Overview
The TPS3851G18SDRBR, produced by Texas Instruments, is a high-accuracy voltage supervisor with an integrated watchdog timer. This device combines precision undervoltage monitoring with a programmable watchdog timer, making it ideal for use in systems requiring tight voltage tolerance. The TPS3851 achieves a 0.8% accuracy for the undervoltage threshold over a temperature range of –40°C to +125°C and includes accurate hysteresis to ensure reliable operation. It is available in a small 3-mm × 3-mm, 8-pin VSON package, making it suitable for a variety of applications where space is limited.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 1.6 to 6.5 | V |
| Voltage Threshold Accuracy | 0.8% | - |
| Quiescent Current (Typical) | 10 | µA |
| Operating Temperature Range | -40 to 125 | °C |
| Package Type | VSON (DRB) | - |
| Number of Pins | 8 | - |
| Package Size | 3-mm × 3-mm | - |
| Watchdog Timeout Programming | External Capacitor or Factory-Programmed | - |
| Reset Delay Accuracy | 15% | - |
| Output Type | Open-Drain | - |
Key Features
- Precision undervoltage monitoring with 0.8% accuracy over the temperature range of –40°C to +125°C.
- Low quiescent current of 10 µA (typical).
- User-programmable watchdog timeout using an external capacitor or factory-programmed default delay settings.
- Open-drain outputs for RESET and watchdog (WDO).
- Supports common rails from 1.8 V to 5.0 V with 4% and 7% undervoltage thresholds available.
- 0.5% hysteresis on the undervoltage threshold.
- Watchdog disable feature via logic pins.
- Manual reset input (MR) for initiating a reset.
- Available in a small 3-mm × 3-mm, 8-pin VSON package.
- Junction operating temperature range: –40°C to +125°C.
Applications
- WLAN/Wi-Fi access points.
- Wireless security cameras.
- IP network cameras.
- String inverters.
- Blood pressure monitors.
- Electricity meters.
Q & A
- What is the input voltage range of the TPS3851G18SDRBR?
The input voltage range is from 1.6 V to 6.5 V.
- What is the accuracy of the voltage threshold for the TPS3851G18SDRBR?
The voltage threshold accuracy is 0.8% over the temperature range of –40°C to +125°C.
- How is the watchdog timeout programmed in the TPS3851G18SDRBR?
The watchdog timeout can be programmed using an external capacitor or by factory-programmed default delay settings.
- What type of outputs does the TPS3851G18SDRBR have?
The device has open-drain outputs for RESET and watchdog (WDO).
- What is the quiescent current of the TPS3851G18SDRBR?
The typical quiescent current is 10 µA.
- What is the operating temperature range of the TPS3851G18SDRBR?
The operating temperature range is from –40°C to +125°C.
- How can the watchdog timer be disabled in the TPS3851G18SDRBR?
The watchdog timer can be disabled via logic pins to avoid undesired watchdog timeouts during development.
- What is the package type and size of the TPS3851G18SDRBR?
The device is available in a 3-mm × 3-mm, 8-pin VSON package.
- What are some common applications of the TPS3851G18SDRBR?
Common applications include WLAN/Wi-Fi access points, wireless security cameras, IP network cameras, string inverters, blood pressure monitors, and electricity meters.
- How does the manual reset input (MR) function in the TPS3851G18SDRBR?
A logic low on the MR pin initiates a reset. After MR returns to a logic high and VDD is above the undervoltage threshold plus hysteresis, the RESET is deasserted after the reset delay time.
