General Description
The MAX9038–MAX9043 and MAX9050–MAX9053 feature
combinations of low-power comparators and precision
voltage references. Their operating voltage range makes
them ideal for both 3V and 5V systems. The MAX9039/
MAX9040/MAX9041/MAX9050/MAX9051 have a single
comparator and reference consuming only 40μA of supply
current. The MAX9042/MAX9043/MAX9052/MAX9053
have dual comparators and one reference, and consume
only 55μA of supply current. Low-voltage operation and
low supply current make these devices ideal for battery-
operated systems.
The comparators feature rail-to-rail inputs and outputs,
with a common-mode input voltage range that extends
250mV beyond the supply rails. Input bias current is
typically 1.0pA, and input offset voltage is typically 0.5mV.
Internal hysteresis ensures clean output switching, even
with slow-moving input signals. The output stage features
a unique design that limits supply current surges while
switching, virtually eliminating supply glitches typical of
many other comparators. This design also minimizes
overall power consumption under dynamic conditions.
The comparator outputs have railto-rail, push-pull output
stages except the MAX9038 has an open-drain output
that sinks and sources up to 8mA. The propagation delay
is 400ns, even with the low-operating supply current.
The reference output voltage is set to 1.23V in the MAX9038/
MAX9039, to 2.048V in the MAX9040–MAX9043, and
to 2.500V in the MAX9050–MAX9053. The MAX9040–
MAX9043 and the MAX9050–MAX9053 are offered in two
grades: an A grade with 0.4% initial accuracy and 6ppm/°C
tempco, and a B grade with 1% initial accuracy (except
MAX9038/MAX9039 have an initial accuracy of ±0.4%)
and 100ppm/°C tempco. The voltage references feature a
proprietary curvature-correction circuit and laser-trimmed
thin-film resistors. These series-mode references can sink
or source up to 500μA of load current.
Applications
●Precision Battery
Management
●Window Comparators
●IR Receivers
● Level Translators
● Digital Line Receivers
Features
●Comparator + Precision Reference in UCSP/SOT23
●2.5V to 5.5V Single-Supply Operation
(MAX9038–MAX9043)
● Low Supply Current (MAX9038/MAX9039/MAX9040/
MAX9041/MAX9050/MAX9051)
• 40μA Quiescent
• 50μA with 100kHz Switching
• Open-Drain Output MAX9038
●400ns Propagation Delay
●Rail-to-Rail Inputs
●Rail-to-Rail Output Stage Sinks and Sources 8mA
● Internal ±3mV Hysteresis
●Voltage Reference Offers
• ±0.4% (max) Initial Accuracy (A Grade)
• 6ppm/°C (typ) Temperature Coefficient (A Grade)
• Stable for 0 to 4.7nF Capacitive Loads
Typical Operating Circuit and Functional Diagrams appear at end
of data sheet.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
19-1569; Rev 10; 1/17
+Denotes lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX9038BABT+T -40°C to +125°C 6 UCSP ADW
MAX9039BEBT+T -40°C to +85°C 6 UCSP AAZ
MAX9040AEUK+T -40°C to +85°C 5 SOT23 ADNW
MAX9040BEUK+T -40°C to +85°C 5 SOT23 ADNX
MAX9041AEUT+T -40°C to +85°C 6 SOT23 AAHF
MAX9041BEUT+T -40°C to +85°C 6 SOT23 AAHH
MAX9041AESA -40°C to +85°C 8 SO —
MAX9041BESA -40°C to +85°C 8 SO —
TOP VIEW (BUMPS ON BOTTOM) TOP VIEW
VEE
REFIN+
1
+
5 VCC
OUT
MAX9040
MAX9050
SOT23
2
3 4
IN-
VCC
REF
VEE
IN+
MAX9038
MAX9039
B3
OUT
B1
A3
A2
A1
B2
UCSP
Pin Configurations continued at end of data sheet.
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
Pin Congurations
Ordering Information
Supply Voltage (VCC to VEE) ..................................-0.3V to +6V
OUT (MAX9038) ...................................................... -0.3V to +6V
