LM2574DW-ADJR2G

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The LM2574DW-ADJR2G is a high-efficiency DC-DC step-down converter that is part of Texas Instruments’ wide range of switching regulators. It features a wide operating input voltage range of 4.5V, adjustable output voltages ranging from 0.5V, and a low operating quiescent current of 20μA at 3.3V. The LM2574DW-ADJR2G is optimized for the power-sensitive applications and is suitable for a broad range of non-isolated converters. It is housed in an 8-pin SOIC package, making it ideal for automated assembly equipment.

Application Field

The LM2574DW-ADJR2G is commonly used to convert standard voltage sources such as +5V or +12V, to a low voltage such as +3.3V or +1.8V. Other applications of this switching regulator include, but not limited to, handheld devices, battery-powered systems, and other regulated power supplies. Because of its adjustable output voltage range, precision and low quiescent current, the LM2574DW-ADJR2G is well-suited for power-sensitive applications.

Working Principle

The LM2574DW-ADJR2G device is a synchronous buck, which uses both high and low side switches to convert the high input voltage to a low output voltage. The device contains two power switches, comprising a high side P-channel and low side N-channel MOSFETs, plus their respective drivers. It is based on a fixed frequency, current-mode control concept that measures the average current and allows for fast transient response. The device provides fixed-frequency operation and cycle-by-cycle peak current limit protection.

The LM2574DW-ADJR2G provides a constant output voltage. It uses a voltage divider connected between the output and feedback pins. The current through the divider is then converted into a voltage which is then compared to a reference voltage. The error signal is then used to adjust the current to the output. The output voltage is then adjusted appropriately to maintain the desired voltage level.

Also, the LM2574DW-ADJR2G features an internal ±2% accuracy band gap reference, ensuring the output voltage remains within the specified tolerance over the operating temperature range. It also provides over-temperature protection with automatic retry, thermal shutdown with hysteresis, and under-voltage lockout. The device offers an adjustable output current limit and an adjustable output voltage.

Conclusion

The LM2574DW-ADJR2G is an ideal choice for applications requiring adjustable output voltage. It is a synchronous buck with a wide operating input voltage range and a low quiescent current. With its cycle-by-cycle peak current limit protection and over-temperature protection, the LM2574DW-ADJR2G is a great choice for non-isolated converters. Thus, the LM2574DW-ADJR2G is an excellent choice for applications requiring adjustability, precision, and low power dissipation.

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