Maxim MAX4372TESA, MAX4372HEUK-T, MAX4372HESA, MAX4372FEUK-T, MAX4372FESA Datasheet

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General Description

The MAX4372 low-cost, precision, high-side current­sense amplifier is available in a tiny, space-saving
SOT23-5 package. Offered in three gain versions (T =
+20V/V, F = +50V/V, and H = +100V/V), this device
operates from a single +2.7V to +28V supply and con­sumes only 30µA. It features a voltage output that elimi­nates the need for gain-setting resistors and is ideal for
today’s notebook computers, cell phones, and other
systems where battery/DC 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 2­cell battery pack in deep discharge.

The user can set the full-scale current reading by
choosing the device (T, F, or H) with the desired volt­age gain and selecting the appropriate external sense
resistor. This capability offers a high level of integration
and flexibility, resulting in a simple and compact cur­rent-sense solution. For higher bandwidth applications,
refer to the MAX4173T/F/H data sheet.

Applications

Power-Management Systems

General-System/Board-Level Current Monitoring

Notebook Computers

Portable/Battery-Powered Systems

Smart-Battery Packs/Chargers

Cell Phones

Precision-Current Sources

Features

♦ Low-Cost, Compact Current-Sense Solution
♦ 30µA Supply Current
♦ +2.7V to +28V Operating Supply
♦ 0.18% Full-Scale Accuracy
♦ Low 1.5Ω Output Impedance
♦ Three Gain Versions Available

+20V/V (MAX4372T)
+50V/V (MAX4372F)
+100V/V (MAX4372H)

♦ Wide 0 to +28V Common-Mode Range,

Independent of Supply Voltage

♦ Available in Space-Saving SOT23-5 Package

MAX4372T/F/H

Low-Cost, SOT23, Micropower, High-Side

Current-Sense Amplifier with Voltage Output

________________________________________________________________

Maxim Integrated Products

1

19-1548; Rev 0; 10/99

PART

MAX4372TEUK-T

MAX4372TESA

MAX4372FEUK-T -40°C to +85°C

-40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

5 SOT23-5

8 SO

5 SOT23-5

Pin Configurations

Ordering Information

TOP

MARK

ADIU

—

ADIV

MAX4372FESA

MAX4372HEUK-T

MAX4372HESA -40°C to +85°C

-40°C to +85°C

-40°C to +85°C 8 SO

5 SOT23-5

8 SO

—

ADIW

—

RS-

OUT

A/D

CONVERTER

V

CC

V

CC

GND

RS+

R

SENSEVSENSE

I

LOAD

V

IN

0 TO 28V

+2.7V TO +28V

0.1µF

MAX4372T/F/H

LOAD/

BATTERY

Typical Operating Circuit

Note: Gain values are as follows: +20V/V for the T version,
+50V/V for the F version, and +100V/V for the H version.

TOP VIEW

GND

15RS-

MAX4372T/F/H

OUT

2

V

CC

34

SOT23-5

RS+

GND

V

CC

1

2

MAX4372T/F/H

3

4

SO

87RS+

N.C.N.C.

RS-

6

N.C.OUT

5

MAX4372T/F/H

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

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

RS+

= 0 to +28V, VCC= +2.7V to +28V, V

SENSE

= 0, R

LOAD

= 1MΩ, T

A

= T

MIN

to T

MAX

, 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 +15V

Differential Input Voltage (V

RS+

- V

RS-

) ..............................±0.3V

Current into Any Pin..........................................................±10mA

Continuous Power Dissipation (T

A

= +70°C)

5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW

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

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

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

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

VCC= 2.7V, I

OUT

= -500µA

VCC= 2.7V

V

RS+

≤ 2V

V

RS+

> 2V

V

RS+

≤ 2V

V

RS+

> 2V

V

RS+

> 2V

V

RS+

> 2V, V

SENSE

= 5mV

Gain = +100V/V

VCC= 0

Gain = +20V/V or +50V/V

CONDITIONS

V0.1 0.25VCC- V

OH

OUT High Voltage

965

OUT Low Voltage mV

2.6

mV

100

V

SENSE

150

Full-Scale Sense Voltage
(Note 4)

