Overview
The TPS3808G30DRVT from Texas Instruments is a low-quiescent current supervisor with programmable delay and manual reset capabilities. This device is part of the TPS3808 family of microprocessor supervisory circuits, designed to monitor system voltages ranging from 0.4 V to 5 V. It 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 RESET output remains low for a user-adjustable delay time after the SENSE voltage and manual reset return above their respective thresholds.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 0.4 V to 5 V | V |
| Threshold Accuracy | 0.5% typical | % |
| Quiescent Current | 2.4 μA typical | μA |
| Reset Delay Time | 1.25 ms to 10 s (programmable) | s |
| Manual Reset (MR) Input | Logic low | |
| RESET Output | Open-drain | |
| Temperature Range | –40°C to 125°C | °C |
| Package Type | WSON (DRV), 6 pins |
Key Features
- 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 0.9 V to 5 V and adjustable voltage down to 0.4 V
- Manual reset (MR) input
- Open-drain RESET output
- Temperature range: –40°C to 125°C
- Small SOT-23 and 2-mm × 2-mm WSON packages
Applications
The TPS3808G30DRVT is particularly suited for applications in DSP or microcontroller systems, especially those requiring precise power-up and power-down sequencing. Its low quiescent current makes it ideal for battery-powered devices.
Q & A
- What is the operating voltage range of the TPS3808G30DRVT? The operating voltage range is from 0.4 V to 5 V.
- What is the typical quiescent current of the TPS3808G30DRVT? The typical quiescent current is 2.4 μA.
- 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 user-adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor.
- What is the temperature range of the TPS3808G30DRVT? The temperature range is –40°C to 125°C.
- What types of packages are available for the TPS3808G30DRVT? The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the purpose of the manual reset (MR) input? The manual reset (MR) input allows for a manual reset by driving the MR pin to a logic low.
- What is the type of RESET output? The RESET output is open-drain.
- How accurate is the threshold voltage monitoring? The threshold accuracy is 0.5% typical.
- Can the TPS3808G30DRVT monitor any voltage rail? Yes, it can monitor any voltage rail down to 0.4 V.
- Is the TPS3808G30DRVT suitable for battery-powered applications? Yes, due to its very low quiescent current, it is well-suited for battery-powered applications.
