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MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
General Description
Benefits and Features
The MAX40010 single-channel, high-side precision currentsense amplifier with an input common-mode voltage
range from 2.7V to 76V, making it ideal for communications,
automotive, data centers and other systems where highvoltage current monitoring is critical. The MAX40010 offer
accuracy specifications of less than 12μV (max) Input
Offset voltage and less than 0.1% (max) gain error. By
offering precision offset and gain error specifications, the
MAX40010 makes it possible to sense very small sense/
shunt resistors, further improving system efficiencies and
power dissipation through the sense element.
● Input Common Mode +2.7V to +76V
● Ultra-Tiny 1mm x 1.5mm 6-bump WLP and SOT23
Packages
● Low 12μV (max) Input Offset Voltage
● Low 0.1% (max) Gain Error
● Available Gain Options:
• G = 12.5V/V: MAX40010L
• G = 20V/V: MAX40010T
• G = 50V/V: MAX40010F
• G = 100V/V: MAX40010H
The MAX40010 features 80kHz of small signal bandwidth
and four unique gain options (12.5V/V, 20V/V, 50V/V, and
100V/V). The device’s current-sense inputs have EMIR
filters to reject RF found in communications equipment.
Applications
●
●
●
●
●
The MAX40010 operates over the -40° C to + 125°C
temperature range and is offered in a 6-bump, 1mm x
1.5mm wafer-lever package (WLP) with 0.5mm pitch and
a SOT23 U6SN+1 package.
Base-Stations and Communication Equipment
Server Backplanes/Data Centers
Automotive Sensing
Energy Management
Solar Panel Monitoring
Ordering Information appears at end of data sheet.
Typical Operating Circuit
ISENSE
VCM = 2.7V TO 76V
SYSTEM LOAD
RSENSE
RS-
RS+
VDD = 2.7V TO 5.5V
VDD
MAX40010
OUT
GND
19-100015; Rev 5; 10/20
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Absolute Maximum Ratings
VDD to GND..........................................................-0.3V to +6.0V
RS+, RS- to GND...................................................-0.3V to +80V
RS+ to RS- (Continuous).....................................................±24V
Continuous (> 1s) Input Current (Any Pin)........................±10mA
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Reflow Soldering Peak Temperature (Pb-free)................ +260°C
Package Thermal Characteristics (Note 1)
6-Bump WLP
Continuous Power Dissipation
(Derate mW/°C above +70°C)...................................12.34mW
Junction-to-Ambient Thermal Resistance (θJA)......81.03°C/W
6-Pin SOT23
Continuous Power Dissipation
(Derate mW/°C above +70°C)...................................13.40mW
Junction-to-Ambient Thermal Resistance (θJA)......74.60°C/W
Junction-to-Case Thermal Resistance (θJC)...............6.0°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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
(VRS+ = VRS- = +36V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C unless otherwise noted. Typical values are
at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2.7
5.5
V
TA = +25°C
350
-40°C < TA < +125°C
800
µA
2.7V ≤ VDD ≤ 5.5V
110
120
dB
Guaranteed by CMRR
2.7
76
V
DC CHARACTERISTICS
Supply Voltage
VDD
Supply Current
IDD
Power-Supply Rejection Ratio
PSRR
Input Common-Mode Voltage
Range
VCM
Guaranteed by PSRR
Input Bias Current at VRS+
and VRS-
IRS+, IRS-
65
µA
Input Offset Current
IRS+ - IRS-
400
nA
Input Leakage Current
IRS+, IRS-
VDD = 0V, VRS+ = 76V
5
µA
CMRR
+4.5V < VRS+ < +76V
