MAX4372HEBT+T ,Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Outputfeatures a voltage output that eliminates the need ● 0.3mV Input Offset Voltagefor gain-setting res ..
MAX4372HESA ,Low-Cost, SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage OutputApplicationsMAX4372FEUK-T -40°C to +85°C 5 SOT23-5 ADIVMAX4372FESA -40°C to +85°C 8 SO —Power-Manag ..
MAX4372HEUK+T ,Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage OutputFeaturesThe MAX4372 low-cost, precision, high-side current- ● Low-Cost, Compact Current-Sense Solut ..
MAX4372HEUK-T ,Low-Cost / SOT23 / Micropower / High-Side Current-Sense Amplifier with Voltage OutputELECTRICAL CHARACTERISTICS(V = 0 to +28V, V = +2.7V to +28V, V = 0, R = 1MΩ, T = T to T , unless ot ..
MAX4372TEBT+T ,Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage OutputMAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output
MAX4372TESA ,Low-Cost / SOT23 / Micropower / High-Side Current-Sense Amplifier with Voltage OutputFeaturesThe MAX4372 low-cost, precision, high-side current-♦ Low-Cost, Compact Current-Sense Soluti ..
MAX818LCUA ,+5V Microprocessor Supervisory CircuitsGeneral Description ________
MAX818LEPA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818LESA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818MCSA ,+5V Microprocessor Supervisory CircuitsApplications TOP VIEWBattery-Powered Computers and ControllersEmbedded Controllers OUT 1 8 BATTInte ..
MAX818MCSA+ ,+5V Microprocessor Supervisory CircuitsApplicationsTOP VIEWBattery-Powered Computers and ControllersEmbedded ControllersOUT 1 8 BATTIntell ..
MAX818MCUA+ ,+5V Microprocessor Supervisory CircuitsELECTRICAL CHARACTERISTICS(V = +4.75V to +5.5V for MAX81_L, V = +4.5V to +5.5V for MAX81_M, V = 2.8 ..
MAX4372FESA+-MAX4372FEUK+-MAX4372FEUK+C3Z-MAX4372FEUK+T-MAX4372HEBT+T-MAX4372HEUK+T-MAX4372TEBT+T-MAX4372TESA+-MAX4372TEUK-MAX4372TEUK+-MAX4372TEUK+T
Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output
General DescriptionThe MAX4372 low-cost, precision, high-side current-
sense amplifier is available in a tiny, space-saving
SOT23 5-pin package. Offered in three gain versions
(T = 20V/V, F = 50V/V, and H = 100V/V), this device oper-
ates from a single 2.7V to 28V supply and consumes only 30μA. It features a voltage output that eliminates the need
for gain-setting resistors and is ideal for today’s notebook
computers, cell phones, and other systems where battery/
DC current monitoring is critical.
High-side current monitoring is especially useful in bat-
tery-powered systems since it does not interfere with the
ground path of the battery charger. The input common-
mode range of 0 to 28V is independent of the supply volt-
age and ensures that the current-sense feedback remains
viable even when connected to a 2-cell battery pack in
deep discharge.
The user can set the full-scale current reading by choos-
ing the device (T, F, or H) with the desired voltage gain
and selecting the appropriate external sense resistor.
This capability offers a high level of integration and flex-
ibility, resulting in a simple and compact current-sense
solution. For higher bandwidth applications, refer to the
MAX4173T/F/H data sheet.
Applications●Power-Management Systems●General-System/Board-Level Current Monitoring●Notebook Computers●Portable/Battery-Powered Systems●Smart-Battery Packs/Chargers●Cell Phones●Precision-Current Sources
Features●Low-Cost, Compact Current-Sense Solution●30μA Supply Current●2.7V to 28V Operating Supply●0.18% Full-Scale Accuracy●0.3mV Input Offset Voltage●Low 1.5Ω Output Impedance●Three Gain Versions Available 20V/V (MAX4372T) 50V/V (MAX4372F) 100V/V (MAX4372H)●High Accuracy +2V to +28V Common-Mode Range, Functional Down to 0V, Independent of Supply
Voltage●Available in a Space-Saving 5-Pin SOT23 Package
and 3 x 2 UCSP™ (1mm x 1.5mm) Package
Ordering Information appears at end of data sheet.UCSP is a trademark of Maxim Integrated Products, Inc.
