Design Win

Ground Path Safety Switch with programmable timers

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Product overview


The STEC01 is an integrated programmable 12 mΩ power switch managed by the timer based circuitry.

The device has 3 timers designed to interrupt the ground path of a power application after a maximum on-time and inhibits the restart of the platform during a cooling window. The maximum on-time can be set from few seconds to hundreds of seconds, while the cooling window can be programmed to 69, 345 and 1380 seconds.

3 multi-level input pins, combined with a programmable oscillator and a fixed oscillator, are used to set the timing.

An input continuous or pulsed signal applied to the PWM pin starts the internal logic and counters. In case of a normal operation, as soon as the activity on the PWM pin stops, the device automatically enters idle mode, waiting for a new valid PWM signal to be applied. If the device detects a fault condition, a reset pulse is generated and the safety MOSFET is turned off and managed according to a predefined state machine.

The STEC01 has a continuous current capability up to 7 A through the internal power MOSFET. A higher current can be supported by using an external power transistor driven through GDRV pin.

A rising edge on the HW_RESET input pin generates a 57 ms pulse on the RESET_FAULT pin. This function can be used to notify the connection of an external power source (e.g. USB).

  • All features

    • Input voltage range from 2.2 to 5 V
    • 12 mΩ typ. N-channel FET RDS(on)
    • 7 A continuous current capability
    • PWM control signal from 4 Hz to 5 kHz, with 30% to 100% duty cycle
    • 30 µA battery supply current
    • 2 programmable timers: T1, T3
    • 1 fixed timer T2
    • Input undervoltage lockout
    • VFQFPN 3x3x0.9 16L, 0.5 mm pitch package

EDA Symbols, Footprints and 3D Models

STMicroelectronics - STEC01

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Quality and Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
QFN-16L Industrial Ecopack2




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(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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