Overview
The TPS3808G12DBVT is a microprocessor supervisory circuit produced by Texas Instruments. This device is 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. It is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA. The TPS3808G12DBVT 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 | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Supply Range (VDD) | 1.7 | - | 6.5 | V |
| Supply Current (IDD) at VDD = 3.3 V | 2.4 | 5 | μA | |
| Low-Level Output Voltage (VOL) | 0.3 | - | 0.4 | V |
| Threshold Accuracy (VIT ≤ 3.3 V) | -1.5% | ±0.5% | 1.5% | % |
| Reset Delay Time | 1.25 ms | - | 10 s | - |
| Operating Temperature Range | -40 | - | 125 | °C |
| Package Type | SOT-23, WSON | - | - | - |
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 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
- Open-drain RESET output
- Small SOT-23 and 2-mm × 2-mm WSON packages
- Temperature range: –40°C to 125°C
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 TPS3808G12DBVT?
The typical quiescent current is 2.4 μA, making it suitable for battery-powered applications.
- What are the available package types for the TPS3808G12DBVT?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the operating temperature range of the TPS3808G12DBVT?
The operating temperature range is –40°C to 125°C.
- How can the reset delay time be adjusted on the TPS3808G12DBVT?
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 threshold accuracy of the TPS3808G12DBVT for VIT ≤ 3.3 V?
The threshold accuracy is ±0.5% typical for VIT ≤ 3.3 V.
- Can the TPS3808G12DBVT monitor any voltage rail down to 0.4 V?
- What is the purpose of the manual reset (MR) input on the TPS3808G12DBVT?
The manual reset (MR) input allows for manual assertion of the RESET signal by driving the MR pin low.
- What type of output does the TPS3808G12DBVT have for the RESET signal?
The RESET output is an open-drain output.
- How does the TPS3808G12DBVT handle short negative transients on the SENSE pin?
The device is relatively immune to short negative transients on the SENSE pin, with sensitivity dependent on threshold overdrive.
- What is the recommended practice for reducing sensitivity to transients and layout parasitics on the SENSE input?
It is good analog design practice to put a 1-nF to 10-nF bypass capacitor on the SENSE input.
