General Description
The MAX9025/MAX9028 nanopower comparators in space-saving chip-scale (UCSP™) packages feature Beyond-the-Rails™ inputs and are guaranteed to operate down to +1.8V. The MAX9025/MAX9026 feature an on-board 1.236V ±1% reference and draw an ultralow supply current of only 1µA, while the MAX9027− MAX9028 (without reference) require just 0.6µA of supply current. These features make the MAX9025-MAX9028 family of comparators ideal for all 2-cell batterymonitoring/management applications.

Features
● Space-Saving UCSP Package (1mm x 1.52mm)
● Ultra-Low Supply Current
    • 0.6µA (MAX9027/MAX9028)
    • 1µA with Reference (MAX9025/MAX9026)
● Guaranteed to Operate Down to +1.8V
● Internal 1.236V ±1% Reference (MAX9025/ MAX9026)
● Input Voltage Range Extends 200mV Beyond-the-Rails
● CMOS Push-Pull Output with ±5mA Drive Capability (MAX9025/MAX9027)
● Open-Drain Output Versions Available (MAX9026/ MAX9028)
● Crowbar-Current-Free Switching
● Internal Hysteresis for Clean Switching
● No Phase Reversal for Overdriven Inputs

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