Maxim MAX4173TEUT-T, MAX4173HESA, MAX4173FESA, MAX4173TESA, MAX4173HEUT-T Datasheet

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General Description

The MAX4173 low-cost, precision, high-side current­sense amplifier is available in a tiny SOT23-6 package.
It features a voltage output that eliminates the need for
gain-setting resistors and it is ideal for today’s notebook
computers, cell phones, and other systems where cur­rent monitoring is critical. High-side current monitoring
is especially useful in battery-powered systems, since it
does not interfere with the ground path of the battery
charger. The input common-mode range of 0 to +28V is
independent of the supply voltage and ensures that the
current-sense feedback remains viable even when con­nected to a battery in deep discharge. The MAX4173’s
wide 1.7MHz bandwidth makes it suitable for use inside
battery charger control loops.

The combination of three gain versions and a user­selectable external sense resistor sets the full-scale
current reading. This feature offers a high level of inte­gration, resulting in a simple and compact current­sense solution.

The MAX4173 operates from a single +3V to +28V sup­ply, typically draws only 420µA of supply current over
the extended operating temperature range (-40°C to
+85°C), and is offered in the space-saving SOT23-6
package.

Applications

Notebook Computers
Portable/Battery-Powered Systems
Smart Battery Packs/Chargers
Cell Phones
Power-Management Systems
General System/Board-Level Current Monitoring
PA Bias Control
Precision Current Sources

Features

♦ Low-Cost, Compact Current-Sense Solution
♦ Wide 0 to +28V Common-Mode Range

Independent of Supply Voltage

♦ Three Gain Versions Available

+20V/V (MAX4173T)
+50V/V (MAX4173F)
+100V/V (MAX4173H)

♦ ±0.5% Full-Scale Accuracy
♦ 420µA Supply Current
♦ Wide 1.7MHz Bandwidth (MAX4173T)
♦ +3V to +28V Operating Supply
♦ Available in Space-Saving SOT23-6 Package

MAX4173T/F/H

Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier

________________________________________________________________

Maxim Integrated Products

1

MAX4173T/F/H

R

SENSE

0 TO +28V

I

LOAD

V

SENSE

V

CC

OUT

GND

RS+

+3V TO +28V

RS-

LOAD/

BATTERY

A/D

CONVERTER

0.1µF

Typical Operating Circuit

19-1434; Rev 1; 5/99

PART

MAX4173TEUT-T
MAX4173TESA

PIN-PACKAGE

6 SOT23-6
8 SO

Ordering Information

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE SOT TOP MARK

AABN

–
MAX4173FEUT-T -40°C to +85°C 6 SOT23-6 AABD
MAX4173FESA -40°C to +85°C 8 SO –
MAX4173HEUT-T -40°C to +85°C 6 SOT23-6 AABP
MAX4173HESA -40°C to +85°C 8 SO –

20

20

GAIN (V/V)

50

50
100
100

Pin Configurations appear at end of data sheet.

MAX4173T/F/H

Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

RS+

= 0 to +28V, V

CC

= +3V to +28V, V

SENSE

= 0, TA = T

MIN

to T

MAX

, R

LOAD

= ∞ unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

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.

VCC, RS+, RS- to GND.......................................... -0.3V to +30V

OUT to GND.............................................. -0.3V to (V

CC

+ 0.3V)

Output Short-Circuit to V

CC

or GND ......................... Continuous

Differential Input Voltage (V

RS+

- V

RS-

) ............................. ±0.3V

Current into Any Pin......................................................... ±20mA

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C)............... 471mW

SOT23-6 (derate 8.7mW/°C above +70°C)................. 696mW

Operating Temperature Range .......................... -40°C to +85°C

Storage Temperature Range............................ -65°C to +150°C

Lead Temperature (soldering, 10sec)............................ +300°C

V

RS+

> +2.0V

(Note 2)

Guaranteed by PSR test

V

SENSE

= +100mV, VCC= +12V, V

RS+

= +12V

V

SENSE

= V

RS+

- V

RS-

VCC= +12V, V

RS+

=+12V, V

SENSE

= +6.25mV

(Note 4)

V

SENSE

= +100mV, VCC= +12V, V

RS+

= +0.1V

V

RS+

≤ +2.0V

V

RS+

> +2.0V

V

RS+

> +2.0V, VCC= 12V
VCC= 0
V

RS+

> +2.0V

V

SENSE

= +100mV, VCC= +28V, V

RS+

= +28V

V

RS+

≤ +2.0V

V

SENSE

= +100mV, VCC= +12V, V

RS+

= +12V,

TA= +25°C

CONDITIONS

V

±7.5

-9 ±24

0.5 5.75

0.5 3.25

dB90CMRCommon-Mode Rejection

V028V

CMR

V328V

CC

Operating Voltage Range
Common-Mode Input Range

%

±0.5 5.75

mV150V

SENSE

Full-Scale Sense Voltage

-700 100

0 100

I

RS-

mA0.42 1.0I

CC

Supply Current

µA

0.3 3I

RS+

, I

RS-

Leakage Current

050

I

RS+

Input Bias Current

-350 50

UNITSMIN TYP MAXSYMBOLPARAMETER

Total OUT Voltage Error
(Note 3)

µA

MAX4173T, VCC= +3.0V

(VCC-

VOH)

OUT High Voltage
(Note 5)

0.8 1.2

MAX4173H, VCC= +15V 0.8 1.2

MAX4173F, VCC= +7.5V 0.8 1.2

MAX4173T/F/H

Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier

_______________________________________________________________________________________ 3

Note 1: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
Note 2: Guaranteed by Total Output Voltage Error Test.
Note 3: Total OUT Voltage Error is the sum of gain and offset voltage errors.
Note 4: +6.25mV = 1/16 of +100mV full-scale voltage.
Note 5: V

SENSE

such that output stage is in saturation.

