LTC3630A - High Efficiency, 76V 500mA Synchronous Step-Down Converter


  • Wide Operating Input Voltage Range: 4V to 76V
  • 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

LTC3630A Typical Application
LTC3630A Typical Application


The LTC®3630A 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 LTC3630A 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 LTC3630A’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 76V, the LTC3630A is a robust converter suited for regulating a wide variety of power sources. A feedback comparator output enables multiple LTC3630As to be paralleled in higher current applications.

The LTC3630A 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
LTC3630AEDHC#PBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3630AEDHC#TRPBF 5x3 DFN-16 DHC E 05-08-1706 Yes
LTC3630AEMSE#PBF MS-16E MSE E 05-08-1871 Yes
LTC3630AEMSE#TRPBF MS-16E MSE E 05-08-1871 Yes
LTC3630AHDHC#PBF 5x3 DFN-16 DHC H 05-08-1706 Yes
LTC3630AHDHC#TRPBF 5x3 DFN-16 DHC H 05-08-1706 Yes
LTC3630AHMSE#PBF MS-16E MSE H 05-08-1871 Yes
LTC3630AHMSE#TRPBF MS-16E MSE H 05-08-1871 Yes
LTC3630AIDHC#PBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3630AIDHC#TRPBF 5x3 DFN-16 DHC I 05-08-1706 Yes
LTC3630AIMSE#PBF MS-16E MSE I 05-08-1871 Yes
LTC3630AIMSE#TRPBF MS-16E MSE I 05-08-1871 Yes
LTC3630AMPDHC#PBF 5x3 DFN-16 DHC MP 05-08-1706 Yes
LTC3630AMPDHC#TRPBF 5x3 DFN-16 DHC MP 05-08-1706 Yes
LTC3630AMPMSE#PBF MS-16E MSE MP 05-08-1871 Yes
LTC3630AMPMSE#TRPBF MS-16E MSE MP 05-08-1871 Yes

LTC3630A Package Drawing
LTC3630A 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
LTC3630AEDHC#PBF 5x3 DFN-16 E $4.71 $3.30 Yes
LTC3630AEDHC#TRPBF 5x3 DFN-16 E $3.36 Yes
LTC3630AEMSE#PBF MS-16E E $4.71 $3.30 Yes
LTC3630AEMSE#TRPBF MS-16E E $3.36 Yes
LTC3630AHDHC#PBF 5x3 DFN-16 H $5.57 $3.90 Yes
LTC3630AHDHC#TRPBF 5x3 DFN-16 H $3.96 Yes
LTC3630AHMSE#PBF MS-16E H $5.57 $3.90 Yes
LTC3630AHMSE#TRPBF MS-16E H $3.96 Yes
LTC3630AIDHC#PBF 5x3 DFN-16 I $5.22 $3.65 Yes
LTC3630AIDHC#TRPBF 5x3 DFN-16 I $3.71 Yes
LTC3630AIMSE#PBF MS-16E I $5.22 $3.65 Yes
LTC3630AIMSE#TRPBF MS-16E I $3.71 Yes
LTC3630AMPDHC#PBF 5x3 DFN-16 MP $15.46 $10.82 Yes
LTC3630AMPDHC#TRPBF 5x3 DFN-16 MP $10.88 Yes
LTC3630AMPMSE#PBF MS-16E MP $15.46 $10.82 Yes
LTC3630AMPMSE#TRPBF MS-16E MP $10.88 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
DC1877A LTC3630AEDHC Demo Board (DFN) | Sync Buck, 4V ≤ VIN ≤ 76V, Vout = 5V/3.3V/1.8V/Adj @ 500mA Contact Factory
DC2105A-A LTC3630AEMSE Demo Board (MSOP)| 4V ≤ VIN ≤ 76V, Vout = 1.8V/3.3V/5V/Adj @ 500mA Contact Factory
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