LT1374HVCFE#TRPBF

Voltage - Output (Min/Fixed):	2.42V
Base Part Number:	LT1374
Supplier Device Package:	16-TSSOP-EP
Package / Case:	16-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	500kHz
Current - Output:	4.5A (Switch)
Voltage - Output (Max):	27.52V
Series:	--
Voltage - Input (Max):	32V
Voltage - Input (Min):	5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck, SEPIC
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT1374HVCFE#TRPBF is an integrated DC to DC switching regulator, designed for use in lead-free packages and with features highly focused on cost reduction. This regulator is specifically designed as a high performance one-side only flyback regulator, featuring primary-side regulation and providing improved efficiency and power density.

Application Field

The LT1374HVCFE#TRPBF is a cost effective solution for portable applications such as power adapters, TV set top boxes, remote control units, and industrial automation with embedded power applications. Its primary-side feedback structure with high accuracy reduces audio and RF noise levels, which enables it to be used in sensitive and audio applications where cost effective solutions are desired.The LT1374HVCFE#TRPBF use PWM switching control and output interface control to minimize losses and optimize efficiency. This highly integrated and resource efficient regulator solution offers constant on-time regulation, making it well-suited for battery powered low input voltage applications.

Working Principle

The LT1374HVCFE#TRPBF is a current-mode PWM controller with an integrated boost switch and synchronous rectifier. It utilizes an adaptive on-time modulation technique which results in high efficiency operation, noteably at light loads. The LT1374HVCFE#TRPBF regulator is powered from the primary side and the output from the secondary side is regulated by the PWM which senses the output voltage. This method of sensing the output voltage eliminates the need for an opto-coupler and secondary side feedback circuitry.The regulator is further optimized for light load performance by the adaptive on-time modulation which maintains the converter efficiency by dynamically adjusting the current-sense threshold and on-time duration.The regulator ensures even operation regardless of the output load and temperature variations, thanks to its integrated compensation scheme which smoothly tunes the performance for secondary-side voltage regulation.

Conclusion

The LT1374HVCFE#TRPBF DC-to-DC switching regulator is an integrated solution with several features focused on cost reduction, allowing the customer to reduce the cost and size of the power supply design while providing a high performance regulator with high efficiency, power density and reduced noise levels. The on-time feedback mechanism integrated in the regulator is designed to maximize the efficiency of the system in both heavy-duty and light-load applications.

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