LM2673S-5.0/NOPB

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The LM2673S-5.0/NOPB is a step-down DC-DC converter featuring integrated high-side and low-side MOSFETs, as well as providing internal overvoltage protection, undervoltage lockout, on/off control, output current protection, and reverse current protection. This device integrates both a controller core, required Vgs voltage, and bias voltage into a single package, allowing a small design footprint and easily integrated into the PCB. The LM2673S-5.0/NOPB is suitable for various applications ranging from point-of-load supplies to digital power solutions.

Application Field

The LM2673S-5.0/NOPB is suitable for a variety of applications including point-of-load supplies, digital power solutions and embedded systems. This device can be used for a wide range of input voltages (4.5V-28V) and output voltages (0.8V-5V). Additionally, the LM2673S-5.0/NOPB integrates several protection features such as undervoltage lockout, overvoltage protection and current limit protection. This makes the device an ideal choice for a variety of applications including automotive and industrial.

Working Principle

The LM2673S-5.0/NOPB is a synchronous step-down DC-DC converter. This device includes a controller core, integrated MOSFETs and a bias voltage in one package. The LM2673S-5.0/NOPB includes an internal voltage feedback network, current limit protection and undervoltage lockout. This converter operates in two modes: PWM (fixed-frequency) and PFM (pulse-frequency). In both modes, the converter is enabled by an enable pin and is disabled when the enable pin is low. In PWM mode, the converter operates in fixed-frequency (250kHz for LM2673S-5.0/NOPB). This results in less output ripple, lower EMI and higher switching frequency. In PFM mode, the converter operates in pulse-frequency. This mode improves efficiency at light loads, resulting in lower power dissipation.

The LM2673S-5.0/NOPB uses an internal error amplifier to compare the output voltage to a reference voltage and adjusts the duty cycle accordingly. The integrated MOSFET provides low resistance paths for both high-side and low-side switches. The bias ever enables a high-side MOSFET switch, reducing power dissipation and simplifying design. This device features an integrated, non-latching short-circuit protection, which will shut down the converter if an output short circuit is detected. Additionally, the LM2673S-5.0/NOPB features overvoltage protection, which will shut down the converter if an overvoltage condition is detected on the output.

Conclusion

The LM2673S-5.0/NOPB is a step-down DC-DC converter that integrates both a controller core, required Vgs voltage and bias voltage into a single package. This device can be used for a wide range of input voltages (4.5V-28V) and output voltages (0.8V-5V). Additionally, the LM2673S-5.0/NOPB integrates several protection features such as undervoltage lockout, overvoltage protection and current limit protection. This makes the device an ideal choice for a variety of applications including automotive, industrial and embedded systems.

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