TPS3813K33QDBVRQ1

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PMIC - Supervisors

The TPS3813K33QDBVRQ1 is a fully-integrated power management IC (PMIC) supervisor with ultra-small packages. It is a member of a family of ultra-small, low-power supervisors, which has become increasingly popular in small form factor applications such as portable media players, tablet applications, industrial applications and wearable devices.

The TPS3813K33QDBVRQ1 has an operating voltage range between 1.3V and 1.8V. It has two power rail supervisors, which are designed for monitoring two-level power-on for safe system startup and graceful shutdown. It also has an integrated power-on reset (POR) delay timer, which sets the minimum time required for system startup and shutdown transitions. It also features a power-down timer and a watchdog timer with adjustable timeout period.

The TPS3813K33QDBVRQ1 is a very low power PMIC supervisor. Its active current consumption is only 0.18µA (typ). Its maximum standby current consumption is 2.0µA (max). The device supports external reset and WDI signals with active LOW or active HIGH options. It provides an active-LOW or an active-HIGH RESET or WDI output signal when an open-drain or push-pull pin is enabled, respectively.

The TPS3813K33QDBVRQ1 PMIC is widely used in a variety of applications, such as portable NFC readers, network access points, medical equipment, automotive system controllers, and industrial/consumer equipment. In particularly, it is used in power-sensitive applications that require a push-pull RESET/WDI output with minimal leakage current.

Working Principle

The TPS3813K33QDBVRQ1 PMIC operates by monitoring two separate power supply rails. The power rails are VCC and VPOR, which must be regulated between 1.3V and 1.8V. The TPS3813K33QDBVRQ1 has an integrated power-on reset (POR) delay timer, which sets the minimum time required for system startup and shutdown transitions. It uses a digital loop for system monitoring logic.

In the normal operation mode, both power rails are monitored by the device and its output remains inactive. When any of the monitored power rail (VPOR or VCC) drops below its lower-limit threshold, the supervisor enters a power-on reset (POR) mode and will delay the restart until it reaches the middle of its limits. This system prevents the device from resetting itself due to external voltage transients.

The output of the TPS3813K33QDBVRQ1 is an active-LOW RESET/WDI open-drain pin, which can be configured as either a push-pull or open-drain. In case of a RESET/WDI event, the output pin is driven to the appropriate voltage level and remains in that state until reset is de-asserted. Once the power-on reset condition is cleared, the supervisor will continue to remain active until the next power-on reset condition is met.

Conclusion

The TPS3813K33QDBVRQ1 PMIC is an ultra-small, low-power supervisor suitable for applications with power sensitivities. It is widely used in portable NFC readers, network access points, medical equipment, automotive system controllers, and industrial/consumer equipment. It has all the key features for a robust power management with low power consumption, including power rail supervisors, a power-on reset delay timer, a power-down timer, and a WDI with adjustable timeout period.

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