Overview
The TPS3808G12DRVTG4 is a low-quiescent-current, programmable-delay supervisory circuit produced by Texas Instruments. This device is part of the TPS3808 family, 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. The TPS3808G12DRVTG4 is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VDD Input Supply Range | 1.7 | - | 6.5 | V |
| IDD Supply Current (VDD = 3.3 V, RESET not asserted) | 2.4 | - | 5 | μA |
| VOL Low-Level Output Voltage (1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA) | 0.4 | - | - | V |
| VPOR Power-Up Reset Voltage | 0.8 | - | - | V |
| VIT Negative-Going Input Threshold Accuracy (VIT ≤ 3.3 V) | -1.5% | ±0.5% | 1.5% | % |
| Temperature Range | -40°C | - | 125°C | °C |
| Reset Delay Time | 1.25 ms | - | 10 s | - |
| Package Type | 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: 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
- Temperature range: –40°C to 125°C
- Small SOT-23 and 2-mm × 2-mm WSON packages
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 TPS3808G12DRVTG4? The typical quiescent current is 2.4 μA.
- What is the temperature range of the TPS3808G12DRVTG4? The temperature range is from –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, or adjusted between 1.25 ms and 10 s by connecting the CT pin to an external capacitor.
- What are the available package types for the TPS3808G12DRVTG4? The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the threshold voltage for the TPS3808G12DRVTG4? The threshold voltage for the TPS3808G12 is 1.12 V.
- How does the SENSE input work? The SENSE input monitors any system voltage, and if the voltage drops below the preset threshold (VIT), it asserts the RESET signal.
- What is the purpose of the manual reset (MR) input? The manual reset (MR) input allows for manual assertion of the RESET signal by driving the MR pin low.
- What is the significance of the high threshold accuracy? The high threshold accuracy of 0.5% ensures reliable and precise voltage monitoring.
- Can the threshold voltage be customized? Yes, custom threshold voltages from 0.82 V to 3.3 V or from 4.4 V to 5 V are available through factory EEPROM programming.
- Why is the TPS3808G12DRVTG4 suitable for battery-powered applications? It is suitable due to its very low quiescent current, which helps in conserving battery life.
