STMicroelectronics STEC01 Ground Path Safety Switch
STMicroelectronics STEC01 Ground Path Safety Switch features an integrated programmable 12mΩ power switch managed by the timer-based circuitry. The STMicroelectronics STEC01 offers three timers designed to interrupt the ground path of a power application. This is after a maximum on-time which restrains the restart of the platform during a cooling window. Additional features include a maximum on-time that can be set from a few seconds to hundreds of seconds and a cooling window that can be programmed to 1, 5, and 20 minutes. Timing can be set using three multi-level input pins, joined with a programmable oscillator and a fixed oscillator.
Internal logic and counters start on the STEC01 Ground Path Safety Switch when an input continuous or pulsed signal is applied to the pulse-width modulation (PWM) pin. When the activity on the PWM pin stops, the device automatically enters idle mode, waiting for a new valid PWM signal to be applied in normal operation. When a fault condition is detected by the STEC01 Switch, a reset pulse is created, and the safety MOSFET is turned off and arranged according to a predefined state machine.
The STMicroelectronics STEC01 Ground Path Safety Switch provides a continuous current capability up to 7A, through the internal power MOSFET. If a higher current is required, an external power transistor driven through the GDRV pin will support the higher current. The HW_RESET input pin features a rising edge, this generates a 50ms pulse on the RESET_FAULT pin and can be used to notify the connection of an external power source (e.g. USB).
Features
- 2.2V to 5V input voltage range from
- 12mΩ typical N-channel FET RDS(on)
- 7A continuous current capability
- 4Hz to 5kHz PWM control signal, with 30% to 100% duty cycle
- 30µA battery supply current
- T1, T3 programmable timers
- 1 fixed timer T2
- Input undervoltage lockout
- 3mm x 3mm x 0.9mm 16L, 0.5mm pitch VFQFPN package
Applications
- Timing/reset circuitry
- Ground path protection circuitry
Block Diagram
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