REG1117A-1.8G4

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Introduction

The REG1117A-1.8G4 is a low-dropout linear voltage regulator that operates over an input voltage range of 2.7V to 5.5V while providing a regulated output voltage of 1.8V. It is designed to deliver a constant output voltage at a wide range of operating conditions, including input voltages as low as 2.7V and loads up to 200mA. The REG1117A-1.8G4 is ideal for applications that require low-noise, efficient power supplies.

Application Field

The REG1117A-1.8G4 is suitable for a variety of applications including:

• Portable and mobile electronics
• Battery powered equipment
• Automotive systems
• Telecommunications
• Consumer electronics
• Wireless systems
• Networking
• Medical equipment
• Industrial control systems

Features

The REG1117A-1.8G4 offers the following features:

• Low-dropout voltage: 1.2V at 200mA
• Floating channel for high PSRR
• Low quiescent current: 2.3mA
• Output current up to 200mA
• Stable with 1μF ceramic output capacitor
• Reverse current protection
• Thermal shutdown and current limit protection
• Built-in bias voltage ramp generator
• Built-in logic enable input with logic ground shutdown capability
• Output voltage accuracy of ±2%
• High power supply rejection ratio of 70dB

Working Principle

The REG1117A-1.8G4 employs an advanced voltage regulator topology that features a low-dropout voltage, a high switching frequency, a low ripple noise and a fast transient response. It utilizes an internally compensated error amplifier as the primary feedback control element. The output voltage is set with two external resistors of the same value, R1 and R2. The output voltage is programmed by connecting R1 and R2 to a reference voltage. The current-mode control regulates the output voltage drop across R1 and R2, ensuring a low-dropout voltage with less internal power dissipation.

The device includes a bias voltage ramp generator, which ramps up the bias voltage slowly during startup, thus reducing start-up current and stabilizing the output during the initial phase. The bias voltage ramp generator causes the reference voltage to drop during startup and ensures that the output voltage remains constant during load transients and load step changes. In addition, the REG1117A-1.8G4 includes an output short-circuit protection circuit and a thermal shutdown protection circuit to further ensure reliability and safety.

Conclusion

The REG1117A-1.8G4 linear voltage regulator offers a wide range of features, including a low-dropout voltage, low quiescent current, reverse current protection, thermal shutdown and current limit protection, and a high PSRR. These features make the REG1117A-1.8G4 ideal for applications that require low-noise, efficient power supplies. It is suitable for a variety of applications including portable and mobile electronics, automotive systems, telecommunications, consumer electronics, and more.

The specific data is subject to PDF, and the above content is for reference