Pin Configurations continued at end of datasheet.
+Denotes lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
*Note: Gain values are as follows: 20V/V for the T version,
50V/V for the F version, and 100V/V for the H version.
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Pin Conigurations
Typical Operating Circuit
Ordering Information
PARTTEMP
RANGEPIN-
PACKAGE
TOP
MARK
MAX4372TEUK+T-40°C to +85°C5 SOT23ADIU
MAX4372TESA+-40°C to +85°C8 SO—
MAX4372TEBT+T-40°C to +85°C3 x 2 UCSPACX
RS+5RS-
SOT23
UCSPTOP VIEWTOP VIEW
(BUMPS ON BOTTOM)4
OUT
OUT
VCC
VCC
GND
GND31RS+RS-
MAX4372T
MAX4372F
MAX4372HMAX4372T
MAX4372F
MAX4372HRS-
OUTA/D
CONVERTER
VCC
VCC
GND
RS+
RSENSEVSENSE
ILOAD
VIN
0 TO 28V
+2.7V TO +28V
0.1µF
MAX4372T
MAX4372F
MAX4372HLOAD/
BATTERY
VCC, RS+, RS- to GND .........................................-0.3V to +30V
OUT to GND ..........................................................-0.3V to +15VDifferential Input Voltage (VRS+ - VRS-) .............................±0.3V
Current into Any Pin .........................................................±10mA
Continuous Power Dissipation (TA = +70°C)5-Pin SOT23 (derate 3.9mW/°C above +70°C) .......312.6mW8-Pin SO (derate 7.4mW/°C above +70°C) ..............588.2mW3 x 2 UCSP (derate 3.4mW/°C above +70°C) .........273.2mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow) .......................................+260°C
(VRS+ = 0 to 28V, VCC = 2.7V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 1)
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Ampliier with Voltage Output
Absolute Maximum RatingsStresses 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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating Voltage Range
(Note 2)VCC2.728V
Common-Mode Input Range
(Note 3)VCMR028V
Common-Mode RejectionCMRVRS+ > 2V85dB
Supply CurrentICCVRS+ > 2V, VSENSE = 5mV3060μA
Leakage CurrentIRS+, IRS-VCC = 0V, VRS+ = 28V0.051.2μA
Input Bias Current
IRS+
VRS+ > 2V01
VRS+ ≤ 2V-25+2
IRS-
VRS+ > 2V02
VRS+ ≤ 2V-50+2
Full-Scale Sense Voltage
(Note 4)VSENSE
Gain = 20V/V or 50V/V150
Gain = 100V/V100
Input Offset Voltage
(Note 5)VOS
TA = +25°C
VCC = VRS+ = 12V
MAX4372_ESA0.3±0.8MAX4372_EUK, _EBT0.3±1.3
TA = TMIN to TMAX
VCC = VRS+ = 12V
MAX4372_ESA±1.1
MAX4372_EUK, _EBT±1.9
Full-Scale Accuracy
(Note 5)
VSENSE = 100mV, VCC = 12V,
VRS+ = 12V, TA = +25°C (Note 7)±0.18±3
Total OUT Voltage Error
(Note 6)
VSENSE = 100mV, VCC = 12V,
VRS+ = 12V (Note 7)±6
VSENSE = 100mV, VCC = 28V,
VRS+ = 28V (Note 7)±0.15±7
VSENSE = 100mV, VCC = 12V,
VRS+ = 0.1V (Note 7)±1±28
VSENSE = 6.25mV, VCC = 12V,
VRS+ = 12V (Note 8)±0.15
(VRS+ = 0 to 28V, VCC = 2.7V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are
at TA = +25°C.) (Note 1)
Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed by PSR test.
Note 3: Guaranteed by OUT voltage error test.
Note 4: Output voltage is internally clamped not to exceed 12V.
Note 5: VOS is extrapolated from the gain accuracy tests.
