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MAX4069–MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
General Description
The MAX4069–MAX4072 low-cost, bidirectional, high-
side, current-sense amplifiers are ideal for monitoring
battery charge and discharge currents in notebooks, cell
phones, and other portable equipment. They feature up
to 24V input common-mode voltage range, low 100µA
supply current (which drops to only 10µA in shutdown),
and a total output error of less than 1.5%. The wide 1.35V
to 24V input common-mode range is independent of the
supply voltage, ensuring that the current-sense feedback
remains accurate even when connected to a battery pack
in deep discharge.
To achieve maximum flexibility, an external current-sense
resistor is used along with a Gain Select pin to choose
either 50V/V or 100V/V. A single output pin continuously
monitors the transition from charge to discharge and
avoids the need for a separate polarity output. The
MAX4070 contains an internal 2.5V reference. The charging
current is represented by an output voltage from 2.5V to
VCC, while discharge current is given from 2.5V to GND.
The MAX4071 is similar, but with a reference voltage of
1.5V. The MAX4069 has an adjustable reference voltage,
set by two external resistors. The MAX4072 has an input
for an external reference.
The MAX4069/MAX4071/MAX4072 operate from a 2.7V
to 24V single supply. The MAX4070 operates from a
3.6V to 24V single supply. All devices are specified over
the automotive operating temperature range, -40°C to
+125°C. The MAX4070/MAX4071/MAX4072 are available in
8-pin µMAX and 8-pin thin QFN packages. The MAX4069
is available in a 10-pin µMAX® package.
Applications
● Notebook Fuel Gauging
● Smart-Battery Packs/Chargers
● Motor Control
● Power-Management Systems
● Cell-Phone Battery-Current Monitoring
μMAX is a registered trademark of Maxim Integrated Products,
Inc.
Pin Configurations and Selector Guide appear at end of
data sheet.
Features
● Bidirectional, Compact, Current-Sense Solution
● Total Output Error Less than 1.5%
● Selectable Gain of 50V/V or 100V/V
● Wide 1.35V to 24V Common-Mode Range
Independent of Supply Voltage
● 2.7V to 24V Single-Supply Operation
● Internal Precision Reference
Adjustable (MAX4069)
2.50V (MAX4070)
1.50V (MAX4071)
Low 100μA Supply Current
10μA Supply Current in Shutdown
● Available in Space-Saving Packages
8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
• 8-Pin μMAX (MAX4070/MAX4071/MAX4072)
• 10-Pin μMAX (MAX4069)
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX4069AUB+ -40°C to +125°C 10 µMAX
MAX4070AUA+ -40°C to +125°C 8 µMAX
MAX4070ATA+ -40°C to +125°C 8 Thin QFN-EP*
MAX4071AUA+ -40°C to +125°C 8 µMAX
MAX4071ATA+ -40°C to +125°C 8 Thin QFN-EP*
MAX4072AUA+ -40°C to +125°C 8 µMAX
MAX4072ATA+ -40°C to +125°C 8 Thin QFN-EP*
*EP = Exposed pad.
