1 Features
• AEC-Q100 qualified with the following results:
– Device temperature grade 1: –40°C to 125°C
ambient operating temperature range
• Input voltage range: VDD = 1.04 V to 6.0 V
• Ultra low supply current: IDD = 250 nA (typical)
• Factory programmed or user-programmable
watchdog timeout
– ±10% Accurate timer (maximum)
– Factory programmed: 1 msec to 100 sec
• Factory programmed or user-programmable reset
delay
– ±10% Accurate timer (maximum)
– Factory programmed option: 2 msec to 10 sec
• Open-drain, push-pull; active-low outputs
• Various programmability options:
– Watchdog enable-disable
– Watchdog startup delay: no delay to 10 sec
– On the fly timer extension: 1X to 256X
– Latched output option
• MR functionality support

2 Applications
• On-board (OBC) and wireless charger
• Driver monitoring
• Battery Management System (BMS)
• Front camera
• Surround view system ECU

3 Description
The TPS3435-Q1 is an ultra-low power consumption
(250 nA typical) device offering a programmable
watchdog timer.
The TPS3435-Q1 offers a high accuracy watchdog
timer with a host of features for a wide variety
of applications. The watchdog timer can be factory
programmed or user programmed using an external
capacitor. The timer value can be changed on-thefly
using a combination of logic pins. The watchdog
feature can be enabled or disabled using a dedicated
pin or combination of timer extension pins. The device
also offers start-up delay options to disable watchdog
monitoring for fixed time immediately after host power
up.
The WDO delay can be set by factory-programmed
default delay settings or programmed by an external
capacitor. The device also offers a latched output
operation where the output is latched until the
watchdog fault is cleared.
The TPS3435-Q1 is available in a small 8-pin SOT23
package.