Current - Output:	200mA
Supplier Device Package:	SC-82AB
Package / Case:	SC-82A, SOT-343
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Protection Features:	Overcurrent, Thermal Shutdown
Control Features:	Enable
PSRR:	--
Current - Supply (Max):	1.35µA
Current - Quiescent (Iq):	100nA
Series:	S-1313
Voltage Dropout (Max):	0.32V @ 100mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.1V
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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Introduction

PMIC（Power Management ICs） is a device used to manage the power in electronic systems and components. Voltage Regulators are one of the types of such ICs, used to regulate and control a steady output voltage from a power source despite the input variations. Linear Voltage Regulators, in particular, provide continuous output voltage using a linear principle, which is generally a more efficient alternative compared to its counterpart, the Switching Voltage Regulators. The S-1313A31-N4T1U3 is a 3-terminal, ultra-low-dropout positive linear voltage regulator IC from Sanken designed specifically for 4.5V to 5.5V input voltage and is capable of providing output voltages up to 5.0V with very low dropout voltage. In this article, we will explore the application field and working principle of the S-1313A31-N4T1U3.

Application Field

The S-1313A31-N4T1U3 is suitable for a wide range of consumer and industrial applications, such as wireless communication, audio/visual devices, and embedded systems. It is specifically optimized for use in battery-powered devices, where the circuit draws power from a single lithium cell, or small battery banks, due to its small power consumption and and a very low standby current of 1µA.The S-1313A31-N4T1U3 accepts an input voltage of 4.5V to 5.5V, making it a viable choice for use in circuitry that relies on a variety of types of batteries, ranging from Li-Ion, NiMH, Li-Poly, Alkaline, and other compatible types. It is capable of providing an output voltage up to 5.0V with an ultra-low dropout voltage of 180mV, making it an attractive solution for applications that require higher output voltage than comparable devices.The S-1313A31-N4T1U3 also contains a wide variety of protection features, such as current-limiting and over-temperature protection that can help minimize damage due to unexpected fault conditions. Moreover, the normal quiescent current of the S-1313A31-N4T1U3 is only 2mV, making it a cost-effective and efficient choice for use in low-power applications.

Working Principle

The S-1313A31-N4T1U3 is a 3-terminal positive linear voltage regulator, with a fixed output voltage of 5.0V. This IC uses a linear regulation technique, which means it adjusts the output voltage in incremental steps that are dependent on the specified reference voltage. It works by comparing the voltage at the input to a fixed reference voltage (Vref) and then adjusts the resistance of a resistor array accordingly.Essentially, this IC uses a simple current-mirror circuit, where the voltage is fed into the non-inverting input of a comparator and is compared to the reference voltage Vref. If the input voltage is higher than the reference voltage, then the voltage across the emitter-collector circuit is increased in order to reduce the voltage at the output. This works in the opposite direction too, where if the input voltage is lower than the reference voltage, then the voltage across the emitter-collector circuit is reduce in order to increase the voltage at the output.The S-1313A31-N4T1U3 is also equipped with a built-in PD control function that allows it to keep the output voltage in a range within a certain region around the specified reference voltage. This PD control function keeps the output voltage relatively stable, despite variations in the input voltage, thereby allowing the IC to regulate the output voltage in a more efficient manner.

Closing Remarks

The S-1313A31-N4T1U3 is a low-power, ultra-low-dropout linear voltage regulator IC from Sanken, designed specifically for 4.5V to 5.5V input voltage and is capable of providing output voltages up to 5.0V. It is suitable for a wide range of consumer and industrial applications due to its low power consumption, very low standby current, and robust protection features. The S-1313A31-N4T1U3 uses a linear regulation technique, which means it adjusts the output voltage in incremental steps that are dependent on the specified reference voltage. Additionally, the PD control function within the IC helps to keep the output voltage relatively stable despite variations in the input voltage.

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