MC34063ABN

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The MC34063ABN is a PMIC (Power Management Integrated Circuit) and belongs to the voltage regulator category. It is a 1A DC/DC switching regulator and can provide either step-down, step-up, or inverting regulated power conversion.

Designed in a pin-less package, the device needs only three external inductors: the power inductor, the feedback inductor and the gate drive inductor to offer reliable, high accuracy and fast-response voltage regulation. It also features a low number of external components, minimizing the design effort and size.

The MC34063ABN has a very wide input/output voltage range and can accommodate power supply requirements from 2.5V to 40V. The operating frequency ranges between 100 kHz and 500kHz. Since many components in the system can operate at higher switching frequencies, the device is capable to reduce the size of the external components due to its high efficiency thus producing an optimal thermal performance.

Other features of the MC34063ABN include an integrated oscillator, an adaptive on-chip frequency compensation to enhance circuit stability, a hysteretic control scheme that eliminates the need for loop compensation. It also has an integrated load short-circuit protection, a separate enable pin, a pulse-by-pulse current limit, and under-voltage lockout (UVLO).

The MC34063ABN features a convenient pin-out alignment and can be connected directly with an input/output compatible with most types application transistor and TVS diode. The device integrates an output diode such as protecting MOSFET from the damaging reverse current in cases of overloads or short-circuit.

Operation of the MC34063ABN is simple. It receives an input voltage, compares it to its fixed reference voltage and drives the signal to the pass element in order to achieve the desired output voltage. It utilizes an error amplifier, a pulse width modulation (PWM) signal generator, a control logic, and a MOSFET driver as its main functional blocks.

The error amplifier is used to compare the actual output voltage to the reference voltage. The PWM signal generator produces a discrete signal with a duty cycle that is internally adjusted. The control logic is responsible for the switching of the MOSFET, the protection circuits and monitoring the operating conditions. Lastly, the MOSFET driver supplies the voltage that is necessary for the MOSFET to switch on and off.

The MC34063ABN therefore provides a cost-effective and compact solution for DC/DC step-down and step-up voltage conversion applications. Its low external component count and wide input/output voltage ranges make it ideal for a wide range of power management applications such as mobile phones, notebooks, computers, IMDs, and disk drives.

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