TPS76650DR

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Introduction to TPS76650DR

The TPS76650DR is a high-efficiency, low-dropout (LDO) linear voltage regulator that provides a low output impedance and a wide output range capability. It offers a wide input voltage range from 1.2V to 5V and an adjustable output voltage from 0V to 3.3V. The innovative design of the TPS76650DR utilizes an external MOSFET to achieve ultra-high efficiency and fast transient response. The integrated low ESR output capacitor also helps to improve stability and reliability. The TPS76650DR is available in two packages: the 5- lead SOT23-2 and 3-lead SOT143-1.

Application Fields

The TPS76650DR can be used in various applications where low output voltage, low dropout and high efficiency are required. It is ideal for applications such as wireless headsets, portable PCs and personal digital assistants (PDAs). The device is also suitable for use in post-regulation of DC/DC converters, providing accurate supply voltage for core logic in such systems as PDAs, laptop computers, and handheld equipment.

Furthermore, the high efficiency, low dropout and wide voltage range make the TPS76650DR suitable for many battery-powered applications. It can effectively extend the life of the battery. The TPS76650DR can also be used in demanding applications, such as those requiring long input voltage range and wide operating temperature range, where reliable linear regulation solution is necessary.

Working Principle

The TPS76650DR is a linear regulator integrated with a MOSFET, load capacitor and a current limiting circuit. It is designed to utilize a very small current drawn from the input supply. The device operates in two modes: an active mode when the output voltage needs to be adjusted and a standby (sleep) mode when the output voltage does not need to be adjusted. The device operates in linear mode when in active mode.

In active mode, a voltage reference and an error amplifier generate a reference voltage that is compared against a feedback voltage from the output. The output voltage is kept constant during active mode by adjusting the duty cycle of the MOSFET switch according to the difference between the reference voltage and the feedback voltage. The current limit circuit is used to protect the device from short circuit conditions. In standby mode, the MOSFET is turned off, and the output voltage is held constant by the combination of the output capacitor, ESR and inductor.

The TPS76650DR is thermally protected by an overtemperature monitoring circuit. The internal thermal sense circuit shuts down the regulator if the internal temperature reaches too high a temperature. In addition, the thermal protection scheme will shut down the regulator if the MOSFET dissipates too much energy, preventing a thermal runaway.

In summary, the TPS76650DR is a low dropout linear voltage regulator with ultra-high efficiency and fast transient response. Its wide input voltage range and adjustable output voltage make it an ideal choice for many applications. The integrated MOSFET, load capacitor, current limiting and thermal protection circuits work together to provide reliable, stable voltage regulation.

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