LF25CV

Current - Output:	500mA
Base Part Number:	LF25
Supplier Device Package:	TO-220AB
Package / Case:	TO-220-3
Mounting Type:	Through Hole
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	82dB ~ 65dB (120Hz ~ 10kHz)
Current - Supply (Max):	12mA
Current - Quiescent (Iq):	1mA
Series:	--
Voltage Dropout (Max):	0.7V @ 500mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	2.5V
Voltage - Input (Max):	16V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tube

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Introduction

The LF25CV is a linear voltage regulator designed to provide power supply circuits with stable and accurate voltage outputs, a converted supply voltage and an adjustable current limit. The LF25CV, available in both positive and negative output versions, is an economical solution when a simple, integrated, low-cost and high-accuracy regulator is needed.

Application Field

The LF25CV linear voltage regulator is mainly used in a variety of electronic applications. By supplying a stable and accurate output voltage, the regulator can be used in automotive electronics, battery chargers, computer peripherals, industrial systems, cellular and wireless systems, and data acquisition equipment. The LF25CV is also used in automotive audio systems, medical and commercial equipment, as well as in a variety of medical and industrial instruments.

• Low-cost and high-accuracy regulator
• Low-noise and low-current consumption
• Thermal and current protection capacities
• High tolerance to sudden voltage changes
• Wide input voltage range 4.5~28V
• Low dropout voltage
• Fast response time
• Integrated adjustable current limit

Working Principle

The basic function of the LF25CV is to regulate the output voltage to a fixed value in spite of changes in the output load and input voltage. The LF25CV features an integrated circuit with a voltage reference, an error amplifier, a pass transistor and a series pass element. The output of the internal voltage reference module is compared with the voltage of the output pass element, which is pushed through the pass transistor. The result of this comparison is the input to the error amplifier module. This module produces an output signal that is fed to the base terminal of the pass transistor. It corrects the current of the pass transistor at the base so that the regulated voltage remains constant even if particulars such as the output current and the input voltage change.The output current of the LF25CV can be limited with an external resistor. When the current passes from the output terminal to the ground reaches the set current limit, the voltage of the current limiting resistor goes lowers, recucing the gain of the error amplifier and turn into the linear region decreasing the output current. The LF25CV also features protection against thermal and over current overload conditions. If a thermal or overload overload situation occurs, the regulator interrupts its operation until the fault condition is removed and the circuit returns to normal operation.

Conclusion

The LF25CV is a low-cost and high-accuracy linear voltage regulator available in both positive and negative output versions. With features such as low-noise, low-current consumption, high tolerance to sudden voltage changes, wide input voltage range, low dropout voltage, and fast response time, the LF25CV is ideal for use in automotive electronics, battery chargers, computer peripherals, industrial systems, cellular and wireless systems, and other data acquisition equipment. In addition, the LF25CV provides integrated adjustable current limit and protection against thermal and over current overload conditions.

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