Maxim MAX6877 - Manual
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MICROPROCESSOR SUPERVISOR CIRCUITS
Keywords:
sequencing, sequencer, monitor, reset, voltage tracking, voltage tracker
Sep 20, 2006
APPLICATION NOTE 3918
User's Guide for the MAX6877 Power-Supply Tracker/Sequencer
Abstract: This application note is a step-by-step User's Guide for designing with the MAX6877 voltage tracker and
sequencer. The note explains how to make suitable component calculations.
Figure 1. The basic circuit for the MAX6877.
Overview
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Tracks or sequences up to three voltages
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Closed-loop tracking control with programmable slew rate
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Program thresholds with resistors
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Program slew rate and timing delays with capacitors
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Fault output and power-good output
Description
The MAX6877 voltage tracker/sequencer can track or sequence up to three voltages. Use the TRACK/SEQ pin to select
tracking or sequencing. The device will either track or sequence the three voltages, but it cannot track and sequence
simultaneously. Power-up begins when EN/active-low UV is asserted and all three input voltages are above their
thresholds. In the example circuit in
Figure 1
, EN/active-low UV is connected to the 12V bus, so the circuit will turn
on when the bus exceeds its threshold and turn off when it falls under its threshold.
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