The ISL6142/52 are 14-pin, negative voltage hot plug controllers that allow a board to be safely inserted and removed from a live backplane. Inrush current is limited to a programmable value by controlling the gate voltage of an external N-channel pass transistor. If the input voltage is less than the Under-Voltage threshold or greater than the Over-Voltage threshold, the pass transistor is turned off. The PWRGD/PWRGD outputs can be used to directly enable a power module. When the Gate and DRAIN voltages are both considered good, the output is latched in the active state. The IntelliTripTM electronic circuit breaker and programmable current limit features protect the system against short circuits. When the Over-Current threshold is exceeded, the output current is limited for a time-out period before the circuit breaker trips and shuts down the FET. The time-out period is programmable with an external capacitor connected to the CT pin. If the fault disappears before the programmed time-out, normal operation resumes. In addition, the IntelliTripTM electronic circuit breaker has a fast Hard Switch feature that can instantly turn off the FET when the current reaches the Over-Current threshold.
The ISL6142/ISL6152 devices protect live backplane insertion by limiting inrush current and monitoring gate, drain, and supply voltages. They include programmable over‑current, over‑voltage, under‑voltage, and time‑out functions, as well as a fast hard‑fault shutdown.
The datasheet provides pin‑out diagrams, electrical specifications, absolute maximum ratings, and recommended application circuits for telecom, VoIP servers, and wireless base‑station power supplies.
| Supply Voltage Range (Vpp) | 20 V to 80 V |
|---|---|
| UVLO High Threshold Voltage | 15 V to 19 V |
| Current Limit Trip Voltage (SENSE) | 50 mV |
| UV Pin Low Threshold Voltage | 1.105 V to 1.145 V |
The Vpp pin operates from 20 V up to 80 V.