S-1137B20-U5T1U

Current - Output:	300mA
Supplier Device Package:	SOT-89-5
Package / Case:	SOT-89-5/6
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Over Current
Control Features:	Enable, Soft Start
PSRR:	70dB (1kHz)
Current - Supply (Max):	65µA
Current - Quiescent (Iq):	1µA
Series:	S-1137
Voltage Dropout (Max):	0.38V @ 300mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2V
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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Introduction

The S-1137B20-U5T1U is an ultra-low-power, 5-volt linear voltage regulator. It is a monolithic IC with an integrated output transistor, enabling a compact and low profile solution with high efficiency. The S-1137B20-U5T1U is an ideal choice for systems consuming up to 1.5mA of current, offering protection from output and input overvoltage, current limiting, and thermal shutdown.

Application Field

The S-1137B20-U5T1U is widely used in consumer electronics, such as smartphones and other portable and wearables devices, due to its low-power characteristics. It’s also used in automotive applications, especially those requiring low-voltage, precision regulation and high efficiency over a wide input range.The S-1137B20-U5T1U is also well-suited for other applications that require a 5-volt output at low current consumption, such as powering medical equipment, home automation systems, and other industrial automation systems. Additionally, its high temperature operation (up to 125°C) allows it to be used in harsh environments.

Working Principle

The S-1137B20-U5T1U is a linear voltage regulator, which uses an internal series pass voltage-regulating circuit to maintain a constant output voltage. Its input voltage must be higher than the output voltage for the regulator to work properly. It consists of an internal error amplifier, an R-C output network, and an output transistor.The error amplifier compares the feedback voltage, coming from the R-C output network, to an internal reference voltage. When the two voltages are not equal, a current is amplified and applied to the output transistor, which limits the voltage across the load. The regulator will then adjust the output voltage until the two voltages are equal.The S-1137B20-U5T1U also features several protection features. Its current limit protects against overloading, while the thermal shutdown feature prevents the regulator from overheating. Its input overvoltage protection prevents excessive currents from entering the device, and the output overvoltage protection prevents the output voltage from exceeding the specified values.

Conclusion

The S-1137B20-U5T1U is a low-power, 5-volt linear voltage regulator, with an integrated output transistor and several protection features. It is used in a wide range of applications, from consumer electronics to industrial automation systems, and is especially suited for systems that require low voltage and high efficiency. Its working principle is based on a series pass voltage-regulating circuit, which uses an internal error amplifier to compare the feedback voltage to an internal reference voltage and adjust the output voltage to maintain a constant output.

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