All Other Pins ................................(VEE - 0.3V) to (VCC + 0.3V)
Current into Input Pins .....................................................±20mA
Output Short-Circuit Duration
(OUT_, REF) .............Indefinite Short Circuit to Either Supply
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 7.10mW/°C above +70°C) ........571mW
6-Bump UCSP (derate 3.9mW/°C above +70°C) ........308mW
6-Pin SOT23 (derate 8.70mW/°C above +70°C) ........696mW
8-Pin SO (derate 5.88mW/°C above +70°C) ............... 471mW
8-Pin μMAX® (derate 4.1mW/°C above +70°C) ..........330mW
10-Pin μMAX (derate 5.6mW/°C above +70°C) ..........444mW
Operating Temperature Range ........................... -40°C to +85°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Reflow Temperature (Note 1) ................................+235°C
(VCC = +5V, VEE = 0V, VCM = 0V, IOUT = 0A, IREF = 0A, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
μMAX is a registered trademark of Maxim Integrated Products, Inc.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range (Note 3) VCC
MAX9040–MAX9043 2.5 5.5 V
MAX9050–MAX9053 2.7 5.5
Supply Current ICC
MAX9040/MAX9041/
MAX9050/MAX9051
VCC = 2.7V 47 67
µA
VCC = 5V 52 72
MAX9042/MAX9043/
MAX9052/MAX9053
VCC = 2.7V 55 80
VCC = 5V 60 85
COMPARATORS
Input Offset Voltage (Note 4) VOS
Over entire
common-mode
range
TA = +25°C ±0.5 ±5.0
mV
TA = -40°C to +85°C ±7.0
Input Hysteresis VHYST ±3.0 mV
Input Bias Current
(Notes 5, 6, 7) IBSpecied common-mode range ±0.001 ±10.0 nA
Input Offset Current (Note 5) IOS Specied common-mode range ±0.5 pA
Common-Mode Voltage Range
(Notes 5, 8) CMVR TA = +25°C VEE -
0.25
VCC +
0.25 V
TA = -40°C to +85°C VEE VCC
Common-Mode Rejection Ratio
(Note 5) CMRR Specied common-mode range 52 80 dB
Power-Supply Rejection Ratio PSRR MAX9040–MAX9043, 2.5V ≤ VCC ≤ 5.5V 55 80 dB
MAX9050-MAX9053, 2.5V ≤ VCC ≤ 5.5V 55 80
Input Capacitance (Note 5) CIN 2.5 pF
Output Short-Circuit Current ISC VOUT = VEE or VCC
VCC = 5V 95 mA
VCC = 2.7V 35
Output Voltage Low VOL VCC = 5V, ISINK = 8mA 0.2 0.55 V
VCC = 2.7V, ISINK = 3.5mA 0.15 0.4
MAX9038–MAX9043/
MAX9050–MAX9053
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Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can
be exposed to during board-level solder attach and rework. This limit permits only the use of the solder profiles recommended
in the industry-standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and Convection Packaging Reflow.
Preheating is required. Hand or wave soldering is not allowed.
Absolute Maximum Ratings
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—A Grade (0.4% Initial Accuracy)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 2)
(VCC = +5V, VEE = 0V, VCM = 0V, IOUT = 0A, IREF = 0A, TA = TMIN to TMAX, unless otherwise noted. Typical values are at
TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Output Voltage High VOH VCC = 5V, ISOURCE = 8mA 4.45 4.85 V
VCC = 2.7V, ISOURCE = 3.5mA 2.3 2.55
Output Rise/Fall Times tR/tF
CL = 15pF 40
nsCL = 50pF 50
CL = 200pF 80
Output Propagation Delay
(Note 9)
tPD+/
tPD-
CL = 15pF,
VCC = 2.7V
50mV overdrive 450 ns
100mV overdrive 400
Power-Up Time tPU Time to VOUT valid logic state 20 µs
VOLTAGE REFERENCE
Output Voltage VREF TA = +25°C MAX9040–MAX9043 2.040 2.048 2.056 V
MAX9050–MAX9053 2.490 2.500 2.510
Output Voltage Temperature
Coefcient (Note 10) TCVREF
µMAX/SO 6 30 ppm/°C
SOT23 6 50
Line Regulation ΔVREF/
ΔVCC
2.5V ≤ VCC ≤ 5.5V, MAX9040–MAX9043 +50 +200 µV/V
2.7V ≤ VCC ≤ 5.5V, MAX9050–MAX9053 +50 +200
Load Regulation ΔVREF/