TOP
MARK
ADH
ADI
ADJ
Typical Operating Circuit
VBATT = 1.35V TO 24V
FROM BATTERY
CHARGER
RSENSE
VCC = 3.6V TO 24V
RS-
VCC
RS+
MAX4070
GSEL
OUT
LOAD
TO ADC
SHDN
REFOUT
GND
2.5V
19-2423; Rev 4; 11/16

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MAX4069–MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Absolute Maximum Ratings
VCC, RS+, RS- to GND..........................................-0.3V to +26V
OUT to GND.................. -0.3V to Lesser of (VCC + 0.3V) or 15V
Differential Input Voltage (VRS+ - VRS-)..............................±0.3V
GSEL, SHDN, REFOUT, REFIN
and ADJ to GND.................................... -0.3V to (VCC + 0.3V)
OUT Short-Circuit Duration to GND
or to Lesser of (VCC or 15V)..................................Continuous
REFOUT Short Circuit to VCC or GND......................Continuous
Current into Any Pin..........................................................±20mA
Continuous Power Dissipation (TA = +70°C)
8-Pin µMAX (derate 4.5mW/°C above +70°C).............362mW
8-Pin Thin QFN (derate 24.4mW/°C above +70°C)..... 1951mW
10-Pin µMAX (derate 5.6 mW/°C above +70°C).......444.4mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, VSHDN = VCC, VGSEL = GND, VREFIN = 2.5V
(MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER
Operating Voltage Range
(Note 3)
Input-Referred Offset Voltage
(Note 5)
Common-Mode Input Range
Common-Mode Rejection Ratio
Supply Current
Shutdown Supply Current
Leakage Current
Input Bias Current
Recommended Full-Scale Sense
Voltage (Note 6)
SYMBOL
VCC
VOS
CMVR
CMRR
ICC
ICC SHDN
IRS+, IRS-
VSENSE
CONDITIONS
MAX4069/MAX4071/MAX4072 (Note 4)
MAX4070
VCC = VRS+ =
VRS- = 12V
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
Guaranteed by CMRR test
1.35V ≤ VRS+ = VRS- ≤ 24V, VCC = 12V
VCC = VRS+ = VRS- = 24V, RL = open,
TA = TMIN to TMAX
VCC = VRS+ = VRS- = 5.5V,
SHDN = GND, TA = +25°C
VCC = VRS+ = VRS- = 24V,
SHDN = GND
VRS+ = VRS- = 24V, VCC = 0V
VCC = VRS+ = VRS- = 24V
Gain = 50V/V
Gain = 100V/V
MIN TYP MAX UNITS
2.7 24
V
3.6 24
0.08 0.25
0.8 mV
1
1.35
24 V
100 120
dB
100 250
µA
9
10 30
µA
0.1 0.5
µA
0 2.4 5
µA
75
mV
50
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MAX4069–MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Electrical Characteristics (continued)
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, VSHDN = VCC, VGSEL = GND, VREFIN = 2.5V
(MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
VSENSE = 75mV,
VCC = VRS+ = 12V,
gain = 50
VSENSE = 50mV,
VCC = VRS+ = 12V,
gain = 100
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
MAX4069/MAX4070/
MAX4072:
VSENSE = -35mV,
VCC = VRS+ = 12V,
gain = 50
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
MIN
TYP
±0.25
±0.25
±0.4
MAX
±1.0
±1.5
±2.0
±1.0
±1.5
±2.5
±1.0
UNITS
±2.0
±3.0
Total OUT Voltage Error (Note 7)
MAX4069/MAX4070/
MAX4072:
VSENSE = -17.5mV,
VCC = VRS+ = 12V,
gain = 100
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
±0.8 ±2.0
±4.0
±6
%
MAX4071:
VSENSE = -15mV,
VCC = VRS+ = 12V,
gain = 50
MAX4071:
VSENSE = -7.5mV,
VCC = VRS+ = 12V,
gain = 100
VSENSE = 3mV,
VCC = 12V,
VRS+ = 12V
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
TA = +25°C
TA = -40°C to +85°C
TA = TMIN to TMAX
TA = +25°C
±1.0 ±2.5
±4.0
±6.0
±2.0 ±5
±10
±15
±3
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Maxim Integrated 3

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MAX4069–MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Electrical Characteristics (continued)
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, VSHDN = VCC, VGSEL = GND, VREFIN = 2.5V
(MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER
OUT Voltage High
OUT Voltage Low
-3dB Bandwidth
Gain
Capacitive-Load Stability
Power-Supply Rejection Ratio
Logic Low Voltage (GSEL, SHDN)
Logic High Voltage (GSEL, SHDN)
Gain-Select Input Current
Shutdown Input Current
SYMBOL
CONDITIONS
IOUT = 10µA,
VSENSE = 100mV,
VRS+ = VCC
VCC - VOH
IOUT = 500µA,
VSENSE = 100mV,
VRS+ = VCC
MAX4071,
VCC = 2.7V
MAX4069/MAX4070/
MAX4072,
VCC = 3.6V
MAX4071,
VCC = 2.7V
MAX4069/MAX4070/
MAX4072,
VCC = 3.6V
MAX4071,
IOUT = -10µA,
VSENSE = -100mV,
VRS+ = VCC
VCC = 2.7V
MAX4069/MAX4070/
MAX4072,
VCC = 3.6V
VOL MAX4071,
IOUT = -500µA,
VSENSE = -100mV,
VRS+ = VCC
VCC = 2.7V
MAX4069/MAX4070/
MAX4072,
VCC = 3.6V
VSENSE = 50mV, Gain = 50V/V
BW VCC = 12V,
CL = 100pF
Gain = 100V/V
GSEL = GND
AV GSEL = VCC
PSRR
VIL
VIH
IGSEL
ISHDN
VCC = 2.7V to 24V
(MAX4069/MAX4071/MAX4072),
VCC = 3.6V to 24V (MAX4070)
VCC = 3.6V or 24V
VCC = 3.6V or 24V
GSEL = VCC = 24V or GND
SHDN = VCC = 24V
SHDN = GND, VCC = 24V
MIN
100
2
TYP
65
MAX UNITS
150
65 150
mV
90 250
90 250
5 20
5 20
100 250
mV
100 250
100
40
50
100
100
120
0.6
0.01 1
3 12
0.01 1
kHz
V/V
pF
dB
V
V
µA
µA
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Maxim Integrated 4

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MAX4069–MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
Electrical Characteristics (continued)
(VRS+ = VRS- = VCC = 2.7V to 24V, VSENSE = VRS+ - VRS- = 0V, IREFOUT = 0, VSHDN = VCC, VGSEL = GND, VREFIN = 2.5V
(MAX4072), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C and at VCC = VRS+ = 12V.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
REFOUT (MAX4069/MAX4070/MAX4071)
MAX4069,
VCC = 12V
(Note 2)
TA = +25°C
TA = TMIN to TMAX
Reference Output Voltage
Reference Output Voltage
Temperature Coefficient
Load Regulation
Line Regulation
REF Capacitive-Load Stability
VREF
TCVREF
∆VREFOUT
/∆IREF
∆VREF/
∆VCC
MAX4070,
VCC = 12V
TA = +25°C
TA = TMIN to TMAX
MAX4071,
VCC = 12V
TA = +25°C
TA = TMIN to TMAX
VCC = 12V
-40°C ≤ TA ≤ +85°C
TA = TMIN to TMAX
IREFOUT = 0 to 500µA
IREFOUT = 0 to -100µA
2.7V ≤ VCC ≤ 24V
Reference Adjust Voltage
Threshold
VADJ
MAX4069, VCC = 12V
Reference Output Voltage Range
Reference Adjust Input Current
REFIN (MAX4072 ONLY)
IADJ
MAX4069, range adjustable with R1 and
R2, VCC = 12V
MAX4069, VCC = 12V, VADJ = 1.23V
Input-Voltage Range
Input Current
VCC = 12V
REFIN = 2.5V, VCC = 12V
MIN TYP MAX UNITS
2.44 2.49 2.54
2.39 2.59
2.45 2.5 2.55
2.40 2.60
V
1.47 1.5 1.53
1.44 1.56
15
ppm/°C
20
2
mV/mA
4
20 µV/V
500 pF
1.230
V
VADJ
to +4
100
V
nA
1 4V
-60 +20 µA
Note 1: All devices are 100% tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 2: R1 = 215kΩ, R2 = 210kΩ for the MAX4069 only (see Functional Diagram). This sets REFOUT to 2.49V nominal.
Note 3: Guaranteed by the PSRR test.
Note 4: The REFOUT voltage for the MAX4069 should be set such that it does not exceed VCC - 1.1V. Similarly, the maximum
REFIN voltage for the MAX4072 should also be less than VCC - 1.1V.
Note 5: Input-Referred Offset Voltage is defined as the voltage difference between OUT and REFOUT, divided by the selected gain
of either 50 or 100, when VSENSE = VRS+ - VRS- = 0V.
Note 6: The negative full-scale sense voltage is limited by the voltage range of OUT from VREFOUT to GND.
Note 7: Total OUT Voltage Error is the sum of offset voltage and gain errors. The output voltage is measured relative to the
reference (REFOUT or REFIN).
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Maxim Integrated 5