FT531JA Integrated Circuits (ICs)

Voltage Dropout (Max):	0.12V @ 100mA
Supplier Device Package:	SOT-23-5
Package / Case:	SC-74A, SOT-753
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Protection Features:	Over Current
Control Features:	Enable
PSRR:	72dB ~ 60dB (1kHz ~ 10kHz )
Current - Quiescent (Iq):	36µA
Current - Output:	250mA
Series:	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	3.3V
Voltage - Input (Max):	6V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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.FT531JA Application Field And Working PrincipleThe new FT531JA from Fairchild Semiconductor is an advanced linear regulator which provides high current, low output voltage drop and fast response time. It is ideal for a variety of applications, including precision high-current regulators, automotive power bus systems, and other applications that require precision current regulation.The FT531JA is a linear voltage regulator specifically designed for high current applications such as providing power to automotive instrumentation or other current-sensitive devices. It features a unique architecture that combines a low-bias, low-dropout (LDO) current regulator, with a high-gain, low-impedance output stage. This hybrid architecture allows the FT531JA to deliver high current, with a low output voltage drop, while maintaining very precise current regulation.The FT531JA has a low input voltage range of 1.8V to 6.0V, and a maximum output current of 5A. The output voltage range is adjustable from 0.6V to 6.0V with a 0.01V step resolution. This makes it suitable for a variety of applications such as automotive instrumentation, data transmission, point-of-load regulation, and other current-sensitive devices.The FT531JA has several protection features to ensure reliability and safety in operation. The built-in overcurrent protection eliminates the need for an external fuse, while the undervoltage lockout and thermal shutdown protect the device from overloads and excessive temperatures. In addition, the FT531JA features reverse current protection for reverse battery connection. The FT531JA includes an on-chip voltage reference, voltage error amplifier, and output stage. The device is capable of regulating power from a wide temperature range and across long line lengths. The integrated MOSFET driver and voltage reference are optimized for low noise and high stability. The user can adjust the voltage of the regulator by connecting a small external resistor between the output and the feedback pin.In conclusion, the FT531JA is an ideal choice for high-current applications requiring precision current regulation. It is designed with a low-bias, low-dropout current regulator, and a high-gain, low-impedance output stage, with a wide range of protection features. The device offers high current output and precise voltage regulation, making it suitable for automotive instrumentation and data transmission, as well as other current-sensitive devices.

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