ADM1276 is a hot swap controller and digital power and energy monitoring with PMBus interface
The ADM1276 is a hot‑swap controller that enables safe insertion and removal of circuit boards from a live backplane while providing 12‑bit ADC readback of current and voltage via a PMBus interface. It includes programmable current‑limit, foldback, over‑/under‑voltage protection, and a charge‑pump gate driver for external N‑channel FETs.
The document contains a functional block diagram, pin configuration, electrical and thermal specifications, timing characteristics, and detailed PMBus command reference. It also describes typical application circuits, fault handling, and configuration options such as soft‑start, timer, and latch behavior.
| Operating Voltage Range (VCC) | 2.95 V – 20 V |
|---|---|
| Undervoltage Lockout | 2.4 V – 2.7 V |
| Quiescent Current (ICC) | 5 mA |
| UV Threshold (UVTH) | Typical 1.0 V |
| OV Threshold (OVTH) | Typical 1.0 V |
| Current Sense Input (ISENSE) per pin | 150 µA |
The device detects a short circuit and shuts down the gate within 370 ns.
Up to four unique PMBus addresses can be selected by configuring the ADR pin.
The PWRGD pin signals when the output supply is within tolerance.