General Description
The MAX917–MAX920 nanopower comparators in space-saving SOT23 packages feature Beyond-the-Rails™ inputs and are guaranteed to operate down to +1.8V. The MAX917/MAX918 feature an on-board 1.245V ±1.5% reference and draw an ultra-low supply current of only 750nA, while the MAX919/MAX920 (without reference) require just 380nA of supply current. These features make the MAX917–MAX920 family of comparators ideal for all 2-cell battery applications, including monitoring/management.

Features
♦ Ultra-Low Supply Current
   380nA per Comparator (MAX919/MAX920)
   750nA per Comparator with Reference
   (MAX917/MAX918)
♦ Guaranteed to Operate Down to +1.8V
♦ Internal 1.245V ±1.5% Reference
   (MAX917/MAX918)
♦ Input Voltage Range Extends 200mV
   Beyond-the-Rails
♦ CMOS Push-Pull Output with ±8mA Drive
   Capability (MAX917/MAX919)
♦ Open-Drain Output Versions Available
   (MAX918/MAX920)
♦ Crowbar-Current-Free Switching
♦ Internal Hysteresis for Clean Switching
♦ No Phase Reversal for Overdriven Inputs
♦ Space-Saving SOT23 Package

Applications
   2-Cell Battery Monitoring/Management
   Ultra-Low-Power Systems
   Mobile Communications
   Notebooks and PDAs
   Threshold Detectors/Discriminators
   Sensing at Ground or Supply Line
   Telemetry and Remote Systems
   Medical Instruments