Series:	S-1313
Packaging:	Tape & Reel (TR)
Part Status:	Active
Output Configuration:	Positive
Output Type:	Fixed
Number of Regulators:	1
Voltage - Input (Max):	5.5V
Voltage - Output (Min/Fixed):	2.8V
Voltage - Output (Max):	--
Voltage Dropout (Max):	0.33V @ 100mA
Current - Output:	200mA
Current - Quiescent (Iq):	100nA
Current - Supply (Max):	1.35µA
PSRR:	--
Control Features:	Enable
Protection Features:	Overcurrent, Thermal Shutdown
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	4-SMD, Flat Lead Exposed Pad
Supplier Device Package:	HSNT-4-A

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Introduction

The S-1313D28-A4T1U3 is an integrated voltage regulator. It is categorized as one of the linear voltage regulators, specifically part of the PMIC (Power Management Integrated Circuit) family. The linear voltage regulator is an electronic circuit that maintains a constant output voltage, despite changes in the input voltage and significant changes in load current. This feature has made it a necessary and important element for most, if not all, power management and power supply designs.

Application Field

Linear voltage regulators, such as the S-1313D28-A4T1U3, are typically used in automotive, aviation, industrial and portable applications. When used for automotive applications, linear voltage regulators are important for controlling the power supply to various vehicle accessories, such as the headlights. In aviation, linear voltage regulators provide power stability to different systems, both in the interior and the exterior of an aircraft. Industrial applications are where linear voltage regulators are most commonly used. They are ideal for applications such as high-accuracy instrumentation and power conditioning in areas with extreme fluctuations in power supply. In portable applications, linear voltage regulators are found in some of the most commonly-used small products, such as smart phones, laptops and other portable electronic devices.

Working Principle

The S-1313D28-A4T1U3 works on the principle of controlling the output voltage to match the desired output voltage with respect to the input voltage. The most common type of linear regulator is the series-pass regulator, which operates by passing a current from an input voltage source to an output voltage load through a series element, usually a transistor. A linear regulator operates when the difference between the output and the input voltage is increased, thus causing the transistor to allow more current to flow through it. This results in a decrease in voltage at the Collector-Emitter of the transistor, and the output voltage is decreased too.The S-1313D28-A4T1U3 has two operational modes - the adjustable and fixed mode. In the adjustable mode, the output voltage is varied by changing the resistance between the control terminal and the ground. This resistance is referred to as the adjustment terminal resistance (Rv). The output voltage is also varied with respect to the input voltage, through the use of an external voltage divider network. In the fixed mode, the Rv is set and the output voltage remains fixed regardless of the input voltage.

Conclusion

The S-1313D28-A4T1U3 is an integrated voltage regulator that is an integral part of most linear voltage regulator applications. It is categorized as part of the PMIC (Power Management Integrated Circuit) family and is used in industries that require high accuracy and stability of power supply. It is commonly used in automotive, aviation, industrial and portable applications due to its ability to regulate and adjust the output voltage to match the desired output, regardless of the input voltage. The S-1313D28-A4T1U3 works on the principle of controlling the output voltage to match the desired output voltage with respect to the input voltage, using an external voltage divider network or a resistance between the control terminal and the ground.

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