LTC3789
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LTC3789

High Efficiency, Synchronous, 4-Switch Buck-Boost Controller

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LTspice LTC3789 Demo Circuit - 12V Automotive Buck-Boost Solution with Programmable Output Current Limit (4-38V to 12V @ 5A) Download 6.00KB LTspice LTC3789 - Buck-Boost Regulators Download 5.53 KB
Part Models 8
1ku List Price Starting From $5.60
Features
  • Single Inductor Architecture Allows VIN Above, Below or Equal to the Regulated VOUT
  • Programmable Input or Output Current
  • Wide VIN Range: 4V to 38V
  • 1% Output Voltage Accuracy: 0.8V < VOUT < 38V
  • Synchronous Rectification: Up to 98% Efficiency
  • Current Mode Control
  • Phase-Lockable Fixed Frequency: 200kHz to 600kHz
  • No Reverse Current During Start-Up
  • Power Good Output Voltage Monitor
  • Internal 5.5V LDO
  • Quad N-Channel MOSFET Synchronous Drive
  • VOUT Disconnected from VIN During Shutdown
  • True Soft-Start and VOUT Short Protection, Even in Boost Mode
  • Available in 28-Lead QFN (4mm × 5mm) and 28-Lead SSOP Packages
Additional Details
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The LTC3789 is a high performance buck-boost switching regulator controller that operates from input voltages above, below or equal to the output voltage. The constant-frequency, current mode architecture allows a phase-lockable frequency of up to 600kHz, while an output current feedback loop provides support for battery charging. With a wide 4V to 38V (40V maximum) input and output range and seamless, low noise transitions between operating regions, the LTC3789 is ideal for automotive, telecom and battery-powered systems.

The operating mode of the controller is determined through the MODE/PLLIN pin. The MODE/PLLIN pin can select between pulse-skipping mode and forced continuous mode operation and allows the IC to be synchronized to an external clock. Pulse-skipping mode offers high efficiency and low ripple at light loads, while forced continuous mode operates at a constant frequency for noise-sensitive applications.

A PGOOD pin indicates when the output is within 10% of its designed set point. The LTC3789 is available in low profile 28-pin 4mm × 5mm QFN and narrow SSOP packages.

Applications

  • Automotive Systems
  • Distributed DC Power Systems
  • High Power Battery-Operated Devices
  • Industrial Control
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Documentation View All Documentation
LTspice LTC3789 Demo Circuit - 12V Automotive Buck-Boost Solution with Programmable Output Current Limit (4-38V to 12V @ 5A) Download 6.00KB LTspice LTC3789 - Buck-Boost Regulators Download 5.53 KB
Part Models 8
1ku List Price Starting From $5.60
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LTC3789

Documentation

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Data Sheet

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UPDATED 11/11/2014
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LTC3789: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller Data Sheet

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UPDATED 01/26/2015
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LTC3789: 高効率、同期整流式4スイッチ昇降圧コントローラ データシート

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User Guide

6

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UPDATED 07/07/2017
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DC1757B - Demo Manual redirect icon

392.00K

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UPDATED 07/26/2012
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DC1881A - Demo Manual redirect icon

194.00K

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UPDATED 10/20/2014
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DC2253A - Demo Manual redirect icon

716.00K

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UPDATED 03/27/2012
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DC1878A - Demo Manual redirect icon

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UPDATED 06/21/2011
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DC1721A-A - Demo Manual redirect icon

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UPDATED 12/10/2010
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DC1523A - Demo Manual redirect icon

462.00K

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Design Note

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UPDATED 02/22/2012
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DN499 - High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit redirect icon

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UPDATED 02/10/2012
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DN499 - 高效率四开关降压-升压型控制器可提供准确的输出电流限值 redirect icon

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UPDATED 07/03/2012
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DN499 - 高効率の4 スイッチ昇降圧コントローラにより 正確な出力電流制限を実現 redirect icon

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UPDATED 11/08/2022
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Design Note 499: High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit redirect icon

Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

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Technical Articles

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UPDATED 04/01/2012
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High Voltage, High Current Battery Charger Works with All Converter Topologies, Any Battery Configuration redirect icon

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UPDATED 09/02/2016
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How NOT to Damage Your Switching Regulator Demo Board redirect icon

Application Note

3

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UPDATED 09/01/2019
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AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies redirect icon

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UPDATED 09/01/2019
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AN-140：线性调节器和开关模式电源的基本概念 redirect icon

