Maxim Power Supply MAX6877 User Manual

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.  
MAX6877 Overview  
Tracks or sequences up to three voltages  
Closed-loop tracking control with programmable slew rate  
Program thresholds with resistors  
Program slew rate and timing delays with capacitors  
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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AN3918, AN 3918, APP3918, Appnote3918, Appnote 3918  
Copyright © by Maxim Integrated Products  
Additional legal notices: www.maxim-ic.com/legal  
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