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STMPS2242 Datasheet(PDF) 8 Page - STMicroelectronics

Part # STMPS2242
Description  Enhanced dual-channel power switches
Download  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STMPS2242 Datasheet(HTML) 8 Page - STMicroelectronics

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Functional description
STMPS2242, STMPS2252, STMPS2262, STMPS2272
8/42
Doc ID 15050 Rev 3
3
Functional description
3.1
Fault blanking
The STMPS devices feature a 10 ms fault blanking. Fault blanking allows current-limit faults,
including momentary short-circuit faults that occur when hot-swapping a capacitive load,
and also ensures that no fault is issued during power-up. When a load transient causes the
device to enter current limit, an internal counter starts. If the load fault persists beyond the
10 ms fault-blanking timeout, the FAULT output asserts “low”. Load-transient faults less than
10 ms (typ.) do not cause a FAULT output assertion. Only current-limit faults have fault-
blanking. Die overtemperature faults and input voltage drops below the UVLO threshold
cause an immediate fault output.
3.2
Overcurrent/overtemperature protection
In overcurrent or short-circuit condition, the switch limits the current at 500 mA for
STMPS2242/STMPS2252 and 1000 mA for STMPS2262/STMPS2272. If the temperature
of the die goes above the limit value, the switch turns OFF.
3.3
Reverse current blocking
When the switch is OFF, or when the STMPS device is not powered (VCC=0 V), the switch
behaves as a Hi-Z at the output pin, ensuring that no reverse current will flow into the device
when VI<VO.
Note:
In the case where the switch is ON, and a voltage higher than VI is applied to the OUT pin, a
reverse current will occur.
3.4
UVLO
When the input voltage drops below the threshold value, the power switch turns OFF to
prevent improper operation due to low voltage.


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