LT8390 - 60V Synchronous 4-Switch Buck-Boost Controller with Spread Spectrum
Datasheet Documentation
LT Journal
Press Release


Typical Application

LT8390 Typical Application
LT8390 Typical Application


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.

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

4x5 QFN-28,TSSOP-28

LT8390 Package Drawing
LT8390 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
LT8390EUFD#PBF QFN 28 E $6.64 $4.65
LT8390EFE#PBF TSSOP 28 E $6.64 $4.65
LT8390IUFD#PBF QFN 28 I $7.31 $5.12
LT8390EFE#TRPBF TSSOP 28 E $6.70 $4.71
LT8390IFE#PBF TSSOP 28 I $7.31 $5.12
LT8390IFE#TRPBF TSSOP 28 I $7.37 $5.18
LT8390EUFD#TRPBF QFN 28 E $6.70 $4.71
LT8390IUFD#TRPBF QFN 28 I $7.37 $5.18
LT8390AEUFD#TRPBF QFN 28 E $6.70 $4.71
LT8390AIUFD#PBF QFN 28 I $7.31 $5.12
LT8390AIUFD#TRPBF QFN 28 I $7.37 $5.18
LT8390AEUFD#PBF QFN 28 E $6.64 $4.65
LT8390AEFE#PBF TSSOP 28 E $6.64 $4.65
LT8390AEFE#TRPBF TSSOP 28 E $6.70 $4.71
LT8390AIFE#TRPBF TSSOP 28 I $7.37 $5.18
LT8390AIFE#PBF TSSOP 28 I $7.31 $5.12
LT8390AHFE#PBF TSSOP 28 H $7.67 $5.37
LT8390AHFE#TRPBF TSSOP 28 H $7.73 $5.43
LT8390HUFD#TRPBF QFN 28 H $7.73 $5.43
LT8390HFE#TRPBF TSSOP 28 H $7.73 $5.43
LT8390HUFD#PBF QFN 28 H $7.67 $5.37
LT8390AHUFD#TRPBF QFN 28 H $7.73 $5.43
LT8390AHUFD#PBF QFN 28 H $7.67 $5.37
LT8390HFE#PBF TSSOP 28 H $7.67 $5.37
* 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
DC2457A LT8390 Demo Board | Sync Buck-Boost Controller, 4V ≤ VIN ≤ 60V, VOUT = 12V @ 4A (Fsw=400kHz) $250.00