Analog Devices Inc. LTC7103 Low EMI Synchronous Step-Down Regulator

Analog Devices LTC7103 Low EMI Synchronous Step-Down Regulator is a high efficiency, monolithic synchronous step-down DC-DC converter utilizing a constant frequency, average current mode control architecture. It operates from an input voltage range of 4.4V to 105V and provides an adjustable regulated output voltage from 1V to VIN while delivering up to 2.3A of output current.

The LTC7103 features high-frequency operation and a low minimum on-time that reduces inductor size and enables constant-frequency operation even at very high step-down ratios. Also, the LTC7103 achieves the lowest possible dropout voltage with 100% maximum duty cycle operation. During a light load operation, converter efficiency and output ripple can be optimized by selecting Burst Mode or pulse-skipping operation.

The Analog Devices LTC7103 includes accurate, high-speed average current programming and monitoring without the need for an external sense resistor. Additional features include a bypass LDO to maximize efficiency, fixed or adjustable output voltage and loop compensation, and a wide array of protection features to enhance reliability.


  • 4.4V to 105V (110V Abs Max) wide VIN range
  • Ultra-low EMI/EMC emissions (CISPR 25 compliant)
  • 2µA IQ when regulating 48VIN to 3.3VOUT
  • Fast and accurate output current programming and monitoring with no external RSENSE
  • Brick wall current limit
  • 40ns low minimum on-time
  • 1V to VIN wide VOUT range
  • 100% maximum duty cycle operation
  • 200kHz to 2MHz programmable fixed frequency
  • Eight, pin-selectable fixed (1.2V to 15V) or adjustable output voltages
  • Selectable pulse-skipping or low ripple Burst Mode® operation at light loads
  • PLL synchronization to an external clock
  • EXTVCC LDO powers chip from VOUT = 3.3V to 40V
  • OPTI-LOOP® or fixed internal compensation
  • Input and output overvoltage protection
  • 5mm × 6mm thermally enhanced QFN36 package


  • Battery chargers and CC/CV supplies
  • Automotive and military systems
  • Industrial, avionics, and heavy equipment
  • Medical instruments and telecommunication systems

Typical Application

Application Circuit Diagram - Analog Devices Inc. LTC7103 Low EMI Synchronous Step-Down Regulator
Published: 2021-03-02 | Updated: 2022-03-11