RT9053AZQW

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PMIC - Voltage Regulators - Linear

Linear voltage regulators are an important class of voltage regulating components that derive their output voltage from a stable fixed reference voltage. The RT9053AZQW is a linear general purpose voltage regulator using a CMOS power devices and featuring adjustable output voltage and over-temperature protection in an ultra-small package. This voltage regulator’s low power consumption makes it ideal for battery-powered or other portable applications.

Applications

The RT9053AZQW’s versatility makes it suitable for a wide range of applications including those where space is at a premium. The high level of integration of the RT9053AZQW helps reduce parts count and improve system reliability in battery-powered gadgets such as tablets, smart phones, wearables and industrial/medical equipment. It is also well suited for automotive, avionics, telecommunications and computing applications.

Features

• High accuracy of output voltage: ±2%
• Advanced bi-stable CMOS technology
• Wide input voltage range: 2.7 V to 5.5 V
• Low output voltage drop-out voltage (V_drop) and low quiescent current: 95mV @ 10mA
• Wide operating temperature range: From -40°C to 125°C
• Integrated over-temperature protection (OTP) and over-current protection (OCP)
• Ultra small package: SOT-23-5 package

Working Principle

This linear voltage regulator works according to an error amplifier control method. It detects the output voltage and compares it with the reference voltage and generates an error signal. This error signal is amplified and applied to a series pass transistor which controls the output voltage. This pass transistor is a bipolar junction transistor (BJT). When the output voltage is too high the error signal will cause the BJT to reduce the current in the output voltage source, thus causing the output voltage to decrease. Likewise, when the output voltage is too low the error signal will cause the BJT to increase the current in the output voltage source, thus causing the output voltage to increase.

In order to protect the device from over-currents, the RT9053AZQW uses an over-current protection circuit. This over-current protection circuit has two components; an over-current detect circuit and a latch circuit. The over-current detect circuit monitors the output current and generates a signal when the current exceeds the set threshold. This signal is then latched by the latch circuit and the output voltage is set to its minimum value.

The RT9053AZQW also has an integrated over-temperature protection (OTP) circuit for when the output temperature rises above the set threshold. The OTP circuitry shuts down the device when the temperature crosses the threshold and requires manual reset before normal operation can resume.

Conclusion

The RT9053AZQW is an ideal linear voltage regulator for any application where space is of the essence. Its features such as enhanced output accuracy and a wide input voltage range make it particularly capable of providing reliable power to battery-powered devices and other portable applications. The integrated over-current and over-temperature protection circuits add an extra layer of protection against potential over-voltage and over-current issues. The small size and low power consumption of the RT9053AZQW make it a popular choice among product designers.

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