LM2670S-12

PMIC - Voltage Regulators - DC DC Switching Regulators

The LM2670S-12 is a DC-DC switching regulator controller that provides a small, efficient, and low-noise solution for the design of a step-down regulator. This device can output up to 12V from a 3V to 18V input and is qualified for automotive applications.

Application Field

The LM2670S-12 is a versatile and efficient controller for the design of step-down DC-DC converters, which can be used in a wide range of applications. It is ideal for automotive power systems such as power windows, windshield wiper motors, and audio/video systems. The controller can also be used in consumer electronics where switching noise and efficiency are critical, such as notebook computers, PDAs, and cell phones. The device is also suitable for industrial applications such as alternative power systems and battery-operated equipment.

Working Principle

The LM2670S-12 provides all the features required to build an adjustable, pulse-width-modulated step-down DC-DC converter. It contains an internal, fixed-frequency oscillator, an error amplifier, and a high-side and low-side output driver pair. The oscillator sets the switching frequency and can be adjusted to minimize EMI. The error amplifier provides abootstrap feedback voltage to the comparison amplifier for regulating the output voltage. The output driver pair is capable of supplying load currents up to 4A and switching frequencies from 40kHz to 1MHz. The LM2670S-12 also provides a logic-level enable input, an overcurrent fault signal, and protection against UVLO, excessive LDO output current, and thermal shutdown.

Conclusion

The LM2670S-12 is a versatile, efficient, and low-noise DC-DC switching regulator controller that provides adjustable voltage output, current limiting, and protection for automotive and consumer applications. It has an internal oscillator for adjustable switching frequency, an error amplifier for regulating output voltage, and a logic-level enable input so that the regulator can be turned on and off as needed. It also has protection against UVLO, excessive LDO output current, and thermal shutdown. The device is well suited for a variety of applications such as automotive power systems, consumer electronics, and alternative power systems.