L4957AD1.8TR

Current - Output:	5A
Base Part Number:	L4957A
Supplier Device Package:	D2PAK
Package / Case:	TO-263-3, D²Pak (2 Leads + Tab), TO-263AB
Mounting Type:	Surface Mount
Operating Temperature:	0°C ~ 125°C
Protection Features:	Over Temperature, Short Circuit
Control Features:	--
PSRR:	75dB (120Hz)
Current - Quiescent (Iq):	2mA
Series:	--
Voltage Dropout (Max):	--
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	1.8V
Voltage - Input (Max):	14V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The L4957AD1.8TR is a low dropout linear regulator designed for providing regulated power supplies for low power microelectronic systems and applications. It is a low-cost, reliable and high-performance alternative to external voltage regulators. Its maximum output voltage is adjustable from 1.2V to 1.8V and can support up to 650mA of continuous output current. The device is protected from overtemperature conditions and it also has both a current limit protection and a thermal shutdown protection

Application Field

The L4957AD1.8TR is designed for providing regulated power supplies for low power microelectronic systems and applications. It can be used in many digital and analog circuits such as LCD display panels, logic voltage level shifters, motor controllers and digital logic drivers. The device can be used in a wide variety of applications that require low-noise and clean power. In addition, it can also be used in battery-powered applications where it can be used to maintain a steady voltage level while providing current limiting and thermal protection

Working Principle

The L4957AD1.8TR uses a low-dropout (LDO) linear regulator circuit. The LDO regulator consists of an error amplifier, a voltage reference and a p-channel MOSFET pass element. The input voltage is applied to the gate of the pass element which regulates the output voltage. The error amplifier compares the output voltage to the reference voltage and controls the gate voltage of the pass element accordingly. In order to provide current limiting and thermal protection, the device is designed with a power supply over-voltage protection and an over-temperature shutdown circuit.

Advantages

The L4957AD1.8TR has the following advantages: - Low dropout voltage: The device has a low dropout voltage, which allows it to maintain a regulated output voltage even when the input voltage is lower than the output voltage.- Low quiescent current: The quiescent current of the device is 1mA, which makes it suitable for low power applications. - Low noise: The device offers low noise operation, which helps to reduce noise and ensure accuracy. - Over temperature and short circuit protection: The device has both a short circuit protection and an over temperature protection, which helps to prevent damage to the device in case of excessive stress. - Flexible output voltage: The device can be adjusted from 1.2V to 1.8V and can support up to 650mA of continuous current.

Conclusion

The L4957AD1.8TR is an excellent choice for low power microelectronic systems and applications and is designed to provide excellent low-noise and clean power. With its adjustable output voltage, low dropout voltage, low quiescent current and short circuit protection, it offers a highly reliable solution that can be used in many applications.

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