LM3671TL-2.8/NOPB Integrated Circuits (ICs)

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The LM3671TL-2.8/NOPB is a low-voltage, high-efficiency, high-current, step-down power supply specifically designed to efficiently provide up to 2.8A of continuous output current to microprocessors, digital signal processors and other applications running at low power supply voltages. The LM3671TL-2.8/NOPB is part of the USB-capable family of the LM3671TL step-down DC DC switching regulator. This family uses advanced Non-Synchronous Return to Zero (NSRZ) techniques to reduce the total power dissipation during light to medium load conditions. This NSRZ technique is ideal for portable systems where higher efficiency equates to longer run-times.

The LM3671TL-2.8/NOPB application field includes microprocessors, digital signal processors, battery-powered systems and other systems requiring efficient step-down voltage regulation. These devices are also used in automotive, industrial and white goods applications. The LM3671TL-2.8/NOPB has a wide range of operating conditions and includes an on-chip adjustable soft-start feature to limit inrush current.

The working principle of the LM3671TL-2.8/NOPB is to convert a higher output voltage to a lower voltage using a power switch (MOSFET). The device switches the current through the power switch from the input voltage to the output voltage. The power switch is switched on and off by the control circuit (Vout sensing circuit), which is based on the feedback from the output voltage.

The voltage mode control loop of the device operates as follows. It starts with the voltage sense circuit monitoring the output voltage and providing a feedback signal to the PWM comparator. When the output voltage is lower than the desired voltage, the voltage sense circuit sends an error signal to the PWM comparator. The PWM comparator then instructs the pump circuit to pull the gate of the power switch high. This then turns on the switch and the current is delivered from the input voltage to the output voltage. When the output voltage rises above the programmed set point, the error signal is reversed and the switch is turned off.

The current mode control loop operates in a similar fashion. The current sense circuit monitors the current delivery and provides a feedback signal, based on which the PWM comparator sends controls signals to the pump circuit to control the switch. If the output current falls below the programmed level, the current sense circuit sends an error signal to the PWM comparator, which turns on the switch. When the output current reaches the set point, the error signal is reversed and the switch is turned off.

The LM3671TL-2.8/NOPB also has a wide range of safety features, including over-temperature protection, under-voltage lockout, and over-current protection. Additionally, the device features a low quiescent current, making it suitable for low power applications.

In summary, the LM3671TL-2.8/NOPB is a low-voltage, high-efficiency, high-current, step-down power supply specifically designed to efficiently provide up to 2.8A of continuous output current to microprocessors, digital signal processors and other applications running at low power supply voltages. The device includes a wide range of safety features and has a low quiescent current ideal for low power applications. The LM3671TL-2.8/NOPB application field includes microprocessors, digital signal processors, battery-powered systems and other systems requiring efficient step-down voltage regulation. The device utilizes voltage and current mode control with a Non-Synchronous Return to Zero (NSRZ) technique to provide high efficiency and improved load transient response.

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