LT3697 - USB 5V, 2.5A Output, 35V Input Buck with Cable Drop Compensation


  • Accurate 5V Output
  • Programmable Cable Drop Compensation
  • Programmable Output Current Limit
  • Adjustable Output from 5.0V to 6.1V
  • Dual Input Feedback Permits Regulation on Output of USB Switch
  • Active Load Reduces Output Overshoot
  • FLT Flag Indicates Overcurrent on the USB Output
  • 1.5ms FLT Flag Delay Filters Hot Plug Events
  • USB Output Current Monitor
  • Wide Input Rage: Operation from 5V to 35V
  • Withstands Input Transient to 60V
  • 2.5A Maximum Output Current
  • Survives Output Short to GND and Car Battery
  • Adjustable Switching Frequency: 300kHz to 2.2MHz
  • Synchronizable from 300kHz to 2.2MHz
  • Small, Thermally Enhanced 16-Lead MSOP Package

Typical Application

LT3697 Typical Application
LT3697 Typical Application


The LT®3697 is a 35V, 2.5A step-down switching regulator designed to power 5V USB applications. A precise output voltage and programmable cable drop compensation maintain accurate 5V regulation at the USB socket connected to the end of a long cable. The accurate, programmable current limit can eliminate the need for a USB power switch and improve system reliability. The provided 180mA active load reduces output overshoot during load transients. Dual feedback allows regulation on the output of a USB switch and limits cable drop compensation to a maximum of 6.1V output, protecting USB devices during fault conditions. A separate 5V output can be taken from the SYS terminal to power auxiliary circuitry such as a USB hub controller. The LT3697 also provides a load current monitor output and an overcurrent fault indicator.

The LT3697 operates from 300kHz to 2.2MHz and withstands input voltage transients up to 60V. The device's output survives shorts to ground and to the battery. A current mode topology is used for fast transient response and good loop stability. Shutdown reduces input supply current to less than 1μA. The LT3697 is available in a 16-lead MSOP package with an exposed pad for low thermal resistance.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

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

Part Number Package Code Temp Package
LT3697EMSE#PBF MS-16E MSE E 05-08-1667 Yes
LT3697EMSE#TRPBF MS-16E MSE E 05-08-1667 Yes
LT3697IMSE#PBF MS-16E MSE I 05-08-1667 Yes
LT3697IMSE#TRPBF MS-16E MSE I 05-08-1667 Yes

LT3697 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
LT3697EMSE#PBF MS-16E E $3.93 $2.75 Yes
LT3697EMSE#TRPBF MS-16E E $2.81 Yes
LT3697IMSE#PBF MS-16E I $4.33 $3.03 Yes
LT3697IMSE#TRPBF MS-16E I $3.09 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
DC1893A LT3697EMSE Demo Board | 8V ≤ VIN ≤ 35V; VOUT = 5V @ 2.4A $150.00
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Click here to view our complete list of demo boards


  • Automotive USB
  • Industrial USB

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