UA78M12CKCSE3

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PMIC - Voltage Regulators - Linear

The UA78M12CKCSE3 is a device used in power management; it\'s a voltage regulator and a member of the linear regulators family. Specifically, it\'s a low-dropout (LDO) linear regulator, with a maximum fixed output voltage of 12V. Linear regulators are used to precisely regulate and maintain the desired output voltage. This is accomplished by realizing a constant voltage drop across the regulator, regardless of load current fluctuations.

The UA78M12CKCSE3 is part of a 7th generation high speed LDO series from Texas Instruments, the UA78M family. These devices are the fastest LS LDOs in the family, with the ability to work reliably up to 1.5 MHz, providing efficient dynamic load transient performance in a small 3mm2 area. The high speed delivery is combined with an excellent low-noise performance, high PSRR and low quiescent current.

The typical application field of the UA78M12CKCSE3 is in general purpose low-noise, low-dropout voltage regulation. It can be used to achieve low noise and low quiescent current in the power supply and voltage conversion stages, served in the output stages of the system. It can be used in a variety of applications, including battery-powered portable applications, automotive systems and industrial control systems.

Working principle:

A linear regulator is a three-terminal electronic component that requires an input voltage slightly higher than the output voltage in order to regulate that output voltage. The devices comprises of four functional blocks: the input voltage limiting and decoupling, the internal power diode, the error amplifier, and the pass element and output decoupling. The pass element is usually MOSFET, that is controlled by external resistors and/or voltages.

When the input voltage is greater than the output voltage, the MOSFET is allowed to conduct and a steady current flows through the pass element and drops the voltage across the load. The voltage drop across the MOSFET is typically granted to an internal error amplifier. This amplifier is compared with an external reference voltage, and causes the MOSFET to increase or decrease the current flow according to the result of the comparison. This event maintains the output voltage at the desired level. Due to the operation of this voltage feedback loop, the output voltage is regulated and the supply can account for load current fluctuations.

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