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MAX471

Precision, High-Side Current-Sense Amplifiers

Maxim Integrated 

Precision, High-Side

Current-Sense Amplifiers

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-) ......................................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.

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 CHARACTERISTICS—MAX471

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

PARAMETER

SYMBOL

CONDITIONS

Supply Voltage

VRS+

Supply Current

IRS+ ILOAD = 0A, excludes ISIGN

Sense Current

ILOAD

Sense Resistor

Current-Sense Ratio

No-Load OUT Error

Low-Level OUT Error

RSENSE

IOUT/

ILOAD

ILOAD = 1A,

RS+ = 10V

ILOAD = 0A,

RS+ = 10V

ILOAD = 30mA,

RS+ = 10V

MAX471C

MAX471E

MAX471C

MAX471E

MAX471C

MAX471E

Power-Supply Rejection Ratio

PSRR 3V ≤ RS+ ≤ 36V, ILOAD = 1A

SIGN Threshold (ILOAD required

to switch SIGN)

MAX471C

MAX471E

SIGN Output Leakage Current

VSIGN = 36V

SIGN Sink Current

IOL

VSIGN = 0.3V

Shutdown Supply Current

IRS+(SHDN) VSHDN = 2.4V; VCC = 3V to 20V

SHDN Input Low Voltage

VIL

SHDN Input Low Current

IIL

VSHDN = 0V

SHDN Input High Voltage

VIH

SHDN Input High Current

IIH

VSHDN = 2.4V

OUT Output Voltage Range

VOUT

OUT Output Resistance

OUT Rise, Fall Time

OUT Settling Time to 1%

of Final Value

ROUT

tR, tF

ts

ILOAD = 3.0A, VOUT = 0V to (VRS+ - 1.5V)

ILOAD = 50mA to 3.0A, ROUT = 2kΩ,

COUT = 50pF, 10% to 90%

ILOAD = 100mA to 3.0A, ROUT = 2kΩ,

COUT = 50pF

MIN

3

0.490

0.4875

0.1

2.4

0

1

TYP

50

35

0.500

0.500

±4.0

MAX

36

113

±3

70

0.510

0.5125

2.5

3.0

±2.5

±3.0

0.1

±6.0

±7.0

1.0

1.5

18.0

0.3

1.0

1.0

VRS+ - 1.5

3

UNITS

V

µA

ARMS

mΩ

mA/A

µA

µA

%/V

mA

µA

mA

µA

V

µA

V

µA

V

MΩ

4

µs

15

µs

2 _______________________________________________________________________________________

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