RT9011-CQGQW

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Introduction

The RT9011-CQGQW is a low dropout (LDO) linear regulator from Richtek Technology Corp. It is designed to provide a regulated output voltage for demanding applications requiring high accuracy and low noise. The rich features of this low-noise LDO help to ensure a stable and precise output voltage in the most challenging applications. The regulator provides a very low output noise, fast transient response, high efficiency, excellent lineand load regulation, and short-circuit protection. With an input voltage range of 0.8V to 5.5V, the RT9011-CQGQW is suitable for low-voltage applications such as portable electronics, battery-powered applications, and automotive systems.

Application Field

The RT9011-CQGQW LDO regulator is ideal for applications requiring a low input-to-output voltage drop and tight output voltage tolerance. Examples include battery management systems; LED lighting and display applications; tablets, PDAs, and other handheld devices; audio amplifiers and power supply systems; automotive systems; and power converters, including those used in mobile telecommunication base stations.

The RT9011-CQGQW is the perfect choice for when conditions require an ultra-low-noise LDO and high output accuracy. It combines very high accuracy with a very wide voltage output range, allowing the user to get high accuracy at very low as well as higher inputs and outputs. Further, the device also has a very low operating quiescent current and low output noise, making it perfect for both automotive and battery-powered applications.

Features

-High efficiency allows up to 3A load current operation
-Off-Current: 40uA average
- Low Output Noise: 10µV/V (3v IN, 1.2V OUT, 10mA load)
- Input Voltage Range: 0.8V -5.5V
- Output Voltage Accuracy: ±1.5%
-Line Regulation: 0.2%
-Load Regulation: 0.2%
-Current Limit Protection: Overload and Short Circuit
- Under-Voltage Lockout (UVLO)
- Thermal Shutdown: -40°C to 125°C
-Over-Temperature Protection
- Automatic Output Discharge

Working Principle

The RT9011-CQGQW is a low dropout (LDO) linear regulator. It uses a voltage divider-based feedback circuit to measure the output voltage and compares it to a reference. When the output voltage drops due to a load increase, the error amplifier increases the current flow through the pass transistor resulting in an increase in the output voltage. Similarly, when the output voltage rises due to a decrease in load, the error amplifier reduces the current flow through the pass transistor resulting in a decrease in the output voltage. The regulator maintains a constant output voltage by constantly adjusting the current flow through the pass transistor. The output voltage can be adjusted by varying the voltage divider ratio.

The RT9011-CQGQW has several features to protect the circuit from overload and short circuit conditions. The device has an under-voltage lockout (UVLO) circuit to ensure that the LDO will not operate when the input voltage is too low. The device also has an over-temperature protection (OTP) circuit which shut downs the output voltage when the temperature of the device exceeds a certain limit. The device also has an automatic output discharge circuit that discharges the output capacitor when the LDO is disabled.

The RT9011-CQGQW can also be used as a power switch, with a low on resistance of 0.2Ω and a maximum load current of 3A. It can be used to switch power between two nodes, with the regulator enabled when the voltage across the two nodes is more than a preset threshold.

In summary, the RT9011-CQGQW is a low dropout linear regulator that provides a high accuracy output voltage for demanding applications requiring low noise and high accuracy. It features low noise, low quiescent current, low output voltage tolerance, fast transient response, and protection from overload, short circuit, and over-temperature conditions.

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