ΔIREF
Sourcing. 0µA ≤ IREF ≤ 500µA 2 4 µV/µA
Sinking, -500µA ≤ IREF ≤ 0µA 3.5 6
Output Short-Circuit Current ISC VREF = VEE or VCC 4 mA
Thermal Hysteresis (Note 11) THYST 130 ppm
Long-Term Stability 1000h at TA = +25°C 50 ppm
Noise Voltage EOUT
f = 0.1Hz to 10Hz 40 µVP-P
f = 10Hz to 10kHz 105 µVRMS
Ripple Rejection ΔVREF/
ΔVCC
VCC = 5V ±100mV, f = 120Hz 84 dB
Turn-On Settling Time tR(VREF)To VREF = 1% of nal value 200 µs
Capacitive-Load Stability Range
(Note 7) CL(VREF) 0 4.7 nF
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage Range (Note 3) VCC
MAX9038–MAX9043 2.5 5.5 V
MAX9050–MAX5053 2.7 5.5
Supply Current ICC
MAX9038/MAX9039/
MAX9040/MAX9041/
MAX9050/MAX9051
VCC = 2.7V 40
µA
VCC = 5.0V 45 100
MAX9042/MAX9043/
MAX9052/MAX5053
VCC = 2.7V 55
VCC = 5.0V 60 130
MAX9038–MAX9043/
MAX9050–MAX9053
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Electrical Characteristics—B Grade (1% Initial Accuracy) (Note 12)
Electrical Characteristics —A Grade (0.4% Initial Accuracy) (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
COMPARATOR
Input Offset Voltage (Note 4) VOS Over entire common-mode range ±1 ±9.0 mV
Input Hysteresis VHYST ±3.0 mV
Input Bias Current (Notes 5, 6, 7) IBSpecied common-mode range ±0.001 ±25.0 nA
Input Offset Current (Note 5) IOS Specied common-mode range ±0.5 pA
Common-Mode Voltage Range
(Notes 5, 8) CMVR VEE VCC V
Common-Mode Rejection Ratio
(Note 5) CMRR Specied common-mode range 52 80 dB
Power-Supply Rejection Ratio PSRR MAX9038–MAX9043, 2.5V ≤ VCC ≤ 5.5V 55 80 dB
MAX9050–MAX9053, 2.7V ≤ VCC ≤ 5.5V 55 80
Input Capacitance (Note 5) CIN 2.5 pF
Output Short-Circuit Current ISC VOUT = VEE or VCC
VCC = 5V 95 mA
VCC = 2.7V 35
Output Voltage Low VOL VCC = 5V, ISINK = 8mA 0.2 0.55 V
VCC = 2.7V, ISINK = 3.5mA 0.15
Output Voltage High (Except
MAX9038) VOH VCC = 5V, ISOURCE = 8mA 4.45 4.85 V
VCC = 2.7V, ISOURCE = 3.5mA 2.55
Output Leakage MAX9038 0.5 µA
Output Rise/Fall Times tR/tF
CL = 15pF 40
nsCL = 50pF 50
CL = 200pF 80
Output Rise Time tR
RPU = 10kΩ, CL = 15pF, MAX9038 400
nsRPU = 10kΩ, CL = 50pF, MAX9038 1180
RPU = 10kΩ, CL = 200pF, MAX9038 5580
Output Propagation Delay
(Note 9) tPD+/tPD-
CL = 15pF,
VCC = 2.7V
50mV overdrive 450 ns
100mV overdrive 400
Output Rising Propagation Delay
(Note 9) tPD+
RPU = 10kΩ, CL = 15pF, MAX9038 500
nsRPU = 10kΩ, CL = 50pF, MAX9038 1540
RPU = 10kΩ, CL = 200pF, MAX9038 3350
Power-Up Time tPU Time to VOUT valid logic state 20 µs
VOLTAGE REFERENCE
Output Voltage VREF TA = +25°C
MAX9038/MAX9039 (Note 12) 1.225 1.230 1.235
VMAX9040–MAX9043 2.028 2.048 2.068
MAX9050–MAX9053 2.475 2.500 2.525
Output Voltage Temperature
Coefcient (Note 10) TCVREF 20 100 ppm/°C
MAX9038–MAX9043/
MAX9050–MAX9053
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Electrical Characteristics—B Grade (1% Initial Accuracy) (Note 12) (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = TMIN to TMAX, unless otherwise noted. Typical
values are at TA = +25°C.) (Note 2)
Note 2: All devices are 100% production tested at TA = +25°C. Limits over the extended temperature range are guaranteed by
design.
Note 3: Supply voltage range guaranteed by PSRR test on comparator and line regulation of REF.
Note 4: VOS is defined as the center of the input-referred hysteresis band.
Note 5: For the comparators with the inverting input (IN-) uncommitted.
Note 6: Input bias current is the average of the inverting and noninverting input bias currents.
Note 7: Not production tested. Guaranteed by design.
Note 8: Guaranteed by CMRR test.
Note 9: VOVERDRIVE is beyond the offset and hysteresis determined trip point.
