LM2670S-3.3

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	LM2670
Supplier Device Package:	DDPAK/TO-263-7
Package / Case:	TO-263-8, D²Pak (7 Leads + Tab), TO-263CA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	260kHz
Current - Output:	3A
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	40V
Voltage - Input (Min):	8V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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LM2670S-3.3 Application Field and Working Principle

Introduction

The LM2670S-3.3 is a switching regulator that is part of a group of DC-DC switching regulators. These regulators use a high efficiency, fixed frequency, current mode control. The LM2670S-3.3 can deliver up to 3A of output current at an output voltage of 3.3V from a wide input voltage range of up to 40V, making it an ideal solution for a variety of DC-DC applications.

Operating Principle

At the heart of the LM2670S-3.3 is a voltage-mode switch mode power supply, which operates by utilizing the supply voltage to switch the current across the component. This operation allows the LM2670S-3.3 to draw minimal power while providing high efficiency.When operating with a fixed frequency, current-mode control, the LM2670S-3.3 can provide a steady output voltage that is independent of the input voltage and load current. In addition, the current mode control uses a pulse-width modulation (PWM) signal to regulate the output voltage of the LM2670S-3.3. When the output voltage is less than the desired value, the PWM signal will be adjusted to boost the output voltage. In cases where an increase in load requires a lowering of the output voltage, the PWM signal is adjusted to lower the output voltage and the component will not overshoot the desired value.

Features

The LM2670S-3.3 has a number of features which make it attractive for various DC-DC applications. It has a wide input voltage range of up to 40V, allowing it to be used with a variety of power supply voltages. The current mode control makes it easy to adjust the output across a wide range of load currents. In addition, the device features an onboard thermal protection circuit in order to protect it from overheating.The LM2670S-3.3 also has short circuit protection which ensures that the device is protected against output short circuits, and also prevents overloading of the device when operating in high-current environments.

Application

One of the primary applications of the LM2670S-3.3 is in the design of DC-DC switching regulators, which are used to convert a variety of different voltage levels to a desired output voltage. Other applications of the LM2670S-3.3 include:

• Power supplies for automotive, industrial, and consumer electronics
• Battery charging systems
• Audio and video equipment
• Laboratory bench supplies
• Personal computing devices
• Robotics and other remote control applications

Conclusion

The LM2670S-3.3 DC-DC switching regulator is an attractive solution for a variety of applications due to its feature set, operating principle and wide input voltage range. Its high efficiency and current-mode control make it ideal for applications that require a reliable and stable output voltage across a range of loads. Furthermore, its onboard thermal protection and short circuit protection make it well-suited for applications in varying environmental conditions.

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