AN33014UA-VB

AN33014UA-VB voltage regulator is a power management integrated circuit (PMIC) which manages the supply of power within electrical systems, specifically DC to DC switching controllers. AN33014UA-VB is designed to control the primary side of a DC/DC converter and provide control functions, utilizing both pulse-width modulation/frequency modulation (PWM/PFM) and linearly varying the duty cycle of the output to improve its efficiency.

AN33014UA-VB is a synchronous DC-DC regulator featuring a low dropout voltage and Low RDSon. It includes an internal 3.3V regulator, small external components and digital current limit, ideal for powering large digital loads, such as CPUs, FPGAs and DSPs, from a 5V input. It is suitable for a wide range of applications as embedded power supplies in communications, computing, consumer electronics, medical devices and automotive systems.

Working Principle

AN33014UA-VB includes an internal 3.3V regulator that supports output currents up to 1 A. The maximum input supply voltage of the device is 7V and can be extended up to 15V. The device contains a programmable current limit to protect the device and the load from overload. It also contains a frequency generator which is based on a phase-locked loop (PLL) circuit to provide frequency regulation.

For pulse-width modulation control, AN33014UA-VB will use a voltage mode technique to regulate the output current, where the output voltage is controlled by varying the duty cycle of the pulses. The frequency generator can be set using an external resistor, the range of output pulse frequency can be adjusted from 100 Hz to 2 MHz. This wide range in frequency allows for higher switching frequencies which can result in lower power dissipation and lower external component costs.

For frequency modulation control, AN33014UA-VB can provide duty-cycle corrections with a precision of +-0.5%. This feature is used when precise control over the output voltage is necessary. The frequency modulation uses an external voltage source to control the pulse-width of the output voltage. This external voltage source is used to ensure the output voltage remains constant, regardless of the changes in input voltage.

The voltage regulator also features a low power modes which can be used to reduce the operating current when the load is less than 1 A or when a higher output current is not required. This low power mode reduces the operating current by 25%.

Conclusion

AN33014UA-VB is a versatile PMIC which supports both pulse-width modulation/frequency modulation (PWM/PFM) and variable duty cycle to control the primary side of a DC/DC converter. It is suitable for a wide range of applications as embedded power supplies in communications, computing, consumer electronics, medical devices, and automotive systems.