105V, 2.3A step-down regulator: 96% efficiency, ultralow EMI

105V, 2.3A step-down regulator: 96% efficiency, ultralow EMI

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By Graham Prophet

This suits the LTC7103 for a variety of transportation, industrial and communications applications such as 48V automotive, 36V to 72V telecom, avionics and dual battery vehicle systems. The devices 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.


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. It 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. It 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.


Analog Devices/Linear Technology;


next page; feature listing…

LTC 7103

Wide VIN Range: 4.4V to 105V (110V Abs Max)

Ultralow EMI/EMC Emissions: CISPR 25 Compliant

2 µA IQ When Regulating 48 VIN to 3.3 VOUT

Fast and Accurate Output Current Programming and Monitoring with No External RSENSE

Brick Wall Current Limit

Low Minimum On-Time: 40 nsec

Wide VOUT Range: 1V to VIN

100% Maximum Duty Cycle Operation

Programmable Fixed Frequency: 200 kHz to 2 MHz

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

EXTVCC LDO Powers Chip from VOUT = 3.3V to 40V

OPTI-LOOP or Fixed Internal Compensation

Input and Output Overvoltage Protection

Thermally Enhanced (5 × 6 mm) QFN Package

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