TPS60402DBVTG4

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The TPS60402DBVTG4 belongs to the PMIC (Power Management IC) family, specifically to the Voltage Regulators category and the DC DC Switching Regulators type. It is a highly integrated solution that is easily embedded with switched-mode power applications in many different industries. This article will provide a comprehensive overview of its application field and working principle.

Overview

The TPS60402DBVTG4 is a 19-V Input, 2-A, buck regulator with selectable output voltages. This product is integrated with a power MOSFET, soft-start circuit, selectable output voltage range, Over-Voltage Protection, Output Discharge switch and various protection features. It is designed to maintain a very high efficiency at low output currents up to 5.0V output voltages. This buck regulator is designed to cope with input voltage variations while offering peak efficiency up to 93%.

This PD60402DBVTG4 is ideal for a broad range of application fields, including but not limited to consumer, computing, automotive and industrial applications. In these application fields, it is mainly used for powering up embedded systems, portable communication devices and interface converters such as USB and PCIe.

Working Principle

The TPS60402DBVTG4 works by utilizing the buck converter, which works on the principle of Pulse Width Modulation (PWM). It operates by changing the duty cycle of a pulse train, which results in a lower output voltage across the load (output of the buck regulator, in general). The TPS60402DBVTG4 also has a dedicated comparison section, which measures the output voltage, using a voltage divider circuit. This comparison section plays a key role in optimization, since it is responsible for switching the charging and discharging cycle.

The comparison section consists of an analog comparator and two voltage dividers connected to the output and feedback pins. When the output voltage is greater than the feedback voltage, the comparator output goes high and engages the soft-start circuit. This in turn enables the power MOSFET to discharge the output capacitors, and reduce the output voltage. When the output voltage goes below the reference voltage, the comparator disengages, and the MOSFET is disabled and the Charge-pump mode is entered. The Charge-pump mode enables recharging of the output capacitors and maintains the required output voltage for the load.

Protection Features and Load Transient Response

The TPS60402DBVTG4 has several protection features, such as Over-Voltage, Under-Voltage, Over-Current and Short-Circuit protection. The Over-Voltage protection prevents output voltage from exceeding its nominal level. The Under-Voltage protection keeps the output voltage above its minimum allowable value. The Over-Current protection disables the buck converter in case of over-current. And the Short-Circuit protection prevents excessive current and temperature rise. In addition, the TPS60402DBVTG4 also has an Output Discharge switch, which can be used to safely discharge the output capacitor in order to prevent any residual charges.

The TPS60402DBVTG4 also provides good load transient response. It is designed to overcome the issue of output voltage overshoot that often occurs with conventional switching regulators. This is achieved by using an optimized control loop, a large output capacitance, and an output voltage trend indicator. The trend indicator provides warning signals to the user in case of any erratic output voltage behaviour.

Conclusion

The TPS60402DBVTG4 is a highly integrated solution that is designed to provide excellent performance while maintaining high efficiency at low output currents up to 5.0V. It is ideal for a variety of applications including consumer, computing, automotive, and industrial applications. The TPS60402DBVTG4 offers various protection features and good load transient response. It has an optimized control loop, a large output capacitance, and an output voltage trend indicator, which helps prevent output voltage overshoot. Taking all these features into account, it is safe to conclude that the TPS60402DBVTG4 is the ideal solution for applications that require a high-end DC-DC buck converter.

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