S-1740G20-A4T2U4

Voltage Dropout (Max):	0.04V @ 10mA
Supplier Device Package:	HSNT-4-B
Package / Case:	4-SMD, Flat Lead Exposed Pad
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-1740
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-1740G20-A4T2U4 is a high quality, high current, low noise, programmable linear voltage regulator ideal for a variety of applications. This article will discuss the application field and working principle of the S-1740G20-A4T2U4.

Application Field

The S-1740G20-A4T2U4 is a linear voltage regulator designed for applications where a high level of current, low noise, and programmability are paramount. Capable of supplying up to 40mA of current, the S-1740G20-A4T2U4 is ideal for applications such as powering embedded systems, providing voltage regulation in analog circuits, and also supplying digital circuits with clean, steady power. As the S-1740G20-A4T2U4 is a programmable linear regulator, it is well suited for use in high-precision applications that require precise and reliable voltage regulation.

Working Principle

The S-1740G20-A4T2U4 utilizes the same proven and reliable linear regulation topology as other regulators on the market. At the heart of this regulator is a differential amplifier connected between the output voltage and a reference voltage. When the output voltage drops below the reference voltage, the amplifier turns on the pass transistor, pulling current from the power supply to the output, thus bringing the output voltage back above the reference voltage. If the output voltage is too high, the amplifier turns off the pass transistor, allowing the output voltage to drop until it once again reaches the desired output voltage. This action of the differential amplifier is what allows the PCA, or Programmable Constant Adjustment, to regulate the output voltage. The PCA feature of the S-1740G20-A4T2U4 is what enables it to be programmed, allowing the user to select any output voltage between 1.2V and 30V with a resolution of 25mV. The PCA can be programmed through the use of a digital potentiometer, such as the DigiPot20. The PCA is also capable of being adjusted through the usage of an external reference, allowing the user to select any voltage reference available in the market. The S-1740G20-A4T2U4 also features a low-noise and low-dropout design, allowing it to maintain a very steady and precise output voltage even at very low input voltage levels. This is particularly useful for applications where the input voltage levels may vary or drop significantly over time.

Conclusion

The S-1740G20-A4T2U4 is an ideal linear voltage regulator for a variety of applications. Its high current and low noise design, combined with its programmable PCA makes it a powerful and reliable solution for providing precise and steady power to embedded systems and analog circuits. The ability to set the output voltage through either an external reference or a digital pot make this linear regulator a versatile, reliable, and precise solution for powering a wide variety of devices.

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