CAT6219ADJTD-GT3

Current - Output:	500mA
Base Part Number:	CAT6219
Supplier Device Package:	TSOT-23-5
Package / Case:	SOT-23-5 Thin, TSOT-23-5
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature, Under Voltage Lockout (UVLO)
Control Features:	Enable
PSRR:	64dB ~ 54dB (1kHz ~ 20kHz)
Current - Supply (Max):	90µA
Current - Quiescent (Iq):	75µA
Series:	--
Voltage Dropout (Max):	0.5V @ 500mA
Voltage - Output (Max):	5V
Voltage - Output (Min/Fixed):	1.25V
Voltage - Input (Max):	5.5V
Number of Regulators:	1
Output Type:	Adjustable
Output Configuration:	Positive
Part Status:	Active
Packaging:	Tape & Reel (TR)

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CAT6219ADJTD-GT3 Application Field and Working Principle

Introduction

The CAT6219ADJTD-GT3 is a linear voltage regulator from ON Semiconductor’s CAT62x family of voltage regulators. It is a highly efficient, low-power, low-dropout regulator optimized for applications that require low-voltage step-down output levels. The CAT6219ADJTD-GT3 is available in the TO-220-5, the MSOP-8, and the TO-251-8, and operates within an input voltage range of 3.1V to 18V. The maximum output current that can be supplied is 250mA.

Application Field

The CAT6219ADJTD-GT3 is typically used in applications such as digital cameras, gaming systems, portable audio and video players, cellular phones, PDAs, and other battery-operated equipment for generating regulated 5V, 3.3V and 1.8V outputs. Other applications include powering CD-ROM drives, audio amplifiers and power DC/DC converters.The low dropout voltage also enables the CAT6219ADJTD-GT3 to provide tight regulation of output current for a wide range of battery-operated products, saving valuable board space and reducing overall power dissipation. The tight voltage regulation makes it a suitable option for small form factor digital cameras that require low noise levels while taking pictures.

Working Principle

The CAT6219ADJTD-GT3 is a linear voltage regulator that controls the output voltage using a feedback loop. With the feedback loop principle, the output voltage is regulated by controlling the on and off times of an internal pass transistor.The average output voltage is a function of the input voltage, the output current and the feedback voltage of the CAT6219ADJTD-GT3. The feedback voltage is maintained constant by the internal error amplifier and a feedback resistor, when the output voltage is higher than the desired voltage, the internal error amplifier reduces the magnitude of the digital signal that controls the on/off times of the pass transistor, reducing the output current and regulating the output voltage.The CAT6219ADJTD-GT3 features an input voltage range of 3.1 V to 18 V, making it suitable for different types of supplies. The maximum output current of 250mA also makes it suitable for increasing the power of difficult-to-drive devices. The CAT6219ADJTD-GT3 is available in TO-220-5, MSOP-8 and TO-251-8 packages that provide great versatility when considering the application requirements.

Conclusion

The CAT6219ADJTD-GT3 is an efficient, low-power and low-dropout voltage regulator that is ideal for battery-operated applications such as digital cameras, gaming systems, portable audio/video players, cellular phones and PDAs. It operates within an input voltage range of 3.1V to 18V, and provides up to 250mA output current. The feedback voltage is regulated by an internal error amplifier and a feedback resistor, allowing the user to control the output voltage of the regulator. The CAT6219ADJTD-GT3 is available in TO-220-5, MSOP-8, and TO-251-8 packages to provide design flexibility for applications.

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