LTC3630 - High Efficiency, 65V 500mA Synchronous Step-Down Converter


  • Wide Operating Input Voltage Range: 4V to 65V
  • Synchronous Operation for Highest Efficiency
  • Internal High Side and Low Side Power MOSFETs
  • No Compensation Required
  • Adjustable 50mA to 500mA 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 and External Soft-Start
  • Programmable 1.8V, 3.3V, 5V or Adjustable Output
  • Few External Components Required
  • Low Profile (0.75mm) 3mm × 5mm DFN and Thermally-Enhanced MSE16 Packages

Typical Application

LTC3630 Typical Application
LTC3630 Typical Application


The LTC®3630 is a high efficiency step-down DC/DC converter 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 LTC3630 can supply up to 500mA 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 LTC3630’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 65V, the LTC3630 is a robust converter suited for regulating a wide variety of power sources. Additionally, the LTC3630 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC3630s to be paralleled in higher current applications.

The LTC3630 is available in the thermally-enhanced 3mm × 5mm DFN and the MSE16 packages.

  Vin Range
LTC3630 4.5V to 65V
LTC3630A 4.5V to 76V


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
LTC3630EDHC#PBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3630EDHC#TRPBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3630EMSE#PBF MS-16E MSE E 05-08-1871 Yes
LTC3630EMSE#TRPBF MS-16E MSE E 05-08-1871 Yes
LTC3630HDHC#PBF 5x3 DFN-16 DHC H 05-08-1706 Yes
LTC3630HDHC#TRPBF 5x3 DFN-16 DHC H 05-08-1706 Yes
LTC3630HMSE#PBF MS-16E MSE H 05-08-1871 Yes
LTC3630HMSE#TRPBF MS-16E MSE H 05-08-1871 Yes
LTC3630IDHC#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3630IDHC#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3630IMSE#PBF MS-16E MSE I 05-08-1871 Yes
LTC3630IMSE#TRPBF MS-16E MSE I 05-08-1871 Yes
LTC3630MPDHC#PBF 5x3 DFN-16 DHC MP 05-08-1706 Yes
LTC3630MPDHC#TRPBF 5x3 DFN-16 DHC MP 05-08-1706 Yes
LTC3630MPMSE#PBF MS-16E MSE MP 05-08-1871 Yes
LTC3630MPMSE#TRPBF MS-16E MSE MP 05-08-1871 Yes

LTC3630 Package Drawing
LTC3630 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
LTC3630EDHC#PBF 5x3 DFN-16 E $4.57 $3.20 Yes
LTC3630EDHC#TRPBF 5x3 DFN-16 E $3.26 Yes
LTC3630EMSE#PBF MS-16E E $4.57 $3.20 Yes
LTC3630EMSE#TRPBF MS-16E E $3.26 Yes
LTC3630HDHC#PBF 5x3 DFN-16 H $5.43 $3.80 Yes
LTC3630HDHC#TRPBF 5x3 DFN-16 H $3.86 Yes
LTC3630HMSE#PBF MS-16E H $5.43 $3.80 Yes
LTC3630HMSE#TRPBF MS-16E H $3.86 Yes
LTC3630IDHC#PBF 5x3 DFN-16 I $5.07 $3.55 Yes
LTC3630IDHC#TRPBF 5x3 DFN-16 I $3.61 Yes
LTC3630IMSE#PBF MS-16E I $5.07 $3.55 Yes
LTC3630IMSE#TRPBF MS-16E I $3.61 Yes
LTC3630MPDHC#PBF 5x3 DFN-16 MP $15.31 $10.72 Yes
LTC3630MPDHC#TRPBF 5x3 DFN-16 MP $10.78 Yes
LTC3630MPMSE#PBF MS-16E MP $15.31 $10.72 Yes
LTC3630MPMSE#TRPBF MS-16E MP $10.78 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
DC2105A-B LTC3630EMSE Demo Board | 4V ≤ VIN ≤ 65V, Vout = 1.8V/3.3V/5V/Adj @ 500mA Contact Factory
Buy Now
Click here to view our complete list of demo boards


  • 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 with questions and comments.

Design Tools


LTspice® software 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

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

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

Models for the following parts are available in LTspice:

Technical Support