TPS76301DBVTG4

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TPS76301DBVTG4 Application Field and Working Principle

The TPS76301DBVTG4 is a low-dropout (LDO) voltage regulator designed for low-level, high-performance and low-power applications. It is part of the family of low dropout voltage regulators (LDO) offered by Texas Instruments and provides an ultra-low quiescent current with excellent output current andvoltage accuracy over a wide range of supply voltages. The device is capable of supplying 500mA of continuous current, making it ideal for low-level use in applications such as cellular handsets and battery-powered situations.

The LDOs offer accurate output voltage levels (1%, 2.5%, or adjustable) and very low quiescent current operation. This makes them ideal for low-voltage applications such as camera modules, personal media players, and other handheld devices. The device turns on in less than 1microsecond, allowing for fast start up time and reduced power Consumption.

Applications

• Cellular handsets
• Camera modules
• Personal media players
• Handheld devices

Working Principle

The working principle of the TPS76301DBVTG4 is based on a voltage regulator circuit that switches the output voltage at a predetermined frequency. The circuit contains two N-Channel MOSFETs, interconnected by two capacitor-input resistors. One MOSFET is connected in series with a resistor and the other is connected to the output voltage. Both the MOSFETs are driven by a control signal that is generated by an on-chip oscillator.

The control signal is applied to the bases of both MOSFETs. During the high logic cycle, one MOSFET is kept on while the other is turned off. During the low logic cycle, the opposite occurs. This causes the output voltage to switch between the voltage applied to the bases of both MOSFETs, thus creating a voltage regulating circuit.

The frequency of the control signal is determined by an on-chip oscillator, whereas the output voltage is determined by the voltage applied to the bases. This can be adjusted by using an external resistive divider network, allowing for adjustable output voltages. The TPS76301DBVTG4 also provides a PGOOD output that can be used to indicate the validity of the output voltage.

Benefits and Drawbacks

The main benefit of the TPS76301DBVTG4 is its high efficiency, low power consumption, and extremely low dropout voltage. As it is an integrated circuit, it also offers improved thermal performance and uses less board space than discrete-circuit counterparts. Additionally, the PGOOD output pin provides an easy way to ensure the validity of the output voltage.

However, the device is limited in terms of its current capability, which is 500mA. Additionally, the output voltage is fixed, meaning that an adjustable voltage regulator must be used for applications requiring multiple output voltages. Finally, the device requires an external switching clock, which requires additional components and complexity to be added.

Conclusion

The TPS76301DBVTG4 is ideal for low-level and high-performance applications due to its low quiescent current and regulated output voltage. It offers an efficient, low-power solution in a compact IC package. However, it is limited in its current capability, with a maximum of 500mA, and its output voltage is fixed. Additionally, an external clock must be used for operation.

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