MC33269D-3.3

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MC33269D-3.3 (hereinafter referred to as MC33269) is a monolithic adjustable positive voltage regulator developed by Motorola in its Linear series of voltage regulators. The 3.3V output MC33269 is designed to provide an output voltage with two fixed-voltage options (2.97V, 3.13V) that can be adjusted over a 1V range of output voltages, depending on the external components selected. This is the most common form of the MC33269 voltage regulator, the adjustable version.

The MC33269 is a three-terminal adjustable voltage regulator, providing a wide range of output voltages from 2.7V to 20V. The inputs of this regulator are the Adjust terminal (ADJ) and the Power Supply terminal (VIN). The output from the regulator is taken from the Output terminal (VOUT). The typical quiescent current for the MC33269 is 20mA.

The MC33269 is easy to use, with straightforward connections and minimal external components required. It requires only an external resistor for setting the output voltage, plus an optional capacitor for improving the output ripple rejection.

The MC33269 can be used in a variety of applications, such as regulated power supplies, battery-backed supplies, self-contained backlighting systems, and automotive applications. It is suitable for use in both low- and high-power applications.

The basic operating principle of the MC33269 is based on the assumption that the applied voltage is greater than the desired output voltage. The output voltage is regulated by decreasing the input voltage through a series resistor connected in between the adjustable terminal (ADJ) and the output terminal (VOUT). The output voltage is then given as:

VOUT [V] = VREF [V] + (VIN [V] - VREF [V]) x Rfoot [Ω] / RADJ [Ω]

Where VREF = 1.24V, Rfoot = 100kΩ, and RADJ = connected resistor between the Adjust terminal (ADJ) and the Output terminal (VOUT).

The MC33269 provides improved line and load regulation by using an integrated error amplifier to monitor the output voltage and adjust the current control circuit. In addition, the MC33269 has a temperature-compensated reference voltage, which reduces tracking errors and improves the temperature stability of the output voltage. The MC33269 also has the ability to sink or source current from an external load.

The MC33269 also offers protection features for over-voltage, short-circuit protection, overtemperature protection, and self-protection, making it ideal for use in a wide range of applications. The MC33269 is also lead- and halogen-free, making it RoHS compliant.

The MC33269 is a low-cost, easy-to-use solution for providing a regulated output voltage with good line and load regulation. It is an ideal choice for applications where a wide range of output voltage settings, protection features, and temperature-compensated reference voltage are needed.

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