LTC7103-1

Name: LTC7103-1
Brand: Analog Devices
Price: 6.80 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

105V, 2.3A Low EMI Synchronous Step-Down Regulator with Fast Current Programming

Data Sheet (Rev. A) Product Selection Table

Part Models: 2
1ku List Price: Starting From $6.80

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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
PassThru^™/100% Duty Cycle Capable
Programmable Fixed Frequency: 200kHz to 2MHz

Eight, Pin-Selectable Fixed (1.2V to 15V) or Adjustable Output Voltages
Selectable Continuous, 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
AEC-Q100 Qualification in Process

Part Models: 2
1ku List Price: Starting From $6.80

Documentation

Data Sheet 1

LTC7103-1 - 105V, 2.3A Low EMI Synchronous Step-Down Regulator with Fast Current Programming Data Sheet (Rev.A) 09/17/2024

User Guide 1

DC2833A - Demo Manual (Rev.0) 01/17/2022

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
LTC7103RUHE-1#PBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC7103RUHE-1#TRPBF	36-Lead QFN (5mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliability Report 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
LTC7103RUHE-1#PBF	PRODUCTION
LTC7103RUHE-1#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice

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

LTC7103-1 | 105V, 2.3A Low EMI Synchronous Step-Down Regulator

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Product Details

Demonstration circuit 2833A is a 100V monolithic DC/DC step-down regulator featuring the LTC7103-1. The demo board is designed for a 5V/2.3A output from a 5V to 100V input operation at a 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 (see Figure 3 in the demo manual).

The LTC7103-1 is a compact, high efficiency synchronous monolithic step-down switching regulator with fast current programming. The power switches, compensation network and other necessary circuits are inside of the LTC7103-1 to minimize external components and simplify design. The LTC7103-1 has wide operating range from 4.4V to 105V. A 40ns minimum on-time, together with 100% maximum duty cycle allow practical use at any output voltage between 1V and V_IN. The switching frequency can be programmed either via an oscillator resistor or an external clock over a 200kHz to 2MHz range. Additional features include a fast and accurate output current programming and monitoring, and ultralow EMI/EMC emissions.

The demo board has an EMI filter installed. The EMI performance of the board (with EMI filter) is shown in Figure 2 in the demo manual. The figure shows that the circuit passes the CISPR 25 radiated emission test with a wide margin. To achieve EMI/EMC performance as shown in Figure 2, the input EMI filter is required and the input voltage should be applied at +VIN_EMI turret pin.

The demo board provides current monitor and output clock signal to interface with an external application circuit. User selectable mode selection (JP1) is provided and Burst Mode^® operation position is selected by default. Burst Mode operation increases light load efficiency while pulse-skipping mode allows constant-frequency operation to a lighter load. Forced continuous mode improves output voltage ripple at light load by allowing constant-frequency operation for entire range of output load. This demo board allows phase-locked loop (PLL) synchronization to an external clock by selecting SYNC mode on JP1 and by providing a clock signal on CLKIN turret.

The LTC7103-1 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the demo manual for DC2833A. The LTC7103-1 is assembled in the 36 (26) lead QFN package. Proper board layout is essential for maximum thermal and electrical performance. See the data sheet sections for details.