General Description

The MAX6877/MAX6878/MAX6879 multivoltage power trackers/sequencers/supervisors monitor up to three system voltages and provide proper power-up and power-down control for systems requiring voltage tracking or sequencing. These devices ensure controlled voltage tracking within a specified range or sequencing in the proper order as system power supplies are enabled. The MAX6877/MAX6878/MAX6879 generate all required voltages and timing to control up to three external n-channel pass FETs for the OUT1/OUT2/OUT3 supply voltages (see the Selector Guide for different features of each device).

Features

♦ Pin-Selectable Tracking or Sequencing Control

   for Up to Three Supply Voltages

♦ Capacitor-Adjustable Power-Up/Down Tracking

   Slew Rate

♦ Capacitor-Adjustable Power-Up Sequencing Delay

♦ Internal Charge Pumps to Enhance External

   n-Channel FETs

♦ Capacitor-Adjustable Timeout Period Power-Good

   Output (MAX6877/MAX6878)

♦ Adjustable Undervoltage Lockout or

   Logic-Enable Input

♦ Internal 100Ω Pulldown for Each Output to

   Discharge Capacitive Load Quickly

♦ 0.5V to 5.5V Nominal IN_/OUT_ Range

♦ 2.7V to 5.5V Operating Voltage Range

♦ Immune to Short Voltage Transients

♦ Small 4mm x 4mm 24-Pin or 16-Pin Thin QFN

   Packages

Applications

   Multivoltage Systems

   Networking Systems

   Telecom

   Storage Equipment

   Servers/Workstations