MAX472EPA datasheet(2/12 Pages) MAXIM

2 / 12 page

Precision, High-Side

Current-Sense Amplifiers

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX471

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

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

VSHDN = 2.4V

ILOAD = 0A, excludes ISIGN

VSHDN = 0V

VSHDN = 2.4V; VCC = 3V to 20V

VSIGN = 0.3V

VSIGN = 36V

ILOAD = 30mA,

RS+ = 10V

MAX471E

MAX471C

ILOAD = 0A,

RS+ = 10V

ILOAD = 1A,

RS+ = 10V

≤ RS+ ≤ 36V, ILOAD = 1A

CONDITIONS

0VRS+ - 1.5

VOUT

OUT Output Voltage Range

µA

1.0

IIH

SHDN Input High Current

2.4

VIH

SHDN Input High Voltage

µA

1.0

IIL

SHDN Input Low Current

0.3

VIL

SHDN Input Low Voltage

µA

1.5

18.0

IRS+(SHDN)

Shutdown Supply Current

0.1

IOL

SIGN Sink Current

µA

1.0

SIGN Output Leakage Current

±4.0

±6.0

SIGN Threshold (ILOAD required

to switch SIGN)

%/V

0.1

PSRR

Power-Supply Rejection Ratio

ARMS

±3

ILOAD

Sense Current

113

IRS+

336

VRS+

Supply Voltage

Supply Current

µA

±3.0

Low-Level OUT Error

±2.5

µA

3.0

No-Load OUT Error

Ω

RSENSE

Sense Resistor

0.490

0.500

0.510

mA/A

0.4875

0.500

0.5125

IOUT/

ILOAD

Current-Sense Ratio

2.5

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

OUT Output Resistance

ROUT

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

Ω

OUT Rise, Fall Time

tR, tF

ILOAD = 50mA to 3.0A, ROUT = 2kΩ,

COUT = 50pF, 10% to 90%

µs

OUT Settling Time to 1%

of Final Value

ILOAD = 100mA to 3.0A, ROUT = 2kΩ,

COUT = 50pF

µs

MAX471C

MAX471E

±7.0

µA

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.

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