TPS76330QDBVRG4Q1

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General Description

TPS76330QDBVRG4Q1 is an advanced small package, low-noise linear voltage regulator, designed to operate in the wide 2.9V-7.5V input voltage range. This device can supply up to 300mA output current and it features a power-saving sleep mode and very low quiescent current. It also features a high voltage threshold reset output, thermal shutdown and current limit protection.

Application Field

The TPS76330QDBVRG4Q1 is well-suited for almost any voltage-regulation application requiring low-dropout operation and low output noise. Such applications include communications systems like Ethernet, Wi-Fi and DSL; computer systems, including embedded microprocessors, desktop and laptop computers; consumer electronics like audio systems, HDTVs, Smartphones, and Tablet PCs; and industrial, medical, and military applications.

Features

• Input voltage range of 2.9V–7.5V
• Low shutdown current (<1 μA)
• Low-noise operation
• 50mA minimum output current
• Adjustable operating voltage
• Output voltage accuracy of 1.5%
• Output cutoff delay time adjustable
• Input voltage noise reduction
• Thermal protection circuit
• Soft start circuit

Working Principle

The TPS76330QDBVRG4Q1 is a linear voltage regulator that operates by converting the input voltage to a stable output voltage. It works by using a voltage reference, an operational amplifier, a transistor, a PNP transistor, and an error amplifier module. The voltage reference provides a stable voltage reference that the output voltage of the device is regulated to. The operational amplifier compares the voltage of the voltage reference to an error voltage provided by the error amplifier module. If the voltage reference voltage is greater than the error voltage, the output of the operational amplifier will be low and the PNP transistor will be switched off, stopping current flow to the load. When the reference voltage is lower than the error voltage, the output of the operational amplifier will be high and the PNP transistor will be on, which will allow current to pass to the load. The error amplifier module senses the output voltage of the device and adjusts the offset voltage to keep the output voltage at the value specified by the user.

The TPS76330QDBVRG4Q1 also includes an input voltage noise reduction circuit which helps to reduce the noise level at the output of the regulator. This noise reduction circuit is composed of input voltage noise reduction resistors, a power MOSFET, an LC filter, and an adjustable oscillator. The resistors are connected between the input of the regulator and ground and attenuate noise at frequencies above a few hundred hertz. The MOSFET switches in and out of the circuit to reduce large noises. And the LC filter further reduces noise. The adjustable oscillator is used to control the frequency of noise reduction circuit.

The TPS76330QDBVRG4Q1 also features output voltage cutoff delay that allows the regulator to wait for a predefined amount of time before turning off the output voltage. This helps smooth out power on and off transients. The thermal protection circuit prevents the device from triggering an overtemperature shutdown. The soft start circuit ensures that the output voltage rises slowly from a lower value to its expected level to prevent over-current buildup.

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