LTC3789

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet Product Selection Table
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Overview

  • 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
LTC3789
High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
Efficiency and Power Loss Product Package 1 Product Package 2
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Documentation

Data Sheet 1

User Guide 6

Application Note 1

Design Note 2

Technical Articles 2

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
Hot Swap Controllers 1
LTC4380
RECOMMENDED FOR NEW DESIGNS Low Quiescent Current Surge Stopper
Switching Regulators & Controllers 1
LTC3891
RECOMMENDED FOR NEW DESIGNS Low IQ, 60V Synchronous Step-Down Controller
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3789

LTpowerCAD 3

Design tools for the following parts are available in LTpowerCAD:

  • LTC3789
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
DC1878A

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

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Product Details

This evaluation board is obsolete and no longer recommended.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.

eval board
schematic 2
DC2253A

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

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Product Details

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.

eval board
schematic 3
DC1721A

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

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Product Details

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


 


eval board
schematic 4
schematic 5
schematic 6
schematic 7
schematic 8
DC1523A

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

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Product Details

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.

eval board
schematic 9
DC1881A

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

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Product Details

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.

eval board
schematic 10
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schematic 12
schematic 13
DC1757B

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

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Product Details

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.


 


 
DC1878A
OBSOLETE: LTC3789EGN Demo Board I VIN Range: 8V to 75V, VOUT: 12V @ 5A
DC1878A - Schematic
DC2253A
LTC3789EGN Demo Board | Synchronous Buck-Boost, 6V ≤ VIN ≤ 36V; VOUT = 12V @ 25A
DC2253A - Schematic
DC1721A
LTC4000EGN/LTC3789EGN Demo Board u 14.6V, 5A Battery Charger with 6VIN to 36VIN Buck-Boost Converter
DC1721A - Schematic
DC1523A
LTC3789EGN Demo Board | Synchronous Buck-Boost Controller, 5V ≤ VIN ≤ 36V, VOUT = 12V @ 5A
DC1523A Demo Board DC1523A Demo Board DC1523A Demo Board DC1523A Demo Board DC1523A - Schematic
DC1881A
LTC3789EUFD Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 2.5A
DC1881A - Schematic
DC1757B
LTC3789EGN Buck-Boost Demo Board | VIN = 6V to 36V, VOUT = 12V @ 12A
DC1757B Evaluation Board DC1757B Evaluation Board - Top View DC1757B Evaluation Board - Bottom View DC1757B - Demo Board Image

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