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PMIC - Supervisors

TPS3851H18SQDRBRQ1 Application Field and Working Principle

The TPS3851H18SQDRBRQ1 is a supervisor integrated circuit (IC) that is part of the Supervisory Sense module of Texas Instrument’s Power Management IC (PMIC) family. The Supervisory Sense is used to detect overvoltage or undervoltage conditions in the IC’s power supply. The IC also has reset functionality to maintain issues that are caused by erroneous conditions. The TPS3851H18SQDRBRQ1 was designed for use in digital signal processers, microprocessors, power management systems, and low voltage and high voltage applications.

The TPS3851H18SQDRBRQ1 can be programmed to detect any voltage level within its specified range. The monitored voltage can be set through two external resistors. Once the voltage is set, the IC can maintain the system\'s power supply by providing a reset circuit that cuts the power when it senses a voltage outside of the specified range (overvoltage or undervoltage). The reset circuit can be further programmed to delay the turn-on of the system after its initial power-on or if it was shut down by the reset circuit. The deglitching feature of the IC inhibits false triggering of the reset circuit caused by voltage transients.

The TPS3851H18SQDRBRQ1 also has an integrated digital filter that comprises a first-order-lowpass filter that is tunable for the cutoff frequency and attenuation requirements by tuning two external resistors. It is recommended that this feature is used in conditions that have high-frequency noise present in the power supply. The integrated digital filter will reject high-frequency noise above the filter turning frequency and allow the monitored voltage to remain stable.

The TPS3851H18SQDRBRQ1 also offers a 60-μA (typical) open drain output which can be used to provide a reset signal. The reset signal can be used by other components on the system to detect the overvoltage or undervoltage condition. The reset signal can also be used to take the IC or the system offline if there is an exceeded temperature value. The open drain output of the supervisor has a push-pull option that is available if the device is powered through VDD. Typical applications of the TPS3851H18SQDRBRQ1 include computer servers, multi-core processors, automotive applications, and sensor nodes.

In conclusion, the TPS3851H18SQDRBRQ1 is an integrated circuit designed for use in digital signal processing and power management systems. The IC detects overvoltage and undervoltage conditions in the power supply and provides a reset circuit to ensure system stability. The integrated digital filter reduces high-frequency noise, and the open drain output provides a reset signal that can be used by other components in the system. The supervisor is appropriate for use in computer servers, power management systems, automotive applications and sensor nodes.

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