General Description
The MAX4069MAX4072 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 fea-
ture up to 24V input common-mode voltage range, low
100A supply current (which drops to only 10A 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 V
CC
, while discharge current is given from
2.5V to GND. The MAX4071 is similar, but with a refer-
ence 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 MAX and 8-pin thin QFN packages. The
MAX4069 is available in a 10-pin MAX package.
Applications
Notebook Fuel Gauging
Smart-Battery Packs/Chargers
Motor Control
Power-Management Systems
Cell-Phone Battery-Current Monitoring
Features
o Bidirectional, Compact, Current-Sense Solution
o Total Output Error Less than 1.5%
o Selectable Gain of 50V/V or 100V/V
o Wide 1.35V to 24V Common-Mode Range
Independent of Supply Voltage
o 2.7V to 24V Single-Supply Operation
o Internal Precision Reference
Adjustable (MAX4069)
2.50V (MAX4070)
1.50V (MAX4071)
o Low 100A Supply Current
o 10A Supply Current in Shutdown
o Available in Space-Saving Packages
8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
8-Pin MAX (MAX4070/MAX4071MAX4072)
10-Pin MAX (MAX4069)
MAX4069MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
________________________________________________________________ Maxim Integrated Products
1
Ordering Information
MAX4070
V
BATT
= 1.35V TO 24V
V
CC
= 3.6V TO 24V
FROM BATTERY
CHARGER
R
SENSE
LOAD
TO ADC
2.5V
V
CC
GSEL
GND
RS-
RS+
REFOUT
OUT
SHDN
Typical Operating Circuit
19-2423; Rev 2; 1/03
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
PART
TEMP RANGE
PIN-PACKAGE
TOP
MARK
MAX4069AUB
-40
C to +125C 10 MAX
--
MAX4070AUA
-40
C to +125C 8 MAX
--
MAX4070ATA
-40
C to +125C 8 Thin QFN-EP*
ABN
MAX4071AUA
-40
C to +125C 8 MAX
--
MAX4071ATA
-40
C to +125C 8 Thin QFN-EP*
ABO
MAX4072AUA
-40
C to +125C 8 MAX
--
MAX4072ATA
-40
C to +125C 8 Thin QFN-EP*
ABP
Pin Configurations appear at end of data sheet.
Selector Guide
PART
REFERENCE
SUPPLY
VOLTAGE
RANGE (V)
COMMON-
MODE RANGE
(V)
MAX4069
ADJUSTABLE
2.7 to 24
1.35 to 24
MAX4070
2.5V
3.6 to 24
1.35 to 24
MAX4071
1.5V
2.7 to 24
1.35 to 24
MAX4072
EXTERNAL
2.7 to 24
1.35 to 24
*EP = Exposed paddle.
MAX4069MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
RS
+ = V
RS
- = V
CC
= 2.7V to 24V, V
SENSE
= V
RS
+ - V
RS
- = 0V, I
REFOUT
= 0, V
SHDN
= V
CC
, V
GSEL
= GND, V
REFIN
= 2.5V (MAX4072),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C and at V
CC
= V
RS
+ = 12V.) (Notes 1, 2)
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.
V
CC
, RS+, RS- to GND ...........................................-0.3V to +26V
OUT to GND ....................-0.3V to Lesser of (V
CC
+ 0.3V) or 15V
Differential Input Voltage (V
RS
+ - V
RS
-) ..............................
0.3V
GSEL, SHDN, REFOUT, REFIN
and ADJ to GND.....................................-0.3V to (V
CC
+ 0.3V)
OUT Short-Circuit Duration to GND
or to Lesser of (V
CC
or 15V) ...................................Continuous
REFOUT Short Circuit to V
CC
or GND........................Continuous
Current into Any Pin ..........................................................
