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PDF MAX4070ATA Data sheet ( Hoja de datos )
| Número de pieza | MAX4070ATA | |
| Descripción | Bidirectional / High-Side / Current-Sense Amplifiers with Reference | |
| Fabricantes | Maxim Integrated | |
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19-2423; Rev 2; 1/03
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 fea-
ture 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 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 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
Selector Guide
PART
MAX4069
MAX4070
MAX4071
MAX4072
REFERENCE
ADJUSTABLE
2.5V
1.5V
EXTERNAL
SUPPLY
VOLTAGE
RANGE (V)
2.7 to 24
3.6 to 24
2.7 to 24
2.7 to 24
COMMON-
MODE RANGE
(V)
1.35 to 24
1.35 to 24
1.35 to 24
1.35 to 24
Pin Configurations appear at end of data sheet.
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 100µA Supply Current
o 10µA Supply Current in Shutdown
o Available in Space-Saving Packages
8-Pin Thin QFN (MAX4070/MAX4071/MAX4072)
8-Pin µMAX (MAX4070/MAX4071MAX4072)
10-Pin µMAX (MAX4069)
Ordering Information
PART
MAX4069AUB
MAX4070AUA
MAX4070ATA
TEMP RANGE PIN-PACKAGE
-40°C to +125°C 10 µMAX
-40°C to +125°C 8 µMAX
-40°C to +125°C 8 Thin QFN-EP*
TOP
MARK
—
—
ABN
MAX4071AUA -40°C to +125°C 8 µMAX
—
MAX4071ATA -40°C to +125°C 8 Thin QFN-EP* ABO
MAX4072AUA -40°C to +125°C 8 µMAX
MAX4072ATA -40°C to +125°C 8 Thin QFN-EP*
—
ABP
*EP = Exposed paddle.
Typical Operating Circuit
VBATT = 1.35V TO 24V
RSENSE
FROM BATTERY
CHARGER
RS- RS+
LOAD
VCC = 3.6V TO 24V
VCC
MAX4070
GSEL
OUT
TO ADC
SHDN
REFOUT
GND
2.5V
________________________________________________________________ Maxim Integrated Products 1
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.
1 page  
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
REFOUT (MAX4069/MAX4070/MAX4071)
CONDITIONS
MIN TYP MAX UNITS
Reference Output Voltage
Reference Output Voltage
Temperature Coefficient
Load Regulation
Line Regulation
REF Capacitive-Load Stability
Reference Adjust Voltage
Threshold
MAX4069,
VCC = 12V
(Note 2)
TA = +25°C
TA = TMIN to TMAX
VREF
TCVREF
∆VREFOUT
/∆IREF
MAX4070,
TA = +25°C
VCC = 12V
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
∆VREF/
∆VCC
2.7V ≤ VCC ≤ 24V
VADJ MAX4069, VCC = 12V
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
Reference Output Voltage Range
Reference Adjust Input Current
REFIN (MAX4072 only)
Input-Voltage Range
Input Current
MAX4069, range adjustable with R1 and R2,
VCC = 12V
IADJ MAX4069, VCC = 12V, VADJ = 1.23V
VADJ to
+4
100
VCC = 12V
REFIN = 2.5V, VCC = 12V
14
-60 +20
V
nA
V
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).
_______________________________________________________________________________________ 5
5 Page 
Bidirectional, High-Side, Current-Sense
Amplifiers with Reference
IDISCHARGE
2
CELLS
RSENSE
ICHARGE
5V
RS-
VCC
RS+
LOAD
VOUT - VREF
2.5V
MAX4070
GSEL OUT TO ADC
-25mV
0
SHDN
REFOUT
GND
2.5V
DISCHARGE
CURRENT -2.5V
AV = 100
CHARGE
CURRENT
25mV
50mV
VSENSE
Figure 2. Bidirectional Current Monitor
External Reference (MAX4072)
The MAX4072 contains REFIN pin for external refer-
ence voltage. The allowable voltage range on REFIN is
1V (min) to 4V (max) with VCC ≥ 5.1V.
Reference Output
(MAX4069/MAX4060/MAX4071)
The REFOUT of the MAX4069/MAX4070/MAX4071 can
sink 100µA and source 500µA. Keep the total capaci-
tance on REFOUT under 500pF to maintain stability.
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, 75mV for
gain of 50V/V, or 50mV for gain of 100V/V. AV is the
gain of the device.
In applications monitoring high current, ensure that
RSENSE is able to dissipate its own I2R loss. If the resis-
tor’s power dissipation is exceeded, its value may drift
or it may fail altogether, causing a differential voltage
across the terminals in excess of the absolute maxi-
mum ratings. Use resistors specified for current- sens-
ing applications.
The MAX4069–MAX4072 sense a wide variety of cur-
rents with different sense-resistor values. Table 1 lists
common resistor values for typical operation of these
devices. Listed output voltage is with respect to REF.
Sense Resistor, RSENSE
Choose RSENSE based on the following criteria:
Voltage Loss: A high RSENSE value causes the power-
source voltage to degrade through IR loss. For minimal
voltage loss, use the lowest RSENSE value.
Accuracy: A high RSENSE value allows lower currents
to be measured more accurately. This is because off-
sets become less significant when the sense voltage is
larger. For best performance, select RSENSE to provide
approximately 75mV (gain of 50V/V) or 50mV (gain of
100V/V) of sense voltage for the full-scale current in
each application.
Efficiency and Power Dissipation: At high-current lev-
els, the I2R losses in RSENSE can be significant. Take
this into consideration when choosing the resistor value
and its power dissipation (wattage) rating. Also, the
sense resistor’s value might drift if it is allowed to heat
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 round a
______________________________________________________________________________________ 11
11 Page | ||
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| PDF Descargar | [ Datasheet MAX4070ATA.PDF ] | |
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