MAX472CSA+中文资料

时间：2026-01-23

Not Recommended for New Designs

This product was manufactured for Maxim by an outside wafer foundry using a process that is no longer available. It is not recommended for new designs. The data sheet remains available for existing users. A Maxim replacement or an industry second-source may be available. Please see the QuickView data sheet for this part or contact technical support for assistance.

For further information, .

19-0335; Rev 2; 12/96

Precision, High-Side Current-Sense Amplifiers

_______________General Description

____________________________Features

The MAX471/MAX472 are complete, bidirectional, high-side current-sense amplifiers for portable PCs, tele-oComplete High-Side Current Sensingphones, and other systems where battery/DCoPrecision Internal Sense Resistor (MAX471)power-line monitoring is critical. High-side power-linemonitoring is especially useful in battery-powered sys-o2% Accuracy Over Temperaturetems, since it does not interfere with the ground pathsoMonitors Both Charge and Discharge

of the battery chargers or monitors often found in“smart” batteries.

o3A Sense Capability with Internal Sense ResistorThe MAX471 has an internal 35m current-sense resis-(MAX471)tor and measures battery currents up to ±3A. For appli-oHigher Current-Sense Capability with Externalcations requiring higher current or increased flexibility,Sense Resistor (MAX472)the MAX472 functions with external sense and gain-set-ting resistors. Both devices have a current output thato100µA Max Supply Currentcan be converted to a ground-referred voltage with ao18µA Max Shutdown Modesingle resistor, allowing a wide range of battery volt-ages and currents.

o3V to 36V Supply OperationAn open-collector SIGN output indicates current-flowo8-Pin DIP/SO Packages

direction, so the user can monitor whether a battery isbeing charged or discharged. Both devices operatefrom 3V to 36V, draw less than 100µA over tempera-______________Ordering Information

ture, and include a 18µA max shutdown mode.

________________________Applications

Portable PCs:

Notebooks/Subnotebooks/PalmtopsSmart Battery PacksCellular PhonesPortable Phones

Portable Test/Measurement SystemsBattery-Operated SystemsEnergy Management Systems

__________Typical Operating Circuit

_________________Pin Configurations

________________________________________________________________Maxim Integrated Products

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MAX471/MAX472

Precision, High-Side

Current-Sense Amplifiers

MAX471/MAX472

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, RS+, RS-, VCCto GND....................-0.3V, +40VRMS Current, RS+ to RS- (MAX471 only)..........................±3.3APeak Current, (RS+ to RS-)......................................see Figure 5Differential Input Voltage, RG1 to RG2 (MAX472 only) .....±0.3VVoltage at Any Pin Except SIGN

MAX471 only...........................................-0.3V to (RS+ - 0.3V)MAX472 only..........................................-0.3V to (VCC+ 0.3V)Voltage at SIGN......................................................-0.3V to +40VCurrent into SHDN, GND, OUT, RG1, RG2, VCC................±50mACurrent into SIGN.................................................+10mA, -50mA

Continuous Power Dissipation (TA= +70°C)MAX471 (Note 1):

Plastic DIP (derate 17.5mW/°C above +70°C)..................1.4WSO (derate 9.9mW/°C above +70°C).............................791mWMAX472 :

Plastic DIP (derate 9.09mW/°C above +70°C)..............727mWSO (derate 5.88mW/°C above +70°C)...........................471mWOperating Temperature Ranges

MAX47_C_A........................................................0°C to +70°CMAX47_E_A.....................................................-40°C to +85°CJunction Temperature Range............................-60°C to +150°CStorage Temperature Range.............................-60°C to +160°CLead Temperature (soldering, 10sec).............................+300°C

Note 1:Due to special packaging considerations, MAX471 (DIP, SO) has a higher power dissipation rating than the MAX472. RS+

andRS- must be soldered to large copper traces to achieve this dissipation rating.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functionaloperation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure toabsolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS—MAX471

(RS+ = +3V to +36V, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)

Precision, High-Side Current-Sense Amplifiers

ELECTRICAL CHARACTERISTICS—MAX472

(VCC= +3V to +36V, RG1 = RG2 = 200 , TA= TMINto TMAX, unless otherwise noted. Typical values are at TA = +25°C.)

Note 2:VOSis defined as the input voltage (VSENSE) required to give minimum IOUT.Note 3:VSENSEis the voltage across the sense resistor.

_______________________________________________________________________________________3

MAX471/MAX472

Precision, High-Side

Current-Sense AmplifiersMAX471/MAX472

__________________________________________Typical Operating Characteristics

(Typical Operating Circuit (MAX471) or circuit of Figure 4, RG1 = RG2 = 200 , ROUT= 2k (MAX472), TA= +25°C, unless otherwise noted.)