IRU1117CDTR

Current - Output:	800mA
Base Part Number:	IRU1117CD
Supplier Device Package:	D-Pak
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 150°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	70dB (120Hz)
Current - Quiescent (Iq):	10mA
Series:	--
Voltage Dropout (Max):	1.3V @ 1A
Voltage - Output (Max):	3.6V
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	7V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The IRU1117CDTR is a three-terminal adjustable voltage regulator, which is specified for output current up to 1A. It has an output voltage adjustable over the range of 1.25 to 28V and is available in TO-220 and SOT-223 packages. With its superior performance, reliability, and low power dissipation, IRU1117CDTR is one of the most popular fixed and adjustable linear voltage regulators. It also has on-chip thermal shutdown protection and short-circuits protection.

Application field

The IRU1117CDTR can be used in various applications, such as:

• Positive voltage regulator and negative voltage regulator
• Battery charger
• Programmable output voltage
• Power supply for computer
• Battery powered system
• Power supply for portable device
• Automotive electronics
• Communication systems

Working principle

The IRU1117CDTR is a three-terminal adjustable voltage regulator which works in a similar way to the three-terminal fixed voltage regulator. It consists of an error amplifier, differential amplifier, and voltage reference. The error amplifier amplifies the difference between a preset reference voltage and an externally applied voltage. The output of the error amplifier is sent to the differential amplifier which compares the voltage with a reference voltage to control the output voltage of the voltage regulator.The actual output voltage is determined by the external resistor, R1, connected between the output and adjustable pin. The fixed reference voltage is set by the voltage reference, VR, and the output voltage is adjustable by varying the resistance of R1. When considerable load current is present, a capacitor C1 is connected between the output and the adjustable pin to eliminate local oscillations.

Conclusion

The IRU1117CDTR is an adjustable linear voltage regulator suitable for use in various applications. It can provide an output voltage adjustable from 1.25V to 28V with a maximum output current of 1A. With its excellent performance, reliability, and protection features, the IRU1117CDTR could be a great solution for various power systems.

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