Maxim MAX4375TEUB, MAX4375TESD, MAX4375HEUB, MAX4375FESD, MAX4374TEUB Datasheet

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General Description

The MAX4373/MAX4374/MAX4375 low-cost, micropow­er, high-side current-sense supervisors contain a high­side current-sense amplifier, bandgap reference, and
comparator with latching output. They feature a voltage
output that eliminates the need for gain-setting resistors,
making them 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 0 to +28V input common-mode range is
independent of the supply voltage, which ensures that
the current-sense feedback remains viable even when
connected to a battery pack in deep discharge.

The comparator output of the MAX4373/MAX4374/
MAX4375 is latched to provide a turn-off flag that
doesn’t oscillate. In addition, the MAX4374/MAX4375
contain a second comparator for use in window-detec­tion functions. The MAX4373/MAX4374/MAX4375 are
available in three different gain versions (T = +20V/V,
F = +50V/V, H = +100V/V) and use an external sense
resistor to set the sensitivity of the input voltage to the
load current. These features offer a high level of inte­gration, resulting in a simple and compact current­sense solution.

The MAX4373/MAX4374/MAX4375 operate from a sin­gle +2.7V to +28V supply and consume 50µA. They are
specified for the extended operating temperature range
(-40°C to +85°C) and are available in 8-pin and 10-pin
µMAX packages.

________________________Applications

Notebook Computers

Portable/Battery-Powered Systems

Smart Battery Packs/Chargers

Cell Phones

Power-Management Systems

General-System/Board-Level Current Monitoring

Precision Current Sources

Features

♦ Current-Sense Amplifier plus Internal Comparator

and Bandgap Reference

♦ 50µA Supply Current

♦ Single +2.7V to +28V Operating Supply

♦ 0.66% Full-Scale Accuracy

♦ Internal Bandgap Reference

♦ Latching Comparator Output

♦ Three Gain Versions Available (+20V/V, +50V/V,

+100V/V)

♦ Wide 0 to +28V Common-Mode Range,

Independent of Supply Voltage

MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side Current-Sense

Amplifier + Comparator + Reference ICs

________________________________________________________________ Maxim Integrated Products 1

Typical Operating Circuit

19-1630; Rev 0; 3/00

Pin Configurations appear at end of data sheet.

8 SO

8 µMAX

PIN-

PACKAGE

TEMP. RANGE

-40°C to +85°C

-40°C to +85°CMAX4373TESA

MAX4373TEUA

PART

+20

+20

GAIN
(V/V)

8 µMAX-40°C to +85°CMAX4373FEUA +50
8 SO-40°C to +85°CMAX4373FESA +50
8 µMAX-40°C to +85°CMAX4373HEUA +100
8 SO-40°C to +85°CMAX4373HESA +100

Ordering Information continues at end of data sheet.

Ordering Information

+ V

V

CC

COUT

RESET

SENSE

R

SENSE

MAX4373

GND

VIN = 0 TO 28V

VCC = 2.7V TO 28V

0.1µF

V

= 5V

PULL-UP

C1

R3

I

LOAD

-

RS-RS+

OUT

CIN

LOAD/

BATTERY

R1

R2

MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

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

RS+

= 0 to +28V, V

SENSE

= 0, V

RESET

= 0, R

LOAD

= 1MΩ, TA= 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 the lesser of

(V

CC

+ 0.3V) or +15V

CIN1, CIN2, RESET to GND ........................-0.3V to the lesser of

(V

CC

+ 0.3V) or +12V

Differential Input Voltage (V

RS

+ - VRS-)..............................±0.3V

COUT1, COUT2 to GND........................................-0.3V to +6.0V

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

Continuous Power Dissipation (T

A

= +70°C)

8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW

8-Pin SO (derate 5.9mW/°C above +70°C)..................471mW

10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW

14-Pin SO (derate 8.3mW/°C above +70°C)................667mW

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

Junction Temperature......................................................+150°C

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

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

%

Total OUT Voltage Error
(Note 5)

V

SENSE

= 100mV

(Note 6)

V

SENSE

= 6.25mV, VCC= 12V, V

RS+

= 12V

(Note 7)

VCC= 12V,
V

RS+

= 0.1V

VCC= 28V, V

RS+

= 28V,

TA= T

MIN

to T

MAX

VCC= 12V, V

RS+

= 12V,

TA= T

MIN

to T

MAX

%

8.5 65I

OUT

= 100µA

I

OUT

= 10µA

±7.5

±0.55 ±7.5

±5.0

±5.0

PARAMETER SYMBOL MIN TYP MAX UNITS

-25 2.0

Input Bias Current

I

RS+

0 2.5

µA

Leakage Current I

RS+, IRS-

±0.015 ±0.5 µA

Supply Current I

CC

50 100 µA

I

RS-

04

-50 4

Full-Scale Sense Voltage
(Note 4)

V

SENSE

150 170

mV

100 120

Common-Mode Input Range
(Note 3)

Operating Voltage Range
(Note 2)

V

CC

2.7 28 V

V

CMR

028V

Common-Mode Rejection CMR 85 dB

OUT Voltage Low V

OUT

2.5
mV

OUT Voltage High

V

CC -

V

OH

0.25 V

CONDITIONS

V

RS+

≤ 2V

VCC= 2.7V

V

RS+

> 2V

V

CC

= 0

V

RS+

> 2V, V

SENSE

= 5mV

V

RS+

> 2V

V

RS+

≤ 2V

VCC= 2.7V, I

OUT

= -500µA

Gain = +20V/V, +50V/V

Gain = +100V/V

V

RS+

> 2V

Full-Scale Accuracy
(Note 5)

