LT8390 - 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum

Features

  • 4-Switch Single Inductor Architecture Allows VIN Above, Below or Equal to VOUT
  • Synchronous Switching: Up to 98% Efficiency
  • 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
  • Integrated Bootstrap Diodes
  • No Top MOSFET Refresh Noise in Buck or Boost
  • Adjustable and Synchronizable: 150kHz to 650kHz
  • VOUT Disconnected from VIN During Shutdown
  • Available in 28-Lead TSSOP with Exposed Pad and 28-Lead QFN (4mm × 5mm)

Typical Application

LT8390 Typical Application
LT8390 Typical Application

Description

The LT®8390 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 150kHz to 650kHz fixed frequency operation, or internal ±15% 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 LT8390 is ideal for voltage regulator, battery and supercapacitor charger applications in automotive, industrial, telecom, and even battery-powered systems.

The LT8390 provides input or output current monitor and power good flag. Fault protection is also provided to detect output short-circuit condition, during which the LT8390 retries, latches off, or keeps running.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing
RoHS
LT8390EFE#PBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT8390EFE#TRPBF TSSOP-28 FE E 05-08-1663 (EB) Yes
LT8390EUFD#PBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT8390EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1712 Yes
LT8390IFE#PBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT8390IFE#TRPBF TSSOP-28 FE I 05-08-1663 (EB) Yes
LT8390IUFD#PBF 4x5 QFN-28 UFD I 05-08-1712 Yes
LT8390IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1712 Yes


LT8390 Package Drawing
LT8390 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LT8390EFE#PBF TSSOP-28 E $6.64 $4.65 Yes
LT8390EFE#TRPBF TSSOP-28 E $6.70 $4.71 Yes
LT8390EUFD#PBF 4x5 QFN-28 E $6.64 $4.65 Yes
LT8390EUFD#TRPBF 4x5 QFN-28 E $6.70 $4.71 Yes
LT8390IFE#PBF TSSOP-28 I $7.31 $5.12 Yes
LT8390IFE#TRPBF TSSOP-28 I $7.37 $5.18 Yes
LT8390IUFD#PBF 4x5 QFN-28 I $7.31 $5.12 Yes
LT8390IUFD#TRPBF 4x5 QFN-28 I $7.37 $5.18 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC2431A LT8390EFE Demo Board | Sync Buck-Boost, 9V ≤ VIN ≤ 36V, VOUT = 12V @ 25A $313.00
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Click here to view our complete list of demo boards

Applications

  • Automotive, Industrial, Telecom Systems
  • High Power Battery-Powered System

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Design Tools

LTspice

LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice

Models for the following parts are available in LTspice IV:
LT8390

LTpowerCAD

The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LT8390

Technical Support