MAX4173TESA datasheet(8/10 Pages) MAXIM

Part #	MAX4173TESA

Description	Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier 420μA of supply current

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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8 / 10 page

Low-Cost, SOT23, Voltage-Output,

High-Side Current-Sense Amplifier

8

_______________________________________________________________________________________

amp’s supply voltage range should be at least as high

as any voltage the system may encounter.

The percent error introduced by output loading is

determined with the following formula:

where RLOAD is the external load applied to OUT.

Current Source Circuit

Figure 3 shows a block diagram using the MAX4173

with a switching regulator to make a current source.

%

100

R

12k

R

1

ERROR

LOAD

=

Ω+

−

⎛

⎝

⎜

⎞

⎠

⎟

Table 1. Recommended Component Values

MAX4173T

VSENSE

RSENSE

+3V TO +28V

0.1

µF

RS+

+

0.3 in. COPPER

INPUT

LOAD/BATTERY

0.3 in. COPPER

0.1 in. COPPER

RS-

GND

OUT

VCC

_

Figure 2. MAX4173 Connections Showing Use of PC Board

Figure 3. Current Source

MAX4173

RSENSE

ILOAD

0 TO +28V

VSENSE

VCC

OUT

VIN

GND

RS+

+3V TO +28V

0.1

µF

RS-

LOAD/

BATTERY

LOW-COST

SWITCHING

REGULATOR

10.0

100

5.0

50

2.0

10

20

10.0

100

5.0

50

2.0

5

20

10.0

100

5.0

50

2.0

1

100

20

10.0

100

5.0

50

1000

CURRENT-SENSE RESISTOR

RSENSE (m

Ω

Ω)

20

GAIN

2.0

0.1

FULL-SCALE OUTPUT VOLTAGE

(FULL-SCALE VSENSE = 100mV)

VOUT (V)

FULL-SCALE LOAD CURRENT

ILOAD (A)

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