LTC3736-2 - Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking


  • No Current Sense Resistors Required
  • Out-of-Phase Controllers Reduce Required Input Capacitance
  • Tracking Function
  • Wide VIN Range: 2.75V to 9.8V
  • 0.6V ±1% Voltage Reference
  • High Current Limit
  • Constant Frequency Current Mode Operation
  • Low Dropout Operation: 100% Duty Cycle
  • True PLL for Frequency Locking or Adjustment
  • Selectable Pulse Skipping/Forced Continuous Operation
  • Auxiliary Winding Regulation
  • Internal Soft-Start Circuitry
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Micropower Shutdown: IQ = 9μA
  • Tiny Low Profile (4mm × 4mm) QFN and narrow SSOP packages.

Typical Application

LTC3736-2 Typical Application
LTC3736-2 Typical Application


The LTC®3736-2 is a 2-phase dual synchronous step-down switching regulator controller with tracking that drives external complementary power MOSFETs using few external components. The constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors and improves efficiency. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two controllers out of phase.

Pulse skipping operation provides high efficiency at light loads. 100% duty cycle capability provides low dropout operation, extending operating time in battery-powered systems.

The switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz. An internal soft-start, which can be lengthened externally, smoothly ramps the output voltage during start-up.

The LTC3736-2 is available in the tiny thermally enhanced (4mm × 4mm) QFN and 24-lead narrow SSOP packages.

  Max Current Sense Voltage Burst Mode
Soft Start Spread Spectrum
LTC3736 204mV Yes No No
LTC3736-1 204mV No No Yes
LTC3736-2 345mV No Yes No


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
LTC3736EGN-2#PBF SSOP-24 GN E 05-08-1641 (GN24) Yes
LTC3736EGN-2#TRPBF SSOP-24 GN E 05-08-1641 (GN24) Yes
LTC3736EUF-2#PBF 4x4 QFN-24 UF E 05-08-1697 Yes
LTC3736EUF-2#TRPBF 4x4 QFN-24 UF E 05-08-1697 Yes

LTC3736-2 Package Drawing
LTC3736-2 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
LTC3736EGN-2#PBF SSOP-24 E $5.45 $3.80 Yes
LTC3736EGN-2#TRPBF SSOP-24 E $3.86 Yes
LTC3736EUF-2#PBF 4x4 QFN-24 E $5.63 $3.90 Yes
LTC3736EUF-2#TRPBF 4x4 QFN-24 E $4.00 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
DC922A LTC3736EUF-2 Demo Board | 2-Phase, 2.7V ≤ VIN ≤ 8V, Vout1 = 2.5V @ 5A, Vout2 = 1.8V @ 5A Contact Factory
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Click here to view our complete list of demo boards


  • One or Two Lithium-Ion Powered Devices
  • Notebook and Palmtop Computers, PDAs
  • Portable Instruments
  • Distributed DC Power Systems

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