DESCRIPTION
The SG1548 is an integrated circuit capable of monitoring up to four positive DC supply voltages simultaneously for overvoltage and undervoltage fault conditions. An on-chip inverting op amp also allows monitoring one negative DC voltage. The fault tolerance window is accurately programmable from ±5% to ±40% using a simple divider network on the 2.5V reference.

FEATURES
• Monitors four DC voltages and the AC line
• Precision 2.5V ±1% low-drift reference
• Fault tolerance adjustable from ±5% to ±40%
• ±3% trip threshold tolerance over temperature
• Separate 10mA, 40V overvoltage, undervoltage and AC line fault outputs
• Fault delay programmable with a single capacitor
• 30mV comparator hysteresis to prevent oscillations
• On-chip inverting op amp for negative voltage
• Open-collector output logic or expandability
• Operation from 4.5V to 40V supply