TPS70858PWP

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TPS70858PWP: Application Field and Working Principles

The Texas Instruments TPS70858PWP Linear voltage regulator is a low dropout (LDO) power supply device which is very popular in power system design. The TPS70858PWP device is designed to provide a fixed output voltage ranging from 1.2 to 3.3V. It is highly efficient, providing up to 1A of output current over the operating temperature range. The TPS70858PWP has a wide input voltage range of 2.5 to 5.5V, making it ideal for applications where voltage sources are higher than the output voltage. The device also features output voltage accuracy of ± 2%, low quiescent current of only 30µA and excellent transient response while consuming only 4mV of ground current.

The TPS70858PWP is a popular choice for medium-power applications, such as power supply for digital camera, portable devices, PDAs, and cell phones. It can also be used in wide variety of other applications like PoE Ethernet systems, LED drivers, and lithium-battery powered systems. It is also suitable for automotive and other rugged applications due to its 5V tolerant inputs.

Working Principles

The basic principle of operation of the TPS70858PWP is to use an on-chip P-channel MOSFET (PMOS) to step down the input voltage to the required output voltage. As the gate voltage of the PMOS is controlled by an error amplifier, the output voltage remains constant even as the input voltage changes. The output voltage is set by a single external resistor.

The TPS70858PWP also has a fault protection feature which turns off the output voltage if the over-current protection voltage is exceeded. The device also includes current limiting and thermal protection. The current limit can be disabled by connecting an external resistor between the current limit pin and the power ground.

Conclusion

The TPS70858PWP is an ideal choice for a wide variety of applications requiring a fixed output voltage ranging from 1.2 to 3.3V. It provides excellent performance with its low dropout voltage of 2.5V, low quiescent current, fast transient response and 5V tolerant inputs. It also features output voltage accuracy of ± 2%.

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