LT3971AIMSE-5#TRPBF

Voltage - Output (Min/Fixed):	5V
Base Part Number:	LT3971
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:	200kHz ~ 2MHz
Current - Output:	1.2A
Voltage - Output (Max):	--
Series:	--
Voltage - Input (Max):	38V
Voltage - Input (Min):	4.3V
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

Linear Technology’s LT3971AIMSE-5#TRPBF is a high frequency adjustable step-up switching buck regulator designed for low standby power. With integrated power MOSFETs, fast transient response and adjustable current limit, the device is well-suited for a wide range of system designs that require high performance. This application report describes the application field and working principle of the LT3971AIMSE-5#TRPBF.

Application Field of LT3971AIMSE-5#TRPBF

The LT3971AIMSE-5#TRPBF is a high performance DC-DC switching regulator, normally used in portable and battery powered applications. It extends battery lifetime by providing a high switching frequency, low dropout voltage, low current draw when in shutdown mode, and adjustable current limit for improving system stability and reliability. This device is particularly useful for application such as remote control car, LED driver, portable instrument, cell phone, etc where current and voltage must be regulated precisely. As the internal synchronous power MOSFETs reduce the amount of external components, it allows for a wide input voltage range from 1.8V to 40V while still offering adjustable 0.8V to 5V output, up to 1.2A (1A as typical) current capability, and a high switching frequency, with a programmable frequency range of 500kHz to 4MHz, making it suitable for high-performance applications.

Working Principle

The LT3971AIMSE-5#TRPBF works according to the following principle. When the device receives power, the synchronous MOSFETs along with the internal bias voltage, initiate a switching sequence, thereby providing a regulated output voltage. This device incorporates three functions (voltage/current monitoring, soft start-up, and thermal shutdown) that enable it to address complex requirements in an adjustable and efficient manner.The LT3971AIMSE-5#TRPBF includes a regulated voltage loop, an adjustable current limit loop, and a soft-start loop. When the device receives power, the Voltage loop monitors the output voltage and regulates it by controlling the ON/OFFcycle time of the power MOSFETs. The current limit loop monitors the output current, and if required, turns off the switch at set limits. The softstartloop ensures that no stressed or surge current flows by controlling the voltage rise per cycle. Additionally, the device also has a thermal shutdown feature that protects the device against thermal overloads.In summary, the LT3971AIMSE-5#TRPBF is a high frequency adjustable step-up switching buck regulator designed for low standby power. Its integrated power MOSFETs, fast transient response and adjustable current limit makes an ideal choice for a wide range of system designs that require improved reliability and performance. It is especially suitable for battery powered applications, covering a wide range of input and output voltages and providing adjustable current limit for improved reliability. With its three-way protection control structure, advanced functionality and offer excellent performance, the LT3971AIMSE-5#TRPBF is perfect for advanced applications.

Conclusion

The LT3971AIMSE-5#TRPBF is a high frequency adjustable step-up switching buck regulator designed for low standby power. It is well-suited for a wide range of system designs that require high performance. Especially useful for portable and battery powered applications, the device provides a wide range of input and output voltage support, adjustable current limit for improved reliability, fast transient response and thermal overload protection. With its advanced functions and excellent performance, the device is an ideal choice for any advanced system design.

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