Note 6: Total OUT voltage error is the sum of gain and offset voltage errors.
Note 7: Measured at IOUT = -500μA (RLOAD = 4kΩ for gain = 20V/V, RLOAD = 10kΩ for gain = 50V/V, RLOAD = 20kΩ for gain = 100V/V).
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Ampliier with Voltage Output
Electrical Characteristics (continued)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOUT Low Voltage
(MAX4372T, MAX4372F)VOL
VCC = 2.7V,
VSENSE = -10mV,
VRS+ = 28V
IOUT = 10μA2.6IOUT = 100μA965
OUT Low Voltage
(MAX4372H)VOL
VCC = 2.7V,
VSENSE = -10mV,
VRS+ = 12V
IOUT = 10μA2.6IOUT = 100μA965
OUT High VoltageVCC - VOHVCC = 2.7V, IOUT = -500μA,
VSENSE = 250mV, VRS+ = 28V0.10.25V
-3dB BandwidthBW
VRS+ = 12V,
VCC = 12V,
CLOAD = 10pF
VSENSE = 20mV,
gain = 20V/V275
kHz
VSENSE = 20mV,
gain = 50V/V200
VSENSE = 20mV,
gain = 100V/V110
VSENSE = 6.25mV50
Gain
MAX4372T20
V/VMAX4372F50
MAX4372H100
Gain AccuracyVSENSE = 20mV
to 100mV, VRS+ = 12V
TA = +25°C±0.25±2.5TA = -40°C to +85°C±5.5
OUT Settling Time to 1% of
Final Value
Gain = 20V/V,
VCC = 12V,
VRS+ = 12V,
CLOAD = 10pF
VSENSE = 6.25mV to
100mV20VSENSE = 100mV to
6.25mV20
Capacitive-Load StabilityNo sustained oscillations1000pF
OUT Output ResistanceROUTVSENSE = 100mV1.5Ω
Power-Supply RejectionPSRVOUT = 2V, VRS+ > 2V7585dB
Power-Up Time to 1% of
Final Value
VCC = 12V, VRS+ = 12V,
VSENSE = 100mV, CLOAD = 10pF0.5ms
Saturation Recovery Time
(Note 9)VCC = 12V, VRS+ = 12V, CLOAD = 10pF0.1ms
(VCC = 12V, VRS+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise noted.)
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Ampliier with Voltage Output
Typical Operating CharacteristicsSUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX4372 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)121648202428
AV = +100V/V
AV = +50V/V
AV = +20V/V
VSENSE = 5mV
TOTAL OUTPUT ERROR
vs. SUPPLY VOLTAGE
MAX4372 toc04
SUPPLY VOLTAGE (V)
OUTPUT ERROR (%)
G = +100V/V
G = +50V/V
G = +20V/V
TOTAL OUTPUT ERROR
vs. COMMON-MODE VOLTAGE
MAX4372T toc07
OUTPUT ERROR (%)G = +100V/V
G = +20V/V
G = +50V/V
SUPPLY CURRENT vs. TEMPERATURE
MAX4372T toc02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
VSENSE = 5mV
TOTAL OUTPUT ERROR vs. VSENSE
MAX4372T toc05
VSENSE (mV)
OUTPUT ERROR (%)
AV = +100V/V
AV = +20V/V
AV = +50V/V
GAIN ACCURACY vs. TEMPERATURE
MAX4372T toc08
GAIN ACCURACY (%)
AV = +20V/V
AV = +50V/V
AV = +100V/V
SUPPLY CURRENT
vs. COMMON-MODE VOLTAGE
MAX4372 toc03
COMMON-MODE VOLTAGE (V)
SUPPLY CURRENT (µA)121648202428
AV = +100V/V
AV = +50V/V
AV = +20V/V
VSENSE = 5mV
100100k10k1k
POWER-SUPPLY REJECTION
vs. FREQUENCYMAX4372T toc06
FREQUENCY (Hz)
PSR (dB)
TOTAL OUTPUT ERROR vs. TEMPERATURE
MAX4372T toc09
TOTAL OUTPUT ERROR (%)
AV = +50V/V
AV = +100V/VAV = +20V/V
(VCC = 12V, VRS+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise noted.)
