ADM1178

www.DataSheet4U.com Hot Swap Controller and Digital Power Monitor with ALERTB Output ADM1178 FEATURES Allows safe board insertion and removal from a live backplane Controls supply voltages from 3.15 V to 16.5 V Precision current sense amplifier Precision voltage input 12-bit ADC for current and voltage readback Charge pumped gate drive for external N-channel FET Adjustable analog current limit with circuit breaker ±3% accurate hot swap current limit level Fast response limits peak fault current Automatic retry or latch-off on current fault Programmable hot swap timing via TIMER pin Active-high ON pin ALERTB output for overcurrent interrupt I2C® fast mode-compliant interface (400 kHz maximum) 10-lead MSOP FUNCTIONAL BLOCK DIAGRAM ADM1178 MUX VCC V 0 12-BIT ADC 1 SDA I2 C SCL ADR CURRENT SENSE AMPLIFIER I A SENSE ALERT ALERTB ON 1.3V FET DRIVE CONTROLLER GATE GND TIMER Figure 1. APPLICATIONS Power monitoring/power budgeting Central office equipment Telecommunication and data communication equipment PCs/servers 3.15V TO 16.5V RSENSE N-CHANNEL FET VCC SENSE GATE CONTROLLER P = VI SDA SCL INTERRUPT ADM1178 GENERAL DESCRIPTION The ADM1178 is an integrated hot swap controller and current sense amplifier that offers digital current and voltage monitoring via an on-chip, 12-bit analog-to-digital converter (ADC), communicated through an I2C interface. An internal current sense amplifier senses voltage across the sense resistor in the power path via the VCC pin and t...