V028V

CMR

Common-Mode Input Range
(Note 3)

V2.7 28V

CC

Operating Voltage Range
(Note 2)

µA

-50 2

I

RS-

Input Bias Current

02

-25 2

I

RS+

01

dB85CMRCommon-Mode Rejection

µA30 60I

CC

Supply Current

µA0.05 1.2I

RS+

, I

RS-

Leakage Current

UNITSMIN TYP MAXSYMBOLPARAMETER

I

OUT

= 10µA

I

OUT

= 100µA

V

SENSE

= 100mV, VCC= 12V,

V

RS+

= 12V, TA= +25°C (Note 6)

%±0.18 ±3

Full-Scale Accuracy
(Note 5)

V

SENSE

= 100mV, VCC= 12V,

V

RS+

= 12V (Note 6)

±6

V

SENSE

= 100mV, VCC= 28V,

V

RS+

= 28V (Note 6)

±0.15 ±7

V

SENSE

= 100mV, VCC= 12V,

V

RS+

= 0.1V (Note 6)

±1 ±28

V

SENSE

= 6.25mV, VCC= 12V,

V

RS+

= 12V (Note 7)

%

±0.15

Total OUT Voltage Error
(Note 5)

MAX4372T/F/H

Low-Cost, SOT23, Micropower, High-Side

Current-Sense Amplifier with Voltage Output

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(V

RS+

= 0 to +28V, VCC= +2.7V to +28V, V

SENSE

= 0, R

LOAD

= 1MΩ, T

A

= T

MIN

to T

MAX

, unless otherwise noted. Typical values are

at T

A

= +25°C.) (Note 1)

Note 1: All devices are 100% production tested at T

A

= +25°C. All temperature limits are guaranteed by design.

Note 2: Guaranteed by PSR test.
Note 3: Guaranteed by OUT Voltage Error test.
Note 4: Output voltage is internally clamped not to exceed 12V.
Note 5: Total OUT voltage error is the sum of gain and offset voltage errors.
Note 6: Measured at I

OUT

= -500µA (R

LOAD

= 4kΩ for gain = +20V/V, R

LOAD

= 10kΩ for gain = +50V/V, R

LOAD

= 20kΩ for gain =

+100V/V).

Note 7: +6.25mV = 1/16 of +100mV full-scale voltage (C/16).
Note 8: The device will not reverse phase when overdriven.

V

RS

+

= 12V,

V

CC

= 12V,

C

LOAD

= 10pF

CONDITIONS

MAX4372T 20

V

SENS

E

= 100mV,

gain = +20V/V

kHz

50

BW

275

UNITSMIN TYP MAXSYMBOLPARAMETER

V

SENSE

= 100mV,

gain = +50V/V

200

V

SENSE

= 100mV,

gain = +100V/V

110

-3dB Bandwidth

MAX4372F

MAX4372H

V/V

100

Gain 50

No sustained oscillations

V

SENSE

= 100mV Ω1.5R

OUT

OUT Output Resistance

pF1000Capacitive Load Stability

V

SENSE

= 20mV

to 100mV

%

±5.5

Gain Accuracy

V

OUT

= 2V, V

RS+

> 2V

VCC= 12V, V

RS+

= 12V, C

LOAD

= 10pF ms0.1

Saturation Recovery Time
(Note 8)

VCC= 12V, V

RS+

= 12V,

V

SENSE

= 100mV, C

LOAD

= 10pF

ms0.5

Power-Up Time to 1% of
Final Value

dB75 85PSRPower-Supply Rejection

V

SENSE

= 6.25mV

±0.25 ±2.5TA= +25°C

TA= -40°C to +85°C

V

SENSE

= 6.25mV to

100mV

20

V

SENSE

= 100mV to

6.25mV

Gain = +20V/V,
VCC= 12V,
V

RS+

= 12V,

C

LOAD

= 10pF

µs

20

OUT Settling Time to 1% of
Final Value