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UPDATED 09/01/2019
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AN-140: リニア・レギュレータとスイッチング電源の基本概念 redirect icon

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Documentation

Technical Documents 13
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Data Sheet 1

LTC3789: High Efficiency, Synchronous, 4-Switch Buck-Boost Controller Data Sheet

Reliability Data 1

R526 Reliability Data

User Guide 6

DC1757B - Demo Manual
DC1881A - Demo Manual
DC2253A - Demo Manual
DC1878A - Demo Manual
DC1721A-A - Demo Manual
DC1523A - Demo Manual

Application Note 1

AN-140: Basic Concepts of Linear Regulator and Switching Mode Power Supplies

Design Note 2

DN499 - High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit
Design Note 499: High Efficiency 4-Switch Buck-Boost Controller Provides Accurate Output Current Limit

Technical Articles 2

High Voltage, High Current Battery Charger Works with All Converter Topologies, Any Battery Configuration
How NOT to Damage Your Switching Regulator Demo Board

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
LTC3789EGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3789EGN#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3789EUFD#PBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3789EUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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LTC3789IGN#PBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3789IGN#TRPBF 28-Lead SSOP (Narrow 0.15 Inch) external-link
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LTC3789IUFD#PBF 28-Lead QFN (4mm 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
LTC3789IUFD#TRPBF 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP) external-link
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Aug 10, 2022

- 22_0177

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

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Jul 31, 2020

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

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LTC3789IUFD#TRPBF

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

LTC3789EGN#PBF

PRODUCTION

LTC3789EGN#TRPBF

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LTC3789IGN#PBF

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LTC3789IGN#TRPBF

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PCN22_0177_Form

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Delta Qualification Matrix

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Jul 31, 2020

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

LTC3789EGN#PBF

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LTC3789EGN#TRPBF

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LTC3789EUFD#PBF

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LTC3789EUFD#TRPBF

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LTC3789IGN#PBF

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LTC3789IGN#TRPBF

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LTC3789IUFD#PBF

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LTC3789IUFD#TRPBF

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PCN20_0245_Form

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Qualification Results Summary

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PRODUCTION

80V VIN and VOUT Synchronous 4-Switch Buck-Boost DC/DC Controller

Evaluation Kits 6

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DC1757B

LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A

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DC1757B

LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A

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DC1757B
LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A
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Product Detail

Demonstration circuit 1757B is a high efficiency synchronous buck-boost DC/DC converter with a 6V to 36V input voltage range. It can supply a 12A maximum load current with a 12V output. The demo board features the LTC3789EGN controller. The constant frequency current mode architecture allows a phase-lockable frequency of up to 600kHz, while an optional output current feedback loop provides support for applications such as battery charging. With a wide input range, wide output range and seamless transfers between operation modes, the LTC3789 is ideal for automotive, telecom, distributed DC power systems and battery-powered applications.


 


 


Resources

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DC1757B - Demo Manual Download

392.00K

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DC1757B - Design Files Download

1.00M

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DC1757B - Schematic Download

42.00K

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DC1878A

OBSOLETE: LTC3789EGN Demo Board I VIN Range: 8V to 75V, VOUT: 12V @ 5A

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DC1878A

OBSOLETE: LTC3789EGN Demo Board I VIN Range: 8V to 75V, VOUT: 12V @ 5A

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DC1878A
OBSOLETE: LTC3789EGN Demo Board I VIN Range: 8V to 75V, VOUT: 12V @ 5A
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Product Detail

This evaluation board is obsolete and no longer recommended. The replacement board is the DC2519A.

Demonstration circuit 1878A features the LTC3789EGN, a high efficiency switching step-up/down controller. The input range has been extended to 75V by using a LTC4444-5 MOSFET driver on the input side. The minimum input voltage is 8V. The output voltage is 12V. The board is capable of delivering up to 5A of output current over the input voltage range. The LTC3789EGN is a high performance switching regulator controller designed to regulate the output using input voltages above, below or equal to the output voltage.

Synchronous operation provides very high efficiency, up to 97%. Constant frequency current mode architecture allows phase-lockable frequency from 200kHz to 600kHz. An accurate output current limit provides support for battery charging.