Note 10: Temperature coefficient is measured by the box method; i.e., the maximum ΔVREF is divided by the maximum ΔT.
Note 11: Thermal hysteresis is defined as the change in VREF at +25°C before and after cycling the device from TMIN to TMAX.
Note 12: MAX9038/MAX9039 has an initial accuracy of ±0.4%.
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Line Regulation ΔVREF/
ΔVCC 2.5V ≤ VCC ≤ 5.5V MAX9038–MAX9043 +50 +200 µV/V
MAX9050–MAX9053 +50 +200
Load Regulation ΔVREF/
ΔIREF
Sourcing: 0µA ≤ IREF ≤ 500µA 2 4 µV/µA
Sinking: -500µA ≤ IREF ≤ 0µA 3.5 6
Output Short-Circuit Current ISC VREF = VEE or VCC 4 mA
Thermal Hysteresis (Note 11) THYST 130 ppm
Long-Term Stability 1000h at TA = +25°C 100 ppm
Ripple Rejection ΔVREF/
ΔVCC
VCC = 5V ±100mV, f = 120Hz 84 dB
Turn-On Settling Time tR(VREF)To VREF = 1% of nal value 200 µs
Capacitive Load Stability Range
(Note 7) CL(VREF) 0 4.7 nF
0
10
30
20
50
40
60
-40 0-20 20 40 60 80
MAX9042/MAX9043/MAX9052/MAX9053
SUPPLY CURRENT vs. TEMPERATURE
MAX9038 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VCC = 5.0V
VIN+ > VIN-
VCC = 2.7V
0.01 0.1 1 10 100 1000
200
150
100
50
0
MAX9039/MAX9040/MAX9041/MAX9050/MAX9051
SUPPLY CURRENT vs. SWITCHING FREQUENCY
MAX9038 toc03
SWITCHING FREQUENCY (kHz)
SUPPLY CURRENT (µA)
VCC = 5.0V
VCC = 2.7V
0
10
30
20
50
40
60
-40 0-20 20 40 60 80
MAX9039/MAX9040/MAX9041/MAX9050/MAX9051
SUPPLY CURRENT vs. TEMPERATURE
MAX9038 toc01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VCC = 5.0V
VIN+ > VIN-
VCC = 2.7V
MAX9038–MAX9043/
MAX9050–MAX9053
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Electrical Characteristics—B Grade (1% Initial Accuracy) (Note 12) (continued)
Typical Operating Characteristics
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = +25°C, unless otherwise noted.)
MAX9038
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
MAX9038 toc03a
FREQUENCY (Hz)
SUPPLY CURRENT (µA)
10k100
10
20
30
40
50
60
70
80
0
1 1M
VCC = 2.7V
VCC = 5V
250
0.01 0.1 1 10 100 1000
200
150
100
50
0
MAX9042/MAX9043/MAX9052/MAX9053
SUPPLY CURRENT vs. SWITCHING FREQUENCY
MAX9038 toc04
SWITCHING FREQUENCY (kHz)
SUPPLY CURRENT (µA)
VCC = 5.0V
VCC = 2.7V
10,000
1000
100
10
1
0.1
0.01 1 100.1
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX9038 toc05
OUTPUT SINK CURRENT (mA)
V
OL
(mV)
VCC = 5.0V
VIN+ < VIN-
VCC = 2.7V
MAX9038
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX9038 toc05a
OUTPUT SINK CURRENT (mA)
SUPPLY CURRENT (µA)
15
510
50
100
150
200
250
300
0
020
10,000
1000
100
10
1
0.1
0.01 1 100.1
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX9038 toc06
OUTPUT SOURCE CURRENT (mA)
OUTPUT HIGH VOLTAGE (VCC - VOH) (mV)
VCC = 5.0V
VIN+ > VIN-
VCC = 2.7V
0
40
20
60
100
80
120
-40 0-20 20 40 60 80
OUTPUT SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
MAX9038 toc07
TEMPERATURE (°C)
OUTPUT SOURCE CURRENT (mA)
VCC = 5.0V
VIN+ > VIN-
OUT SHORTED TO VEE
VCC = 2.7V
0
20
60
40
80
100
-40 -20 0 20 40 60 80
OUTPUT SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
MAX9038 toc08
TEMPERATURE (°C)
OUTPUT SINK CURRENT (mA)
VCC = 5.0V
VIN- > VIN+
OUT SHORTED TO VCC
VCC = 2.7V
MAX9038–MAX9043/
MAX9050–MAX9053
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Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = +25°C, unless otherwise noted.)
MAX9038
OUTPUT SHORT-CIRCUIT CURRENT
vs. TEMPERATURE
MAX9038 toc08a
TEMPERATURE (°C)
SHORT-CIRCUIT TEMPERATURE (mA)
100
50
40
20
60
80
140
120
100
160
0
0150
VCC = 2.7V
VCC = 5V
350
400
450
500
550
600
0 400200 600 800100 500300 700 900 1000
