ZHCSQ77B February 2023 – June 2024 TPS25948
PRODUCTION DATA
The following table summarizes the device response to various fault conditions. Additionally, an active low external fault indication (FLT) pin is available on the TPS259480x variants.
| Event | Protection Response | Fault Latched Internally | FLT Pin Status (1) | FLT Assertion Delay(1) |
|---|---|---|---|---|
Overtemperature | Shutdown | Y | L | |
Undervoltage (UVP or UVLO) | Shutdown | N | H | |
Input Overvoltage | Shutdown | N | H | |
Transient Overcurrent (ILIM < IOUT < 2 × ILIM or IFFT for duration less than tITIMER) | None | N | H | |
| Persistent Overcurrent | Current Limit | N | L | tITIMER |
Output Short-Circuit to GND | Circuit Breaker followed by Current Limit | N | H | |
ILM Pin Open (During Steady State) | Shutdown | N | H | |
ILM Pin Shorted to GND | Shutdown | Y | L | |
Reverse Current ((VOUT - VIN) > VREVTH) | Reverse Current Blocking | N | H |
Faults which are latched internally can be cleared either by power cycling the part (pulling VIN to 0 V) or by pulling the EN/UVLO pin voltage below VSD(F). This also releases the FLT pin pull-down for the TPS259480x variants and resets the tRST timer for the TPS25948xA (auto-retry) variants.
During a latched fault, pulling the EN/UVLO just below the UVLO threshold has no impact on the device. This is true for both TPS25948xL (latch-off) and TPS25948xA (auto-retry) variants.
For TPS25948xA (auto-retry) variants, on expiry of the tRST timer after a fault, the device restarts automatically and the FLT pin is de-asserted (TPS259480A variant).