LT3973EMSE-5#TRPBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT3973
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	195kHz ~ 2.15MHz
Current - Output:	750mA
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	42V
Voltage - Input (Min):	4.2V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction
The LT3973EMSE-5#TRPBF is a synchronous buck regulator from Linear Technology. It is part of their Easy-to-Use series of regulators and is a highly efficient, low quiescent current switching regulator. This device has two wide input voltage ranges and can deliver up to 4A of output current. It is designed to be used in a variety of applications, including point-of-load systems, DC/DC converters, and battery chargers. Additionally, the LT3973EMSE-5#TRPBF is well-suited for applications in industrial, automotive, and telecommunication systems, owing to its over-temperature, over-current, and over-voltage protection features.
Application Field
The LT3973EMSE-5#TRPBF can be used in a range of applications. It is suited for use in general purpose DC/DC converters and boost circuits, and is also well-suited for powering point-of-load systems and battery charging applications. Additionally, the device has over-temperature, over-current, and over-voltage protection features that make it suitable for use in automotive, industrial, and telecommunication systems. The LT3973EMSE-5#TRPBF provides two wide input voltage ranges and can deliver up to 4A of output current. The device is designed to operate in an adjustable output voltage range from 0.6 V to 5.5V, and the device’s synchronization range allows it to achieve frequencies up to 2.5 MHz. This versatility allows designers to tailor the regulator’s performance to their specific requirements.
Working Principle
The LT3973EMSE-5#TRPBF is a synchronous buck regulator that operates via pulse width modulation (PWM). In this mode of operation, the output voltage is regulated by varying the duty cycle of the output pulses, with a high duty cycle resulting in a higher output voltage and a low duty cycle resulting in a lower output voltage.The power switch of the LT3973EMSE-5#TRPBF is composed of two PMOS MOSFETs. During normal operation, current flows through the upper MOSFET, charging the output capacitor and raising the output voltage. This energy is then transferred to the lower MOSFET, which then discharges the output capacitor, lowering the output voltage.The device is powered by an external voltage source, which must be greater than the output voltage. The power switch is controlled by a low noise internal oscillator, allowing for accurate output voltage regulation. In addition, the LT3973EMSE-5#TRPBF includes a shutdown pin that can be used for secondary control of the output voltage, allowing more precise control of the output setting than is possible with the internal oscillator alone.In addition, the device includes several protection circuits to ensure safe operation. These include under voltage lockout, thermal shutdown, over-current protection, cycle-by-cycle current limiting, and short-circuit detection.Overall, the LT3973EMSE-5#TRPBF is a high efficiency, low quiescent current buck regulator, designed for a variety of applications. Its wide input voltage range and high-current output make it suitable for use in point-of-load systems, battery charging, automotive, industrial, and telecommunication systems. The LT3973EMSE-5#TRPBF is a highly versatile device, thanks to its adjustable output voltage range and its ability to be synchronized with an external clock. The multiple protection features ensure safe, reliable operation.

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