Resources

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DC1878A - Demo Manual Download

0.00M

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DC1878A - Schematic Download

93.00K

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DC1878A - Design Files Download

4.00M

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DC2253A

LTC3789EGN Demo Board | Synchronous Buck-Boost, 6V ≤ VIN ≤ 36V; VOUT = 12V @ 25A

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DC2253A

LTC3789EGN Demo Board | Synchronous Buck-Boost, 6V ≤ VIN ≤ 36V; VOUT = 12V @ 25A

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DC2253A
LTC3789EGN Demo Board | Synchronous Buck-Boost, 6V ≤ VIN ≤ 36V; VOUT = 12V @ 25A
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Product Detail

Demonstration circuit 2253A is a high power, high efficiency, 2-phase interleaved synchronous buck-boost converter with a 6V to 36V input range. It can supply a 25A maximum load current with a 12V output. This demo board features 2x LTC3789EGN controllers.

Resources

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DC2253A - Schematic Download

90.00K

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DC2253A - Demo Manual Download

716.00K

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DC2253A - Design Files Download

3.00M

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DC1721A

LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter

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DC1721A

LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter

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DC1721A
LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter
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Product Detail

DC1721A Demo Board for:
LTC4000 High Voltage High Current Controller for Battery Charging and Power Management
LTC3789 High Efficiency, Synchronous, 4-Switch. Buck-Boost Controller


 


Resources

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DC1721A - Schematic Download

114.00K

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DC1721A-A - Demo Manual Download

210.00K

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DC1721A-A - Design Files Download

1.00M

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DC1523A

LTC3789EGN Demo Board | Synchronous Buck-Boost Controller, 5V ≤ VIN ≤ 36V, VOUT = 12V @ 5A

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DC1523A

LTC3789EGN Demo Board | Synchronous Buck-Boost Controller, 5V ≤ VIN ≤ 36V, VOUT = 12V @ 5A

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DC1523A
LTC3789EGN Demo Board | Synchronous Buck-Boost Controller, 5V ≤ VIN ≤ 36V, VOUT = 12V @ 5A
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Product Detail

Demonstration circuit 1523A features the LTC3789EGN, a high efficiency switching step-up/down controller. The DC1523A input range is from 5V to 36V. The output voltage is 12V. The board is capable of delivering up to 5A of output current over the input voltage range. The LTC3789EGN is a high performance switching regulator controller designed to regulate the output using input voltages above, below or equal to the output voltage.


Synchronous operation provides very high efficiency, up to 97%. Constant frequency current mode architecture allows phase-lockable frequency from 200kHz to 600kHz. An accurate output current limit provides support for battery charging.

Resources

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PDF

DC1523A - Schematic Download

82.00K

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PDF

DC1523A - Demo Manual Download

462.00K

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DC1523A - Design Files Download

1.00M

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DC1881A

LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A

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DC1881A

LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A

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DC1881A
LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A
Buy Now View Details

Product Detail

Demonstration circuit 1881A is a high efficiency synchronous buck-boost DC/DC converter with 6V to 36V input range. It can supply 2.5A maximum load current at 12V output. The demo board features the LTC3789EUFD controller. The constant-frequency current mode architecture allows a phase-lockable frequency of up to 600kHz, while an optional output current feedback loop provides support for applications such as battery charging. With a wide input range, wide output range and seamless transfers between operation modes, the LTC3789 is ideal for automotive, telecom, distributed DC power systems and battery-powered applications. This board has a compact solution size with dual SO-8 MOSFETs, small inductor and capacitor footprints. The package of LTC3789EUFD is a small, low thermal impedance 4mm × 5mm 28-Lead QFN.

Resources

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ZIP

DC1881A - Design Files Download

841.00K

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PDF

DC1881A - Schematic Download

57.00K

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DC1881A - Demo Manual Download

194.00K

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Evaluation Kits6

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DC1757B

LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A
evaluation kit item images

DC1878A

OBSOLETE: LTC3789EGN Demo Board I VIN Range: 8V to 75V, VOUT: 12V @ 5A
evaluation kit item images

DC2253A

LTC3789EGN Demo Board | Synchronous Buck-Boost, 6V ≤ VIN ≤ 36V; VOUT = 12V @ 25A
evaluation kit item images

DC1721A

LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter
evaluation kit item images

DC1523A

LTC3789EGN Demo Board | Synchronous Buck-Boost Controller, 5V ≤ VIN ≤ 36V, VOUT = 12V @ 5A
evaluation kit item images

DC1881A

LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A

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

LTC3789 Demo Circuit - 12V Automotive Buck-Boost Solution with Programmable Output Current Limit (4-38V to 12V @ 5A) Download

6.00K

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LTC3789 - Buck-Boost Regulators Download

5.53 K

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