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TPS76628DR Application Field and Working Principle

The TPS76628DR is a linear voltage regulator that belongs to the PMIC (power management integrated circuits) family of voltage regulators. It is designed for use in a wide range of consumer and industrial applications such as wireless communication, handheld devices, home appliances and automotive electronics. The TPS76628DR is a high-efficiency, cost-effective and space-saving solution for voltage regulators.

Features

• Wide input voltage range: 2.7V to 5.5V
• Operating temperature range from -40°C to +125°C
• Low quiescent current: 2.5mA (max)
• High PSRR (Power Supply Rejection Ratio): 80dB at 1kHz
• High ripple rejection: 85dB
• Programmable output voltage: 0.8V to 5V with 0.02% accuracy
• Current limit protection
• Current sharing between outputs
• Very low drop-out operation (5mV typ)
• Thermal shut-down protection
• Integrated power MOSFET
• Available in a 3mm × 3mm DFN package

Working Principle

Basically, the TPS76628DR is a linear voltage regulator that reduces the input voltage to a regulated output voltage. It consists of an adjustable voltage reference, an error amplifier, a current limit detection circuit and a MOSFET pass element. The IC also contains a thermal shutdown circuit.

The TPS76628DR uses an adjustable voltage reference (VREF) to monitor the output voltage. The voltage reference sets a reference voltage that is compared to the output voltage. The error amplifier (EA) amplifies the difference between the reference voltage and the output voltage. If the output voltage is lower than the reference voltage, the error amplifier will output a voltage that increases the current flowing through the MOSFET pass element. This increases the output voltage until it reaches the right value and the error amplifier outputs a null signal again.

The current limit detection circuit, which monitors the voltage across the pass element, sets a current limit value that the user can adjust. The pass element\'s current cannot exceed this value, thus providing additional protection for the device and its supply lines.

The thermal shutdown circuit prevents the TPS76628DR from overheating by disabling it if the junction temperature exceeds 155°C. This protection feature is enabled/disabled by a signal on the TSD/SD pin.

Applications

• Notebook PCs
• Portable media players
• Cameras
• GPS receiver
• Home appliances
• Mobile phones
• Industrial systems
• Wireless communication
• Printers and copiers
• Automotive electronics

Conclusion

The TPS76628DR is a highly efficient, cost-effective and space-saving linear voltage regulator. It offers a wide input voltage range, low quiescent current, high PSRR, current limit protection and thermal shut down protection for better performance. It is a suitable choice for consumer and industrial applications such as notebook PCs, portable media players, cameras, GPS receiver, mobile phones, industrial systems and automotive electronics.

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