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/MAX9181EXT-T 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.
Feature
- 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
- Medical Instruments
- Mobile Communications
- Notebooks and PDAs
- Sensing at Ground or Supply Line
- Telemetry and Remote Systems
- Threshold Detectors/Discriminators
- Ultra-Low-Power Systems