PROPAGATION DELAY
vs. CAPACITIVE LOAD (VCC = 2.7V)
MAX9038 toc09
CAPACITIVE LOAD (pF)
t
PD
(ns)
tPD+ TO VOUT = 10%
OF FINAL VALUE
VOD = 50mV
tPD- TO VOUT = 50%
OF FINAL VALUE
tPD- TO VOUT = 10%
OF FINAL VALUE
tPD+ TO VOUT = 50%
OF FINAL VALUE
300
400
350
500
450
600
550
650
0 400200 600 800100 500300 700 900 1000
PROPAGATION DELAY
vs. CAPACITIVE LOAD (VCC = 5V)
MAX9038 toc10
CAPACITIVE LOAD (pF)
t
PD
(ns)
tPD+ TO VOUT = 50%
OF FINAL VALUE
tPD- TO VOUT = 50%
OF FINAL VALUE
tPD+ TO VOUT = 10%
OF FINAL VALUE
tPD- TO VOUT = 10%
OF FINAL VALUE
VOD = 50mV
350
300
450
400
600
550
500
650
-40 0-20 20 40 60 80
PROPAGATION DELAY
vs. TEMPERATURE
MAX9038 toc10a
TEMPERATURE (°C)
tPD (ns)
tPD+ TO VOUT = 50%
OF FINAL VALUE
tPD- TO VOUT = 50%
OF FINAL VALUE
tPD+ TO VOUT = 10%
OF FINAL VALUE
tPD- TO VOUT = 10%
OF FINAL VALUE
VOD = 50mV
200
400
300
600
500
800
700
900
0 8040 120 16020 10060 140 180 200
PROPAGATION DELAY
vs. INPUT OVERDRIVE
MAX9038 toc10b
INPUT OVERDRIVE (mV)
tPD (ns)
tPD+, VCC = 5.0V
tPD-, VCC = 2.7V
tPD-, VCC = 5.0V
tPD+, VCC = 2.7V
B
A
100ns/div
PROPAGATION DELAY (tPD+)
MAX9038 toc11
A = IN+, 50mV/div
B = OUT, 2V/div
B
A
100ns/div
PROPAGATION DELAY (tPD-)
MAX9038 toc12
A = IN+, 50mV/div
B = OUT, 2V/div
MAX9038–MAX9043/
MAX9050–MAX9053
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Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = +25°C, unless otherwise noted.)
B
C
A
100ns/div
SWITCHING CURRENT (OUT RISING EDGE)
MAX9038 toc13
A = IN+, 100mV/div
B = OUT, 5V/div
C = ICC, 1mA/div
B
C
A
100ns/div
MAX9038 toc14
A = IN+, 100mV/div
B = OUT, 5V/div
C = ICC, 1mA/div
B
A
5ms/div
POWER-UP DELAY (OUT)
MAX9038 toc15
A = VCC, 2V/div
B = OUT, 1V/div
B
C
A
100µs/div
POWER-UP DELAY (REF)
MAX9038 toc16
A = VCC, 2V/div
B = REF, 1V/div
C = REF, 50mV/div, 2.048V OFFSET
0
0.001
0.002
0.003
0 2.01.50.5 1.0 2.5 3.0 3.5 4.0 4.5 5.0
INPUT BIAS CURRENT
vs. INPUT VOLTAGE
MAX9038 tco17
VIN+ (V)
INPUT BIAS CURRENT (nA)
VIN- = 2.0V
IB+
IB-
-1.00
-0.50
-0.75
0
-0.25
0.75
0.50
0.25
1.00
-40 0-20 20 40 60 80
MAX904_/MAX905_
REFERENCE OUTPUT VOLTAGE
TEMPERATURE DRIFT
MAX9038 toc18
TEMPERATURE (°C)
OUTPUT VOLTAGE CHANGE (mV)
THREE TYPICAL PARTS
NORMALIZED TO +25∞C
MAX9039
REFERENCE OUTPUT VOLTAGE
TEMPERATURE DRIFT
MAX9038 toc19
TEMPERATURE (°C)
OUTPUT VOLTAGE CHANGE (mV)
8060
40
20
0-20
-2
-1
0
1
-3
-40
THREE TYPICAL PARTS
NORMALIZED TO +25°C
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
Maxim Integrated
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Typical Operating Characteristics (continued)
(VCC = 5V, VEE = 0V, VCM = 0V, VPU = 1.8V, RPU = 10kΩ, IOUT = 0A, IREF = 0A, TA = +25°C, unless otherwise noted.)
PIN
NAME FUNCTION
MAX9038
MAX9039
MAX9040
MAX9050
MAX9041
MAX9051
MAX9042
MAX9052
MAX9043
MAX9053
UCSP SOT23 SOT23 SO SO/μMAX μMAX
A2 1 1 6 — — OUT Comparator Output
A1 2 2 4 4 5 VEE Negative Supply Voltage
B1 3 3 3 — — IN+ Comparator Noninverting Input
B3 4 5 1 2 2 REF Reference Voltage Output
A3 5 6 7 8 10 VCC Positive Supply Voltage
B2 — 4 2 — — IN- Comparator Inverting Input
— — — 5, 8 — 9 N.C. No Connection. Not internally connected.
— — — — 1 1 OUTA Comparator A Output
— — — — 3 4 INA+ Comparator A Noninverting Input
— — — — 5 6 INB+ Comparator B Noninverting Input
— — — — 6 7 INB- Comparator B Inverting Input
— — — — 7 8 OUTB Comparator B Output
— — — — — 3 INA- Comparator A Inverting Input
-200
-100
-150
0
-50
100
50
150
2.5 3.5 4.03.0 4.5 5.0 5.5
LINE REGULATION
MAX9038 toc20
INPUT VOLTAGE (V)
REFERENCE OUTPUT VOLTAGE CHANGE (mV)
TA = +25°C
TA = +85°C
TA = -40°C
-1500
-500
-1000
500
0
1500