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Ampliier with Voltage Output
Typical Operating Characteristics (continued)VOUT
VSENSE
600mV
200mV
30mV
10mV
MAX4372T
SMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc10
20µs/div
VOUT
VSENSE
50mV
150mV
MAX4372T
LARGE-SIGNAL TRANSIENT RESPONSEMAX4372T toc13
20µs/div
VOUT
VSENSE
10V
100mV
MAX4372H
LARGE-SIGNAL TRANSIENT RESPONSE20µs/div
MAX4372T toc15
VOUT
VSENSE
2.5V
7.5V
50mV
150mV
MAX4372F
LARGE-SIGNAL TRANSIENT RESPONSE20µs/div
MAX4372T toc141k100k10k1M
SMALL-SIGNAL GAIN vs. FREQUENCYMAX4372T toc16
GAIN (dB)
G = 50V/V
G = 20V/V
G = 100V/V
VSENSE = 20mV
VOUT
VSENSE
1.5V
0.5V
30mV
10mV
MAX4372F
SMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc11
20µs/div
VOUT
VSENSE
30mV
10mV
MAX4372H
SMALL-SIGNAL TRANSIENT RESPONSEMAX4372T toc12
20µs/div
Detailed DescriptionThe MAX4372 high-side current-sense amplifier features
a 0 to 28V input common-mode range that is indepen-
dent of supply voltage. This feature allows the monitoring
of current flow out of a battery in deep discharge, and
also enables high-side current sensing at voltages far in
excess of the supply voltage (VCC).
Current flows through the sense resistor, generating a
sense voltage (Figure 1. Functional Diagram). Since
A1’s inverting input is high impedance, the voltage on
the negative terminal equals VIN - VSENSE. A1 forces its
positive terminal to match its negative terminal; therefore,
the voltage across RG1 (VIN - V1-) equals VSENSE. This
creates a current to flow through RG1 equal to VSENSE/
RG1. The transistor and current mirror amplify the current by a factor of β. This makes the current flowing out of the
current mirror equal to:
IM = β VSENSE/RG1
A2’s positive terminal presents high impedance, so this
current flows through RGD, with the following result:
V2+ = RGD β x VSENSE/RG1
R1 and R2 set the closed-loop gain for A2, which ampli-
fies V2+, yielding:
VOUT = RGD x β x VSENSE/RG1 (1 + R2/R1)
The gain of the device equals:
OUT
SEN
RGD x (1 + R2/R1)V/Rβ=
Applications Information
Recommended Component ValuesThe MAX4372 operates over a wide variety of current
ranges with different sense resistors. Table 1 lists com-
Choosing RSENSEGiven the gain and maximum load current, select RSENSE
such that VOUT does not exceed VCC - 0.25V or 10V. To
measure lower currents more accurately, use a high value
for RSENSE. A higher value develops a higher sense volt-
age, which overcomes offset voltage errors of the internal
current amplifier.
In applications monitoring very high current, ensure
RSENSE is able to dissipate its own I2R losses. If the
resistor’s rated 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
Figure 1. Functional Diagram
MAX4372T/F/HLow-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Ampliier with Voltage Output
Pin/Bump Description
PINBUMPNAMEFUNCTIONSOT23SOUCSP3A2GNDGround4A3OUTOutput Voltage. VOUT is proportional to the magnitude of VSENSE
(VRS+ - VRS-).1A1VCCSupply Voltage. Use at least a 0.1μF capacitor to decouple VCC from fast
transients.8B1RS+Power Connection to the External Sense Resistor6B3RS-Load-Side Connection to the External Sense Resistor2, 5, 7—N.C.No Connection. Not internally connected.
GND
LOAD
VIN
0 TO 28V
2.7V
28V
RGD
RG2
100kΩ
RS+
RS-
RG1
100kΩ
OUT
V2+
V1+
V1-
V2-
VCCRSENSE
ILOAD
VSENSE
CURRENT
MIRROR
MAX4372T
MAX4372F
MAX4372H
