MAX471CPA+

MAX471CPA+ Datasheet

MAX471/MAX472

Part	Datasheet
MAX471CPA+	MAX471CPA+ (pdf)

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MAX471/MAX472 Precision, High-Side Current-Sense Amplifiers The MAX471/MAX472 are complete, bidirectional, highside current-sense amplifiers for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, 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 current-sense resistor and measures battery currents up to ±3A. For applications requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-setting 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 voltages 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 temperature, and include a 18µA max shutdown mode. Portable PCs Notebooks/Subnotebooks/Palmtops Smart Battery Packs Cellular Phones Portable Phones Portable Test/Measurement Systems Battery-Operated Systems Energy Management Systems Operating Circuit o Complete High-Side Current Sensing o Precision Internal Sense Resistor MAX471 o 2% Accuracy Over Temperature o Monitors Both Charge and Discharge o 3A Sense Capability with Internal Sense Resistor MAX471 o Higher Current-Sense Capability with External Sense Resistor MAX472 o 100µA Max Supply Current o 18µA Max Shutdown Mode o 3V to 36V Supply Operation o 8-Pin DIP/SO Packages Ordering Information PART MAX471CPA MAX471CSA MAX471EPA MAX471ESA MAX472CPA MAX472CSA MAX472EPA MAX472ESA TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C PIN-PACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO Configurations 100k 3V TO MAX471 SIGN SHDN GND OUT ILOAD 2000 ILOAD TO LOAD or CHARGER LOGIC SUPPLY DISCHARGE/CHARGE VOUT 1V/A TOP VIEW SHDN 1 RS+ 2 RS+ 3 GND 4 MAX471 DIP/SO 8 OUT 7 RS6 RS5 SIGN MAX472 Pin Configuration continued on last page. Maxim Integrated Products 1 For free samples & the latest literature or phone 1-800-998-8800 Precision, High-Side Current-Sense Amplifiers MAX471/MAX472 ABSOLUTE MAXIMUM RATINGS Supply Voltage, RS+, RS-, VCC to GND....................-0.3V, +40V RMS Current, RS+ to RS- MAX471 only ..........................±3.3A Peak Current, RS+ to RS- Figure 5 Differential Input Voltage, RG1 to RG2 MAX472 only .....±0.3V Voltage at Any Pin Except SIGN MAX471 only to RS+ - 0.3V MAX472 only to VCC + 0.3V Voltage at to +40V Current into SHDN, GND, OUT, RG1, RG2, VCC................±50mA Current into -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 to +70°C MAX47_E_A 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. 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. ELECTRICAL RS+ = +3V to +36V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. PARAMETER CONDITIONS Supply Voltage VRS+ Supply Current IRS+ ILOAD = 0A, excludes ISIGN Sense Current ILOAD

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MAX471/MAX472

Precision, High-Side Current-Sense Amplifiers

The MAX471/MAX472 are complete, bidirectional, highside current-sense amplifiers for portable PCs, telephones, and other systems where battery/DC power-line monitoring is critical. High-side power-line monitoring is especially useful in battery-powered systems, 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 current-sense resistor and measures battery currents up to ±3A. For applications requiring higher current or increased flexibility, the MAX472 functions with external sense and gain-setting 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 voltages 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 temperature, and include a 18µA max shutdown mode.

Portable PCs Notebooks/Subnotebooks/Palmtops

Smart Battery Packs

Cellular Phones

Portable Phones

Portable Test/Measurement Systems

Battery-Operated Systems

Energy Management Systems

Operating Circuit
o Complete High-Side Current Sensing o Precision Internal Sense Resistor MAX471 o 2% Accuracy Over Temperature o Monitors Both Charge and Discharge o 3A Sense Capability with Internal Sense Resistor

MAX471 o Higher Current-Sense Capability with External

Sense Resistor MAX472 o 100µA Max Supply Current o 18µA Max Shutdown Mode o 3V to 36V Supply Operation o 8-Pin DIP/SO Packages
Ordering Information

PART MAX471CPA MAX471CSA MAX471EPA MAX471ESA MAX472CPA MAX472CSA MAX472EPA MAX472ESA

TEMP. RANGE 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C

PIN-PACKAGE 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO 8 Plastic DIP 8 SO

Configurations
100k
3V TO

MAX471

SIGN

SHDN GND

OUT ILOAD
2000

ILOAD TO LOAD or CHARGER LOGIC SUPPLY

DISCHARGE/CHARGE VOUT 1V/A

TOP VIEW

SHDN 1 RS+ 2 RS+ 3 GND 4

MAX471 DIP/SO
8 OUT 7 RS6 RS5 SIGN

MAX472 Pin Configuration continued on last page.

Maxim Integrated Products 1

For free samples & the latest literature or phone 1-800-998-8800

Precision, High-Side Current-Sense Amplifiers

MAX471/MAX472

ABSOLUTE MAXIMUM RATINGS

Supply Voltage, RS+, RS-, VCC to GND....................-0.3V, +40V RMS Current, RS+ to RS- MAX471 only ..........................±3.3A Peak Current, RS+ to RS- Figure 5 Differential Input Voltage, RG1 to RG2 MAX472 only .....±0.3V Voltage at Any Pin Except SIGN

MAX471 only to RS+ - 0.3V MAX472 only to VCC + 0.3V Voltage at to +40V Current into SHDN, GND, OUT, RG1, RG2, VCC................±50mA Current into -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 to +70°C MAX47_E_A 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.

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.

ELECTRICAL

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

PARAMETER

CONDITIONS

Supply Voltage

VRS+

Supply Current

IRS+ ILOAD = 0A, excludes ISIGN

Sense Current

ILOAD

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Datasheet ID: MAX471CPA+ 647353