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 ultra-low 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 battery monitoring/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