Common-Mode Rejection Ratio
Input Offset Voltage
Input Offset Voltage Drift
Input Sense Voltage
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VOS
TCVOS
VSENSE
125
140
dB
TA = +25°C
±12
-40°C ≤ TA ≤ +85°C
±25
-40°C ≤ TA ≤ +125°C
±25
µV
130
nV/°C
MAX40010L (G = 12.5V/V)
200
MAX40010T (G = 20V/V)
125
MAX40010F (G = 50V/V)
50
MAX40010H (G =100V/V)
25
mV
Maxim Integrated │ 2
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Electrical Characteristics (continued)
(VRS+ = VRS- = +36V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C unless otherwise noted. Typical values are
at TA = +25°C.) (Note 2)
PARAMETER
Gain (Note 3)
Gain Error
SYMBOL
G
GE
Output Resistance
ROUT
Output Low Voltage
VOL
Output High Voltage
VOH
MIN
TYP
MAX
Full-Scale VSENSE = 200mV
CONDITIONS
12.5
Full-Scale VSENSE = 125mV
20
Full-Scale VSENSE = 50mV
50
Full-Scale VSENSE = 25mV
100
TA = +25°C
0.1
-40°C ≤ TA ≤ +85°C
0.5
-40°C ≤ TA ≤ +125°C
0.7
0.1
mΩ
Sink 500µA
Source 500µA
UNITS
V/V
%
15
mV
VDD 0.016
V
AC CHARACTERISTICS
Signal Bandwidth
BW -3dB
Gain = 50V/V Configuration
VSENSE > 5mV
80
kHz
AC Power Supply Rejection
Ratio
AC PSRR
f = 200kHz
40
dB
AC CMRR
AC CMRR
f = 200kHz
48
dB
∆VOUT = 2VP-P, 0.1% final VOUT settling
with 400Ω and 1nF onto 6pF ADC input
sampling capacitor
2
µs
With 240Ω isolation resistor
20
nF
Without any isolation resistor
200
pF
f = 1kHz
65
nV/√Hz
f = 1kHz, VOUT = 1VP-P
60
Output Transient Recovery Time
Capacitive Load Stability
Input Voltage Noise Density
CLOAD
en
Total Harmonic Distortion
THD
dB
Power-Up Time (Note 4)
200
µs
Saturation Recovery Time
10
µs
Note 2: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 3: Gain and offset voltage are calculated based on two point measurements: VSENSE1 = 20% full scale and VSENSE2 = 80%
full scale.
Note 4: Output is high-Z during power-up.
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Maxim Integrated │ 3
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Typical Operating Characteristics
(VRS+ = VRS- = +36V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.)
INPUT OFFSET VOLTAGE HISTOGRAM
6
4
2
0
-4
-3
-2
-1
0
1
2
3
INPUT OFFSET VOLTAGE (μV)
4
GAIN ERROR vs. TEMPERATURE toc04
0.2
-2
-3
-4
GAIN ERROR (%)
0
-0.05
0
50
100
TEMPERAUTRE (°C)
GAIN ERROR vs.
INPUT COMMON MODE VOTLAGE
VDD = 3.3V
150
toc05
-50
0
50
100
TEMPERATURE (°C)
SUPPLY CURRENT vs.
SUPPLY VOLTAGE
GAIN = 20V/V
toc07
TA = -40°C
OUTPUT VOTLAGE HIGH (mV)
0.4
TA = 25°C
0.35
TA = -40°C
0.3
0.25
20
0.05
GAIN = 20V/V
0
20
40
60
INPUT COMMON MODE VOLTAGE (V)
OUTPUT VOLTAGE HIGH vs.
SOURCE CURRENT
toc08
250
TA = 125°C
150
TA = 25°C
100
50
2.5
3.5
4.5
SUPPLY VOLTAGE (V)
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5.5
0
toc06
TA = -40°C
2
0
-2
TA = 25°C
-4
-6
TA = 125°C
2.5
3.5
4.5
SUPPLY VOLTAGE (V)
5.5
OUTPUT VOLTAGE LOW vs.
SINK CURRENT
300
toc09
GAIN = 20V/V
250
200
TA = 125°C
150
TA = 25°C
100
50
TA = -40°C
0.2
80
4
-10
80
GAIN = 20V/V
200
60
6
-8
TA = 125°C
GAIN = 20V/V
40
INPUT OFFSET VOLTAGE vs.
SUPPLY VOLTAGE
10
TA = 25°C
300
TA = 125°C
0
8
0.1
-0.1
150
TA = 125°C
12
OUTPUT VOTLAGE LOW (mV)
GAIN = 20V/V
-6
INPUT COMMON MODE VOLTAGE (V)
-0.05
-0.15
TA = 25°C
-4
-8
0
-0.1
0
-2
-10
0.15
0.05
2
-6
-50
TA = -40°C
4
-5
0.2
0.1
GAIN ERROR (%)
-1
0.25
0.15
SUPPLY CURRENT (mA)
INPUT OFFSET VOTLAGE (μV)
8
0
INPUT OFFSET VOTLAGE (μV)
INPUT OFFSET VOTLAGE (μV)
NUMBER OF OCCURANCE (N)
10
1
VDD = 3.3V
GAIN = 20V/V
6
toc03
12
2
INPUT OFFSET VOLTAGE vs.
