1 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 outputs
• Precision undervoltage monitoring:
– Supports common rails from 1.8V to 5.0V
– 4% and 7% Undervoltage thresholds available
– 0.5% Hysteresis
• Watchdog disable feature
• Factory-programmed precision watchdog and
reset timers
• Manual reset input (MR)
• Available in a small 3mm × 3mm, 8 pin VSON
package
• Junction operating temperature range:
–40°C to +125°C

2 Applications
• WLAN/Wi-Fi access point
• Wireless security camera
• IP network camera
• String inverter
• Blood pressure monitor
• Electricity meter

3 Description
The TPS3851 combines a precision voltage
supervisor with a programmable watchdog timer. The
TPS3851 comparator achieves a 0.8% accuracy
(–40°C to +125°C) for the undervoltage (VITN)
threshold on the VDD pin. The TPS3851 also includes
accurate hysteresis on the undervoltage threshold
making the device an excellent choice for use with
tight tolerance systems. The supervisor RESET delay
features a 15% accuracy, high-precision delay timing.
The TPS3851 includes a programmable watchdog
timer for a wide variety of applications. The dedicated
watchdog output (WDO) enables increased resolution
to help determine the nature of fault conditions.
The watchdog timeouts can be programmed either
by an external capacitor, or by factory-programmed
default delay settings. The watchdog can be disabled
via logic pins to avoid undesired watchdog timeouts
during the development process.
TPS3851 is available in a small 3.00mm × 3.00mm,
8-pin VSON package.