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. The unique design of the output stage limits supply-current surges while switching, virtually eliminating the supply glitches typical of many other comparators. This design also minimizes overall power consumption under dynamic conditions. The MAX917/MAX919 have a push-pull output stage that sinks and sources current. Large internal output drivers allow rail-to-rail output swing with loads up to 8mA. The MAX918/MAX920 have an open-drain output stage that makes them suitable for mixed-voltage system design. 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 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 MAX917EUK-T 5 SOT23-5 ADIQ U5-1 MAX917ESA 8 SO — S8-4 MAX918EUK-T 5 SOT23-5 ADIR U5-1 MAX918ESA 8 SO — S8-4 MAX919EUK-T 5 SOT23-5 ADIS U5-1 MAX919ESA 8 SO — S8-4 MAX920EUK-T 5 SOT23-5 ADIT U5-1 MAX920ESA 8 SO — S8-4
