KA78R08CTU

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KA78R08CTU is a device belonging to the group of voltage regulators and more specifically of linear voltage regulators.

This device, produced by ON semiconductor, is a Single output, low dropout, high output current, lDO (Low Dropout) voltage regulator with shutdown, suitable for applications that require low quiescent current and high-ripple rejection.

It integrates an internal P-channel MOSFET that requires a very low quiescent current to supply its output and with the shutdown capability can be disconnected from the circuit for very low power consumption.

KA78R08CTU is designed to provide a regulated output voltage over a wide input voltage range, and it features an overload protection to prevent functionality failures.

The output voltage may be adjusted with a single resistor while the output current can reach up to 1.5 A. It also integrates thermal shutdown to prevent operation at excessive temperatures.

The regulator has a maximum input voltage of 8 V and a minimum operating temperature of -40 ºC up to 85 °C. The device is available in a TO-220-3L package and the output voltage range is adjustable from 1.2 to 6 V.

The working principle of this device is simple: it has an internal P-channel power MOSFET that is connected between the output and the battery. This MOSFET operates as a switch between the two nodes, controlling the current flowing from the battery so that the output voltage is maintained at the set level (between 1.2 to 6 V).

The output voltage is regulated by a feedback circuit that drives the gate of the P-channel MOSFET. This circuit uses an error amplifier to compare the output voltage with a reference voltage (1.25 V) and adjusts the gate voltage of the MOSFET accordingly.

In addition, the device also incorporates a current limit circuit to prevent the flow of excessive current, thereby protecting itself. This current limit circuit works by monitoring the voltage drop across the MOSFET and when the voltage drops below a certain level, it limits the amount of current flowing through the device.

KA78R08CTU is suitable for a wide range of applications, including power management in mobile phones, portable electronics, digital still cameras and battery-powered devices. Other possible applications include level shifting, power supply for LCDs and buffers for line powered circuits.

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