SG117AK-DESC

SG117AK-DESC Application Field and Working Principle

SG117AK-DESC is a kind of low dropout linear regulator that is categorized into PMIC-Voltage Regulators-Linear family. It is an integrated, three-terminal, series regulators with output current-limit protection and thermal shutdown protection. In particular, the SG117AK-DESC is a positive output adjustable voltage regulator with an output voltage from 0.8V to 4.2V, that is manufactured with NDK Sanyo Electric’s advance BiCD technology. Further, it is a very low standby power consumption regulator that is highly suitable for applications consuming low output current and operating over wide temperature range.

Apart from low dropout linear regulators, the SG117AK-DESC series also include Pin Compatible Buck DC/DC converter. The Buck converters in this series operates with an input voltage range of 4.3V to 7.0V, while ensuring a high efficiency rate with a low standby current consumption features. With its high immunity to input ripple noise, it is ideally fit for audio and video noise-sensitive applications.

Applications

The SG117AK-DESC is widely used in applications requiring low supply voltage and current in battery-powered systems. Some of its typical application fields include:

• Avionics systems
• Communication systems
• Consumer products
• Data processing systems
• Industrial applications
• Lighting controllers
• Medical equipment
• Mobile phones
• Security systems
• Tablet PCs

Working Principle

SG117AK-DESC functions as three-terminal series regulators, by positioning regulator between the input and output terminals. The inputs are taken from either a voltage source or a battery, and connect to circuit ground through a resistor. The outputs are connected to a load, and the output voltage is monitored by a voltage divider at the regulator\'s output terminal.

When the input voltage exceeds the output voltage and the load current is below the set current, the regulator operates and the current flows from the input terminal to the output terminal. The delivered current is limited by the external resistor to prevent the input and output terminals from overloading or short-circuiting. Consequently, the voltage to the load is regulated and steady.

When the temperature rises, a thermal protection circuit is also activated to prevent the device from overheating and damage. The thermal protection cuts off the output current, with the return to normal operation when the temperature falls within the safe range.