Overview
The TPS3808G01DBVRG4 is a low quiescent current, programmable-delay supervisory circuit IC produced by Texas Instruments. This device is designed to monitor voltage rails and provide reset signals when the monitored voltage falls below a specified threshold. It is highly versatile, allowing for a wide range of voltage threshold and reset delay time adjustments, making it suitable for various applications.
Key Specifications
| Parameter | Value | Conditions |
|---|---|---|
| Supply Voltage (VDD) | 1.7 V to 6.5 V | -40°C < TJ < 125°C |
| Supply Current (IDD) | 2.4 μA to 5 μA | VDD = 3.3 V, RESET not asserted, MR, RESET, CT open |
| Low-level Output Voltage (VOL) | 0.3 V to 0.4 V | 1.3 V ≤ VDD < 1.8 V, IOL = 0.4 mA; 1.8 V ≤ VDD ≤ 6.5 V, IOL = 1 mA |
| Power-up Reset Voltage (VPOR) | 0.8 V | VOL (max) = 0.2 V, I RESET = 15 μA |
| Negative-going Input Threshold Accuracy (VIT) | -2% ±1% to -1.5% ±0.5% | VIT ≤ 3.3 V; 3.3 V < VIT ≤ 5.0 V |
| Hysteresis on VIT Pin (VHYS) | 1.5% to 3% | TPS3808G01 |
| Internal Pullup Resistance (R_MR) | 70 kΩ to 90 kΩ | |
| Input Current at SENSE Pin (ISENSE) | -25 nA to 25 nA | VSENSE = VIT |
| RESET Leakage Current (IOH) | 300 nA | V_RESET = 6.5 V, RESET not asserted |
| Input Capacitance (CIN) | 5 pF | Any pin, VIN = 0 V to VDD or 6.5 V |
Key Features
- Adjustable Voltage Threshold: The TPS3808G01 can be set to any voltage above 0.405 V using an external resistor divider, and fixed versions are available with thresholds from 0.82 V to 5 V.
- Programmable Reset Delay: Two preset delay times (20 ms and 300 ms) are available, and custom delay times can be set using a capacitor between the CT and GND pins.
- Low Quiescent Current: The device operates with a low supply current, making it suitable for battery-powered and power-sensitive applications.
- SENSE Input: Allows monitoring of any system voltage, with built-in hysteresis for smooth reset assertions and de-assertions.
- Immunity to Transients: The device is relatively immune to short negative transients on the SENSE pin, reducing the impact of transient voltages.
Applications
- Power Management Systems: Ideal for monitoring and managing power rails in various electronic systems.
- Battery-Powered Devices: Suitable for battery-powered devices due to its low quiescent current.
- Industrial Control Systems: Can be used in industrial control systems to ensure reliable operation and reset capabilities.
- Consumer Electronics: Applicable in consumer electronics for voltage monitoring and reset functions.
Q & A
- What is the operating voltage range of the TPS3808G01?
The operating voltage range is from 1.7 V to 6.5 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 it open for a 20-ms delay, or using a capacitor between CT and GND for custom delay times.
- What is the purpose of the SENSE input pin?
The SENSE input pin allows monitoring of any system voltage, and if the voltage drops below the specified threshold, it asserts the RESET signal.
- How does the device handle transient voltages?
The device is relatively immune to short negative transients on the SENSE pin, and using a bypass capacitor can further reduce sensitivity to transients.
- What are the available fixed voltage thresholds for the TPS3808?
Fixed versions are available with thresholds from 0.82 V to 3.3 V and from 4.4 V to 5 V.
- What is the typical supply current of the TPS3808G01?
The typical supply current is around 2.4 μA to 5 μA, depending on the supply voltage and other conditions.
- Can the TPS3808G01 be used in battery-powered devices?
Yes, it is suitable for battery-powered devices due to its low quiescent current.
- How does the internal pullup resistance affect the operation?
The internal pullup resistance (70 kΩ to 90 kΩ) on the MR pin helps in logic input detection.
- What is the significance of hysteresis on the VIT pin?
The hysteresis ensures smooth RESET assertions and de-assertions, preventing oscillations around the threshold voltage.
- Can the TPS3808G01 be used to monitor very low voltage rails?
Yes, the TPS3808G01 can monitor voltage rails down to 0.405 V using an external resistor divider circuit.
