LT3970IDDB#TRPBF

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The LT3970IDDB#TRPBF regulator is classed as a high efficiency, synchronous buck regulator and part of the DC-DC switching regulator family. It is designed for applications where a high current output is required, such as in industrial, automotive, and other similar systems. As one of Linear Technologies’ cutting-edge voltage regulators, the LT3970IDDB#TRPBF provides excellent performance with its wide range of features, including adjustable operating frequency, programmable over-voltage protection, current-mode operation, line or load transient response, and burst mode switching for improved efficiency.

External Components

The LT3970IDDB#TRPBF regulator requires a few external components to operate. The components include input and output capacitors, an inductor, a freewheeling diode, an input voltage filter and an output voltage filter.

Features and Benefits

The LT3970IDDB#TRPBF regulator has a wide range of features that make it an excellent choice for applications requiring high current output. The switch current limit is adjustable via an external resistor, allowing it to operate at lower current limits while minimizing component size and cost. The control loop has a programmable frequency from 300 kHz to 1.2 MHz, allowing for optimized system performance. The synchronous rectifier is diode-emulated, reducing component count and heat dissipation in the overall circuit. The LT3970IDDB#TRPBF has built-in over-voltage protection with hysteresis to prevent unexpected output overshoot. In addition, the LT3970IDDB#TRPBF features a low shutdown current of 10 µA and an adjustable operating temperature from -40°C to 125°C.

Application Fields

The LT3970IDDB#TRPBF regulator is ideal for applications requiring a high current output such as industrial, automotive, and aerospace applications. The regulator\'s adjustable frequency, current limit, and overvoltage protection make it a suitable choice for a wide range of applications, including motor drive controllers, point-of-load converters, DC-DC power supplies, and Li-Ion battery-powered applications. The LT3970IDDB#TRPBF\'s wide operating temperature range makes it suitable for extreme environmental conditions, such as in automotive or aerospace applications.

Working Principle

The LT3970IDDB#TRPBF regulator uses a synchronous buck regulator topology to achieve excellent efficiency and regulation. The input voltage is applied to the input capacitor, which is then stepped down by a MOSFET switch in switching mode operation. The switch is driven by an internal PWM controller which controls the on-off operation accordingly. The inductor stores the current as it is switched on and off, allowing the voltage at the switch\'s drain to exhibit inductive behavior. The output voltage is then regulated by varying the on-off time of the switch. The output filter capacitor and the freewheeling diode smooth out the voltage waveform, reducing voltage ripple at the output.

Conclusion

The LT3970IDDB#TRPBF regulator is an excellent choice for applications requiring higher current outputs. It has a wide range of features and adjustable parameters, making it ideal for a variety of applications, from industrial to automotive and aerospace. The regulator provides excellent efficiency, line and load transient response, and overvoltage protection for improved system reliability. Its adjustable frequency and current limit allow for smaller and cost-effective designs. With its wide operating temperature range, the LT3970IDDB#TRPBF is suitable for extreme environmental conditions.

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