Overview
The TPS3808G18QDBVRQ1 is a low-quiescent current programmable-delay supervisory circuit produced by Texas Instruments. This device is specifically designed for automotive applications and is part of the TPS3808-Q1 family. It monitors system voltages from 0.4 V to 5 V and asserts an open-drain RESET signal when the SENSE voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. The device features a very low typical quiescent current of 2.4 µA, making it suitable for battery-powered applications. It is available in a small SOT-23 package and is fully specified over a temperature range of –40°C to +125°C.
Key Specifications
| Parameter | Min | Typical | Max | Unit |
|---|---|---|---|---|
| VDD Input Supply Range | 1.8 | - | 6.5 | V |
| Supply Current (IDD) | 2.4 | 5 | 6 | µA |
| Low-Level Output Voltage (VOL) | 0.3 | 0.4 | - | V |
| Threshold Accuracy (VIT ≤ 3.3 V) | -1.25% | ±0.5% | +1.25% | % |
| Reset Delay Time | 1.25 ms | - | 10 s | - |
| Operating Temperature Range | -40°C | - | 125°C | °C |
| Package Type | - | SOT-23 (DBV) | - | - |
| Pins | - | 6 | - | - |
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
- 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
- Small SOT-23 Package and WSON Package (for some variants)
Applications
The TPS3808G18QDBVRQ1 is suitable for a variety of applications, particularly in the automotive sector due to its automotive qualification. It is ideal for monitoring system voltages in battery-powered devices, ensuring reliable operation and preventing system malfunctions. Other applications include:
- Battery-Powered Systems: Due to its low quiescent current, it is well-suited for battery-powered applications
- Automotive Electronics: Qualified for automotive applications, it can be used in various automotive systems
- Embedded Systems: Useful in embedded systems that require precise voltage monitoring and reset capabilities
Q & A
- What is the typical quiescent current of the TPS3808G18QDBVRQ1?
The typical quiescent current is 2.4 µA
- What is the adjustable delay time range for the reset signal?
The adjustable delay time ranges from 1.25 ms to 10 s
- What is the operating temperature range of the TPS3808G18QDBVRQ1?
The operating temperature range is –40°C to +125°C
- What types of packages are available for the TPS3808-Q1 family?
The device is available in SOT-23 (DBV) and WSON packages (for some variants)
- How does the manual reset (MR) input work?
The manual reset (MR) input allows a processor or other logic circuits to initiate a reset by driving the MR pin low. After MR returns to a logic high and SENSE is above its reset threshold, RESET is deasserted after the user-defined reset delay expires
- What is the threshold accuracy of the TPS3808G18QDBVRQ1?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V
- Can the threshold voltage be adjusted?
- How is the reset delay time adjusted?
The reset delay time can be adjusted by connecting the CT pin to VDD, leaving it open, or connecting it to an external capacitor
- What is the purpose of the SENSE input?
The SENSE input provides a terminal to monitor any system voltage. If the voltage on this pin drops below VIT, the RESET signal is asserted
- Is the TPS3808G18QDBVRQ1 suitable for battery-powered applications?