INPUT COMMON MODE VOTLAGE
8
3
14
0.45
GAIN = 20V/V
4
16
-0.2
INPUT OFFSET VOLTAGE vs. TEMPERATURE
toc02
GAIN = 20V/V
18
5
toc01
20
0
2
4
6
8
SOURCE CURRENT (mA)
10
0
TA = -40°C
0
2
4
6
SINK CURRENT (mA)
8
10
Maxim Integrated │ 4
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Typical Operating Characteristics (continued)
(VRS+ = VRS- = +36V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.)
toc10
100
VCM = 12V
60
40
15
GAIN = 20V/V
50% FS OUTPUT
VCM = 12V
VDD =100mVP-P + 3.3VDC
0
GAIN = 20V/V
0.01
0.1
1
10
100
-20
1000
G = 20 V/V
20
20
0
toc12
VCM = 12V
25
40
20
GAIN vs. FREQUENCY
30
60
AC PSRR (dB)
AC CMRR (dB)
toc11
80
80
-20
AC PSRR vs. FREQUENCY
100
200mVP-P INPUT
MAGNITUDE (dB)
AC CMRR vs. FREQUENCY
120
0.01
0.1
1
10
100
FREQUENCY (kHz)
SMALL-SIGNAL STEP RESPONSE
LARGE-SIGNAL STEP RESPONSE
5
0
-5
-10
-15
-20
0.001
1000
FREQUENCY (kHz)
10
0.01
0.1
1
10
100
1000
FREQUENCY (kHz)
SATURATION RECOVERY RESPONSE
NO LOAD
10kΩ LOAD
120mV
20mV
400mV
VIN
VIN
10mV/div
0
0
50mV/div
200mV/div
2.4V
400mV
VOUT
VOUT
200mV/div
0
1V/div
0
INPUT VOLTAGE NOISE DENSITY vs.
FREQUENCY
toc16
300
TOTAL HARMONIC DISTORTION (dB)
200
150
100
50
10
1000
FREQUENCY (Hz)
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100000
1V/div
2μs/div
TOTAL HORMONIC DISTORTION vs.
FREQUENCY
toc17
0
50% FS OUTPUT
250
0
VOUT
0
200μs/div
200μs/div
INPUT VOLTAGE NOISE DENSITY (nV/rtHz)
VIN
0
TURN ON RESPONSE
toc18
1VP-P OUTPUT
VDD = 5.0V, VCM = 2.7V
-10
-20
2V/div
VDD
-30
G = 20 V/V
-40
-50
-60
-70
100mV/div
VOUT
-80
-90
V(RS+ - RS-) = 0mV
10
100
1000
10000
100000
100ms/div
FREQUENCY (Hz)
Maxim Integrated │ 5
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Typical Operating Characteristics (continued)
(VRS+ = VRS- = +36V, VDD = +3.3V, VSENSE = VRS+ - VRS- = 1mV, TA = -40°C to +125°C, unless otherwise noted. Typical values are
at TA = +25°C.)
TURN OFF RESPONSE
STABILITY vs. CAPACITIVE AND SERIES
ISOLATION RESISTOR
toc19
2V/div
VDD
100mV/div
VOUT
V(RS+ - RS-) =0mV
20ms/div
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ISOLATION RESISTANCE (Ω)
100
STABLE
10
1
0.1
UNSTABLE
0.01
0.01
0.1
1
10
100
1000
CAPACITIVE LOAD (nF)
Maxim Integrated │ 6
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Pin Configurations
TOP VIEW
MAX40010
+
RS-
A1
B1
RS+
NC
A2
B2
GND
VDD
A3
B3
OUT
NC
1
GND
2
OUT
3
+
MAX40010
WLP
6 RS-
5 RS+
4 VDD
SOT23-6
Pin Description
PIN
WLP
SOT23
B1
5
A1
A3
NAME
FUNCTION
RS+
External Resistor Power-Side Connection Input
6
RS-
External Resistor Load-Side Connection Input
4
VDD
Supply Voltage Input
B2
2
GND
Ground or Supply Return Input
B3
3
OUT
Output. Output is proportional to the magnitude of differential sense input voltage.
A2
1
NC
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No Connect.