1000
2000
-500 -100-300 100 300 500
LOAD REGULATION
MAX9038 toc21
LOAD CURRENT (mA)
REFERENCE OUTPUT VOLTAGE CHANGE (mV)
TA = +25°C
TA = +85°C
TA = -40°C
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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Typical Operating Characteristics (continued)
Pin Description
Detailed Description
The MAX9038–MAX9043 and MAX9050–MAX9053
feature single/dual, low-power, low-voltage compara-
tors and a precision voltage reference. They operate
from a single 2.5V to 5.5V (MAX903_/MAX904_) or
2.7V to 5.5V (MAX905_) supply. The single compa
rators with reference, (MAX9038/MAX9039/MAX9040/
MAX9041/MAX9050/MAX9051 consume only 40μA of
supply current, while the dual comparators with reference
(MAX9042/MAX9043/MAX9052/MAX9053) consume
only 55μA of supply current. Their common-mode input
range extends 0.25V beyond each rail. Internal hysteresis
ensures clean output switching, even with slow-moving
input signals.
The output stage employs a unique design that minimizes
supply current surges while switching, virtually eliminating
the supply glitches typical of many other comparators.
Large internal output drivers allow rail-to-rail output swing
that can sink and source up to 8mA of current.
The precision reference uses a proprietary curvaturecorrec-
tion circuit and laser-trimmed thin-film resistors, resulting in
a temperature coefficient of less than 30ppm/°C over the
extended temperature range and initial accuracy of 0.4% (A
grade). The reference output voltage is set to 1.23V in the
MAX9038/MAX9039, 2.048V in the MAX9040–MAX9043,
and to 2.500V in the MAX9050–MAX9053.
Comparator Input Stage Circuitry
The devices’ input common-mode range extends from
(VEE - 0.25V) to (VCC + 0.25V). These comparators may
operate at any differential input voltage within these limits.
Input bias current is typically 1.0pA if the input voltage is
between the supply rails. Comparator inputs are protected
from overvoltage by internal body diodes connected to the
supply rails. As the input voltage exceeds the supply rails,
these body diodes become forward biased and begin to
conduct. Consequently, bias currents increase exponen-
tially as the input voltage exceeds the supply rails.
Comparator Output Stage Circuitry
The comparators in these devices contain a unique out-
put stage capable of rail-to-rail operation with loads up to
8mA. Many comparators consume orders-of-magnitude
more current during switching than during steady-state
operation. However, with this family of comparators,
the supply current change during an output transition is
extremely small. The Typical Operating Characteristics
graph Supply Current vs. Switching Frequency shows
the minimal supply current increase as the output switch-
ing frequency approaches 1MHz. This characteristic
reduces the need for power-supply filter capacitors to
reduce glitches created by comparator switching cur-
rents. Another advantage realized in high-speed, battery-
powered applications is a substantial increase in battery
life. The MAX9038 is an opendrain output comparator
that can be used in logic-level translation or many other
applications where voltage level translation is important.
Applications Information
Additional Hysteresis
These comparators have ±3mV internal hysteresis.
Additional hysteresis can be generated with two resistors
using positive feedback (Figure 1). Use the following pro-
cedure to calculate resistor values:
1) Calculate the trip points of the comparator using
these formulas:
( )
CC REF
TH REF
V V R2
VV R1 R2

