Features and Benefits

  • High Voltage Operation: Up to 60V
  • Large 1Ω Gate Drivers (with 5V Supply)
  • No Current Sense Resistor Required
  • Step-Up or Step-Down DC/DC Converter
  • Dual N-Channel MOSFET Synchronous Drive
  • Excellent Line and Load Transient Response
  • Programmable Constant Frequency: 100kHz to 600kHz
  • ±1% Reference Accuracy
  • Synchronizable up to 600kHz
  • Selectable Pulse Skip Mode Operation
  • Low Shutdown Current: 25µA Typ
  • Programmable Current Limit
  • Undervoltage Lockout
  • Programmable Soft-Start
  • 16-Pin Narrow SSOP and 28-Pin SSOP Packages

Product Details

The LTC3703-5 is a synchronous step-down switching regulator controller that can directly step-down voltages from up to 60V, making it ideal for telecom and automotive applications. The LTC3703-5 drives external logic level N-channel MOSFETs using a constant frequency (up to 600kHz), voltage mode architecture.

A precise internal reference provides 1% DC accuracy. A high bandwidth error amplifier and patented* line feed forward compensation provide very fast line and load transient response. Strong 1Ω gate drivers allow the LTC3703-5 to drive multiple MOSFETs for higher current applications. The operating frequency is user programmable from 100kHz to 600kHz and can also be synchronized to an external clock for noise-sensitive applications. Current limit is programmable with an external resistor and utilizes the voltage drop across the synchronous MOSFET to eliminate the need for a current sense resistor. For applications requiring up to 100V operation, refer to the LTC3703 data sheet.


LTC3703-5 LTC3703
Maximum VIN 60V 100V
MOSFET Gate Drive  4.5V to 15V 9.3V to 15V
VCC UV+ 3.7V  8.7V
VCC UV  3.1V 6.2V


  • 48V Telecom and Base Station Power Supplies
  • Networking Equipment, Servers
  • Automotive and Industrial Control

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations


LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, 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.


Models for the following parts are available in LTspice:


Product Recommendations

LTC3703-5 Companion Parts

Recommended Related Parts

Recommended Suggested Oscillator

Reference Materials

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Support & Discussions

LTC3703-5 Discussions

RE: Can I measure branch current in the 5 different paths?
1 day(s) ago in Signal Chain Power (SCP)
RE: What designs can I make with SCP Configurator?
1 day(s) ago in Signal Chain Power (SCP) Configurator
RE: How many outputs can Configurator design at once?
1 day(s) ago in Signal Chain Power (SCP) Configurator

Sample & Buy

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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 Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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