LM2678S-12/NOPB

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LM2678S-12/NOPB is a DC DC switching regulator used in PMIC (Power Management IC) voltage regulation applications. It is designed to provide a constant output voltage and adjustable current limiter for applications such as laptop computers, modems, and other power sensitive electronic applications.

LM2678S-12/NOPB contains an integrated switch with an internal driver, allowing it to work as a Buck regulator. It is capable of operating with a supply voltage range of 4.5-60V, and output currents between 0-1A. The adjustable current limit adjusts the output current limit from 0-1A.

The device is capable of providing either a buck or boost regulator operation depending on the input and output voltages, with over voltage protection for both output and input according to the specified parameters. It also includes an internal soft start, thermal shut down and programmable current limit. Power up sequencing is also provided to ensure optimum performance.

LM2678S-12/NOPB can operate in either a continuous or pulse-width-modulated (PWM) mode for efficient and noise-free operation. It has excellent line and load regulation, low output noise and low ripple. The device is designed to be small and efficient.

LM2678S-12/NOPB is suitable for use in a variety of high performance applications including telecommunications, industrial and consumer equipment, and automotive applications. It is compliant with the RoHS Directive and is available in SOIC-14, SIP-14, and TDFN-14 packages.

LM2678S-12/NOPB’s working principle is based on the switching regulator topology, whereby it switches an internal switch on and off at a given frequency, hence regulating the output voltage. The switching frequency is determined by the internal clock frequency and the external components connected to the device.

The device includes a voltage reference, an operational amplifier, a pulse width modulation comparator, and a driver for the internal switch. The voltage reference sets the average output voltage, with the operational amplifier providing regulation to ensure that the output voltage remains constant.

The pulse width modulation comparator compares the internal reference voltage to the output voltage, and uses the data generated to adjust the output voltage. The driver controls the switch, which turns it on and off to regulate the output voltage.

The device also includes a current limit circuit that prevents the load current from exceeding the set limit. This prevents hardware damage and also facilitates efficient power management.

Overall, LM2678S-12/NOPB offers improved thermal performance, higher efficiency, excellent line and load regulation, low ripple, and low output noise. The device is suitable for use in a variety of power sensitive applications.

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