−
= +


+

TL REF
R2
VV 1
R1 R2

= −

+

VTH is the threshold voltage at which the comparator
switches its output from high to low as VIN rises
above the trip point. VTL is the threshold voltage at
which the comparator switches its output from low to
high as VIN drops below the trip point.
2) The hysteresis band will be:
3) In this example, let VCC = 5V and VREF = 2.5V:
HYS TH TL CC
R2
V VVV
R1 R2

=−=
+

Figure 1. Additional Hysteresis
MAX9038–MAX9043
MAX9050–MAX9053
OUT
IN+
IN-
R2
R1
VIN
VREF
VCC
VEE
VCC
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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TH
R2
V 2.5 2.5 R1 R2

= + 
+

and
TL
R2
V 2.5 1 R1 R2

= −

+

4) Select R2. In this example, we will choose 1kΩ.
5) Select VHYS. In this example, we will choose 50mV.
6) Solve for R1:
HYS CC
R2
VV
R1 R2

=
+

1000
0.050 5 R1 1000

=
+

where R1 ≈ 100kΩ, VTH = 2.525V, and VTL = 2.475V.
Board Layout and Bypassing
Power-supply bypass capacitors are not typically needed,
but would be called for in cases where supply imped-
ance is high, supply leads are long, or excessive noise is
expected on the supply lines. Use 100nF bypass capaci-
tors under these conditions. Minimize signal trace lengths
to reduce stray capacitance.
Reference Output/Load Capacitance
The MAX9038/MAX9039/MAX904_/MAX905_ do not
require an output capacitor on REF for frequency stability.
They are stable for capacitive loads up to 4.7nF. However,
in applications where the load or the supply can experience
step changes, an output capacitor will reduce the amount
of overshoot (or undershoot) and assist the circuit’s tran-
sient response. When an application is not subject to tran-
sient conditions, the REF capacitor can be omitted.
Biasing for Data Recovery
Digital data is often embedded into a bandwidth- and
amplitude-limited analog path. Recovering the data can
be difficult. Figure 2 compares the input signal to a time-
averaged version of itself. This self-biases the threshold
to the average input voltage for optimal noise margin.
Even severe phase distortion is eliminated from the digital
output signal. Be sure to choose R1 and C1 so that:
CAR
1
f2 R1C1
>> π
where fCAR is the fundamental carrier frequency of the
digital data stream.
Figure 2. Time Averaging of the Input Signal for Data Recovery
MAX9038–MAX9043
MAX9050–MAX9053
OUT
IN+
IN-
10kΩ
0.1µF
VCC
VIN
VEE
VCC
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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PART COMPARATORS
PER PACKAGE
VREF
(V) IN- CONNECTIONS
MAX9038 1 1.230 Uncommitted
MAX9039 1 1.230 Uncommitted
MAX9040 1 2.048 REF
MAX9041 1 2.048 Uncommitted
MAX9050 1 2.500 REF
MAX9051 1 2.500 Uncommitted
MAX9042 2 2.048 REF/Uncommitted
MAX9043 2 2.048 Uncommitted/Uncommitted
MAX9052 2 2.500 REF/Uncommitted
MAX9053 2 2.500 Uncommitted/Uncommitted
MAX9040
MAX9050
OUT
1
5
3
6 (A2)
7 (A3)
3 (B1)
IN+ REF
VEE 2
VCC REF
MAX9038
MAX9039
MAX9041
MAX9051
OUT
IN+
( ) MAX9038/MAX9039 UCSP BUMPS.
IN-
REF
VEE 4 (A1)
8
7
6
5
10
8
7
6
1 (B3)
2 (B2)
VCC
REF
MAX9042
MAX9052
OUTA
1
2
3
4
1
2
3
4
5
OUTB
INA+ INB-
INB+
REF
VEE
VCC
REF
MAX9043
MAX9053
OUTA
OUTB
INA+
INA-
INB-
INB+
REF
VEE
VCC
REF
4
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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Functional Diagrams
Selector Guide
+Denotes lead(Pb)-free/RoHS-compliant package.
PART TEMP RANGE PIN-
PACKAGE
TOP
MARK
MAX9042AEUA -40°C to +85°C 8 µMAX —
MAX9042BEUA -40°C to +85°C 8 µMAX —
MAX9042AESA -40°C to +85°C 8 SO —
