1. Products
  2. Power Management
  3. Switching Regulators
  4. Step-Up (Boost) Regulators
  5. External Power Switch Boost Controllers
  6. LTC3897-2


Features and Benefits

  • Input Supply Range: 4.5V to 65V (Up to 75V Surge)
  • Reverse Input Protection to –40V
  • Inrush 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
  • 5mm × 9mm QFN-44 Package with High Voltage Pin Spacing

Product Details

The LTC3897-2 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 inrush 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 differences between the LTC3897-2 and LTC3897 are shown in Table 1.


  • Industrial
  • Automotive
  • Military/Avionics
  • Telecommunications

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Tools & Simulations


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.


Models for the following parts are available in LTspice:


Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC3897EUHG-2#PBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
LTC3897EUHG-2#TRPBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
LTC3897HUHG-2#PBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
LTC3897HUHG-2#TRPBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
LTC3897IUHG-2#PBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
LTC3897IUHG-2#TRPBF Material Declaration Reliability Data 44(38)-Lead Plastic QFN (5mm × 8mm)
Wafer Fabrication Data R526 Reliability Data

Sample & Buy

Ordering FAQs

See our Ordering FAQs for answers to questions about online orders, payment options and more.


Buy Now Pricing

(**) Displayed Buy Now Price and Price Range is based on small quantity orders.


List Pricing

(*)The 1Ku 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 Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.

Price Table Help