LTC7103

RECOMMENDED FOR NEW DESIGNS

105V, 2.3A Low EMI Synchronous Step-Down Regulator with PassThru

Data Sheet (Rev. C) Product Selection Table

Part Models: 8
1ku List Price: Starting From $5.37

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Overview

Wide V_IN Range: 4.4V to 105V (110V Abs Max)
Ultralow EMI/EMC Emissions: CISPR 25 Compliant
2µA I_Q When Regulating 48V_IN to 3.3V_OUT
Fast and Accurate Output Current Programming and Monitoring with No External R_SENSE
Brick Wall Current Limit
Low Minimum On-Time: 40ns
Wide V_OUT Range: 1V to V_IN
100% Maximum Duty Cycle Operation
Programmable Fixed Frequency: 200kHz to 2MHz

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 External Clock
EXTV_CC LDO Powers Chip from V_OUT = 3.3V to 40V
OPTI-LOOP^® or Fixed Internal Compensation
Input and Output Overvoltage Protection
Thermally Enhanced (5mm × 6mm) QFN Package

The LTC7103 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 V_IN while delivering up to 2.3A of output current.

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

The 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.

Applications

Battery Chargers and CC/CV Supplies
Automotive and Military Systems
Industrial, Avionics and Heavy Equipment
Medical Instruments and Telecommunication Systems

Part Models: 8
1ku List Price: Starting From $5.37

Documentation

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC7103EUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103EUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103HUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103HUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103IUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103IUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103MPUHE#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC7103MPUHE#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jul 31, 2025 - 25_0136 LTC7103 and LTC7103-1 New Die Revision
		PCN25_0136_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC7103EUHE#PBF	PRODUCTION
LTC7103EUHE#TRPBF	PRODUCTION
LTC7103HUHE#PBF	PRODUCTION
LTC7103HUHE#TRPBF	PRODUCTION
LTC7103IUHE#PBF	PRODUCTION
LTC7103IUHE#TRPBF	PRODUCTION
LTC7103MPUHE#PBF	PRODUCTION
LTC7103MPUHE#TRPBF	PRODUCTION
Mar 18, 2020 - 20_0155 LTC7103 Die Revision
		PCN20_0155_Form Material_Report Qualification Results Summary
LTC7103EUHE#PBF	PRODUCTION
LTC7103EUHE#TRPBF	PRODUCTION
LTC7103HUHE#PBF	PRODUCTION
LTC7103HUHE#TRPBF	PRODUCTION
LTC7103IUHE#PBF	PRODUCTION
LTC7103IUHE#TRPBF	PRODUCTION
LTC7103MPUHE#PBF	PRODUCTION
LTC7103MPUHE#TRPBF	PRODUCTION
Apr 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC7103HUHE#PBF	PRODUCTION
LTC7103HUHE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 2
LTC4380	RECOMMENDED FOR NEW DESIGNS	Low Quiescent Current Surge Stopper
LTC4366	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper

Tools & Simulations

LTspice 1

LTC7103 Demo Circuit - High Efficiency, Low EMI Step-Down Regulator (5-100V to 5V @ 2.3A)

Models for the following parts are available in LTspice:

LTC7103
LTC7103-1

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.

Evaluation Kits

LTC7103 Demo Board | VIN = 5V to 100V with VOUT = 5V at 2.3A @ 400kHz

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Product Details

Demonstration circuit 2317A is a 100V monolithic DC/ DC step-down regulator featuring the LTC7103. The demo board is designed for a 5V/2.3A output from a 5V to 100V input at 400kHz switching frequency. The wide input range makes it suitable for automotive, industrial, medical instrument, and telecom applications. This buck regulator has a peak efficiency of 93.5% at 12V_IN, 88.3% at 48V_IN and 81.5% at 100V_IN.