The MAX9025-MAX9028 ultra-low-power comparators are integrated circuits in a space-saving chip-scale (UCSP) package with Beyond-the-Rails inputs that 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. 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 MAX9025/MAX9027 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 5mA. The MAX9026/MAX9028 have an open-drain output stage that makes them suitable for mixed-voltage system design. All devices are available in the miniature 6-bump UCSP packages. For similar comparators in 5-pin SC70 packages, refer to the MAX9117 data sheet, and for similar dual comparators in 8-pin SOT23 packages, refer to the MAX9017 data sheet. Applications include 2-cell battery monitoring/management, ultra-low-power systems, mobile communications, notebooks and PDAs, sensing at ground or supply line, telemetry and remote systems, and medical instruments.
The MAX9025–MAX9028 family are nanopower comparators offered in a space‑saving 6‑bump UCSP package. They feature Beyond‑the‑Rails inputs, internal 1.236 V ±1 % reference (MAX9025/MAX9026), and ultra‑low supply currents of 1 µA (with reference) or 0.6 µA (without reference). The push‑pull versions (MAX9025/MAX9027) provide ±5 mA rail‑to‑rail output drive, while the open‑drain versions (MAX9026/MAX9028) support mixed‑voltage designs.
These devices operate from –40 °C to +85 °C and are suited for 2‑cell battery‑monitoring, low‑power mobile, medical and telemetry applications. The datasheet includes electrical characteristics, absolute maximum ratings, typical operating curves, pin configurations, and application notes such as zero‑crossing detector circuits.
| Supply Current (with reference) | 1 µA |
|---|---|
| Supply Current (without reference) | 0.6 µA |
| Output Current | ±5 mA |
| Supply Voltage Range | 1.8 V – 5.5 V |
| Operating Temperature Range | -40 °C to +85 °C |
The MAX9025 draws an ultra‑low supply current of 1 µA.
The MAX9025 includes an on‑board 1.236 V ±1 % reference.
They are guaranteed to operate down to +1.8 V.