19-1512; Rev 2; 10/10
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
General Description
The MAX917–MAX920 nanopower comparators in
space-saving SOT23 packages feature Beyond-the-
Rails™ inputs and are guaranteed to operate down to
+1.8V. The MAX917/MAX918 feature an on-board
1.245V ±1.5% reference and draw an ultra-low supply
current of only 750nA, while the MAX919/MAX920 (with-
out reference) require just 380nA of supply current.
These features make the MAX917–MAX920 family of
comparators ideal for all 2-cell battery applications,
including monitoring/management.
The unique design of the output stage limits supply-cur-
rent surges while switching, virtually eliminating the
supply glitches typical of many other comparators. This
design also minimizes overall power consumption
under dynamic conditions. The MAX917/MAX919 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 8mA. The MAX918/MAX920
have an open-drain output stage that makes them suit-
able for mixed-voltage system design.
Features
♦
Ultra-Low Supply Current
380nA per Comparator (MAX919/MAX920)
750nA per Comparator with Reference
(MAX917/MAX918)
♦
Guaranteed to Operate Down to +1.8V
♦
Internal 1.245V ±1.5% Reference
(MAX917/MAX918)
♦
Input Voltage Range Extends 200mV
Beyond-the-Rails
♦
CMOS Push-Pull Output with ±8mA Drive
Capability (MAX917/MAX919)
♦
Open-Drain Output Versions Available
(MAX918/MAX920)
♦
Crowbar-Current-Free Switching
♦
Internal Hysteresis for Clean Switching
♦
No Phase Reversal for Overdriven Inputs
♦
Space-Saving SOT23 Package
MAX917–MAX920
Ordering Information
PART
PIN-PACKAGE
5 SOT23
8 SO
5 SOT23
8 SO
5 SOT23
5 SOT23
8 SO
5 SOT23
TOP
MARK
ADIQ
—
ADIR
—
ADIS
AFGP
—
ADIT
PKG
CODE
U5+1
S8+2
U5+1
S8+2
U5+1
U5+1
S8+2
U5+1
Applications
2-Cell Battery Monitoring/Management
Ultra-Low-Power Systems
Mobile Communications
Notebooks and PDAs
Threshold Detectors/Discriminators
Sensing at Ground or Supply Line
Telemetry and Remote Systems
Medical Instruments
MAX917EUK+T
MAX917ESA+
MAX918EUK+T
MAX918ESA+
MAX919EUK+T
MAX919EUK/V+T
MAX919ESA+
MAX920EUK+T
Selector Guide
PART
MAX917
MAX918
MAX919
MAX920
INTERNAL
REFERENCE
Yes
Yes
No
No
OUTPUT
TYPE
Push-Pull
Open-Drain
Push-Pull
Open-Drain
SUPPLY
CURRENT
(nA)
750
750
380
380
—
MAX920ESA+
8 SO
S8+2
Note:
All devices are specified over the -40°C to +85°C operating
temperature range.
+Denotes
a lead(Pb)-free/RoHS-compliant package.
/V denotes an automotive qualified part.
Pin Configurations
TOP VIEW
OUT
1
5
V
CC
V
EE
2
MAX917
MAX918
MAX919
MAX920
4
IN- (REF)
Typical Application Circuit appears at end of data sheet.
IN+
3
Beyond-the-Rails is a trademark of Maxim Integrated Products, Inc.
( ) ARE FOR MAX917/MAX918.
SOT23
Pin Configurations continue at end of data sheet.
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
MAX917–MAX920
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)
Current Into Input Pins......................................................±20mA
Output Voltage
MAX917/MAX919 ........................(V
EE
- 0.3V) to (V
CC
+ 0.3V)
MAX918/MAX920 ......................................(V
EE
- 0.3V) to +6V
Output Current..................................................................±50mA
Output Short-Circuit Duration .............................................10sec
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.31mW/°C above +70°C).........571mW
8-Pin SO (derate 5.88mW/°C above +70°C)...............471mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°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—MAX917/MAX918
(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
IN+ Voltage Range
Input Offset Voltage
Input-Referred Hysteresis
Input Bias Current
Power-Supply Rejection Ratio
SYMBOL
V
CC
I
CC
V
IN+
V
OS
V
HB
I
B
PSRR
V
CC
= 1.8V
V
CC
= 5V
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
EE
- 0.2
1
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
95
8
98
10
mA
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 5V
V
CC
= 1.8V
55
190
55
190
1
2
1
400
500
200
300
400
500
200
300
1
µA
mV
mV
T
A
= +25°C
T
A
= T
MIN
to T
MAX
CONDITIONS
Inferred from the PSRR test
MIN
1.8
0.75
0.80
1.30
1.60
V
CC
+ 0.2
5
10
V
mV
mV
nA
mV/V
µA
TYP
MAX
5.5
UNITS
V
Inferred from the 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
MAX917 only, V
CC
=
5V, I
SOURCE
= 8mA
Output-Voltage Swing High
V
CC
- V
OH
MAX917 only, V
CC
=
1.8V, I
SOURCE
= 1mA
V
CC
= 5V,
I
SINK
= 8mA
Output-Voltage Swing Low
V
OL
V
CC
= 1.8V,
I
SINK
= 1mA
Output Leakage Current
I
LEAK
MAX918 only, V
O
= 5.5V
Sourcing, V
O
= V
EE
Output Short-Circuit Current
