The LT1640L/LT1640H is an 8-pin, negative voltage Hot Swap controller that allows safe board insertion and removal from a live -48V backplane. It features programmable inrush current, electronic circuit breaker, overvoltage protection, and undervoltage lockout.
The LT1640L/LT1640H is an 8‑pin negative‑voltage hot‑swap controller that safely inserts and removes boards from a live backplane. It limits inrush current, monitors over‑ and undervoltage conditions, and provides a programmable electronic circuit breaker.
The device operates from a supply voltage of 10 V to 80 V, offers programmable thresholds, and is available in PDIP and SO‑8 packages. Pin functions include Power‑Good output, over‑/undervoltage inputs, sense, gate drive, and drain monitoring.
| PWRGD Output Low Voltage at 5 mA | 1.5 V to 3.0 V |
|---|---|
| Package | 8‑Lead Plastic Small Outline (Narrow .150 in) |
The PWRGD pin is the Power Good Output that toggles when the internal voltage is within the programmed threshold, allowing direct connection to a power‑module enable pin.
The OV pin is an analog overvoltage input; when the voltage exceeds its high‑to‑low threshold, the GATE pin is pulled low to shut off the external pass transistor.
The device is offered in 8‑lead PDIP and SO‑8 surface‑mount packages.