S-1741C21-M5T1U4

Voltage Dropout (Max):	0.04V @ 10mA
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Over Current
Control Features:	Enable
PSRR:	--
Current - Quiescent (Iq):	530nA
Current - Output:	100mA
Series:	S-1741
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.1V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionThe S-1741C21-M5T1U4 is a linear voltage regulator from Semtech Corporation. It is a three-terminal, low-dropout regulator with low input voltage and low dropout voltage. It is suitable for applications where power efficiency is of utmost importance and where a high level of input-voltage regulation is required. The device features adjustable output voltage from 1.2V to 13.2V, and can deliver up to 2A of load current.ApplicationsThe S-1741C21-M5T1U4 can be used in a variety of applications, including cellular phones, PDAs, industrial monitoring equipment, automotive electronics, and battery-powered applications. With its ability to provide precise, low-noise output voltages, it is also suitable for use in mobile phone and handheld computer applications. In mobile phones and personal digital assistants, the S-1741C21-M5T1U4 can be used to supply power to the LCD display, memory, and peripheral devices. It can also provide a regulated output voltage to power the audio amplifier and the low-noise microphone preamplifier. In automotive electronics, the S-1741C21-M5T1U4 can be used to power the engine, HVAC, and infotainment systems. In addition, it can be used to supply regulated power for the displays, sensors, and other components used for safety and driver convenience.Working PrincipleThe S-1741C21-M5T1U4 is a three-terminal device with an input, an output, and a ground terminal. The input terminal is connected to the input voltage source, the output terminal supplies the adjustable output voltage and the ground terminal is connected to the ground. The device uses a stability loop to maintain a constant input-to-output voltage differential, or dropout voltage.When the input voltage exceeds the output voltage by a predetermined amount, the loop activates and turns on the pass transistor. This supplies power to the load, thus increasing the output voltage. As the output voltage approaches the input voltage, the pass transistor is turned off, thus reducing the output voltage to a level slightly lower than the input voltage. This maintains the constant difference between the input and output voltages, referred to as the dropout voltage.ConclusionThe S-1741C21-M5T1U4 is a three-terminal, low-dropout regulator that offers high power efficiency and precision output voltage regulation. It can be used in a range of applications, including mobile phones, PDAs, and automotive electronics. It utilizes a feedback loop to maintain a constant input-to-output voltage, or dropout voltage.

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