S-1206B18-U3T1U

Voltage Dropout (Max):	0.5V @ 100mA
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:	--
PSRR:	--
Current - Quiescent (Iq):	1.5µA
Current - Output:	250mA
Series:	S-1206
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	6.5V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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IntroductionThe S-1206B18-U3T1U is a low-noise linear voltage regulator, designed to provide up to 3A of output current with good thermal stability. It is used in a wide range of applications, from networking and communications power supplies to military and industrial installations.This Voltage Regulator is designed to provide a stable output voltage with excellent regulation performance over a wide output voltage range (1.5 to 18V). The output voltage is adjustable with an external resistor and the adjustment range is from 0.5 to 18.5V.The S-1206B18-U3T1U has low noise performance compared to other linear voltage regulators. It can generate a low output voltage noise of <6μVrms@20kHz. This makes the S-1206B18-U3T1U suitable for applications requiring low-noise power supplies, such as data acquisition and precision control systems.Application FieldThe S-1206B18-U3T1U is a low-noise Linear voltage regulator which is widely used in various applications. Due to its low noise performance, it is well suited for applications requiring low-noise power supplies, such as data acquisition and precision control systems. Some of the applications for the S-1206B18-U3T1U are:

• Networking and Communications Power Supplies
• Telephone Exchange and PBX Power Systems
• Data Acquisition Systems
• Precision Control Systems
• Industrial and Commercial Controllers
• Automation and Measurement Systems
• Military and Aerospace Power Systems

Working PrincipleThe S-1206B18-U3T1U includes an internal linear voltage regulator that is able to provide up to 3A of output current. It is based on a buck topology with an internal voltage reference. A control loop is used to maintain the output voltage at the programmed value, by controlling the current in the power switch.The regulation loop of the S-1206B18-U3T1U is based on an error amplifier with a differential input. The error amplifier is connected to a reference voltage(Vref) generated internally by a precision band-gap reference, and to the output voltage. The difference between the Vref and the output voltage is amplified and feeds back to the power switch, controlling its current.The internal voltage reference is fine-tuned with the ADJ pin. The output voltage can be adjusted with an external precision resistor from 0.5 to 18.5V. The output current of the regulator can be set using a current limit resistor connected between the sense resistor (RSEN) pin and ground, or by setting the soft-start (SS) time with an external capacitor.ConclusionThe S-1206B18-U3T1U is a low-noise linear voltage regulator which is widely used in various applications, from networking and communications power supplies to military and industrial installations. It is designed to provide a stable output voltage with excellent regulation performance over a wide output voltage range (1.5 to 18V). The regulator is based on an internal linear voltage regulator, an error amplifier connected to a reference voltage, and control loop. The output voltage can be adjusted with an external precision resistor from 0.5 to 18.5V, and the output current can be set using a current limit resistor or the soft-start time with an external capacitor.

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