Controllers Data Sheet

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UPDATED 07/05/2013
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LTC3869: デュアル、2フェーズ同期整流式降圧 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 07/21/2011
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UPDATED 07/15/2011
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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
LTC3869EUF#PBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LTC3869EUF#TRPBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LTC3869EUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3869EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3869IGN-2#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3869IGN-2#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3869IUF#PBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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LTC3869IUF#TRPBF 28-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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LTC3869IUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3869IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3869EUF#PBF

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Detailed Change Description

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Dec 28, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3869EUF#PBF

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LTC3869EUF#TRPBF

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LTC3869EUFD#PBF

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LTC3869IGN-2#PBF

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PCN20_0245_Form

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Material_Report

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Delta Qualification Matrix

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Qualification Results Summary

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Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

LTC3869IGN-2#PBF

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LTC3869IGN-2#TRPBF

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Jan 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3869EUF#PBF

PRODUCTION

LTC3869EUF#TRPBF

PRODUCTION

LTC3869EUFD#PBF

PRODUCTION

LTC3869EUFD#TRPBF

PRODUCTION

LTC3869IUF#PBF

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LTC3869IUF#TRPBF

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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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Dec 28, 2020

- 20_0245

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Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3869EUF#PBF

PRODUCTION

LTC3869EUF#TRPBF

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LTC3869EUFD#PBF

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LTC3869EUFD#TRPBF

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LTC3869IGN-2#PBF

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LTC3869IUFD#TRPBF

PRODUCTION

pdf

PCN20_0245_Form

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xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

pdf

Other

external-icon

pdf

Qualification Results Summary

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Aug 10, 2022

- 22_0177

arrow down

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

LTC3869IGN-2#PBF

PRODUCTION

LTC3869IGN-2#TRPBF

PRODUCTION

pdf

PCN22_0177_Form

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Delta Qualification Matrix

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Software & Part Ecosystem

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Evaluation Kits 4

reference details image

DC1798A-B

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with DCR Sense

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DC1798A-B

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with DCR Sense

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DC1798A-B
LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with DCR Sense
Buy Now View Details

Product Detail

Demonstration circuit 1798A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3869IGN-2. It provides 2.5V/5A and 3.3V/5A outputs. The input voltage range is 4.5V to 26V. DC1798A-A has an on-board sense resistor for current feedback, while the DC1798A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Resources

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PDF

DC1798A - Schematic Download

63.00K

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ZIP

DC1798A- Design Files Download

0.00M

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PDF

DC1798A - Demo Manual Download

322.00K

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DC1807A-A

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with RSENSE

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DC1807A-A

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with RSENSE

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Download

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DC1807A-A
LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with RSENSE
Buy Now View Details

Product Detail

Demonstration circuit 1807A is a dual output, dual phase synchronous buck converter featuring the LTC3869EUFD. The input voltage range is 4.5V to 14V, output voltages and currents are 1.5V/15A and 1.2V/15A. Two versions of the board are available. DC1807A-A has an on-board sense resistor for current feedback, while the DC1807A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Resources

pdf icon

PDF

DC1807A - Schematic Download

81.00K

pdf icon

PDF

DC1807A - Demo Manual Download

307.00K

pdf icon

ZIP

DC1807A - Design Files Download

4.00M

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reference details image

DC1798A-A

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1= 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with RSENSE

zoom

DC1798A-A

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1= 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with RSENSE

download icon

Download

 print icon

Print
DC1798A-A
LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1= 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with RSENSE
Buy Now View Details

Product Detail

Demonstration circuit 1798A is a Dual Output, Dual Phase 5A Synchronous Buck Converter featuring the LTC3869IGN-2. It provides 2.5V/5A and 3.3V/5A outputs. The input voltage range is 4.5V to 26V. DC1798A-A has an on-board sense resistor for current feedback, while the DC1798A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Resources

pdf icon

PDF

DC1798A - Schematic Download

63.00K

pdf icon

ZIP

DC1798A- Design Files Download

0.00M

pdf icon

PDF

DC1798A - Demo Manual Download

322.00K

Show More Arrow image
reference details image

DC1807A-B

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with DCR Sense

zoom

DC1807A-B

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with DCR Sense

download icon

Download

 print icon

Print
DC1807A-B
LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with DCR Sense
Buy Now View Details

Product Detail

Demonstration circuit 1807A is a dual output, dual phase synchronous buck converter featuring the LTC3869EUFD. The input voltage range is 4.5V to 14V, output voltages and currents are 1.5V/15A and 1.2V/15A. Two versions of the board are available. DC1807A-A has an on-board sense resistor for current feedback, while the DC1807A-B is configured with a DCR sense circuit that allows the converter to use the inductors DCR as the sense element instead of the on-board sense resistors to save cost and board space and improves efficiency.

Resources

pdf icon

PDF

DC1807A - Schematic Download

81.00K

pdf icon

PDF

DC1807A - Demo Manual Download

307.00K

pdf icon

ZIP

DC1807A - Design Files Download

4.00M

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Evaluation Kits4

evaluation kit item images

DC1798A-B

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1 = 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with DCR Sense
evaluation kit item images

DC1807A-A

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with RSENSE
evaluation kit item images

DC1798A-A

LTC3869IGN-2 Demo Board | VIN = 4.5V to 26V, VOUT1= 3.3V @ 5A, VOUT2 = 2.5V @ 5A, with RSENSE
evaluation kit item images

DC1807A-B

LTC3869EUFD Demo Board | VIN = 4.5V to 14V, VOUT1 = 1.5V @15A, VOUT2 = 1.2V @ 15A, with DCR Sense

Tools & Simulations 2

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

LTC3869 - Step-Down (Buck) Regulators Download

5.85 K

spice tool Lt Spice

LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Inductor DCR Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download

7.00K

spice tool Lt Spice

LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Rsense Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download

7.00K

spice tool Lt Spice

LTC3869-2 Demo Circuit - High Efficiency Dual 3.3V/2.5V Buck Converter using Rsense Current Sensing (4.5-26V to 3.3V & 2.5V @ 5A) Download

8.00K

spice tool Lt Spice

LTC3869 Demo Circuit - High Efficiency Dual 1.5V/1.2V Buck Converter using Inductor DCR Current Sensing (4.5-14V to 1.5V & 1.2V @ 15A) Download

7.00K

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