Overview
The TPS3808G30DBVRG4, produced by Texas Instruments, is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. This device is part of the TPS3808 family, designed to monitor system voltages from 0.4 V to 5 V and assert 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 both the manual reset and SENSE voltages return above their respective thresholds. This component is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VDD (Input supply range) | –40°C < TJ < 125°C | 1.7 | 6.5 | V | |
| IDD (Supply current) | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open | 2.4 | 2.4 | 5 | μA |
| VOL (Low-level output voltage) | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA | 0.3 | V | ||
| VIT (Threshold voltage) | For TPS3808G30 | 2.79 | V | ||
| VHYS (Hysteresis on VIT pin) | Fixed versions | 1% | 2.5% | ||
| R_MR (MR Internal pullup resistance) | 70 | 90 | 90 | kΩ | |
| Temperature range | –40°C | 125°C | °C | ||
| Package | SOT-23, WSON (2-mm × 2-mm) |
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
- User-adjustable reset delay time using an external capacitor
- 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 primary function of the TPS3808G30DBVRG4?
The primary function is 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.
- What is the range of the input supply voltage for the TPS3808G30DBVRG4?
The input supply voltage range is from 1.7 V to 6.5 V.
- How low can the quiescent current of the TPS3808G30DBVRG4 be?
The typical quiescent current is 2.4 μA.
- What is the threshold accuracy for the TPS3808G30DBVRG4?
The threshold accuracy is 0.5% typical for VIT ≤ 3.3 V.
- How can the reset delay time be adjusted?
The reset delay time can be adjusted by connecting the CT pin to VDD, leaving it open, or using an external capacitor to set a delay between 1.25 ms and 10 s.
- What are the available package options for the TPS3808G30DBVRG4?
The device is available in SOT-23 and 2-mm × 2-mm WSON packages.
- What is the temperature range for the TPS3808G30DBVRG4?
The device is fully specified over a temperature range of –40°C to 125°C.
- Can the TPS3808G30DBVRG4 be used in battery-powered applications?
Yes, it is well-suited for battery-powered applications due to its low quiescent current.
- How does the manual reset (MR) input work?
The manual reset (MR) input asserts the RESET signal when driven low.
- What is the purpose of the SENSE input?
The SENSE input monitors any system voltage and asserts the RESET signal if the voltage drops below the preset threshold.
