19-3241; Rev 0; 5/04
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
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 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 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.
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
MAX9025–MAX9028
Ordering Information
PART
MAX9025EBT-T
TEMP
RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
BUMP-
PACKAGE
6 UCSP-6
6 UCSP-6
6 UCSP-6
6 UCSP-6
TOP
MARK
ADB
ADC
ADD
ADE
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
MAX9026EBT-T
MAX9027EBT-T
MAX9028EBT-T
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
B
1
A
V
CC
IN+
Selector Guide
PART
MAX9025
MAX9026
MAX9027
MAX9028
INTERNAL
REFERENCE
Yes
Yes
No
No
OUTPUT
TYPE
Push-Pull
Open-Drain
Push-Pull
Open-Drain
SUPPLY
CURRENT
(µA)
1.0
1.0
0.6
0.6
3
IN-
REF
(V
EE
)
MAX9025–
MAX9028
2
OUT
Typical Application Circuit appears at end of data sheet.
Beyond-the-Rails and UCSP are trademarks of Maxim Integrated
Products, Inc.
V
EE
( ) MAX9027/MAX9028 PINS
UCSP
________________________________________________________________
Maxim Integrated Products
1
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.
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
MAX9025–MAX9028
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
to V
EE
)..................................................+6V
Voltage Inputs (IN+, IN-, REF) .........(V
EE
- 0.3V) to (V
CC
+ 0.3V)
Output Voltage
MAX9025/MAX9027 ....................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
MAX9026/MAX9028 ..................................(V
EE
- 0.3V) to +6V
Current into Input Pins ........................................................20mA
Output Current..................................................................±50mA
Output Short-Circuit Duration .................................................10s
Continuous Power Dissipation (T
A
= +70°C)
6-Bump UCSP (derate 3.9mW/°C above +70°C)........308mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Bump Temperature (soldering) Reflow............................+235°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX9025/MAX9026 (WITH REF)
(V
CC
= +5V, V
EE
= 0V, V
IN+
= V
REF
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
SYMBOL
V
CC
I
CC
V
CC
= 1.8V
V
CC
= 5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
EE
-
0.2
0.3
4
0.15
0.1
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.001
35
3
33
3
7
6
µs
mA
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
57
250
56
250
1
2
1
350
450
200
300
350
450
200
300
1
µA
mV
mV
CONDITIONS
Inferred from the PSRR test
MIN
1.8
0.8
1.0
TYP
MAX
5.5
1.5
1.7
2.2
V
CC
+
0.2
5
10
V
mV
mV
nA
mV/V
µA
UNITS
V
IN+ Voltage Range
Input Offset Voltage
Input-Referred Hysteresis
Input Bias Current
Power-Supply Rejection Ratio
V
IN+
V
OS
V
HB
I
B
PSRR
V
CC
-
V
OH
Inferred from output swing test
(Note 2)
(Note 3)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
CC
= 1.8V to 5.5V
MAX9025, V
CC
= 5V,
I
SOURCE
= 6mA
MAX9025, V
CC
=
1.8V, I
SOURCE
= 1mA
V
CC
= 5V,
I
SINK
= 6mA
V
CC
= 1.8V,
I
SINK
= 1mA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
Output Voltage Swing High
Output Voltage Swing Low
V
OL
Output Leakage Current
I
LEAK
MAX9026 only, V
O
= 5.5V
Sourcing, V
O
= V
EE
Output Short-Circuit Current
I
SC
Sinking, V
O
= V
CC
High-to-Low Propagation Delay
(Note 4)
t
PD
-
V
CC
= 1.8V
V
CC
= 5V
2
_______________________________________________________________________________________
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
ELECTRICAL CHARACTERISTICS—MAX9025/MAX9026 (WITH REF) (continued)
(V
CC
= +5V, V
EE
= 0V, V
IN+
= V
REF
, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MAX9025 only
Low-to-High Propagation Delay
(Note 4)
t
PD+
MAX9026 only,
R
PULLUP
= 100kΩ
C
L
= 15pF
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1.224
1.205
40
C
REF
= 1nF
BW = 10Hz to 100kHz
BW = 10Hz to 6kHz
29
60
0.5
0.03
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
MIN
TYP
11
28
12
31
1.6
0.2
1.2
1.236
1.248
1.267
µs
µs
ms
V
ppm/
°C
µV
RMS
mV/V
mV/
nA
µs
MAX
UNITS
MAX9025–MAX9028
Rise Time
Fall Time
Power-Up Time
Reference Voltage
Reference Voltage Temperature
Coefficient
Reference Output Voltage Noise
Reference Line Regulation
Reference Load Regulation
t
RISE
t
FALL
t
ON
V
REF
TC
REF
E
N
∆V
REF
/
∆V
CC
∆V
REF
/
∆I
OUT
MAX9025 only, C
L
= 15pF
V
CC
= 1.8V to 5.5V
∆I
OUT
= 0nA to 100nA
ELECTRICAL CHARACTERISTICS—MAX9027/MAX9028 (WITHOUT REF)
(V
CC
= +5V, V
EE
= 0V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
Input Common-Mode
Voltage Range
Input Offset Voltage
Input-Referred Hysteresis
Input Bias Current
