LTC3897 - PolyPhase™ Synchronous Boost Controller with Input/ Output Protection


  • Input Supply Range: 4.5V to 65V (Up to 75V Surge)
  • Reverse Input Protection to –40V
  • In-Rush Current Control, Overcurrent Protection and Output Disconnect for Boost Converter
  • Input Voltage Surge Protection with Adjustable Clamp Voltage
  • Onboard Ideal Diode Controller
  • Low Quiescent Current: 55μA
  • 2-Phase Operation Reduces Required Input and Output Capacitance and Noise
  • Output Voltage Up to 60V
  • Adjustable Gate Drive Level 5V to 10V (OPTI-DRIVE) for Logic-Level or Standard Threshold FETs
  • No External Bootstrap Diodes Required

Typical Application

LTC3897 Typical Application
LTC3897 Typical Application


The LTC®3897 is a synchronous boost DC/DC controller with surge stopper and ideal diode controller.

The boost controller drives two N-channel power MOSFET stages out-of-phase to reduce input and output capacitor requirements, allowing the use of smaller inductors than the single-phase equivalent. Synchronous rectification reduces power loss and eases thermal requirements.

The surge stopper controls the gate of an external N-channel MOSFET to protect against high voltage input transients and provides in-rush current control, overcurrent protection and output disconnect for the boost converter. The integrated ideal diode controller drives another N-channel MOSFET to replace a Schottky diode for reverse input protection and voltage holdup or peak detection. It controls the forward voltage drop across the MOSFET and minimizes reverse current flow.

The LTC3897 is available in thermally-enhanced 38-pin leadless QFN or 38-lead TSSOP packages.


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

Part Number Package Code Temp Package
LTC3897EFE#PBF TSSOP-38 FE E 05-08-1772 Yes
LTC3897EFE#TRPBF TSSOP-38 FE E 05-08-1772 Yes
LTC3897EUHF#PBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3897EUHF#TRPBF 5x7 QFN-38 UHF E 05-08-1701 Yes
LTC3897HFE#PBF TSSOP-38 FE H 05-08-1772 Yes
LTC3897HFE#TRPBF TSSOP-38 FE H 05-08-1772 Yes
LTC3897HUHF#PBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3897HUHF#TRPBF 5x7 QFN-38 UHF H 05-08-1701 Yes
LTC3897IFE#PBF TSSOP-38 FE I 05-08-1772 Yes
LTC3897IFE#TRPBF TSSOP-38 FE I 05-08-1772 Yes
LTC3897IUHF#PBF 5x7 QFN-38 UHF I 05-08-1701 Yes
LTC3897IUHF#TRPBF 5x7 QFN-38 UHF I 05-08-1701 Yes

LTC3897 Package Drawing
LTC3897 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
LTC3897EFE#PBF TSSOP-38 E $7.86 $5.50 Yes
LTC3897EFE#TRPBF TSSOP-38 E $7.92 $5.56 Yes
LTC3897EUHF#PBF 5x7 QFN-38 E $7.86 $5.50 Yes
LTC3897EUHF#TRPBF 5x7 QFN-38 E $7.92 $5.56 Yes
LTC3897HFE#PBF TSSOP-38 H $9.36 $6.55 Yes
LTC3897HFE#TRPBF TSSOP-38 H $9.42 $6.61 Yes
LTC3897HUHF#PBF 5x7 QFN-38 H $9.36 $6.55 Yes
LTC3897HUHF#TRPBF 5x7 QFN-38 H $9.42 $6.61 Yes
LTC3897IFE#PBF TSSOP-38 I $8.86 $6.20 Yes
LTC3897IFE#TRPBF TSSOP-38 I $8.92 $6.26 Yes
LTC3897IUHF#PBF 5x7 QFN-38 I $8.86 $6.20 Yes
LTC3897IUHF#TRPBF 5x7 QFN-38 I $8.92 $6.26 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
DC2108A LTC3897 Demo Board | Sync Boost Controller, 16V ≤ VIN ≤ 55V,Vout = 48V @ 4A to 12A Contact Factory
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