This document introduces the features and characteristics of the ADM1073 hot swap controller.
The ADM1073 is a full‑feature, negative‑voltage hot‑swap controller designed for safe insertion and removal of boards in live –48 V backplane systems. It provides precise inrush current limiting, programmable over‑ and undervoltage detection, and a configurable PWM retry scheme for charging large capacitive loads.
The document includes a functional block diagram, pin‑out description, electrical specifications, absolute maximum ratings, thermal characteristics, and typical performance curves, along with recommended application circuits for servers, storage arrays, and telecommunications equipment.
| Operating Supply Voltage Range (Vin Pin) | 11.7 V – 12.9 V |
|---|---|
| Maximum Voltage Range | -200 V – -18 V |
| Number of Consecutive PWM Retry Cycles | 7 |
| Current Limit On‑Time (ton) | 6 ms (typical) |
The device can tolerate transient voltages up to –200 V and operates between –48 V (typical) and –18 V (maximum).
The ADM1073 allows up to seven consecutive PWM retry cycles; after the seventh attempt the part latches shutdown.
The UV pin provides undervoltage detection and the OV pin provides overvoltage detection.
PWRGD is an open‑drain output that signals when the hot‑swap operation is complete and the load capacitance is fully charged.