TPS3838K33DBVT

Series:	--
Packaging:	Tape & Reel (TR)
Part Status:	Active
Type:	Simple Reset/Power-On Reset
Number of Voltages Monitored:	1
Output:	Open Drain or Open Collector
Reset:	Active Low
Reset Timeout:	100 ms Minimum
Voltage - Threshold:	2.93V
Operating Temperature:	-40°C ~ 85°C (TA)
Mounting Type:	Surface Mount
Package / Case:	SC-74A, SOT-753
Supplier Device Package:	SOT-23-5
Base Part Number:	TPS3838K33

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Introduction

The TPS3838K33DBVT is a 3.3V Supervisory circuit with advanced reset-signal timing and push-button reset. It provides a wide 6V–24V operating input voltage range. Its precision is +/-2% voltage accuracy over supply voltage and temperature. The TPS3838K33DBVT can monitor up to four independent power rail from 2.5V to 5.5V. The on-chip logic combines during a power diagnostic analysis, a push-button reset input, wireless power detect, and power-okay status output.

Application Field

TPS3838K33DBVT typically used in the following system\'s power management applications:* Point-of-Load (PoL) and Auxiliary supplies* Computer power supplies* Automotive systems* Telecommunications systems* Automotive battery chargers* CCFL backlight inverters* Portable and handheld systems* Home and industrial systemTPS3838K33DBVT can provide a multi-level system reset and wireless power detect logic scheme. It provides three digital outputs (reset_b, reset_c, and cold_on), and one analog output (power_ok). The reset_b provides an active-low output that serves as the primary reset signal for the system, while the reset_c provides either an active-high or active-low reset output depending on the selected reset signals. The cold_on provides a cold-start reset to prevent data and system initialization violations. Finally, the power_ok signal is an analog power monitor output and is used, for example, to provide a low threshold voltage warning for an under-voltage lockout (UVLO) condition.

Working Principle

TPS3838K33DBVT has an on-chip logic circuit that combines a reset push-button input, wireless power detect and power-ok status output. When the device is in normal operation mode, the free-running oscillator sets the internal reset threshold voltage (VTRIP), monitors the voltage on the VDDIN pin, and if the detected voltage is below the VTRIP threshold voltage, an internal reset signal is generated and reset signals are output. The reset output is held active until the input voltage is above the VTRIP level.When the reset push-button input is pressed, the reset circuit is forced into a reset state, regardless of the power supply voltage, and reset signals are output. When a wireless power detect input is connected to the device, it provides an indication to the device that a power failure is about to occur. When this occurs, the device will detect a power failure and output a reset signal.Finally, the power_ok signal indicates the power supply voltage level. This signal is a low threshold voltage warning for an under-voltage lockout (UVLO) condition. The power_ok signal can be used to detect a low voltage condition, which is useful for providing a warning before the system shuts down.

Conclusion

The TPS3838K33DBVT is an advanced reset-signal timing and push-button reset circuit with a wide operating input voltage range. It is typically used in applications such as computer, automotive, and telecommunications systems where it can provide a multi-level system reset and wireless power detect logic scheme. On-chip logic circuits combine a reset push-button input, wireless power detect and power-ok status output enabling the device to detect and output reset signals in response to power supply voltage changes. The power_ok signal also provides a low threshold voltage warning for an under-voltage lockout (UVLO) condition.

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