TPS799L57YZYT

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PMIC or Power Management ICs are integrated circuits that facilitate the conversion and management of power within an electronic system. The TPS799L57YZYT is a linear, low-dropout, low-noise 3.2A voltage regulator with a 3MHz (typical) bandwidth. It supports an input voltage range of 1.8V to 5.5V and an adjustable output voltage range of 0.8V to 2.75V. The device is designed for use in mainstream applications where space is limited, such as mobile and embedded designs.

Application Field

The TPS799L57YZYT is designed for use in portable and embedded applications which require a wide input voltage, low dropout voltage and a fast transient response. The device is ideal for use in modern handheld devices such as smart phones, tablets, and cameras. It can also be used in IoT, automotive, and general industrial applications requiring a low-noise linear voltage regulator.

Features and Benefits

• Wide input voltage range of 1.8V to 5.5V
• Low dropout voltage (3.4mV @ 200mA)
• Fast transient response (3MHz typical bandwidth)
• 3.2A output current capability
• Low output voltage noise of 10μV RMS
• Thermal shutdown protection

Working Principle

The TPS799L57YZYT is a linear, low-dropout, low-noise 3.2A voltage regulator and is based on the classic linear regulator architecture. The device consists of an input voltage, an error amplifier, a pass transistor, a reference and a feedback network. When power is applied to the input, the error amplifier compares the sensed voltage on the feedback network with the reference voltage and provides an output signal to the pass transistor which regulates the output voltage. If the output voltage rises, the error amplifier reduces the output which reduces the current through the pass transistor, thus reducing the voltage drop and resulting in a decrease in output voltage.

Input Voltage

The TPS799L57YZYT supports an input voltage range of 1.8V to 5.5V. The device operates over this range with an efficiency of up to 97% typical. To protect the device from input overloads, an internal MOSFET is used to limit VIN.

Error Amplifier

The error amplifier of the TPS799L57YZYT is a fast, stabilized Transconductance Amplifier (T-AMP) with an open-loop gain of 80dB. The T-AMP circuit is capable of driving up to 7A at the output. It has a bandwidth of up to 3MHz and is stable with a wide range of output capacitors.

Pass Transistor

The pass transistor of the TPS799L57YZYT is a PowerPolarity-enhanced (PPE) MOSFET which enables low dropout performance. The PPE MOSFET can support up to 3.2A of continuous current and is designed for load dump protection for automotive applications.

Reference and Feedback Network

The TPS799L57YZYT has an adjustable output voltage range of 0.8V to 2.75V via the feedback network. The device also has an internal 2.5V reference voltage. The feedback network consists of a resistor divider connected to the output and the input. The output voltage is ratioed up to the input voltage. By changing the ratios of the resistors, the output voltage can be adjusted.

Conclusion

The TPS799L57YZYT is a low noise, low dropout linear voltage regulator with a wide input voltage range, fast transient response and 3.2A output current capability. The device is ideal for use in portable and embedded applications such as smart phones, tablets, cameras, and industrial applications requiring a low-noise linear voltage regulator.

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