S-1721D1818-I6T1U

Current - Output:	150mA
Supplier Device Package:	SNT-6A
Package / Case:	6-SMD, Flat Leads
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Over Current
Control Features:	Enable
PSRR:	75dB (1kHz), 75dB (1kHz)
Current - Supply (Max):	45µA
Current - Quiescent (Iq):	1µA
Series:	S-1721
Voltage Dropout (Max):	0.35V @ 100mA, 0.35V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V, 1.8V
Voltage - Input (Max):	6.5V
Number of Regulators:	2
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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PMIC (Power Management Integrated Circuit) technology is a major development in the field of electronic power management. One type of PMIC is voltage regulators, which are used to maintain a steady voltage output from a complex power delivery network. Linear voltage regulators are one type of voltage regulator design which is becoming increasingly popular due to its low power consumption, accuracy and reliability.The S-1721D1818-I6T1U is a linear voltage regulator with a low noise, low dropout (LDO) architecture. The device supports various inputs ranging from 4V to 18V and has a programmable output voltage of 1.0V to 4.6V in 10mV increments. It is designed with a high level of power efficiency, providing up to 95% efficiency, and offering a minimum of 200mA to 20mA of current at an output voltage of 1.2V to 4.6V. Additionally, the device has a high PSRR of 56dB at 10KHz and a low quiescent current of only 2μA.The S-1721D1818-I6T1U is ideal for applications that require high accuracy and reliable operation such as digital audio, portable and hand-held communications devices, automotive, medical equipment and industrial and telecom systems.

Working Principle

The S-1721D1818-I6T1U is a linear voltage regulator based on the LDO (low dropout) architecture. This type of LDO is designed to have a very low dropout voltage and high accuracy, which allows it to maintain the regulated voltage more accurately, even in the presence of large variations in the input supply voltage.The device has an integrated error amplifier, which produces an output voltage that is proportional to the difference between the reference voltage and the output voltage. The reference voltage is preset by the user and monitored by the error amplifier. When the output voltage deviates from the preset level, the error amplifier compares it to the reference voltage and adjusts the control voltage of the power switch accordingly. This action controls the amount of current flowing through the power switch and ultimately the output voltage.

Conclusion

The S-1721D1818-I6T1U is a low noise, low dropout (LDO) linear voltage regulator with a wide input voltage range, excellent power efficiency and low quiescent current. It is suitable for a variety of applications that require high accuracy and reliable operation such as digital audio, portable and hand-held communications devices, automotive, medical equipment and industrial and telecom systems. Its integrated error amplifier, low dropout voltage and high accuracy make it an ideal choice for those applications.

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