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.