TPS3851H25EDRBR

The TPS3851 combines a high-accuracy voltage monitor with a programmable watchdog timer. The TPS3851 comparator achieves 0.8% accuracy at the VDD pin (−40°C to +125°C) for the undervoltage (VITN) threshold. The TPS3851 also features high-accuracy hysteresis relative to the undervoltage threshold, making it an ideal choice for tight-tolerance systems. The monitor's RESET delay offers a highly precise delay time with 15% accuracy. The TPS3851 includes a programmable window watchdog timer suitable for a wide range of applications. A dedicated watchdog output (WDO) improves resolution, helping to identify the root cause of fault conditions. The watchdog timeout can be programmed via an external capacitor or configured with a factory-programmed default delay. The watchdog can be disabled via a logic pin to prevent unintended watchdog timeouts during development. The TPS3851 is available in a compact 3.00mm×3.00mm 8-pin VSON package.

Applications

• WLAN/Wi-Fi access points
• Wireless security cameras
• IP network cameras
• String inverters
• Blood pressure monitors
• Electricity meters
• Fully integrated microcontroller supervisory circuits

Key features

• Input voltage range: VDD = 1.6V to 6.5V
• 0.8% voltage threshold accuracy
• Low quiescent current: IDD = 10μA (typical)
• User-programmable watchdog timeout
• Open-drain output
• High-accuracy undervoltage monitoring:
• Supports common voltage rails from 1.8V to 5.0V
• Supports 4% and 7% undervoltage thresholds
• 0.5% hysteresis
• Watchdog disable function
• Factory-programmed precision watchdog and reset timer
• Manual reset input (MR)
• Small 3mm×3mm 8-pin VSON package
• Junction operating temperature range: -40°C to +125°C