MC34063ECD

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The MC34063 is a versatile, self-contained DC-DC switching regulator that comes in a low-cost, 6-pin SOT-223 or an 8-pin SOIC package. It is capable of providing output power of up to 1.5 A, an input voltage range of 4.5 to 32 V and an output voltage range of 0.8 to 28 V. It is highly efficient, with a typical efficiency of up to 90%. The MC34063 is a highly configurable device, allowing the user to customize the regulators\' power management functions to suit their application. This article explores the MC34063\'s application fields, working principles and specifications.

Application Fields

The MC34063 is designed to be used in a variety of applications, such as low-voltage DC-DC converters, DC-DC boosters, DC-DC inverters and DC-DC converters with synchronous rectification. It can also be used to convert AC-DC or DC-AC in versions requiring outboard components. This makes it an ideal choice for applications in a variety of industries, including automotive, medical, communications, industrial control, computer/server/storage, consumer electronics, as well as power systems.

Working Principle

The MC34063 is a pulse width modulation (PWM) integrated circuit that works by generating a square wave of desired frequency at the output stage. The device uses a sawtooth control voltage to modulate the width of the pulses, allowing for precise regulation of the output voltage. The PWM generator charges a capacitor, which is connected to the output stage, and the output voltage is regulated by adjustable resistors. The two main components of the MC34063 are the oscillator and the switching arrangement.

Oscillator Stage

The MC34063 is equipped with an oscillator circuit, which is used to generate a fixed frequency signal. The frequency of the oscillator is controlled by an external resistor and capacitor. The oscillator circuit also serves as a divider/multiplier for generating the various switching times for the output stage. It also has an under-voltage lockout feature to protect against low input voltages.

Output Stage

The output stage is where the actual voltage conversion takes place. There are two MOSFETs in the output stage – one N-channel and one P-channel – which are used to switch the output voltage on and off. The output voltage is regulated by adjusting the duty cycle of the switching signal, which is controlled by the oscillator stage. The output voltage is also protected against over-voltage and over-current.

Specifications

The core specifications of the MC34063 include the output voltage range of 0.8 to 28 V, input voltage range of 4.5 to 32 V, a maximum output power of 1.5 A, a switching frequency of 100 kHz, a load current of 0.2 A to 1.5 A, a junction temperature range of -40°C to +125°C, a storage temperature range of -65°C to +150°C, and a quiescent current of 6 μA. The switching regulator also offers short-circuit protection, current limit protection, and thermal shutdown.

Conclusion

The MC34063 is a reliable and efficient DC-DC switching regulator that is highly configurable and can be used in a variety of applications. It is available in a low-cost 6-pin SOT-223 or an 8-pin SOIC package, and offers a wide input voltage range of 4.5 to 32 V and an output voltage range of 0.8 to 28 V. It also has built-in functions such as current limit and thermal shutdown. The MC34063 is ideal for applications in the automotive, communications, consumer electronics, industrial control, medical and power systems industries.

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