Maxim Integrated │ 7
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Functional (or Block) Diagram
VSENSE
ILOAD1
RSENSE
RS+
RS-
RG1
RG2
MAX40010
A1
P1 P
A2
R1
RF
R1
GND
OUT
Figure 1. MAX40010 Functional Diagram
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Maxim Integrated │ 8
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Detailed Description
The MAX40010 high-side, current-sense amplifier features a 2.7V to 76V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current out of a battery as low as 2.7V and
enables high-side current sensing at voltages greater
than the supply voltage (VDD). The MAX40010 monitors
current through an external current-sense resistor and
amplifies the voltage across the resistor.
High-side current monitoring does not interfere with the
ground path of the load being measured, making the
MAX40010 particularly useful in a wide range of highvoltage systems.
The MAX40010 operates as follows: current from the
source flows through RSENSE to the load (Figure 1),
creating a sense voltage, VSENSE. The internal op amp
A1 force the current through an internal gain resistor RG1
at RS+ input, such that its voltage drop equals the voltage drop (VSENSE) across the external sense resistors
(RSENSE). The internal resistor at RS- input (RG2) has
the same value as RG1 to minimize the error. The current
through RG1 is sourced by a high-voltage p-channel FET.
Its source current is the same as the drain current which
flows through a second gain resistor, R1, producing a voltage VR1 = VSENSE x R1/ RG1.
The output voltage VOUT is produced from a second op
amp A2 with the gain (1 + RF1/ R1). Hence the VOUT =
ILOAD x RSENSE (R1/ RG1) x (1 + RF1/ R1). The value
of internal resistors R1, R2, RG1, RG2, RF are available
in Table 1.
Total gain is 12.5V/V for MAX40010L, 20V/V for the
MAX40010T, 50V/V for the MAX40010F, and 100V/V for
the MAX40010H.
Application Information
Recommended Component Values
Ideally, the maximum load current develops the full-scale
sense voltage across the current-sense resistor. Choose
the gain needed to yield the maximum output voltage
required for the application:
VOUT = VSENSE x AV
where VSENSE is the full-scale sense voltage, 200mV for
gain of 12.5V/V, 125mV for gain of 20V/V, 50mV for gain
of 50V/V, 25mV for gain of 100V/V, and AV is the gain of
the device.
In applications monitoring a high current, ensure that
RSENSE is able to dissipate its own I2R loss. If the resistor’s power dissipation exceeds the nominal value, its
value may drift or it may fail altogether.
The MAX40010 sense a wide variety of currents with different sense-resistor values.
Choosing the Sense Resistor
Choose RSENSE based on the following criteria:
• Voltage Loss: A high RSENSE value causes the powersource voltage to degrade through IR loss. For minimal
voltage loss, use the lowest RSENSE value.
• Accuracy: A high RSENSE value allows lower currents
measured more accurately. This is due to offsets becoming less significant when the sense voltage is larger. For
best performance, select RSENSE to provide approximately 200mV (gain of 12.5V/V), 125mV (gain of 20V/V),
or 50mV (gain of 50V/V), 25mV (gain of 100V/V) of sense
voltage for the full-scale current in each application.
Table 1. Internal Gain-Setting Resistors
GAIN (V/V)
R1, R2 (kΩ)
RG1, RG2 (kΩ)
RF (kΩ)
MAX40010L
12.5
25
10
100
MAX40010T
20
25
10
175
MAX40010F
50
25
10
475
MAX40010H
100
25
10
975
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Maxim Integrated │ 9
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
• Efficiency and Power Dissipation: At high current levels,
the I2R losses in RSENSE can be significant. Consider
this when choosing the resistor value and its power
dissipation (wattage) rating. In addition, the sense resistor’s
value might drift if it heats up excessively.
• Inductance: Keep inductance low if ISENSE has a large
high-frequency component. Wire-wound resistors have
the highest inductance, while metal film is somewhat
better. Low-inductance, metal-film resistors are also available.
Instead of being spiral wrapped around a core, as in metalfilm or wire wound resistors, they are a straight band of
metal and are available in values under 1Ω.
Take care to eliminate parasitic trace resistance from
causing errors in the sense voltage because of the high
currents that flow through RSENSE. Either use a fourterminal current-sense resistor or use Kelvin (force and
sense) PC board layout techniques.
EMIRR Input Filter
These devices have input EMI filters to prevent effects of
radio frequency interference on the output. The EMI filters
comprise passive devices that present significant higher
impedance to RF signals. See the EMIRR vs. Frequency
plot in the Typical Operating Characteristics section for
details.
