KA278R05CYDTU

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KA278R05CYDTU Application Field and Working Principle

PMIC - Voltage Regulators - Linear

KA278R05CYDTU is a series of three terminal linear regulators manufactured by ON Semiconductor. The series is designed to offer low-cost, high-efficiency power solutions in space-constrained applications. Featuring internal compensation and adjustable output, the KA278R05CYDTU serves as a cost-effective alternative to discrete designs. With very good protection features and low dropout voltage, as well as lower system cost and size, the KA278R05CYDTU is well-suited for a wide range of cost-sensitive and space-constrained applications.

Features

• Adjustable Output Voltage
• Output Voltage Range: 1.2 V to 6 V
• Dropout Voltage: 0.2 V at 1 A
• Low Quiescent Current: 2.5 mA
• Thermal Shutdown Protection
• Internal Compensation
• Output Current Limit and Short Circuit Protection
• Overtemperature Protection
• High Voltage Transient Immunity
• Internal Relief FET
• Low Power Dissipation

Applications

• Battery-Powered Devices
• Portable Computers
• Cordless Communications
• Consumer Electronics
• A/D and D/A Converters
• Automotive Applications
• Handheld Recorders

Working Principle

The KA278R05CYDTU is a three-terminal linear voltage regulator and the input voltage applied at its common pin is regulated down to the regulated voltage at its regulated output. This regulated output voltage is determined by the value of a resistor (RSET) connected externally to the device. A control element, commonly referred to as an error amplifier, is responsible for regulating the output voltage to the desired value. The error amplifier compares the output voltage with respect to an internal reference voltage, and adjusts the output current of the regulator in order to keep the output voltage constant.

When the load increases and more current is drawn, the output voltage of the regulator will decrease accordingly. The error amplifier senses this decrease and increases the output current by increasing the base current of the pass transistor (usually a PNP transistor). This process continues and the regulator continuously adjusts its output current until the output voltage equals the reference voltage.

The KA278R05CYDTU also incorporates protection features that protect the regulator from faults, such as short circuit, over temperature, and output current limit. The device also features an internal relief-FET and a low dropout voltage (LDO) option. This allows the device to maintain high load regulation even at low input voltages.

Conclusion

The KA278R05CYDTU is a three-terminal linear voltage regulator designed to offer cost-effective power solutions in space-constrained applications. Featuring adjustable output voltage and internal compensation, the device is well suited for battery-powered devices, portable computers, cordless communications, and automotive applications. The device also features low dropout voltage and integrated safety features such as thermal shutdown protection and output current limit.

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