LT8390A
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LT8390A

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 26
1ku List Price Starting From $5.48
Features
  • 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
Additional Details
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The LT8390A is a synchronous 4-switch buck-boost DC/DC controller that regulates output voltage, input or output current from an input voltage above, below, or equal to the output voltage. The proprietary peak-buck peak-boost current mode control scheme allows adjustable and synchronizable 600kHz to 2MHz fixed frequency operation, or internal 25% triangle spread spectrum frequency modulation for low EMI. With a 4V to 60V input voltage range, 0V to 60V output voltage capability, and seamless low-noise transitions between operation regions, the LT8390A is ideal for voltage regulator, battery and supercapacitor charger applications in automotive, industrial, telecom, and even battery-powered systems.

The LT8390A provides input or output current monitor and power good flag. Fault protection is also provided to detect output short-circuit condition, during which the LT8390A retries, latches off, or keeps running.

 


Max Switching Frequency Max Output Power
LT8390 650kHz 450W+
LT8390A 2MHz 50W+


APPLICATIONS

  • Automotive, Industrial, Telecom Systems
  • High Frequency Battery-Powered System
Part Models 26
1ku List Price Starting From $5.48

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Documentation

Documentation

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC2598A

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

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DC2598A

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

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

Product Detail

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.

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EVAL-LT8390A-AZ

60V High-Frequency Synchronous GaN Buck-Boost Controller

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EVAL-LT8390A-AZ

60V High-Frequency Synchronous GaN Buck-Boost Controller

60V High-Frequency Synchronous GaN Buck-Boost Controller

Product Detail

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.

Tools & Simulations

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.

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