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 ..
MAX4372TESA+ ,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 ..
MAX4372TEUK ,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
MAX4372TEUK+ ,Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Outputapplications, refer to the MAX4372TEUK+T -40°C to +85°C 5 SOT23 ADIUMAX4173T/F/H data sheet.MAX4372 ..
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 ..
MAX818MEPA ,+5V Microprocessor Supervisory CircuitsMAX817L/M, MAX818L/M, MAX819L/M*19-0494; Rev 1; 3/96+5V Microprocessor Supervisory Circuits________ ..
MAX818MEPA+ ,+5V Microprocessor Supervisory CircuitsFeaturesThe MAX817/MAX818/MAX819 microprocessor (µP) ♦ Precision Supply-Voltage Monitor:supervisory ..
MAX4372FEUK-T-MAX4372HEUK-T-MAX4372TESA-MAX4372TEUK-T
Low-Cost / 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 package. Offered in three gain versions (T =
+20V/V, F = +50V/V, and H = +100V/V), this device
operates from a single +2.7V to +28V supply and con-
sumes only 30μA. It features a voltage output that elimi-
nates 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 com-
mon-mode range of 0 to +28V is independent of the
supply voltage 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
choosing the device (T, F, or H) with the desired volt-
age gain and selecting the appropriate external sense
resistor. This capability offers a high level of integration
and flexibility, resulting in a simple and compact cur-
rent-sense solution. For higher bandwidth applications,
refer to the MAX4173T/F/H data sheet.
ApplicationsPower-Management Systems
General-System/Board-Level Current Monitoring
Notebook Computers
Portable/Battery-Powered Systems
Smart-Battery Packs/Chargers
Cell Phones
Precision-Current Sources
FeaturesLow-Cost, Compact Current-Sense Solution 30μA Supply Current +2.7V to +28V Operating Supply0.18% Full-Scale AccuracyLow 1.5ΩOutput ImpedanceThree Gain Versions Available
+20V/V (MAX4372T)
+50V/V (MAX4372F)
+100V/V (MAX4372H)Wide 0 to +28V Common-Mode Range,
Independent of Supply VoltageAvailable in Space-Saving SOT23-5 Package
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output19-1548; Rev 0; 10/99
Pin Configurations
Ordering Informationypical Operating Circuit
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/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VRS+= 0 to +28V, VCC= +2.7V to +28V, VSENSE= 0, RLOAD= 1MΩ, TA = TMINto TMAX, unless otherwise noted. Typical values are
at TA= +25°C.) (Note 1)
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.
VCC, RS+, RS- to GND...........................................-0.3V to +30V
OUT to GND...........................................................-0.3V to +15V
Differential Input Voltage (VRS+- VRS-)..............................±0.3V
Current into Any Pin..........................................................±10mA
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
8-Pin SO (derate 5.88mW/°C above +70°C).................471mW
Operating Temperature Range...........................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
ELECTRICAL CHARACTERISTICS (continued)(VRS+= 0 to +28V, VCC= +2.7V to +28V, VSENSE= 0, RLOAD= 1MΩ, TA = TMINto 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:Total OUT voltage error is the sum of gain and offset voltage errors.
Note 6:Measured at IOUT= -500μA (RLOAD= 4kΩfor gain = +20V/V, RLOAD= 10kΩfor gain = +50V/V, RLOAD= 20kΩfor gain =
+100V/V).
Note 7:+6.25mV = 1/16 of +100mV full-scale voltage (C/16).
Note 8:The device will not reverse phase when overdriven.
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Typical Operating Characteristics(VCC= +12V, VRS+= 12V, VSENSE= 100mV, TA = +25°C, unless otherwise noted.)
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Outputypical Operating Characteristics (continued)(VCC= +12V, VRS+= 12V, VSENSE= 100mV, TA = +25°C, unless otherwise noted.)
_______________Detailed DescriptionThe MAX4372 high-side current-sense amplifier fea-
tures a 0 to +28V input common-mode range that is
independent of supply voltage. This feature allows the
monitoring of current flow out of a battery in deep dis-
charge, 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). 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 RG1equal to VSENSE/ RG1. The
transistor and current mirror amplify the current by a
factor of b. This makes the current flowing out of the
current mirror equal to:= bVSENSE/ RG1
A2’s positive terminal presents high impedance, so this
current flows through RGD, with the following result:
V2+= RGDb
·VSENSE/ RG1
R1 and R2 set the closed-loop gain for A2, which
amplifies V2+, yielding:
VOUT= RGD
·b
·VSENSE/ RG1(1 + R2 / R1)
The gain of the device equals:
VOUT= RGD
·b(1 + R2 / R1) / RG1VSENSE
__________Applications Information
Recommended Component ValuesThe MAX4372 operates over a wide variety of current
ranges with different sense resistors. Table 1 lists com-
mon resistor values for typical operation of the
MAX4372.
Choosing RSENSEGiven the gain and maximum load current, select
RSENSEsuch that VCC- VOUTdoes not exceed +0.25V
and VOUTdoes not exceed +10V. To measure lower
currents more accurately, use a high value for RSENSE.
A higher value develops a higher sense voltage, which
overcomes offset voltage errors of the internal current
amplifier.
In applications monitoring very high current, ensure
RSENSEis 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
maximum ratings.
MAX4372T/F/H
Low-Cost, SOT23, Micropower, High-Side
Current-Sense Amplifier with Voltage Output
Pin Description
