Overview
The TPS3808G09DBVR is a low-quiescent current, programmable-delay supervisory circuit manufactured by Texas Instruments. This device is part of the TPS3808 family, designed to monitor system voltages and provide a reset signal when the voltage drops below a preset threshold or when the manual reset pin is triggered. It is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 µA.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage Range | 0.9 V to 5 V | |
| Threshold Voltage Accuracy | 0.5% typical for VIT ≤ 3.3 V | |
| Quiescent Current | 2.4 µA typical | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open |
| Reset Delay Time | 1.25 ms to 10 s (user-adjustable) | |
| Temperature Range | –40°C to 125°C | |
| Package Types | SOT-23 (6 pins), 2-mm × 2-mm WSON (6 pins) | |
| Low-level Output Voltage | 0.3 V (for VDD = 1.3 V to 1.8 V, IOL = 0.4 mA), 0.4 V (for VDD = 1.8 V to 6.5 V, IOL = 1 mA) |
Key Features
- Power-on reset generator with adjustable delay time from 1.25 ms to 10 s.
- Very low quiescent current of 2.4 µA typical, making it suitable for battery-powered applications.
- High threshold accuracy of 0.5% typical for VIT ≤ 3.3 V.
- Fixed threshold voltages for standard voltage rails from 0.9 V to 5 V and adjustable voltage down to 0.4 V.
- Manual reset (MR) input and open-drain RESET output.
- Small SOT-23 and 2-mm × 2-mm WSON packages.
- Fully specified over a temperature range of –40°C to 125°C.
Applications
The TPS3808G09DBVR is versatile and can be used in a wide range of applications, including:
- Battery-powered devices due to its low quiescent current.
- Microprocessor and microcontroller systems requiring voltage monitoring and reset capabilities.
- Industrial control systems where precise voltage monitoring is crucial.
- Automotive and aerospace applications due to its wide temperature range.
Q & A
- What is the typical quiescent current of the TPS3808G09DBVR?
The typical quiescent current is 2.4 µA.
- What is the range of the reset delay time for the TPS3808G09DBVR?
The reset delay time can be set between 1.25 ms and 10 s and can also be fixed at 20 ms or 300 ms under specific conditions.
- What are the available package types for the TPS3808G09DBVR?
The device is available in SOT-23 (6 pins) and 2-mm × 2-mm WSON (6 pins) packages.
- What is the temperature range for the TPS3808G09DBVR?
The device is fully specified over a temperature range of –40°C to 125°C.
- How accurate is the threshold voltage for the TPS3808G09DBVR?
The threshold voltage accuracy is 0.5% typical for VIT ≤ 3.3 V.
- Can the threshold voltage be adjusted for the TPS3808G09DBVR?
- What types of reset inputs does the TPS3808G09DBVR support?
The device supports both automatic reset based on the SENSE voltage and manual reset via the MR pin.
- What is the purpose of the CT pin on the TPS3808G09DBVR?
The CT pin is used to set the reset delay time, which can be adjusted by connecting it to VDD with a resistor or to an external capacitor.
- How does the TPS3808G09DBVR handle transients on the SENSE input?
The device is relatively immune to short negative transients on the SENSE pin, and sensitivity to transients can be reduced by using a bypass capacitor.
- What is the output type of the RESET signal on the TPS3808G09DBVR?
The RESET output is an open-drain signal.