MAX9042BESA -40°C to +85°C 8 SO —
MAX9043AEUB -40°C to +85°C 10 µMAX —
MAX9043BEUB -40°C to +85°C 10 µMAX —
MAX9050AEUK+T -40°C to +85°C 5 SOT23 ADNW
MAX9050BEUK+T -40°C to +85°C 5 SOT23 ADNY
MAX9051AEUT+T -40°C to +85°C 6 SOT23 AAHG
MAX9051BEUT+T -40°C to +85°C 6 SOT23 AAHI
MAX9051AESA -40°C to +85°C 8 SO —
MAX9051BESA -40°C to +85°C 8 SO —
MAX9052AEUA -40°C to +85°C 8 µMAX AAHG
MAX9052BEUA -40°C to +85°C 8 µMAX AAHI
MAX9052AESA -40°C to +85°C 8 SO —
MAX9052BESA -40°C to +85°C 8 SO —
MAX9053AEUB -40°C to +85°C 10 µMAX —
MAX9053BEUB -40°C to +85°C 10 µMAX —
VEE
IN-IN+
1
+
6 VCC
5 REF
OUT
MAX9041
MAX9051
SOT23
2
3 4
OUT
N.C.VEE
1
2
8
7
N.C.
VCC
IN-
IN+
REF
SO
3
4
6
5
MAX9041
MAX9051
INB-
INB+VEE
1
2
8
7
VCC
OUTBREF
INA+
OUTA
µMAX/SO
3
4
6
5
MAX9042
MAX9052
1
2
3
4
5
10
9
8
7
6
VCC
N.C.
OUTB
INB-INA+
INA-
REF
OUTA
MAX9043
MAX9053
µMAX
INB+VEE
TOP VIEW
MAX9038/MAX9039
MAX9041/MAX9043
MAX9051/MAX9053
1.23V/2.048V/
2.500V
OUT
IN+
*MAX9038 ONLY
IN-
REF
VIN VCC
0.1µF RPU*
VPU*
VEE
VCC
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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Pin Congurations (continued)
Typical Operating CircuitOrdering Information (continued)
Chip Information
PROCESS: CMOS
PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND
PATTERN NO.
6 UCSP B6-3 21-0097 —
5 SOT23 — 21-0057 90-0174
6 SOT23 — 21-0058 90-0175
8 SO — 21-0041 90-0096
8 FMAX — 21-0036 90-0092
10 FMAX — 21-0061 90-0330
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
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Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 10/99 Initial release —
1 1/00 Corrections to initial release —
2 4/00 Adding new part —
3 4/00 Increase in Max Supply Current specications —
4 10/02 Adding UCSP package for MAX9039 —
5 10/07 Adding input current ratings in Absolute Maximum Ratings, style changes —
6 3/09 Update Chip Information, Package Information, correct MAX9053 part number, style
changes 1, 2, 10, 12–19
7 3/13 Updated the General Description, Electrical Characteristics, and the Package
Information 1, 3-5, 13
8 9/13 Added the MAX9038 and lead-free information to the data sheet. 1–15
9 11/15 Added MAX9039BEBT+T10 to Ordering Information 1
10 1/17 Removed MAX9039BEBT+T10 from Ordering Information table 1
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX9038–MAX9043/
MAX9050–MAX9053
Micropower, Single-Supply, UCSP/SOT23
Comparator + Precision Reference ICs
© 2017 Maxim Integrated Products, Inc.
│
15
Revision History
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MAX9053AEUB+T MAX9039BEBT+T MAX9040AEUK+T MAX9040BEUK+T MAX9041AESA+ MAX9041AESA+T
MAX9041AEUT+T MAX9041BESA+ MAX9041BESA+T MAX9041BEUT+T MAX9042AESA+ MAX9042AESA+T
MAX9042AEUA+ MAX9042AEUA+T MAX9042BESA+ MAX9042BESA+T MAX9042BEUA+ MAX9042BEUA+T
MAX9043AEUB+ MAX9043AEUB+T MAX9043BEUB+ MAX9043BEUB+T MAX9050AEUK+T MAX9050BEUK+T
MAX9051AESA+ MAX9051AESA+T MAX9051AEUT+T MAX9052AESA+ MAX9052AESA+T MAX9052BESA+
MAX9052BESA+T MAX9052BEUA MAX9052BEUA+ MAX9052BEUA+T MAX9052BEUA-T MAX9053AEUB+
MAX9053BEUB+ MAX9053BEUB+T MAX9052AEUA MAX9052AEUA-T MAX9039BEBT-T MAX9040AEUK-T
MAX9041AESA MAX9041AESA-T MAX9041AEUT-T MAX9041BESA MAX9041BESA-T MAX9041BEUT-T
MAX9042AESA MAX9042AESA-T MAX9042AEUA MAX9042AEUA-T MAX9042BESA MAX9042BESA-T
MAX9043AEUB MAX9043AEUB-T MAX9043BEUB MAX9043BEUB-T MAX9050AEUK-T MAX9050BEUK-T
MAX9051AESA MAX9051AESA-T MAX9051AEUT-T MAX9052AESA MAX9052AESA-T MAX9052BESA
MAX9052BESA-T MAX9053AEUB MAX9053AEUB-T MAX9053BEUB MAX9053BEUB-T