I
SC
Sinking, V
O
= V
CC
2
_______________________________________________________________________________________
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
ELECTRICAL CHARACTERISTICS—MAX917/MAX918 (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)
SYMBOL
t
PD-
V
CC
= 1.8V
V
CC
= 5V
MAX917 only
Low-to-High Propagation Delay
(Note 4)
t
PD+
MAX918 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
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
ΔV
REF
/
ΔV
CC
ΔV
REF
/
ΔI
OUT
BW = 10Hz to 100kHz
BW = 10Hz to 100kHz, C
REF
= 1nF
1.8V
≤
V
CC
≤
5.5V
ΔI
OUT
= 10nA
T
A
= +25°C
T
A
= T
MIN
to T
MAX
1.227
1.200
95
600
215
0.1
±0.2
MAX917 only, C
L
= 15pF
C
L
= 15pF
CONDITIONS
MIN
TYP
17
22
30
95
35
120
6
4
1.2
1.245
1.263
1.290
µs
µs
ms
V
ppm/°C
µV
RMS
mV/V
mV/nA
µs
MAX
UNITS
µs
MAX917–MAX920
ELECTRICAL CHARACTERISTICS—MAX919/MAX920
(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
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
1
4
0.15
1
2
CONDITIONS
Inferred from the PSRR test
MIN
1.8
0.38
0.45
0.80
1.2
V
CC
+ 0.2
5
10
V
mV
mV
nA
µA
TYP
MAX
5.5
UNITS
V
V
CM
V
OS
V
HB
I
B
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
T
A
= +25°C
T
A
= T
MIN
to T
MAX
-0.2V
≤
V
CM
≤
(V
CC
+ 0.2V) (Note 3)
_______________________________________________________________________________________
3
MAX917–MAX920
SOT23, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
ELECTRICAL CHARACTERISTICS—MAX919/MAX920 (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
Input Offset Current
Power-Supply Rejection Ratio
Common-Mode Rejection Ratio
SYMBOL
I
OS
PSRR
CMRR
V
CC
= 1.8V to 5.5V
(V
EE
- 0.2V)
≤
V
CM
≤
(V
CC
+ 0.2V)
MAX919 only, V
CC
=
5V, I
SOURCE
= 8mA
MAX919 only, V
CC
=
1.8V, I
SOURCE
= 1mA
V
CC
= 5V,
I
SINK
= 8mA
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
95
8
98
10
17
22
30
95
35
120
6
4
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
MAX919 only
Low-to-High Propagation Delay
(Note 4)
t
PD+
MAX920 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
MAX919 only, C
L
= 15pF
C
L
= 15pF
55
190
55
CONDITIONS
MIN
TYP
10
0.1
0.5
190
1
3
400
500
200
300
400
500
200
300
1
µA
mV
mV
MAX
UNITS
pA
mV/V
mV/V
Output-Voltage Swing High
V
CC
- V
OH
Output-Voltage Swing Low
V
OL
Output Leakage Current
I
LEAK
MAX920 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-
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 MAX917/MAX918, reference voltage
error should also be added.
4
_______________________________________________________________________________________
SOT23, 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.)
MAX917/MAX918
SUPPLY CURRENT vs.
SUPPLY VOLTAGE AND TEMPERATURE
T
A
= +85°C
SUPPLY CURRENT (nA)
800
T
A
= +25°C
700
MAX917-920 toc01
MAX917–MAX920
MAX919/MAX920
SUPPLY CURRENT vs.
SUPPLY VOLTAGE AND TEMPERATURE
MAX917-920 toc02
MAX917/MAX918
SUPPLY CURRENT vs. TEMPERATURE
850
SUPPLY CURRENT (nA)
800
750
700
650
600
550
V
CC
= 3V
V
CC
= 1.8V
V
CC
= 5V
MAX917-920 toc03
900
600
900
SUPPLY CURRENT (nA)
T
A
= +85°C
500
T
A
= +25°C
400
T
A
= -40°C
600
T
A
= -40°C
500
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
300
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
SUPPLY VOLTAGE (V)
500
-40
-15
10
35
60
85
TEMPERATURE (°C)
MAX919/MAX920
SUPPLY CURRENT vs. TEMPERATURE
MAX917-920 toc04
MAX917/MAX918
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
MAX917-920 toc05
MAX919/MAX920
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
V
CC
= 5V
MAX917-920 toc06
550
16
14
SUPPLY CURRENT (μA)
12
10
8
6
4
2
V
CC
= 1.8V
0
V
CC
= 3V
V
CC
= 5V
14
12
SUPPLY CURRENT (μA)
10
8
6
4
2
0
1
10
100
1k
V
CC
= 1.8V
10k
V
CC
= 3V
500
SUPPLY CURRENT (nA)
V
CC
= 5V
450
V
CC
= 3V
400
V
CC
= 1.8V
350
300
-40
-15
10
35
60
85
TEMPERATURE (°C)
1
10
100
1k
10k
100k
100k
OUTPUT TRANSITION FREQUENCY (Hz)
OUTPUT TRANSITION FREQUENCY (Hz)
OUTPUT-VOLTAGE LOW vs. SINK CURRENT
MAX917-920 toc07
OUTPUT-VOLTAGE LOW vs. SINK CURRENT
AND TEMPERATURE
MAX917-920 toc08
MAX917/MAX919
OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT
V
CC
= 1.8V
V
CC
= 5V
MAX917-920 toc09
450
400
350
300
V
OL
(mV)
250
200
150
100
50
0
0
2
4
6
8
10
12
14
V
CC
= 5V
V
CC
= 1.8V
V
CC
= 3V
600
500
400
V
OL
(mV)
300
200
T
A
= -40°C
100
0
T
A
= +85°C
T
A
= +25°C
0.6
0.5
V
CC
= 3V
V
CC
- V
OH
(V)
0.4
0.3
0.2
0.1
0
16
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10 12 14 16 18 20
SINK CURRENT (mA)
SINK CURRENT (mA)
SOURCE CURRENT (mA)
_______________________________________________________________________________________
5
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