LP3855ET-2.5

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LP3855ET-2.5 Application Field and Working Principle

LP3855ET-2.5 is a low dropout linear regulator integrated circuit (IC) manufactured by Texas Instruments. It conforms to the Low Dropout (LDO) regulator specifications and is intended primarily for power supply applications. This device is designed to provide a regulated output voltage with very low quiescent current and low dropout voltage.

Classification as PMIC - Voltage Regulators - Linear

LP3855ET-2.5 belongs to the category of Voltage Regulators and further to the subcategory of Linear Voltage Regulators within Power Management ICs (PMICs). PMICs, short for power management integrated circuits, are integrated circuits (ICs) that manage and regulate the power supply and consumption of electronic systems and components. They are sometimes referred to as power scheduling controllers (PSCs). They enable the efficient distribution of power from the power source to the working environment.

LP3855ET-2.5 Features and Benefits

The LP3855ET-2.5 voltage regulator IC offers the following features and benefits:

• Low dropout voltage (600mV at 1A)
• Low quiescent current (8 μA at no load)
• High power dissipation (1.2W)
• Output current of up to 2.5A (3A max. peak)
• Flexible output voltage range of 0.8V to 5.5V
• Thermal shutdown protection
• Fast turn-on and response time

LP3855ET-2.5 Application Fields

The LP3855ET-2.5 voltage regulator IC is suitable for a wide range of applications that require a low dropout voltage and low quiescent current. These applications include, but are not limited to:

• Portable and handheld devices
• Battery powered systems
• AV receivers
• Digital media players
• GPS navigation devices

Working Principle

The LP3855ET-2.5 is a low dropout linear voltage regulator based on the standard linear regulator architecture. The basic principle of operation of a linear regulator is that the input voltage is applied to the pass transistor, which regulates the output voltage. When the voltage on the input varies, the pass transistor adjusts its operation to maintain a constant regulated output voltage. The pass transistor is controlled by an error amplifier, which compares the voltage at the output to a reference voltage (Vref) generated by the internal circuit. When the output voltage is higher than the reference voltage, the error amplifier lowers the base of the pass transistor, thus reducing the current flowing through it and hence the output voltage. Conversely, when the output voltage is lower than the reference voltage, the error transistor increases the output current, thus increasing the output voltage.

Conclusion

LP3855ET-2.5 is a low dropout linear voltage regulator IC manufactured by Texas Instruments. This device is designed to provide a regulated output voltage with very low quiescent current and low dropout voltage and is suitable for a wide range of applications. It conforms to the Low Dropout (LDO) regulator specifications and is part of the Voltage Regulator subcategory within Power Management ICs (PMICs).

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