LT8570 - Boost/SEPIC/Inverting DC/DC Converter with 65V Switch, Soft-Start and Synchronization


  • 65V Power Switch
  • Current Limit Options of 0.5A (LT8570) or 0.25A (LT8570-1)
  • Adjustable Switching Frequency
  • Single Feedback Resistor Sets VOUT
  • Synchronizable to External Clock
  • High Gain SHDN Pin Accepts Slowly Varying Input Signals
  • Wide Input Voltage Range: 2.55V to 40V
  • Low VCESAT Switch
  • Integrated Soft-Start Function
  • Easily Configurable as a Boost, SEPIC, or Inverting Converter
  • User Configurable Undervoltage Lockout (UVLO)
  • Pin Compatible with LT3580 and LT8580
  • Tiny Thermally Enhanced 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages

Typical Application

LT8570 Typical Application
LT8570 Typical Application


The LT®8570 and LT8570-1 are PWM DC/DC converters. The LT8570 contains a 0.5A, 65V power switch, while the LT8570-1 contains a 0.25A, 65V power switch. The LT8570 and LT8570-1 can be configured as either a boost, SEPIC or inverting converter.

The LT8570/LT8570-1 have an adjustable oscillator, set by a resistor from the RT pin to ground. Additionally, the LT8570/LT8570-1 can be synchronized to an external clock. The switching frequency of the part may be free running or synchronized, and can be set between 200kHz and 1.5MHz.

The LT8570/LT8570-1 also feature innovative SHDN pin circuitry that allows for slowly varying input signals and an adjustable undervoltage lockout function.

Additional features such as frequency foldback and softstart are integrated. The LT8570/LT8570-1 are available in tiny thermally enhanced 3mm × 3mm 8-lead DFN and 8-lead MSOP packages.


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
LT8570EDD-1#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT8570EDD-1#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT8570EDD#PBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT8570EDD#TRPBF 3x3 DFN-8 DD E 05-08-1698 Yes
LT8570EMS8E-1#PBF MS-8 MS8 E 05-08-1660 Yes
LT8570EMS8E-1#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT8570EMS8E#PBF MS-8 MS8 E 05-08-1660 Yes
LT8570EMS8E#TRPBF MS-8 MS8 E 05-08-1660 Yes
LT8570IDD-1#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT8570IDD-1#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT8570IDD#PBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT8570IDD#TRPBF 3x3 DFN-8 DD I 05-08-1698 Yes
LT8570IMS8E-1#PBF MS-8 MS8 I 05-08-1660 Yes
LT8570IMS8E-1#TRPBF MS-8 MS8 I 05-08-1660 Yes
LT8570IMS8E#PBF MS-8 MS8 I 05-08-1660 Yes
LT8570IMS8E#TRPBF MS-8 MS8 I 05-08-1660 Yes

LT8570 Package Drawing
LT8570 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
LT8570EDD-1#PBF 3x3 DFN-8 E $3.22 $2.25 Yes
LT8570EDD-1#TRPBF 3x3 DFN-8 E $2.31 Yes
LT8570EDD#PBF 3x3 DFN-8 E $3.22 $2.25 Yes
LT8570EDD#TRPBF 3x3 DFN-8 E $2.31 Yes
LT8570EMS8E-1#PBF MS-8 E $3.22 $2.25 Yes
LT8570EMS8E-1#TRPBF MS-8 E $2.31 Yes
LT8570EMS8E#PBF MS-8 E $3.22 $2.25 Yes
LT8570EMS8E#TRPBF MS-8 E $2.31 Yes
LT8570IDD-1#PBF 3x3 DFN-8 I $3.54 $2.48 Yes
LT8570IDD-1#TRPBF 3x3 DFN-8 I $2.54 Yes
LT8570IDD#PBF 3x3 DFN-8 I $3.54 $2.48 Yes
LT8570IDD#TRPBF 3x3 DFN-8 I $2.54 Yes
LT8570IMS8E-1#PBF MS-8 I $3.54 $2.48 Yes
LT8570IMS8E-1#TRPBF MS-8 I $2.54 Yes
LT8570IMS8E#PBF MS-8 I $3.54 $2.48 Yes
LT8570IMS8E#TRPBF MS-8 I $2.54 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
DC2297A-A LT8570EDD Demo Board | Boost, 65V Power Switch, 5V ≤ VIN ≤ 10V, Vout = 12V @ 125mA $100.00
DC2297A-B LT8570EDD-1 Demo Board | Boost, 5V ≤ VIN ≤ 10V, Vout = 12V @ 60mA $100.00
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