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
SYMBOL
V
CC
I
CC
V
CC
= 1.8V
V
CC
= 5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
EE
-
0.2
0.3
CONDITIONS
Inferred from the PSRR test
MIN
1.8
0.45
0.6
TYP
MAX
5.5
0.75
1.0
1.25
V
CC
+
0.2
5
mV
T
A
= T
MIN
to T
MAX
4
0.15
0.1
0.5
1
2
1
3
10
mV
nA
mV/V
mV/V
V
µA
UNITS
V
V
CM
Inferred from the CMRR test
-0.2V
≤
V
CM
≤
(V
CC
+ 0.2V)
(Note 2)
T
A
= +25°C
V
OS
V
HB
I
B
PSRR
CMRR
-0.2V
≤
V
CM
≤
(V
CC
+ 0.2V) (Note 3)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
CC
= 1.8V to 5.5V
(V
EE
- 0.2V)
≤
V
CM
≤
(V
CC
+ 0.2V)
_______________________________________________________________________________________
3
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
MAX9025–MAX9028
ELECTRICAL CHARACTERISTICS—MAX9027/MAX9028 (WITHOUT REF) (continued)
(V
CC
= +5V, V
EE
= 0V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MAX9027 only, V
CC
=
5V, I
SOURCE
= 5mA
MAX9028 only, V
CC
=
1.8V, I
SOURCE
= 1mA
V
CC
= 5V,
I
SINK
= 5mA
V
CC
= 1.8V,
I
SINK
= 1mA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
T
A
= +25°C
T
A
= T
MIN
to T
MAX
0.001
35
3
33
3
16
14
15
40
16
45
1.6
0.2
1.2
µs
µs
ms
µs
µs
mA
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 1.8V
V
CC
= 5V
MAX9027 only
Low-to-High Propagation Delay
(Note 4)
t
PD+
MAX9028 only
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V,
R
PULLUP
= 100kΩ
V
CC
= 5V,
R
PULLUP
= 100kΩ
Rise Time
Fall Time
Power-Up Time
t
RISE
t
FALL
t
ON
MAX9027 only, C
L
= 15pF
C
L
= 15pF
56
191
58
MIN
TYP
191
MAX
400
500
200
300
400
500
200
300
1
µA
mV
mV
UNITS
Output Voltage Swing High
V
CC
- V
OH
Output Voltage Swing Low
V
OL
Output Leakage Current
I
LEAK
MAX9028 only, V
O
= 5.5V
Sourcing, V
O
= V
EE
Output Short-Circuit Current
I
SC
Sourcing, V
O
= V
CC
High-to-Low Propagation Delay
(Note 4)
t
PD-
Note 1:
All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaranteed
by design, not production tested.
Note 2:
V
OS
is defined as the center of the hysteresis band at the input.
Note 3:
The hysteresis-related trip points are defined as the edges of the hysteresis band, measured with respect to the center of
the band (i.e., V
OS
) (Figure 2).
Note 4:
Specified with an input overdrive (V
OVERDRIVE
) of 100mV, and load capacitance of C
L
= 15pF. V
OVERDRIVE
is defined
above and beyond the offset voltage and hysteresis of the comparator input. For the MAX9025/MAX9026, reference voltage
error should also be added.
4
_______________________________________________________________________________________
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
MAX9025–MAX9028
Typical Operating Characteristics
(V
CC
= +5V, V
EE
= 0V, C
L
= 15pF, V
OVERDRIVE
= 100mV, T
A
= +25°C, unless otherwise noted.)
MAX9025/MAX9026
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9025-28 toc01
MAX9027/MAX9028
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX9025-28 toc02
MAX9025/MAX9026
SUPPLY CURRENT vs. TEMPERATURE
MAX9025-28 toc03
1200
T
A
= +85°C
SUPPLY CURRENT (nA)
1000
800
1200
700
SUPPLY CURRENT (nA)
T
A
= +85°C
600
SUPPLY CURRENT (nA)
V
CC
= 5V
1000
V
CC
= 3V
800
V
CC
= 1.8V
T
A
= +25°C
T
A
= -40°C
800
500
T
A
= +25°C
T
A
= -40°C
400
600
1.5
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
300
1.5
2.5
3.5
4.5
5.5
SUPPLY VOLTAGE (V)
600
-40
-15
10
35
60
85
TEMPERATURE (°C)
MAX9027/MAX9028
SUPPLY CURRENT vs. TEMPERATURE
MAX9025-28 toc04
MAX9025/MAX9026
SUPPLY CURRENT vs. OUTPUT
TRANSITION FREQUENCY
MAX9025-28 toc05
MAX9027/MAX9028
SUPPLY CURRENT vs. OUTPUT
TRANSITION FREQUENCY
35
SUPPLY CURRENT (µA)
30
25
20
15
10
V
CC
= 5V
V
CC
= 1.8V
0.1
1
10
100
V
CC
= 3V
MAX9025-28 toc06
800
40
35
SUPPLY CURRENT (µA)
30
25
20
15
10
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 3V
40
700
SUPPLY CURRENT (nA)
V
CC
= 5V
600
V
CC
= 3V
500
400
V
CC
= 1.8V
300
-40
-15
10
35
60
85
TEMPERATURE (°C)
5
0
0.1
1
10
5
0
100
TRANSITION FREQUENCY (kHz)
TRANSITION FREQUENCY (kHz)
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX9025-28 toc07
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX9025-28 toc08
MAX9025/MAX9027
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
OUTPUT VOLTAGE HIGH (V
CC
- V
OH
, mV)
MAX9025-28 toc09
800
800
800
OUTPUT VOLTAGE LOW (mV)
OUTPUT VOLTAGE LOW (mV)
600
V
CC
= 3V
V
CC
= 1.8V
400
600
T
A
= +25°C
400
T
A
= +85°C
200
600
V
CC
= 1.8V
400
V
CC
= 3V
200
V
CC
= 5V
T
A
= -40°C
200
V
CC
= 5V
0
0
0
2
4
6
8
10
SINK CURRENT (mA)
0
0
2
4
6
8
10
SINK CURRENT (mA)
0
2
4
6
8
10
SOURCE CURRENT (mA)
_______________________________________________________________________________________
5
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