Overview
The TPS3808G30DBVT, produced by Texas Instruments, is a low-quiescent-current, programmable-delay supervisory circuit designed to monitor system voltages and assert a reset signal when the voltage drops below a preset threshold or when the manual reset (MR) pin is driven low. This device is part of the TPS3808 family, which offers a range of voltage threshold and reset delay time adjustments, making it versatile for various applications.
The TPS3808G30DBVT is particularly suited for battery-powered and low-power systems due to its very low typical quiescent current of 2.4 μA. It is available in SOT-23 and 2-mm × 2-mm WSON packages and operates over a temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Nominal Supply Voltage | 3 V | V |
| Threshold Voltage (VIT) | 2.79 V | V |
| Quiescent Current | 2.4 μA (typical) | μA |
| Threshold Accuracy | ±0.5% (typical) for VIT ≤ 3.3 V | % |
| Reset Delay Time | 1.25 ms to 10 s (user-adjustable) | s |
| Manual Reset (MR) Input | Logic low to assert reset | |
| RESET Output | Open-drain | |
| Temperature Range | –40°C to 125°C | °C |
| Package Options | SOT-23, 2-mm × 2-mm WSON |
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: ±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
- User-adjustable reset delay time using an external capacitor
- Immunity to short negative transients on the SENSE pin
Applications
- DSP or microcontroller applications
- Notebook and desktop computers
- PDAs and hand-held products
- Portable and battery-powered products
- FPGA and ASIC applications
Q & A
- What is the typical quiescent current of the TPS3808G30DBVT?
The typical quiescent current is 2.4 μA.
- What is the range of the adjustable reset delay time?
The reset delay time can be adjusted from 1.25 ms to 10 s.
- How can the reset delay time be set?
The reset delay time can be set by connecting the CT pin to VDD, leaving it open, or using an external capacitor.
- What is the threshold voltage for the TPS3808G30DBVT?
The threshold voltage (VIT) is 2.79 V.
- What are the package options for the TPS3808G30DBVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G30DBVT?
The device operates over a temperature range of –40°C to 125°C.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the reset when driven low.
- What type of output does the RESET pin have?
The RESET output is open-drain.
- Why is the TPS3808G30DBVT suitable for battery-powered applications?
It is suitable due to its very low quiescent current of 2.4 μA typical.
- How can the threshold voltage be adjusted for the TPS3808G01 version?
The threshold voltage can be adjusted using an external resistor divider for the TPS3808G01 version.
