The document introduces the ADM1075 −48 V hot swap controller and digital power monitor. The product features constant power foldback for FET SOA protection, precision current and voltage measurement with an accuracy of less than 1.0%, controls for inrush and faults for negative supply voltages, suitability for wide input range due to internal shunt regulator, 25 mV/50 mV full-scale sense voltage, fine tune current limit with standard sense resistor, soft start inrush current limit profiling, 1% accurate UVH and OV pins, 1.5% accurate UVL pin, PMBus interface for control, telemetry, and fault recording, and a junction temperature operating range of −40°C to 105°C.
The ADM1075 is a full‑feature, negative‑voltage hot‑swap controller with constant‑power foldback and a 12‑bit ADC for precise current and voltage monitoring. It protects boards during insertion and removal from a live –48 V backplane, offering adjustable current limiting, soft‑start, and fault‑recording capabilities.
The handbook provides product highlights, functional block diagrams, pin descriptions, electrical specifications, PMBus command reference, and timing diagrams. It also covers application notes for telecommunications, data‑center servers, and distributed power systems, as well as detailed configuration and retry schemes.
| Voltage Transient Immunity | —200 V |
|---|---|
| Operating Supply Voltage Range (VIN) | 11.5 V – 13 V |
| Quiescent Supply Current | 5.5 mA (VIN=13 V) |
| Undervoltage Rising Threshold (Vuva) | 0.99 V – 1.01 V |
| Overvoltage Rising Threshold (Vove) | 0.99 V – 1.01 V |
| Gain of Current Sense Amplifier | 50/25 V/V |
| ADC_V/ADC_AUX Absolute Accuracy | 0.8 + 0.8 % |
Inrush current is limited by a programmable current limit set via the ISET pin and a built‑in soft‑start function that uses an external capacitor on the SS pin.
Up to four unique I²C addresses can be created, depending on the configuration of the ADR pin.
The GPO1/ALERT1/CONV and GPO2/ALERT2 pins can be used to signal fault or warning conditions to a host controller.