SOT23, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference

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 * Medical Instruments * Mobile Communications * Notebooks and PDAs * Sensing at Ground or Supply Line * Telemetry and Remote Systems * Threshold Detectors/Discriminators * Ultra-Low-Power Systems

* 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