EVALUATION KIT AVAILABLE
MAX9025–MAX9028
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 suitable 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
Ordering Information
PART
MAX9025EBT+T
MAX9026EBT+T
MAX9027EBT+T
MAX9028EBT+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 UCSP
6 UCSP
6 UCSP
TOP
MARK
ADB
ADC
ADD
ADE
Applications
●
●
●
●
●
●
●
Selector Guide
PART
MAX9025
MAX9026
MAX9027
MAX9028
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
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
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configurations
TOP VIEW
(BUMPS ON BOTTOM)
1
B
IN+
A
V
CC
MAX9025–
MAX9028
2
REF
(V
EE
)
OUT
3
IN-
V
EE
Typical Application Circuit appears at end of data sheet.
Beyond-the-Rails and UCSP are trademarks of Maxim
Integrated Products, Inc.
( ) MAX9027/MAX9028 PINS
UCSP
19-3241; Rev 1; 6/11
MAX9025–MAX9028
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
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
Absolute Maximum Ratings
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
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
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MAX9025–MAX9028
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
High-to-Low Propagation
Delay (Note 4)
Low-to-High Propagation
Delay (Note 4)
Rise Time
Fall Time
Power-Up Time
Reference Voltage
Reference Voltage
Temperature Coefficient
Reference Output Voltage
Noise
Reference Line Regulation
Reference Load Regulation
SYMBOL
t
PD-
V
CC
= 1.8V
V
CC
= 5V
MAX9025 only
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
CONDITIONS
MIN
TYP
7
6
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
µs
t
RISE
t
FALL
t
ON
V
REF
TC
REF
EN
DV
REF
/
DV
CC
DV
REF
/
DI
OUT
MAX9025 only, C
L
= 15pF
V
CC
= 1.8V to 5.5V
DI
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
10
4
0.15
0.1
0.5
1
2
1
3
mV
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
T
A
= T
MIN
to T
MAX
V
CC
= 1.8V to 5.5V
(V
EE
- 0.2V) ≤ V
CM
≤ (V
CC
+ 0.2V)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
OS
V
HB
I
B
PSRR
CMRR
-0.2V ≤ V
CM
≤ (V
CC
+ 0.2V) (Note 3)
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MAX9025–MAX9028
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
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
= T
A
= +25°C
5V, I
SOURCE
= 5mA
T
A
= T
MIN
to T
MAX
MAX9028 only, V
CC
= T
A
= +25°C
1.8V, I
SOURCE
= 1mA T
A
= T
MIN
to T
MAX
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
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
56
MIN
TYP
191
58
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-
Rise Time
Fall Time
Power-Up Time
t
RISE
t
FALL
t
ON
MAX9027 only, C
L
= 15pF
C
L
= 15pF
Note 1:
All specifications are 100% tested at T
A
= +25°C. Specification limits over temperature (T
A
= T
MIN
to T
MAX
) are guaran-
teed 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 volt-
age error should also be added.
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MAX9025–MAX9028
UCSP, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
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
T
A
= +85ºC
SUPPLY CURRENT (nA)
1000
SUPPLY CURRENT (nA)
SUPPLY CURRENT (nA)
700
600
500
400
MAX9025-28 toc02
T
A
= +85°C
V
CC
= 5V
1000
V
CC
= 3V
800
V
CC
= 1.8V
600
T
A
= +25ºC
T
A
= -40ºC
800
T
A
= +25°C
T
A
= -40°C
600
1.5
2.5
3.5
4.5
5.5
300
1.5
2.5
3.5
4.5
5.5
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
TEMPERATURE (ºC)
MAX9025-28 toc04
MAX9025-28 toc05
SUPPLY CURRENT (nA)
700
600
500
400
300
V
CC
= 5V
V
CC
= 3V
35
SUPPLY CURRENT (µA)
30
25
20
15
10
5
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 3V
35
SUPPLY CURRENT (µA)
30
25
20
15
10
5
V
CC
= 5V
V
CC
= 1.8V
0.1
1
10
V
CC
= 3V
V
CC
= 1.8V
-40
-15
10
35
60
85
0
TEMPERATURE (ºC)
0.1
1
10
100
0
100
TRANSITION FREQUENCY (kHz)
TRANSITION FREQUENCY (kHz)
MAX9025-28 toc08
MAX9025-28 toc07
600
V
CC
= 1.8V
V
CC
= 3V
600
T
A
= +25°C
T
A
= +85°C
OUTPUT VOLTAGE HIGH (V
CC
- V
OH
, mV)
OUTPUT VOLTAGE LOW (mV)
OUTPUT VOLTAGE LOW (mV)
600
V
CC
= 1.8V
400
V
CC
= 3V
400
400
200
V
CC
= 5V
200
T
A
= -40°C
200
V
CC
= 5V
0
0
2
4
6
8
10
0
0
2
4
6
8
10
0
0
2
4
6
8
10
SINK CURRENT (mA)
SINK CURRENT (mA)
SOURCE CURRENT (mA)
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MAX9025-28 toc09
800
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
800
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
MAX9025/MAX9027
OUTPUT VOLTAGE HIGH vs. SOURCE CURRENT
800
MAX9025-28 toc06
800
MAX9027/MAX9028
SUPPLY CURRENT vs. TEMPERATURE
40
MAX9025/MAX9026
SUPPLY CURRENT vs. OUTPUT
TRANSITION FREQUENCY
40
MAX9027/MAX9028
SUPPLY CURRENT vs. OUTPUT
TRANSITION FREQUENCY
MAX9025-28 toc03
1200
MAX9027/MAX9028
SUPPLY CURRENT vs. SUPPLY VOLTAGE
800
1200
MAX9025/MAX9026
SUPPLY CURRENT vs. TEMPERATURE
PCB Design
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