Voltage - Output (Min/Fixed):	1.25V
Base Part Number:	LT1977
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:	1.5A (Switch)
Voltage - Output (Max):	55.2V
Series:	--
Voltage - Input (Max):	60V
Voltage - Input (Min):	3V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LT1977EFE#TRPBF DCDC Switching Regulator Application Field and Working Principle

Introduction

The LT1977EFE#TRPBF switching regulator is a DC-DC converter that functions by taking an input voltage from a regulated power source and converting it into a higher or lower output voltage. It is a member of the PMIC - Voltage Regulators - DC DC Switching Regulators family. It is especially useful for applications that require an adjustable output voltage, current or both.

Features of the LT1977EFE#TRPBF switching regulator

This LT1977EFE#TRPBF switching regulator provides high efficiency, low noise operation and wide input-output voltage conversion range. It has a wide input voltage range of 9V to 75V and can convert its input voltage into a higher or lower output voltage with up to 2.5A of output current. It is also thermal- and short-circuit protected and has a programmable frequency of 100KHz to 1MHz.

Application fields for the LT1977EFE#TRPBF switching regulator

The LT1977EFE#TRPBF is a versatile DC-DC converter suitable for a variety of applications. It is suitable for powering consumer electronics such as laptops, portable radios and other audio/visual equipment. The device is also suitable for industrial applications such as radio base stations, industrial process controls, automotive power supplies and aerospace power systems. It has been designed to withstand a wide range of environmental conditions, including extreme temperatures, high humidity and vibration.

Working principle of the LT1977EFE#TRPBF switching regulator

The LT1977EFE#TRPBF DC-DC converter works on a simple switch-mode conversion principle to convert the input voltage into another voltage. When the control IC switches the transistor on, the input power is applied to the primary side of the transformer and produces a magnetic flux. When the control IC switches the transistor off, the flux collapses and a voltage is induced at the secondary side of the transformer.The output voltage is regulated by controlling the on-time of the switch. The switch is turned on for a predefined amount of time and then turned off for a predefined amount of time. The ratio of the on-time to the off-time is known as the ‘duty cycle’, and this can be adjusted to control the output voltage. The output voltage can also be controlled by adjusting the frequency of the switch. When the frequency is increased, the output voltage is decreased and vice versa. The LT1977EFE#TRPBF switching regulator has a wide range of programmable frequencies ranging from 100 KHz to 1 MHz. The above mentioned features offer the user a great degree of flexibility when designing power supplies with the LT1977EFE#TRPBF switching regulator.

Advantages

The LT1977EFE#TRPBF switching regulator offers several advantages over traditional linear regulator designs. Its high-efficiency operation and wide current range allow for more power to be supplied to the load with less energy consumed from the input source. Its wide input voltage range and programmable frequencies make it an ideal choice for power applications in areas of varying input and output voltages.The LT1977EFE#TRPBF switching regulator is also more reliable than traditional linear regulator designs. This is due to the fact that it is protected from thermal effects, shorts and other transients. Additionally, the on/off switching of the control IC reduces the amount of power that is dissipated as heat, thereby increasing the reliability and reducing the overall power consumption.

Conclusion

The LT1977EFE#TRPBF switching regulator is a high efficiency, low noise and highly programmable DC-DC converter ideal for a variety of applications. Its wide input voltage range and adjustable output voltage, current or both make it ideal for powering consumer electronics, industrial process controls, radio base stations, automotive and aerospace systems. Its wide range of programmable frequencies and thermal- and short-circuit protected make it a more reliable choice than traditional linear regulator designs.

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