Note 6: The device does not experience phase reversal when overdriven.

ELECTRICAL CHARACTERISTICS (continued)

(V

RS+

= 0 to +28V, V

CC

= +3V to +28V, V

SENSE

= 0, TA = T

MIN

to T

MAX

, R

LOAD

= ∞ unless otherwise noted. Typical values are at

T

A

= +25°C.) (Note 1)

MAX4173T, V

SENSE

= 80mV, V

RS+

≥ +2V

MAX4173T

V

SENSE

= +100mV to +6.25mV

MAX4173F,
V

SENSE

= +100mV,

MAX4173T,
V

SENSE

= +100mV,

TA= +25°C

MAX4173F
MAX4173H

TA= +25°C

dB

60 84

PSRPower-Supply Rejection

kΩ

12R

OUT

OUT Output Resistance

ns

800

OUT Settling Time to 1% of
Final Value

V/V

20

A

V

Gain

1.4
MHz

1.7

BWBandwidth

0.5 ±2.5

50

100

%

0.5 ±2.5

∆A

V

Gain Accuracy

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= +12V,
V

RS+

= +12V,

C

LOAD

= 5pF

V

RS+

= +12V,
VCC= +12V,
C

LOAD

= 5pF

MAX4173H
V

SENSE

= +10mV

to +100mV

MAX4173T/F
V

SENSE

= +10mV

to +150mV

CONDITIONS

MAX4173H,
V

SENSE

= +100mV,

1.2

V

SENSE

= +6.25mV,

(Note 4)

0.6

MAX4173F, V

SENSE

= 32mV, V

RS+

≥ +2V 60 91

MAX4173H, V

SENSE

= 16mV, V

RS+

≥ +2V 60 95

V

SENSE

= +100mV, C

LOAD

= 5pF µs10

Power-Up Time to 1% of Final
Value

VCC= +12V, V

RS+

= +12V (Note 6) µs10Saturation Recovery Time

4.0TA= -40°C to +85°C

4.0TA= -40°C to +85°C

400V

SENSE

= +6.25mV to +100mV

MAX4173T/F/H

Low-Cost, SOT23, Voltage-Output,
High-Side Current-Sense Amplifier

4 _______________________________________________________________________________________

370

390

380

410

400

430

420

440

010155 202530

SUPPLY CURRENT vs. SUPPLY VOLTAGE

MAX4173 TOC01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

MAX4173T

MAX4173F

MAX4173H

200

300
250

450
400
350

550
500

150

-50 -5 10-35 -20 25 40 55 70 85

SUPPLY CURRENT vs. TEMPERATURE

MAX4173 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

MAX4173T

MAX4173F

MAX4173H

0

0.4

0.2

0.8

0.6

1.2

1.0

1.4

0 1.0 1.50.5 2.0 2.5 28

SUPPLY CURRENT vs. RS+ VOLTAGE

MAX4173 toc03

V

RS+

(V)

SUPPLY CURRENT (mA)

MAX4173T

MAX4173H

MAX4173F

-0.60

-0.45

-0.30

-0.15

0

0.15

0.30

0.45

0.60

0105 15202530

TOTAL OUTPUT ERROR vs.

SUPPLY VOLTAGE

MAX4173 toc04

SUPPLY VOLTAGE (V)

TOTAL OUTPUT ERROR (%)

MAX4173F

V

SENSE

= 100mV

MAX4173T

MAX4173H

0

-100
100 1k 10k 100k 1M 10M

POWER-SUPPLY REJECTION

vs. FREQUENCY

-80

MAX4173 toc07

FREQUENCY (Hz)

PSR (dB)

-60

-40

-20

-10

-90

-70

-50

-30

-6

-2

-4

2

0

4

6

010155 202530

TOTAL OUTPUT ERROR

vs. SUPPLY VOLTAGE

MAX4173 toc05

SUPPLY VOLTAGE (V)

TOTAL OUTPUT ERROR (%)

MAX4173F

V

SENSE

= 6.25mV

MAX4173H

MAX4173T

-2

0

-1

2

1

3

4

0 10050 150 200

TOTAL OUTPUT ERROR vs.

FULL-SCALE SENSE VOLTAGE

MAX4173 toc06

V

SENSE

(mV)

TOTAL OUTPUT ERROR (%)

MAX4173F

V

CC

= 28V

MAX4173H

MAX4173T

-10

-8

-6

-4

-2

0

2

4

6

0105 15202530

TOTAL OUTPUT ERROR vs.
COMMON-MODE VOLTAGE

MAX4173 toc08

COMMON-MODE VOLTAGE (V)

TOTAL OUTPUT ERROR (%)

MAX4173F

MAX4173TMAX4173H

Typical Operating Characteristics

(VCC= +12V, V

RS+

= +12V, V

SENSE

= +100mV, TA= +25°C, unless otherwise noted.)

-1.2

-0.4

-0.8

0

0.4

0.8

1.2

-50 -20 -5 10-35 25 40 55 70 85

GAIN ACCURACY vs. TEMPERATURE

MAX4173 toc09

TEMPERATURE (°C)

GAIN ACCURACY (%)

MAX4173F

MAX4173H

MAX4173T