S-1200B21-A6T1U

Application Field
The S-1200B21-A6T1U can provide excellent power supply accuracy, low drop-out (LDO) performance and compatibility with a wide variety of voltage regulator applications. It is particularly well-suited for applications requiring a robust and highly accurate system power solution such as portable systems, set-top boxes, personal media players and other consumer electronics.Due to its low quiescent current consumption, the S-1200B21-A6T1U is also suitable for low power applications such as cellular handsets, tablets, wearables and other connected devices. In addition, its high input voltage range and tight output voltage accuracy makes it well-suited for use in high current, point of load (POL) applications.Working Principle
The S-1200B21-A6T1U is an ultra-low drop-out (LDO) linear voltage regulator that uses a Feedback Negative Voltage (FNV) regulation scheme. The device achieves this by controlling the gate-source voltage of an N-channel MOSFET and allowing it to pass a certain amount of current at any given time.When the input voltage to the regulator is greater than the output voltage, the FNV voltage maintains the output voltage at the set level by controlling the gate voltage of the MOSFET. When the input voltage falls below the output voltage, the FNV voltage is reduced, resulting in less current conduction through the MOSFET and therefore less output current. This results in the regulator dropping out at a lower voltage than most other LDOs.The S-1200B21-A6T1U also features a wide adjustable output voltage range, superior transient response and excellent PSRR performance. This enables it to deliver highly accurate and consistent power supply regulation in a wide range of applications, even in the presence of a noisy input source.