LM2672N-12/NOPB

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The LM2672N-12/NOPB is an ultra-low power DC-DC switching regulator with integrated internal power switches that is used in many small power applications. It is a very popular, cost-effective PMIC switching regulator solution that is widely used in today’s applications. The LM2672N-12/NOPB application field and working principle are discussed in this article.

The most common applications for the LM2672N-12/NOPB switching regulator are in high efficiency power supplies, especially for DC to DC converters with output power levels of less than 1 Watt. The LM2672N-12/NOPB has been designed to provide a tight regulation of output voltage across all load conditions, while providing very low standby power consumption. Its integrated synchronous MOSFET allows the device to reach efficiency levels up to 94%. This PMIC can be used in a wide variety of applications, such as portable electronic devices, automotive electronics, battery powered equipment, LED lighting systems, and other low power applications.

The LM2672N-12/NOPB DC-DC switching regulator features a wide step-down current mode control input voltage of up to 12V, and can supply up to 250mA output current. The output voltage is adjustable through an external resistor. The device supports wide loading conditions and light-load scheme, and also features an integrated power switch operating at an adjustable switching frequency up to 1.2MHz. The device integrates current limiting, thermal protection, and under voltage protection functions.

The LM2672N-12/NOPB switching regulator works using a current-mode control scheme. The device contains an internal error amplifier, PWM comparator, driver, and synchronous MOSFET. An external resistor connects the error amplifier\'s inverting input to the output voltage feedback. The reference voltage is supplied to the error amplifier\'s non-inverting input via an external resistor divider network. The error amplifier compares the output voltage feedback to the reference voltage and drives its output. The PWM comparator compares the error amplifier output to an internal ramp signal to generate pulses. The PWM output is then used to drive the power switch directly, which is the synchronous MOSFET. The PWM comparator also controls the power switch on-time. During the on-time, energy is transferred from the input voltage to the output voltage.

The LM2672N-12/NOPB also features a wide output ripple control loop. An external capacitor is introduced across the feedback resistor to reduce the output ripple. The ripple frequency is determined by the peak current detected at the error amplifier output. The output ripple frequency is then used to adjust the ramp signal, which results in a reduced output ripple voltage.

In summary, the LM2672N-12/NOPB is a low power PMIC switching regulator solution that is commonly used in a wide range of small power applications. Its integrated synchronous MOSFET allows the LM2672N-12/NOPB to reach a high efficiency level, while the current-mode control scheme and the wide output ripple control loop ensure the output voltage stays tightly regulated. The device features various features, such as adjustable switching frequency, current limiting, thermal protection, and under voltage protection, which make it well-suited to use in many small power applications.

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