TPS7225QDR

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TPS7225QDR Application Field and Working Principle

The TPS7225QDR is a step-down linear voltage regulator (LDO) developed by Texas Instrument (TI). It is commonly used in the fields of CPU voltage regulation, battery charge management and other power management applications. It is a low dropout (LDO) type LDO with low noise and low power consumption.

Key Features of the TPS7225QDR

• Very low dropout voltage, typically as low as 240mV at full load
• Fixed output voltage of 1.0V with 0.5V increments up to 5.0V
• 400mA output current capability
• Fast transient response of 2µs
• High power supply rejection ratio (PSRR)
• Programmable enable/disable of output
• Integrated reverse current protection

Applications of the TPS7225QDR

The TPS7225QDR is widely used in various applications, including:

• Mobile phones, PDAs, and digital still cameras
• SOHO/SMB routers, switches, and access points
• Industrial process control systems
• Auto PC and instrumentation systems
• Medical diagnostic and imaging systems

Working Principle

The TPS7225QDR includes a reference voltage, an error amplifier, a comparator, a divider, an output driver, and an over-current protection circuit. Depending on the input voltage, an output voltage is generated, that is, a voltage drop is generated between the output and the input terminals.

The essential function of the TPS7225QDR is the generation of a regulated voltage output from a varying input voltage supply. The linear regulator obtains its reference voltage from an external resistor divider and by amplifying the difference between the control and the reference, regulating the output voltage to a fixed setting. The divider delivers a fixed reference voltage to the negative input of the error amplifier, which compares the voltage of the output terminal to that of the reference and provides an error voltage.

The output driver is responsible for supplying the correct current to the output, making sure that the required output voltage is achieved. In order to avoid oscillation and oscillation related problems, the error amplifier has a loop compensation network. The over-current protection circuit, which includes an over-current detection pin, helps to further protect the circuit against high currents and voltage transients.

The power supply rejection ratio (PSRR) of the TPS7225QDR is excellent, and it provides very low noise and ripple. This makes it an ideal choice for applications requiring low noise and high power supply rejection ratio.

Conclusion

The TPS7225QDR is a linear voltage regulator which is ideal for use in many applications requiring low noise and high power supply rejection ratio. It is a cost-effective and efficient solution for providing fixed output voltage from a varying input voltage supply, with transient response of 2µs and high power supply rejection ratio (PSRR).

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