General Description

The NCP81428 is a PMBus® enabled, 12 V, 50 A resettable in−line

fuse designed for comprehensive protection against over current

events, over voltage events, short circuit events, and excessive inrush

current. The NCP81428 consists of a 0.65 m NMOS FET, a high

performance Hot−Swap Controller, and a Non−Volatile Memory

(NVM) all co−packaged into a LQFN32 package. The NCP81428 can

be configured as a single−phase solution, or in multi−phase as a

Master or a Slave to support higher current applications.

Power Features

• Up to 80 A Peak Output Current, 50 A Continuous

• VIN Operating Range: 5 to 18 V

• Up to 30 V Standby (PowerFet Off) Operation

• 0.65 m Path Resistance

Control Features

• Enabled by Pin Assertion and/or Through PMBus

• Output Pulldown Selection Via PMBus

• External Soft−Start Programming

• Programmable VIN Under Voltage Warning and Overvoltage Fault

• Programmable OCP Levels and Timers

• Soft Start Current Balancing between Parallel Units

Other Features

• Co−packaged Power Switch, Hotswap Controller and NVM

• (TWI) Two Wire Interface between Master and Slave(s)

• PMBus 1.4 Compliant for Telemetry

• ±2% IMON Accuracy at 30 A and Higher

• 10−bit ADC for IOUT, VIN, IOUT_pk, VOUT, VTEMP

• Parallel Operation for High Current Applications

• Excellent Current Balancing in Parallel Operations

• Over−temperature Shutdown

• FAULT#_C & FAULT#_D Multi−purpose Pins

• Internal FET Health Diagnostics

• Soft−start Current Limiting For SOA Protection

• Excessive Soft−start Duration Protection

• Fault Event and Peak Current Recording

• Programmable Auto Retry/Latch off Options

• 5 mm x 5 mm LQFN32 Package

• Operating Temperature: −40°C to +125°C

Applications

• Servers

• Data Storage

• Base Stations

• Industrial Applications