MC34703PNB application field and working principle
The MC34703PNB is a highly integrated, fast response and cost-effective power management integrated circuit (PMIC). It can provide advanced power management control in two-phase system applications.
The MC34703PNB includes 1.1V and 1.8V low-noise regulation, 0.9V regulator to meet micro-processor core voltage requirements, 3.3A pulse-width-modulation (PWM) controllers and current-mode fixed frequency constant frequency synchronous rectification, fast response over-current protection, and pre-bias start up.
Applications of MC34703PNB:
The MC34703PNB is widely used in research and development, high-end handheld device, server, telecom, industrial automation, automotive and power module and other application fields, and it can work as a power supply for two phases.
It can provide regulated output, precise dynamic frequency adjustment and regulated buck PWM controller. It can be used as the power supply for micro-processor core voltage and other related peripheral power supply.
Working Principle:
The MC34703PNB contains two independent buck regulator channels, each with an adjustable fixed-frequency oscillator. Each channel provides an adjustable low-noise regulator and a PWM controlled buck converter capable of delivering 3.3A of continuous output current. The low-noise regulator provides up to 2mA of output current for micro-processor and peripheral power supply. The PWM controlled buck converter utilizes a synchronous rectifier to generate a regulated output voltage from an input voltage of up to 28V.
The MC34703PNB provides over-current protection by monitoring the current through both channels. The over-current sense circuit is comprised of an over-current threshold trip filter and an over-current trip latch. The trip latch is released through the use of an over-current clear pulse, allowing the MC34703PNB to operate without interruption in the event of an over-current condition.
The MC34703PNB also provides under-voltage lockout, adjustable soft start and timer protection functions. The adjustable soft start feature allows the user to select a slow rising waveform during startup to reduce surge currents. The adjustable timer protection feature allows the user to set a time limit to prevent the unit from staying in an over-current state for an extended period of time. This feature is especially helpful when troubleshooting problems caused by short circuits.
Conclusion:
The MC34703PNB is a cost-effective, highly integrated power management integrated circuit (PMIC) with advanced features to improve system efficiency and reliability. The MC34703PNB provides two independent regulated buck converters, an adjustable low-noise regulator, over-current protection, under-voltage lockout, adjustable soft start and timer protection features. With its built-in features and integrated design, the MC34703PNB is ideal for a variety of applications, including research and development, handheld devices, servers, telecom, industrial automation, automotive and power modules.