V

SENSE

= 100mV, VCC= 12V, V

RS+

= 12V,

TA= +25°C

±0.66 ±5.5

MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side Current-Sense

Amplifier + Comparator + Reference ICs

_______________________________________________________________________________________ 3

V

SENSE

=
20mV to 150mV;
V

CC

= 12V; V

RS+

= 12V;

Gain = 20, 50

MAX437_T

V

RS+

= 12V,
VCC= 12V,
C

LOAD

= 10pF

V

SENSE

= 100mV, C

LOAD

= 10pF,

V

CC

= 12V, V

RS+

= 12V

Gain = +20V/V,
V

CC

= 12V,

V

RS+

= 12V,

C

LOAD

= 10pF

No sustained oscillations

V

SENSE

= 100mV

V

OUT

= 2V, V

RS+

> 2V

CONDITIONS

%

±0.64 ±5.2

∆A

V

Gain Accuracy

V/V

+20

A

V

kHz

200

BW-3dB Bandwidth

Gain

mV580 600 618Comparator Threshold

0.5

µs

20

OUT Settling Time to 1% of
Final Value

pF1000Capacitive Load Stability

Ω1.5R

OUT

OUT Output Resistance

72 87

UNITSMIN TYP MAXSYMBOLPARAMETER

120

110

50

V

SENSE

= 100mV,

Gain = +20V/V

V

SENSE

= 100mV,

Gain = +50V/V

V

SENSE

= 100mV,

Gain = +100V/V

V

SENSE

= 6.25mV

MAX437_H

MAX437_F

+100

+50

TA= +25°C

TA= -40°C to +85°C ±7.2

V

SENSE

= 6.25mV to

100mV

V

SENSE

= 100mV to

6.25mV

20

PSR

Power-Up Time to 1% of Final
Value

Power-Supply Rejection

ms

dB

VCC= 12V, V

RS+

= 12V, C

LOAD

= 10pF

Saturation Recovery Time
(Note 8)

ms0.1

mV-9Comparator Hysteresis

nA±2.2 ±15I

B

Input Bias Current

CL= 10pF, RL= 10kΩ pull-up to 5V,
5mV of overdrive

µs4Propagation Delay

I

SINK

= 1mA V0.6V

OL

Output Low Voltage

V

SENSE

=
20mV to 100mV,
V

CC

= 12V, V

RS+

= 12V,

Gain = 100

TA= +25°C

TA= -40°C to +85°C ±7.2

±0.62 ±5.0

COMPARATOR (Note 9)

ELECTRICAL CHARACTERISTICS (continued)

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

RS+

= 0 to +28V, V

SENSE

= 0, V

RESET

= 0, R

LOAD

= 1MΩ, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C.) (Note 1)

0

20

10

40

30

50

60

010155 202530

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX4373 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

MAX4373

MAX4374/MAX4375

V

SENSE

= 5mV

44

45

46

47

48

49

50

51

52

0105 15202530

SUPPLY CURRENT

vs. COMMON-MODE VOLTAGE

MAX4373 toc02

COMMON-MODE VOLTAGE (V)

SUPPLY CURRENT (µA)

MAX4374/MAX4375

MAX4373

V

SENSE

= 5mV

-2.0

-0.5

-1.0

-1.5

0

0.5

1.5

1.0

2.0

2684 10121416182022242628

TOTAL OUTPUT ERROR

vs. SUPPLY VOLTAGE

MAX4373 toc03

SUPPLY VOLTAGE (V)

OUTPUT ERROR (%)

AV = +100V/V

AV = +20V/V

AV = +50V/V

Typical Operating Characteristics

(V

RS+

= +12V, V

CC

= +12V, R

LOAD

= 1MΩ, V

RESET

= 0, V

SENSE

= 100mV, V

PULL-UP

= +5V, R

PULL-UP

= 10kΩ, TA= +25°C, unless

otherwise noted.)

MAX4373/MAX4374/MAX4375

Low-Cost, Micropower, High-Side Current-Sense
Amplifier + Comparator + Reference ICs

4 _______________________________________________________________________________________

Note 1: All devices are 100% production tested at TA= +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: Guaranteed by Gain Accuracy test. Output voltage is internally clamped not to exceed 12V.
Note 5: Total OUT Voltage Error and Full-Scale Accuracy are the sum of gain and offset voltage errors.
Note 6: Measured at I

OUT

= -500µA (R

LOAD

= 4kΩ for gain of +20V/V, R

LOAD

= 10kΩ for gain of +50V/V, R

LOAD

= 20kΩ for gain of

+100V/V).

Note 7: +6.25mV = 1/16 of +100mV full-scale voltage.
Note 8: The device will not experience phase reversal when overdriven.
Note 9: All comparator tests are done with V

RS+

= +12V.

Note 10: V

PULL-UP

is defined as an externally applied voltage through a resistor to pull up the comparator output.

ELECTRICAL CHARACTERISTICS (continued)

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

RS+

= 0 to +28V, V

SENSE

= 0, V

RESET

= 0, R

LOAD

= 1MΩ, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical

values are at T

A

= +25°C.) (Note 1)

VCC= 28V, V

PULL-UP

= 5V (Note 10)

CONDITIONS

µA1Output High Leakage Current

UNITSINTYP MAXSYMBOLPARAMETER

V2.0V

IH

RESET Input High Voltage

V0.8V

IL

RESET Input Low Voltage

V

IL

= 0, VIH= 5.5V, VCC= 28V µA-0.5 0.5IIL, I

IH

Logic Input Current

µs3t

RPD

RESET Propagation Delay

µs1.5t

RPW

Minimum RESET Pulse Width