LT8390A

RECOMMENDED FOR NEW DESIGNS

60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum

Data Sheet (Rev. C) Product Selection Table
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Overview

  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Up to 95% Efficiency at 2MHz
  • Proprietary Peak-Buck Peak-Boost Current Mode
  • Wide VIN Range: 4V to 60V
  • ±1.5% Output Voltage Accuracy: 1V ≤ VOUT ≤ 60V
  • ±3% Input or Output Current Accuracy with Monitor
  • Spread Spectrum Frequency Modulation for Low EMI
  • High Side PMOS Load Switch Driver
  • No Top MOSFET Refresh Noise in Buck or Boost
  • Adjustable and Synchronizable: 600kHz to 2MHz
  • VOUT Disconnected from VIN During Shutdown
  • Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)
  • AEC-Q100 Qualified for Automotive Applications
LT8390A
60V 2MHz Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum
LT8390A Application Circuit LT8390A Performance Graph LT8390A Pin Configuration LT8390A Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Design Note 2

Technical Articles 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Ideal Diodes and PowerPath Controllers 1
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RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
Overvoltage & Overcurrent Protectors 1
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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

  • LT8390
  • LT8390A

LTpowerCAD 1

Design tools for the following parts are available in LTpowerCAD:

  • LT8390
  • LT8390A
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
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DC2598A

LT8390A Demo Board | VIN = 4V to 24V, (60V Transient) with VOUT = 12V at 4A @ 2MHz

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Product Details

Demonstration circuit 2598A is a 60V 2MHz synchronous buck-boost controller featuring the LT8390A. It accepts an input voltage from 4V to 24V (with transient to 60V) and regulates 12V output at up to 4A. DC2598A features high efficiency and 2MHz switching frequency, a high speed for a 4-switch buck-boost controller. It has a PGOOD flag, short-circuit fault protection, ISMON current-monitoring output signal, and spread spectrum frequency modulation (SSFM) or frequency synchronization.

eval board
schematic 5
schematic 6
schematic 7
EVAL-LT8390A-AZ

60V High-Frequency Synchronous GaN Buck-Boost Controller

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Product Details

The evaluation circuit EVAL-LT8390A-AZ is a synchronous 4-switch buck-boost controller featuring the LT8390A and 4 EPC GaN FETs. This circuit outputs 24V and maintains tight regulation with up to 5A load current and over an input voltage from 8V to 60V. 2MHz switching frequency provides a small footprint using a single 6mm x 6mm x 6mm inductor while maintaining high efficiency.

The LT8390A features a 5V gate driver that is used to safely drive GaNFETs. Additionally, the EVAL-LT8390A-AZ board features external clamping circuitry around the bootstrap capacitors to guarantee that the gate drive of the top FETs is driven under the absolute maximum gate-to-source voltage of the GaNFET. Additionally, Schottky diodes are placed anti-parallel to the synchronous GaNFETs to help with reverse conduction during the LT8390A’s 25ns dead time.

The LT8390A has a wide input voltage range from 4V to 60V. It can regulate an output as a boost, a buck, or a 4-switch boost-buck controller. It has an adjustableswitching frequency between 600kHz and 2MHz. It has anoption for external frequency synchronization or spreadspectrum frequency modulation. Its high switchingfrequency is unique to buck-boost controller ICs. Becauseof this, it can be used for high power when the input maybe above, below, or equal to the output.

The LT8390A data sheet gives a complete description of the part, operation, and applications information. The data sheet must be read in conjunction with this user guide. The LT8390AJUFD is assembled in a 28-lead 4mm x 5mm plastic QFN package with a thermally enhanced ground pad. LT8390A is also available in a 28-Lead plastic TSSOP (FE) package. Proper board layout is essential for maximum thermal performance. Refer to the data sheet PC Board Layout Checklist section for more details.

Design files for this circuit board are available at Product Evaluation Boards and Kits | Design Center | Analog Devices.
DC2598A
LT8390A Demo Board | VIN = 4V to 24V, (60V Transient) with VOUT = 12V at 4A @ 2MHz
DC2598A Evaluation Board DC2598A Evaluation Board - Top View DC2598A Evaluation Board - Bottom View DC2598A_UG-1318 Image
EVAL-LT8390A-AZ
60V High-Frequency Synchronous GaN Buck-Boost Controller
EVAL-LT8390A-AZ Board Photo Angle View EVAL-LT8390A-AZ Board Photo Top View EVAL-LT8390A-AZ Board Photo Bottom View

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