Overview
The TPS3808G15DBVRG4, produced by Texas Instruments, is a low-quiescent-current, programmable-delay microprocessor supervisory circuit. This device is 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 the SENSE voltage and manual reset (MR) return above their respective thresholds. The TPS3808G15DBVRG4 is particularly suited for battery-powered applications due to its very low typical quiescent current of 2.4 μA and high threshold accuracy of 0.5% typical for VIT ≤ 3.3 V.
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 | ||
| VOL (Low-level output voltage) | 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA | 0.4 | V | ||
| VIT (Negative-going input threshold accuracy) | VIT ≤ 3.3 V | –1.5% | ±0.5% | 1.5% | % |
| VHYS (Hysteresis on VIT pin) | Fixed versions | 1% | 2.5% | % | |
| R_MR (MR Internal pullup resistance) | 70 | 90 | kΩ | ||
| ISENSE (Input current at SENSE pin) | VSENSE = VIT | –25 | 25 | nA | |
| Temperature range | –40°C | 125°C | °C | ||
| Package | SOT-23 (6-pin), WSON (6-pin) |
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
- User-adjustable reset delay time using an external capacitor
- Internal pullup resistance on the MR pin: 70 kΩ to 90 kΩ
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 TPS3808G15DBVRG4?
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 typical quiescent current of the TPS3808G15DBVRG4?
The typical quiescent current is 2.4 μA.
- What is the threshold accuracy for VIT ≤ 3.3 V?
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 for a 300-ms delay, leaving the CT pin open for a 20-ms delay, or using an external capacitor for a user-defined delay between 1.25 ms and 10 s.
- What are the available package options for the TPS3808G15DBVRG4?
The device is available in SOT-23 (6-pin) and WSON (6-pin) packages.
- What is the temperature range for the TPS3808G15DBVRG4?
The device is fully specified 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 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.
- Can the TPS3808G15DBVRG4 be used in battery-powered applications?
Yes, it is well-suited for battery-powered applications due to its low quiescent current.
- How can the threshold voltage be adjusted for the TPS3808G01 version?
The threshold voltage for the TPS3808G01 can be adjusted using an external resistor divider to monitor any voltage rail down to 0.405 V.
