LTC3636/LTC3636-1 - Dual Channel 6A, 20V Monolithic Synchronous Step-Down Regulator


  • Wide VIN Range: 3.1V to 20V
  • Wide VOUT Range:

0.6V to 5V (LTC3636)
1.8V to 12V (LTC3636-1)

  • Output Current per Channel: 6A
  • High Efficiency: Up to 95%
  • Die Temperature Monitor
  • Adjustable Switching Frequency: 500kHz to 4MHz
  • External Frequency Synchronization
  • Current Mode Operation for Excellent Line and Load Transient Response
  • 0.6V Reference Allows Low Output Voltages
  • User Selectable Burst Mode® Operation or Forced Continuous Operation
  • Output Voltage Tracking and Soft-Start Capability
  • Short-Circuit Protected
  • Overvoltage Input and Overtemperature Protection
  • Power Good Status Outputs
  • Low Profile 4mm × 5mm 28-Lead QFN Package

Typical Application

LTC3636 Typical Application
LTC3636 Typical Application


The LTC®3636/LTC3636-1 is a high efficiency, dual-channel monolithic synchronous buck regulator using a controlled on-time current mode architecture, with phase lockable switching frequency. The operating supply voltage range is from 3.1V to 20V, making it suitable for lithium-ion battery stacks as well as point of load power supply applications from a 12V or 5V input.

The operating frequency is programmable from 500kHz to 4MHz with an external resistor and may be synchronized to an external clock signal. The high frequency capability allows the use of small surface mount inductors and capacitors. The unique constant frequency/controlled on-time architecture is ideal for high step-down ratio applications that operate at high frequency while demanding fast transient response.

The LTC3636/LTC3636-1 can select between forced continuous mode and high efficiency Burst Mode operation. The LTC3636 and LTC3636-1 differ in their output voltage sense range.


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

Part Number Package Code Temp Package
LTC3636EUFD-1#PBF 4x5 QFN-28 UFD E 05-08-1538 Yes
LTC3636EUFD-1#TRPBF 4x5 QFN-28 UFD E 05-08-1538 Yes
LTC3636EUFD#PBF 4x5 QFN-28 UFD E 05-08-1538 Yes
LTC3636EUFD#TRPBF 4x5 QFN-28 UFD E 05-08-1538 Yes
LTC3636IUFD-1#PBF 4x5 QFN-28 UFD I 05-08-1538 Yes
LTC3636IUFD-1#TRPBF 4x5 QFN-28 UFD I 05-08-1538 Yes
LTC3636IUFD#PBF 4x5 QFN-28 UFD I 05-08-1538 Yes
LTC3636IUFD#TRPBF 4x5 QFN-28 UFD I 05-08-1538 Yes

LTC3636 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
LTC3636EUFD-1#PBF 4x5 QFN-28 E $6.36 $4.45 Yes
LTC3636EUFD-1#TRPBF 4x5 QFN-28 E $6.42 $4.51 Yes
LTC3636EUFD#PBF 4x5 QFN-28 E $6.36 $4.45 Yes
LTC3636EUFD#TRPBF 4x5 QFN-28 E $6.42 $4.51 Yes
LTC3636IUFD-1#PBF 4x5 QFN-28 I $6.93 $4.85 Yes
LTC3636IUFD-1#TRPBF 4x5 QFN-28 I $6.99 $4.91 Yes
LTC3636IUFD#PBF 4x5 QFN-28 I $6.93 $4.85 Yes
LTC3636IUFD#TRPBF 4x5 QFN-28 I $6.99 $4.91 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
DC2335A LTC3636EUFD Demo Board | 3.1V to 20V Input with Vout1 range of 3.1V to 20V up to 6A & Vout2 range of 5V to 20V up to 6A $409.00
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Click here to view our complete list of demo boards


  • Distributed Power Systems
  • Battery Powered Instruments
  • Point of Load Power Supplies

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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

Models for the following parts are available in LTspice:


The LTpowerCAD design tool is a complete power supply design tool program that can significantly ease the tasks of power supply design. It guides users to a solution, selects power stage components, provides detailed power efficiency, shows quick loop bode plot stability and load transient analysis, and can export a final design to LTspice for simulation. Click here to download LTpowerCAD

Design tools for the following parts are available in LTpowerCAD:
LTC3636 Parallel

Technical Support