20mA
Continuous Power Dissipation (T
A
= +70
C)
8-Pin MAX (derate 4.5 mW/
C above +70C) ............362mW
8-Pin Thin QFN (derate 24.4mW/
C above +70C) ...1951mW
10-Pin MAX (derate 5.6 mW/
C above +70C) .......444.4mW
Operating Temperature Range .........................-40
C to +125C
Junction Temperature ......................................................+150
C
Storage Temperature Range .............................-65
C to +150C
Lead Temperature (soldering, 10s) .................................+300
C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4069/MAX4071/MAX4072 (Note 4)
2.7
24
Operating Voltage Range
(Note 3)
V
CC
MAX4070
3.6
24
V
T
A
= +25
C
0.08
0.25
T
A
= -40
C to +85C
0.8
Input-Referred Offset Voltage
(Note 5)
V
OS
V
CC
= V
RS+
=
V
RS-
= 12V
T
A
= T
MIN
to T
MAX
1
mV
Common-Mode Input Range
CMVR
Guaranteed by CMRR test
1.35
24
V
Common-Mode Rejection Ratio
CMRR
1.35V
V
RS+
=
V
RS-
24V, V
CC
= 12V
100
120
dB
Supply Current
I
CC
V
CC
= V
RS+
= V
RS-
= 24V, R
L
= open,
T
A
= T
MIN
to T
MAX
100
250
A
V
CC
= V
RS+
= V
RS-
= 5.5V,
SHDN = GND, T
A
= +25
C
9
Shutdown Supply Current
I
CC SHDN
V
CC
= V
RS+
= V
RS-
= 24V,
SHDN = GND
10
30
A
Leakage Current
V
RS+
= V
RS-
= 24V, V
CC
= 0V
0.1
0.5
A
Input Bias Current
I
RS+,
I
RS-
V
CC
= V
RS+
= V
RS-
= 24V
0
2.4
5
A
Gain = 50V/V
75
Recommended Full-Scale Sense
Voltage (Note 6)
V
SENSE
Gain = 100V/V
50
mV
MAX4069MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
RS
+ = V
RS
- = V
CC
= 2.7V to 24V, V
SENSE
= V
RS
+ - V
RS
- = 0V, I
REFOUT
= 0, V
SHDN
= V
CC
, V
GSEL
= GND, V
REFIN
= 2.5V (MAX4072),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C and at V
CC
= V
RS
+ = 12V.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= +25
C
0.25
1.0
T
A
= - 40
C to + 85C
1.5
V
SENSE
= 75mV,
V
CC
= V
RS+
= 12V,
gain = 50
T
A
= T
MIN
to T
MAX
2.0
T
A
= +25
C
0.25
1.0
T
A
= - 40
C to + 85C
1.5
V
SENSE
= 50mV,
V
CC
= V
RS+
= 12V,
gain = 100
T
A
= T
MIN
to T
MAX
2.5
T
A
= +25
C
0.4
1.0
T
A
= - 40
C to + 85C
2.0
MAX4069/MAX4070/
MAX4072:
V
SENSE
= -35mV,
V
CC
= V
RS+
= 12V,
gain = 50
T
A
= T
MIN
to T
MAX
3.0
T
A
= +25
C
0.8
2.0
T
A
= - 40
C to + 85C
4.0
MAX4069/MAX4070/
MAX4072:
V
SENSE
= -17.5mV,
V
CC
= V
RS+
= 12V,
gain = 100
T
A
= T
MIN
to T
MAX
6
T
A
= +25
C
1.0
2.5
T
A
= - 40
C to + 85C
4.0
MAX4071:
V
SENSE
= -15mV,
V
CC
= V
RS+
= 12V,
gain = 50
T
A
= T
MIN
to T
MAX
6.0
T
A
= +25
C
2.0
5
T
A
= - 40
C to + 85C
10
MAX4071:
V
SENSE
= -7.5mV,
V
CC
= V
RS+
= 12V,
gain = 100
T
A
= T
MIN
to T
MAX
15
Total OUT Voltage Error (Note 7)
V
SENSE
= 3mV,
V
C C
= 12V , V
RS +
= 12V
T
A
= +25
C
3
%
MAX4069MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
RS
+ = V
RS
- = V
CC
= 2.7V to 24V, V
SENSE
= V
RS
+ - V
RS
- = 0V, I
REFOUT
= 0, V
SHDN
= V
CC
, V
GSEL
= GND, V
REFIN
= 2.5V (MAX4072),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C and at V
CC
= V
RS
+ = 12V.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX4071,
V
CC
= 2.7V
