MAX6459 Datasheet

• Wide Supply Voltage Range, 4V to 28V
• Internal 2.25V ±2.5% Reference
• Low Current (3.5µA, typ at 12V)
• Open-Drain n-Channel Output (28V Compliant)
• Internal Threshold Hysteresis Options (8.3%)
• Two IN-to-OUT Timeout Period Options (50µs, 150ms)
• Internal Undervoltage Lockout
• Immune to Short Voltage Transients
• Small SOT23 Packages
• Few External Components
• Fully Specified from -40°C to +125°C
• Enables Functional Safety at System Level
• AEC-Q100 Qualified (MAX6459UTA/V+ only)

• Automotive
• Industrial
• Multicell Battery-Stack Powered Equipment
• Networking
• Notebooks, eBooks
• Overvoltage Monitoring/Protection
• Telecom
• Undervoltage Monitoring/Shutdown
• Window Voltage Detection Circuitry

The MAX6459 high supply voltage, low-power voltage monitors operate over a 4V to 28V supply voltage range. Each device includes a precision bandgap reference, one or two low-offset voltage comparators, internal threshold hysteresis, power-good or reset timeout options, and one or two high-voltage open-drain outputs. Two external resistors (three for window detection) set the trip threshold voltages.

The MAX6459 includes dual overvoltage/undervoltage comparators with two independent comparator outputs. Use the MAX6459 as a window comparator with separate undervoltage and overvoltage outputs or as two independent, single voltage monitors. The inverting and noninverting inputs of the comparator are externally accessible to support positive or negative voltage monitors and to configure the device for active-high or active-low output logic.

The MAX6459 offer only a fixed 50µs timeout period. Internal threshold hysteresis options (8.3% for the MAX6459) reduce output chatter in noise-sensitive applications. Each device is available in a small SOT23 package and specified over the extended temperature range of -40°C to +125°C.