S-1131B29UA-N4OTFG

Current - Output:	300mA
Supplier Device Package:	SOT-89-3
Package / Case:	TO-243AA
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Over Current
Control Features:	Enable
PSRR:	70dB (1kHz)
Current - Supply (Max):	65µA
Current - Quiescent (Iq):	1µA
Series:	S-1131
Voltage Dropout (Max):	0.34V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.9V
Voltage - Input (Max):	6.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Not For New Designs
Packaging:	Tape & Reel (TR)

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Introduction

The S-1131B29UA-N4OTFG is a linear voltage regulator specially designed for automotive and automotive-qualified applications. This voltage regulator is targeted for 12V systems, and provides one of the smallest packages for easy installation. Thanks to its low quiescent current, 75 μA Typical, it is intended for long-term endurance applications with low power dissipation. The chip also offers a guaranteed line/load regulation and fast transient response, better than 5% line/load regulation and 10μs rising/falling time. The S-1131B29UA-N4OTFG can be used to supply power to sensitive automotive ECUs, coprocessors and various microcontrollers, even in the presence of considerable ripple on the main power rail.

Application fields

The S-1131B29UA-N4OTFG is suitable for a variety of applications, but most of all it is recommended in automotive. This voltage regulator can be used not only to provide power to the main ECU, but it is also suitable for powering analog, digital and RF circuits. It can be used as a main power supply as well as a standby power supply, and can also be used to power external communications ICs, sensors and actuators. Furthermore, it also offers safe operation even in situations when the input voltage of the circuit can vary from 6V to 40V.

Working principle

The S-1131B29UA-N4OTFG operates as a linear (voltage dropout) regulator. It compares its output voltage to an internal reference voltage and drops out a fixed voltage to oppose the current. Thus, it regulates the output voltage towards the reference voltage, maintaining it as constant as possible regardless of load current or input voltage variations. The device features an overcurrent protection circuit that turns off the power to the load when it detects a short-circuit situation. Furthermore, the chip also includes a soft start feature that avoids high inrush current when the regulator is first enabled, as well as a current limit circuit to protect the device from excessive load currents.

Conclusion

The S-1131B29UA-N4OTFG linear voltage regulator is a reliable solution for automotive applications that require a low quiescent current and robust performance in diverse power conditions. This voltage regulator ensures stable voltage output and provides various protection features to ensure the safety of the overall circuit.

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