Typical Application Circuit
An example of typical application (Figure 2) of this highvoltage, high-precision current-sense amplifier is in base
station systems where there is a need to monitor the
current flowing in the power amplifier. Such an amplifier,
depending on the technology, can be biased up to 50V
or 60V thus requiring a current-sense amplifier like the
MAX40010 with high voltage common mode. The very
low input offset voltage of the MAX40010 minimizes the
value of the external sense resistor, resulting in system
power saving.
VDD = 3.3V
OUTF
OUTS
MAX6126
VDD = 3.3V
RS+
250?
REF+
20?
VIN
MAX40010
20nF
MAX11125
REFOUTPUT
220nF
RSVDRAIN = 36V – 76V
µC
RFOUT
RFIN
Figure 2. MAX40010 Used in Base Station Application
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Maxim Integrated │ 10
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Turn On/Off Response
The internal POR (Power on Reset) structure creates the
inadvertent glitch, as shown in TOC18 and TOC19: typical
turn on and turn off response of MAX40010. The internal
POR event takes place below minimum VCC supply voltage
(2.7V) around 1.7V. During this event the bias generators
are defined, the internal blocks are set to known state
and as a result, an output (VOUT) glitch is observed. The
device may take tens of μs to settle to final value during
power on and less than 10ms to settle during turn off.
Output Filtering
To avoid output noise and transient overshoot, an RC
filter with R = 500Ω and CL = 14.7nF at the output is
recommended (Figure 3). This also benefits when the
current sense amplifier is connected to a sample and hold
ADC’s, where the CL will act as a charge reservoir during
sample phase. when choosing different values of R and
CL, refer to TOC20 (Stability vs. Isolation Resistance and
Capacitive Load) for more information.
MAX40010
RS-
R = 500Ω
RS+
R = 10kΩ
(OPTIONAL)
CL = 14.7nF
Figure 3. Optional Output Filtering
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Maxim Integrated │ 11
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Ordering Information
PART
GAIN (V/V)
TEMP RANGE
PIN-PACKAGE
TOP MARK
MAX40010LAUT+
12.5
-40°C to +125°C
6 SOT23
+ACUR
MAX40010LAUT+T
12.5
-40°C to +125°C
6 SOT23
+ACUR
MAX40010LAWT+
12.5
-40°C to +125°C
6 WLP
+DX
MAX40010LAWT+T
12.5
-40°C to +125°C
6 WLP
+DX
MAX40010TAUT+
20
-40°C to +125°C
6 SOT23
+ACUS
MAX40010TAUT+T
20
-40°C to +125°C
6 SOT23
+ACUS
MAX40010TAWT+*
20
-40°C to +125°C
6 WLP
+DY
MAX40010TAWT+T*
20
-40°C to +125°C
6 WLP
+DY
MAX40010FAUT+
50
-40°C to +125°C
6 SOT23
+ACUT
MAX40010FAUT+T
50
-40°C to +125°C
6 SOT23
+ACUT
MAX40010FAWT+*
50
-40°C to +125°C
6 WLP
+DV
MAX40010FAWT+T*
50
-40°C to +125°C
6 WLP
+DV
MAX40010HAUT+
100
-40°C to +125°C
6 SOT23
+ACUU
MAX40010HAUT+T
100
-40°C to +125°C
6 SOT23
+ACUU
MAX40010HAWT+*
100
-40°C to +125°C
6 WLP
+DW
MAX40010HAWT+T*
100
-40°C to +125°C
6 WLP
+DW
*Future product—contact factory for availability.
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = tape and reel.
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.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
6 WLP
W61K1+1
21-100121
Refer to Application Note 1891
6 SOT23
U6SN+1
21-0058
91-0175
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Maxim Integrated │ 12
MAX40010
76V Precision, High-Voltage,
Current-Sense Amplifier
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
7/17
Initial release
—
1
10/17
Changed future product status for MAX40010LAUT+, MAX40010TAUT+,
and MAX40010HAUT+ in Ordering Information table
10
2
1/18
Added TOCs 18–20, added “Turn On/Off” and “Output Filtering” sections, and
Figure 3
3
10/18
Updated Ordering Information
12
4
7/20
Updated Ordering Information
12
5
10/20
Updated EC Table
3
DESCRIPTION
5, 6, 9, 10
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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 specifications 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.
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