
General Description
The MAX9025–MAX9028 nanopower comparators in
space-saving chip-scale (UCSP) packages feature
Beyond-the-Rails inputs and are guaranteed to oper-
ate down to +1.8V. The MAX9025/MAX9026 feature an
on-board 1.236V ±1% reference and draw an ultra-low
supply current of only 1A, while the MAX9027/
MAX9028 (without reference) require just 0.6A 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 suit-
able for mixed-voltage system design. All devices are
available in the miniature 6-bump UCSP packages.
Refer to the MAX9117 data sheet for similar comparators
in 5-pin SC70 packages and the MAX9017 data sheet for
similar dual comparators in 8-pin SOT23 packages.
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
Features
Space-Saving UCSP Package (1mm x 1.52mm)
Ultra-Low Supply Current
0.6A (MAX9027/MAX9028)
1A 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
MAX9025–MAX9028
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
________________________________________________________________ Maxim Integrated Products
1
Typical Application Circuit appears at end of data sheet.
Pin Configurations
Selector Guide
Ordering Information
Beyond-the-Rails and UCSP are trademarks of Maxim Integrated
Products, Inc.
19-3241; Rev 1; 6/11
PART
TEMP
RANGE
BUMP-
PACKAGE
TOP
MARK
MAX9025EBT+T -40°C to +85°C
6 UCSP
ADB
MAX9026EBT+T -40°C to +85°C
6 UCSP
ADC
MAX9027EBT+T -40°C to +85°C
6 UCSP
ADD
MAX9028EBT+T -40°C to +85°C
6 UCSP
ADE
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
PART
INTERNAL
REFERENCE
OUTPUT
TYPE
SUPPLY
CURRENT
(A)
MAX9025
Yes
Push-Pull
1.0
MAX9026
Yes
Open-Drain
1.0
MAX9027
No
Push-Pull
0.6
MAX9028
No
Open-Drain
0.6
TOP VIEW
(BUMPS ON BOTTOM)
UCSP
MAX9025–
MAX9028
1
2
3
VCC
A
B
OUT
VEE
IN+
REF
(VEE)
IN-
( ) MAX9027/MAX9028 PINS
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.