LTC3639 - High Efficiency, 150V 100mA Synchronous Step-Down Regulator

Features

  • Wide Operating Input Voltage Range: 4V to 150V
  • Synchronous Operation for Highest Efficiency
  • Internal High Side and Low Side Power MOSFETs
  • No Compensation Required
  • Adjustable 10mA to 100mA Maximum Output Current
  • Low Dropout Operation: 100% Duty Cycle
  • Low Quiescent Current: 12μA
  • Wide Output Range: 0.8V to VIN
  • 0.8V ±1% Feedback Voltage Reference
  • Precise RUN Pin Threshold
  • Internal or External Soft-Start
  • Programmable 1.8V, 3.3V, 5V or Adjustable Output
  • Few External Components Required
  • Programmable Input Overvoltage Lockout
  • Thermally Enhanced High Voltage MSOP Package
Designed for Automotive and Transportation Applications
AEC-Q100 data available for specific packages


Typical Application

LTC3639 Typical Application
LTC3639 Typical Application

Description

The LTC®3639 is a high efficiency step-down DC/DC regulator with internal high side and synchronous power switches that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load.

The LTC3639 can supply up to 100mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC3639’s combination of Burst Mode® operation, integrated power switches, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents.

With its wide input range of 4V to 150V and programmable overvoltage lockout, the LTC3639 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3639 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment.

The LTC3639 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins.

Packaging

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

Part Number Package Code Temp Package
Drawing
RoHS
LTC3639EMSE#PBF MS-16E MSE E 05-08-1871 Yes
LTC3639EMSE#TRPBF MS-16E MSE E 05-08-1871 Yes
LTC3639HMSE#PBF MS-16E MSE H 05-08-1871 Yes
LTC3639HMSE#TRPBF MS-16E MSE H 05-08-1871 Yes
LTC3639IMSE#PBF MS-16E MSE I 05-08-1871 Yes
LTC3639IMSE#TRPBF MS-16E MSE I 05-08-1871 Yes
LTC3639MPMSE#PBF MS-16E MSE MP 05-08-1871 Yes
LTC3639MPMSE#TRPBF MS-16E MSE MP 05-08-1871 Yes


LTC3639 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
(1-99)
Price
(1k)*
RoHS
LTC3639EMSE#PBF MS-16E E $5.22 $3.65 Yes
LTC3639EMSE#TRPBF MS-16E E $3.71 Yes
LTC3639HMSE#PBF MS-16E H $6.10 $4.27 Yes
LTC3639HMSE#TRPBF MS-16E H $4.33 Yes
LTC3639IMSE#PBF MS-16E I $5.74 $4.02 Yes
LTC3639IMSE#TRPBF MS-16E I $4.08 Yes
LTC3639MPMSE#PBF MS-16E MP $15.49 $10.84 Yes
LTC3639MPMSE#TRPBF MS-16E MP $10.90 Yes
Buy NowRequest Samples
* 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
DC1901A LTC3639EMSE Demo Board | Sync Buck, 4V ≤ VIN ≤ 150V, Vout = 1.8V/3.3V/5V/Adj @ 100mA $200.00
Buy Now
Click here to view our complete list of demo boards

Designed for Automotive and Transportation Applications

AEC-Q100 data is available for these specific part numbers. Please contact your local sales representative for more information regarding reliability reports or to inquire about parts that are not included. For more information, view our Automotive and Transportation page

Part Number Package Temp Price
(1-99)
Price
(1k)*
RoHS
LTC3639HMSE#PBF MS-16E H $6.10 $4.27 Yes
LTC3639HMSE#TRPBF MS-16E H $4.33 Yes
LTC3639IMSE#PBF MS-16E I $5.74 $4.02 Yes
LTC3639IMSE#TRPBF MS-16E I $4.08 Yes
LTC3639MPMSE#PBF MS-16E MP $15.49 $10.84 Yes
LTC3639MPMSE#TRPBF MS-16E MP $10.90 Yes
Buy NowRequest Samples
* 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.

Applications

  • Industrial Control Supplies
  • Medical Devices
  • Distributed Power Systems
  • Portable Instruments
  • Battery-Operated Devices
  • Automotive
  • Avionics

Product Notifications

Please login to your MyLinear account for notifications of datasheet updates, new document releases and LTspice model announcements for your favorite products. If you do not have a MyLinear account you may Sign Up Now.

Forgot your password? Click here.
Need help? Email mylinear@linear.com with questions and comments.

Design Tools

LTspiceIV

LTspice® IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice IV

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Models for the following parts are available in LTspice IV:
LTC3639

Technical Support