TPS75333QPWP

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The TPS75333QPWP is a 3.1mm x 3.1mm x 0.6mm packaged, high-efficiency linear voltage regulator which is designed to regulate an input voltage range of 3V to 20V into a fixed output of 1.8V or adjustable output voltage range of 0.8V to 16V. It features an ultra-low dropout voltage of 180mV, heat sinking pad and low quiescent current of only 10µA, making it ideal for battery-powered applications.

The TPS75333QPWP also provides high efficiency due to its P-channel enhancement mode MOSFET topology. This, coupled with its low operating temperature range of -40°C to +85°C, makes it suitable for a wide range of portable applications including but not limited to medical and USB-connected devices. An added benefit of the TPS75333QPWP is its available optional Power-OK Open-Drain indicator output. This output indicates a valid output voltage and can be used to signal energy to the device and allow the system to go into a low-power mode.

The TPS75333QPWP operates in a linear regulator operating mode, meaning that it won’t be able to regulate output voltage under all conditions. To keep optimal performance and improve efficiency, the device uses an internal power control loop to regulate the proper output voltage. This feedback control loop implements an error amplifier and a P-channel MOSFET.

When the input voltage is greater than the selected output voltage, the P-channel MOSFET will be turned on to dissipate the excess energy as heat, allowing the output voltage to stay regulated. As the input voltage rises or the output voltage is loaded, the error amplifier senses the difference and turns on the P-channel MOSFET for a longer time. As the condition becomes worse and the error amplifier can\'t turn on the P-channel MOSFET enough to dissipate the excess energy, the output voltage will begin to rise, causing the device to no longer be able to maintain regulation.

There is a procedure to ensure sufficient headroom for the output to be regulated called voltage droop margin. This margin is equivalent to the difference between the input voltage and the required set point. As the input voltage of the TPS75333QPWP rises, the power dissipation of the device increases. This requires the voltage droop margin to be larger to ensure proper regulated output. This means that headroom is sacrificed in favour of a consistent output voltage.

The TPS75333QPWP also features a thermal protector, which will turn off the device if the maximum junction temperature is exceeded. This safety feature should ensure that the device operates within the specified conditions and will shut down the device in the event of an over temperature condition.

Overall, the TPS75333QPWP is a high efficiency and low quiescent current linear voltage regulator suitable for battery-powered and USB-connected devices applications. With its low dropout voltage, high input voltage range and ultra-low power consumption, the TPS75333QPWP is an ideal choice for portable designs that require reliable and consistent performance.

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