Overview
The TPS3808G125QDBVRQ1 is a low-quiescent current programmable-delay supervisory circuit produced by Texas Instruments. This device is designed to monitor system voltages ranging from 0.4 V to 5 V and assert an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is asserted to a logic low. The RESET output remains low for a user-adjustable delay time after the SENSE voltage and MR return above their thresholds. The TPS3808G125QDBVRQ1 is particularly suited for automotive and battery-powered applications due to its very low typical quiescent current of 2.4 µA and its operation over a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOT-23 (DBV), 6 pins |
| Operating Temperature Range | –40°C to +125°C |
| Threshold Voltage (VIT) | 1.25 V (typical: 1.16 V) |
| Quiescent Current | 2.4 µA (typical) |
| Threshold Accuracy | 0.5% (typical for VIT ≤ 3.3 V) |
| Reset Delay Time | 1.25 ms to 10 s (user-adjustable) |
| Manual Reset (MR) Input | Logic low (0.3 VDD) to assert reset |
| RESET Output | Open-drain |
| Package Size (SOT-23) | 2.90 mm × 1.60 mm |
Key Features
- Qualified for Automotive Applications
- Power-On Reset Generator With Adjustable Delay Time: 1.25 ms to 10 s
- Very Low Quiescent Current: 2.4 µA Typical
- High Threshold Accuracy: 0.5% Typical for VIT ≤ 3.3 V
- Fixed Threshold Voltages for Standard Voltage Rails From 1.2 V to 5 V and Adjustable Voltage Down to 0.4 V Are Available
- Manual Reset (MR) Input
- Open-Drain RESET Output
- Temperature Range: –40°C to +125°C
- Small SOT-23 Package and WSON Package (for some variants)
Applications
- DSP or Microcontroller Applications
- FPGA and ASIC Applications
- Automotive Vision
- Automotive Radar
- Battery-Powered Applications
Q & A
- What is the primary function of the TPS3808G125QDBVRQ1?
The primary function is to monitor system voltages and assert a reset signal when the voltage drops below a preset threshold or when the manual reset pin is asserted.
- What is the operating temperature range of the TPS3808G125QDBVRQ1?
The device operates over a temperature range of –40°C to +125°C.
- How can the reset delay time be adjusted?
The reset delay time can be set to 20 ms by disconnecting the CT pin, 300 ms by connecting the CT pin to VDD using a resistor, or can be user-adjusted from 1.25 ms to 10 s by connecting the CT pin to an external capacitor.
- What is the typical quiescent current of the TPS3808G125QDBVRQ1?
The typical quiescent current is 2.4 µA.
- What is the threshold accuracy of the TPS3808G125QDBVRQ1?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V.
- What types of packages are available for the TPS3808G125QDBVRQ1?
The device is available in a small SOT-23 package, and some variants are available in a WSON package.
- How does the manual reset (MR) input work?
A logic low (0.3 VDD) on the MR input causes the RESET signal to assert low. After MR returns to a logic high and SENSE is above its reset threshold, RESET is deasserted high after the user-defined reset delay expires.
- What are some common applications for the TPS3808G125QDBVRQ1?
Common applications include DSP or microcontroller applications, FPGA and ASIC applications, automotive vision, and automotive radar.
- Is the TPS3808G125QDBVRQ1 suitable for battery-powered applications?
Yes, it is well suited for battery-powered applications due to its very low quiescent current.
- How can multiple system voltages be monitored using the MR input?
The MR input can be used to monitor multiple system voltages by connecting it to logic circuits that can initiate a reset when any of the monitored voltages drop below their thresholds.
