L4931CPT120-TR

Current - Output:	250mA
Base Part Number:	L4931C
Supplier Device Package:	PPAK
Package / Case:	TO-252-5, DPak (4 Leads + Tab), TO-252AD
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	64dB ~ 55dB (120Hz ~ 10kHz)
Current - Supply (Max):	7mA
Current - Quiescent (Iq):	1.6mA
Series:	--
Voltage Dropout (Max):	0.8V @ 250mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to L4931CPT120-TR

The L4931CPT120-TR is a low dropout (LDO) voltage regulator with a wide range of applications and a long operating lifetime. It can be used to regulate the output of one or more DC/DC converters, to regulate an AC/DC power supply, and even to regulate a battery charge. It is a Linear Regulator type of voltage regulator, providing a constant and low-noise output voltage.

Working principle

This device mainly consists of a transistor, a comparator, a resistive feedback network, and two series diodes. A voltage reference input is connected across the base and emitter of the transistor and a feedback loop is connected between the output and the non-inverting input of the comparator. When the output voltage drops below the reference voltage, the comparator output switches low turning on the transistor and diverting some source current to the output. At the same time, the feedback voltage increases, preventing the transistor from turning off. As a result, the output voltage is regulated to a constant value.The resistive feedback network provides stability to the device and controls the self-heating generated by the transistor.

Applications

The L4931CPT120-TR is designed for wide range DC/DC applications, allowing for efficient operation in harsh conditions such as temperature, humidity, dust, and overvoltage.It is suitable for applications such as:- Automotive: dashboard, infotainment systems- Battery-powered devices: smartwatches, tablets- Industrial equipment: motion controllers - Handheld consumer electronics: MP3 players- LED lighting

Advantages

The L4931CPT120-TR has the following advantages:- Low dropout voltage- Low noise output- High temperature performance- High power density- Low quiescent current- Low output voltage ripple- High accuracy

Conclusion

The L4931CPT120-TR is a Linear Regulator type voltage regulator designed for wide range DC/DC applications. It features a low dropout voltage and low noise output, making it well suited for automotive, battery-powered, industrial, and handheld consumer electronics applications. It also has a high power density and low quiescent current, and offers high accuracy and temperature stability.

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