65
150
I
OUT
= 10A,
V
SENSE
= 100mV,
V
RS+
= V
CC
MAX4069/MAX4070/
MAX4072,
V
CC
= 3.6V
65
150
MAX4071,
V
CC
= 2.7V
90
250
OUT Voltage High
V
CC
- V
OH
I
OUT
= 500A,
V
SENSE
= 100mV,
V
RS+
= V
CC
MAX4069/MAX4070/
MAX4072,
V
CC
= 3.6V
90
250
mV
MAX4071,
V
CC
= 2.7V
5
20
I
OUT
= -10A,
V
SENSE
= -100mV,
V
RS+
= V
CC
MAX4069/MAX4070/
MAX4072,
V
CC
= 3.6V
5
20
MAX4071,
V
CC
= 2.7V
100
250
OUT Voltage Low
V
OL
I
OUT
= -500A,
V
SENSE
= -100mV,
V
RS+
= V
CC
MAX4069/MAX4070/
MAX4072,
V
CC
= 3.6V
100
250
mV
Gain = 50V/V
100
-3dB Bandwidth
BW
V
SENSE
= 50mV,
V
CC
= 12V, C
L
= 100pF Gain = 100V/V
40
kHz
GSEL = GND
50
Gain
A
V
GSEL = V
CC
100
V/V
Capacitive-Load Stability
100
pF
Power-Supply Rejection Ratio
PSRR
V
CC
= 2.7V to 24V
(MAX4069/MAX4071/MAX4072),
V
CC
= 3.6V to 24V (MAX4070)
100
120
dB
Logic Low Voltage (GSEL, SHDN)
V
IL
V
CC
= 3.6V or 24V
0.6
V
Logic High Voltage (GSEL, SHDN)
V
IH
V
CC
= 3.6V or 24V
2
V
Gain-Select Input Current
I
GSEL
GSEL = V
CC
= 24V or GND
0.01
1
A
SHDN
= V
CC
= 24V
3
12
Shutdown Input Current
I
SHDN
SHDN = GND, V
CC
= 24V
0.01
1
A
MAX4069MAX4072
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(V
RS
+ = V
RS
- = V
CC
= 2.7V to 24V, V
SENSE
= V
RS
+ - V
RS
- = 0V, I
REFOUT
= 0, V
SHDN
= V
CC
, V
GSEL
= GND, V
REFIN
= 2.5V (MAX4072),
T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25
C and at V
CC
= V
RS
+ = 12V.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
REFOUT (MAX4069/MAX4070/MAX4071)
T
A
= +25
C
2.44
2.49
2.54
MAX4069,
V
CC
= 12V
(Note 2)
T
A
= T
MIN
to T
MAX
2.39
2.59
T
A
= +25
C
2.45
2.5
2.55
MAX4070,
V
CC
= 12V
T
A
= T
MIN
to T
MAX
2.40
2.60
T
A
= +25
C
1.47
1.5
1.53
Reference Output Voltage
V
REF
MAX4071,
V
CC
= 12V
T
A
= T
MIN
to T
MAX
1.44
1.56
V
-40
C T
A
+85C
15
Reference Output Voltage
Temperature Coefficient
TCV
REF
V
CC
= 12V
T
A
= T
MIN
to T
MAX
20
ppm/
C
I
REFOUT
= 0 to 500A
2
Load Regulation
V
REFOUT
/
I
REF
I
REFOUT
= 0 to -100A
4
mV/mA
Line Regulation
V
REF/
V
CC
2.7V
V
CC
24V
20
V/V
REF Capacitive-Load Stability
500
pF
Reference Adjust Voltage
Threshold
V
ADJ
MAX4069, V
CC
= 12V
1.230
V
Reference Output Voltage Range
MAX4069, range adjustable with R1
and R2,
V
CC
= 12V
V
ADJ
to
+4
V
Reference Adjust Input Current
I
ADJ
MAX4069, V
CC
= 12V, V
ADJ
= 1.23V
100
nA
REFIN (MAX4072 only)
Input-Voltage Range
V
CC
= 12V
1
4
V
Input Current
REFIN = 2.5V, V
CC
= 12V
-60
+20
A
Note 1: All devices are 100% tested at T
A
= +25
C. Limits over temperature are guaranteed by design.
Note 2: R1 = 215k
, R2 = 210k 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 V
CC
- 1.1V. Similarly, the maximum REFIN
voltage for the MAX4072 should also be less than V
CC
- 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 V
SENSE
= V
RS+
- V
RS-
= 0V.
Note 6: The negative full-scale sense voltage is limited by the voltage range of OUT from V
REFOUT
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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