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Part Number: MAX471CPA_1281651
Description: The MAX471/MAX472 are complete, bidirectional, high-side current-sense amplifiers for portable PCs, te...
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MAX471CPA_1281651
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DataSheet
General Description
MAX471CPA_1281651 General Description
The MAX471/MAX472 are complete, bidirectional, high-side current-sense amplifiers for portable PCs, tele- phones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered sys- tems, since it does not interfere with the ground paths of the battery chargers or monitors often found in "smart" batteries.
The MAX471 has an internal 35mΩ current-sense resis-tor and measures battery currents up to ±3A. For appli-cations requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-set-ting resistors. Both devices have a current output that can be converted to a ground-referred voltage with a single resistor, allowing a wide range of battery volt-ages and currents.
An open-collector SIGN output indicates current-flow direction, so the user can monitor whether a battery is being charged or discharged. Both devices operate from 3V to 36V, draw less than 100µA over tempera-ture, and include a 18µA max shutdown mode.
MAX471CPA_1281651 Maximum Ratings
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.
Supply Voltage, RS+, RS-, VCC to GND....................-0.3V, +40V
RMS Current, RS+ to RS- (MAX471 only) .........................±3.3A
Peak Current, (RS+ to RS-) .....................................see Figure 5
Differential Input Voltage, RG1 to RG2 (MAX472 only) .....±0.3V
Voltage 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 +40V
Current into SHDN, GND, OUT, RG1, RG2, VCC.............. ..±50mA
Current into SIGN................................................. +10mA, -50mA
Continuous Power Dissipation (TA = +70°C)
MAX471 (Note 1):
Plastic DIP (derate 17.5mW/°C above +70°C) ..................1.4W
SO (derate 9.9mW/°C above +70°C) .............................791mW
MAX472 :
Plastic DIP (derate 9.09mW/°C above +70°C) ............ ..727mW
SO (derate 5.88mW/°C above +70°C) ...........................471mW
Operating Temperature Ranges
MAX47_C_A...................................................... ..0°C to +70°C
MAX47_E_A.................................................. ...-40°C to +85°C
Junction Temperature Range ............................-60°C to +150°C
Storage Temperature Range ............................-60°C to +160°C
Lead 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+and RS- must be soldered to large copper traces to achieve this dissipation rating.
MAX471CPA_1281651 Features
· Complete High-Side Current Sensing
· Precision Internal Sense Resistor (MAX471)
· 2% Accuracy Over Temperature
· Monitors Both Charge and Discharge
· 3A Sense Capability with Internal Sense Resistor (MAX471)
· Higher Current-Sense Capability with External Sense Resistor (MAX472)
· 100µA Max Supply Current
· 18µA Max Shutdown Mode
· 3V to 36V Supply Operation
· 8-Pin DIP/SO Packages
MAX471CPA_1281651 Typical Application
Portable PCs:
Notebooks/Subnotebooks/Palmtops
Smart Battery Packs
Cellular Phones
Portable Phones
Portable Test/Measurement Systems
Battery-Operated Systems
Energy Management Systems
Notebooks/Subnotebooks/Palmtops
Smart Battery Packs
Cellular Phones
Portable Phones
Portable Test/Measurement Systems
Battery-Operated Systems
Energy Management Systems
MAX471CPA_1281651 Connection Diagram
MAX002
PDF/DataSheet Download
- Datasheet: MAX002
- File Size: 42133 KB
- Manufacturer: FILTRONIC [Filtronic Compound Semiconductors]
- Click here to Download
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