Datasheet

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AVAILABLE

Functional Diagrams

Pin Configurations appear at end of data sheet.

Functional Diagrams continued at end of data sheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

For pricing, delivery, and

ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.

General Description

The MAX4372 low-cost, precision, high-side current-

sense amplifier is available in a tiny, space-saving

SOT23-5-pin 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 con-

sumes only 30µA. It features a voltage output that elimi-

nates 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 bat-

tery-powered systems since it does not interfere with

the ground path of the battery charger. The input com-

mon-mode range of 0 to 28V is independent of the sup-

ply voltage and ensures that the current-sense

feedback remains viable even when connected to a

2-cell 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 volt-

age gain and selecting the appropriate external sense

resistor. This capability offers a high level of integration

and flexibility, resulting in a simple and compact cur-

rent-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

Pin Configurations

RS+

1 5 RS-

MAX4372T/F/H

SOT23-5

UCSP

WEIV POTWEIV POT

(BUMPS ON BOTTOM)

3 4

OUT

GND

2 31

MAX4372T/F/H

RS+

RS-

Pin Configurations continued at end of datasheet.

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.

Ordering Information continued at end of datasheet.

UCSP is a trademark of Maxim Integrated Products, Inc.

+Denotes a lead(Pb)-free/RoHS-compliant package.

T = Tape and reel.

Features

o Low-Cost, Compact Current-Sense Solution

o 30µA Supply Current

o 2.7V to 28V Operating Supply

o 0.18% Full-Scale Accuracy

o 0.3mV Input Offset Voltage

o Low 1.5Ω Output Impedance

o Three Gain Versions Available

20V/V (MAX4372T)

50V/V (MAX4372F)

100V/V (MAX4372H)

o High Accuracy +2V to +28V Common-Mode

Range, Functional Down to 0V, Independent of

Supply Voltage

o Available in a Space-Saving 5-Pin SOT23 Package

and 3 x 2 UCSP™ (1mm x 1.5mm) Package

Low-Cost, UCSP/SOT23, Micropower, High-Side

Current-Sense Amplifier with Voltage Output

RS-

OUT

A/D

CONVERTER

GND

RS+

SENSE

LOAD

0 TO 28V

+2.7V TO +28V

0.1µF

MAX4372T/F/H

LOAD/

BATTERY

Typical Operating Circuit

19-1548; Rev 5; 5/11

PART

MAX4372TEUK-T

MAX4372TESA -40°C to +85°C

-40°C to +85°C

TEMP RANGE PIN-PACKAGE

5 SOT23-5

8 SO

Ordering Information

TOP

MARK

ADIU

—

MAX4372TEBT-T -40°C to +85°C 3 x 2 UCSP ACX

PART

MAX4372TEUK+T

+TMAX4372TESA -40°C to +85°C

-40°C to +85°C

TEMP RANGE PIN-PACKAGE

5 SOT23-5

8 SO

Ordering Information

TOP

MARK

ADIU

—

MAX4372TEBT+T -40°C to +85°C 3 x 2 UCSP ACX

MAX4372T/F/H MAX4372T/F/H

Summary of content (11 pages)

PAGE 1
MAX4372T/F/H LE AVAILAB Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output General Description The MAX4372 low-cost, precision, high-side currentsense amplifier is available in a tiny, space-saving SOT23-5-pin 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.
PAGE 2
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output ABSOLUTE MAXIMUM RATINGS VCC, RS+, RS- to GND ...........................................-0.3V to +30V OUT to GND ...........................................................-0.3V to +15V Differential Input Voltage (VRS+ - VRS-) ..............................±0.3V Current into Any Pin..........................................................
PAGE 3
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output ELECTRICAL CHARACTERISTICS (continued) (VRS+ = 0 to 28V, VCC = 2.7V to 28V, VSENSE = 0V, RLOAD = 1MΩ, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL OUT Low Voltage (MAX4372T, MAX4372F) VOL OUT Low Voltage (MAX4372H) VOL OUT High Voltage VCC - VOH -3dB Bandwidth BW CONDITIONS VCC = 2.7V, VSENSE = -10mV VRS+ = 28V VCC = 2.
PAGE 4
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Typical Operating Characteristics (VCC = 12V, VRS+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise noted.) AV = +100V/V AV = +50V/V 30.0 35 AV = +20V/V 30 AV = +100V/V 31.5 SUPPLY CURRENT (μA) 32.5 32.0 MAX4372T toc02 MAX4372 toc01 40 SUPPLY CURRENT (μA) 25 20 15 8 12 16 20 24 -15 28.0 10 35 60 85 8 12 16 20 24 1.0 -0.4 -0.6 -45 -50 -55 AV = +100V/V 0.
PAGE 5
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Typical Operating Characteristics (continued) (VCC = 12V, VRS+ = 12V, VSENSE = 100mV, TA = +25°C, unless otherwise noted.) MAX4372T SMALL-SIGNAL TRANSIENT RESPONSE MAX4372F SMALL-SIGNAL TRANSIENT RESPONSE MAX4372H SMALL-SIGNAL TRANSIENT RESPONSE MAX4372T toc10 MAX4372T toc11 MAX4372T toc12 30mV 30mV VSENSE 30mV VSENSE VSENSE 10mV 10mV 600mV VOUT 10mV 3V 1.5V VOUT VOUT 200mV 1V 0.
PAGE 6
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Pin/Bump Description PIN BUMP SOT23 1 SO 3 UCSP A2 2 4 3 4 NAME FUNCTION GND Ground A3 OUT Output Voltage. VOUT is proportional to the magnitude of VSENSE (VRS+ - VRS-). 1 A1 VCC Supply Voltage. Use at least a 0.1µF capacitor to decouple VCC from fast transients.
PAGE 7
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Table 1. Recommended Component Values FULL-SCALE LOAD CURRENT, ILOAD (A) 0.1 1 5 10 CURRENT-SENSE RESISTOR, RSENSE (mΩ) 1000 100 20 10 Using a PC Board Trace as RSENSE If the cost of RSENSE is an issue and accuracy is not critical, use the alternative solution shown in Figure 2. This solution uses copper PC board traces to create a sense resistor. The resistivity of a 0.
PAGE 8
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output d Ordering Information (continued) PART TEMP RANGE PIN-PACKAGE Pin Configurations (continued) TOP MARK MAX4372FEUK+T -40°C to +85°C 5 SOT23-5 T -40°C to +85°C 8 SO MAX4372FESA+T ADIV — MAX4372FEBT+T -40°C to +85°C 3 x 2 UCSP ACY MAX4372HEUK+T -40°C to +85°C 5 SOT23-5 +T -40°C to +85°C 8 SO MAX4372HESA+T MAX4372HEBT+T -40°C to +85°C 3 x 2 UCSP +Denotes a lead(Pb)-free/RoHS-compliant package.
PAGE 9
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Package Information (continued) SOICN .EPS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 10
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Package Information (continued) SOT-23 5L .EPS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status.
PAGE 11
MAX4372T/F/H Low-Cost, UCSP/SOT23, Micropower, High-Side Current-Sense Amplifier with Voltage Output Revision History REVISION NUMBER REVISION DATE 4 7/09 Updated feature in accordance with actual performance of the product 5 5/11 Updated VRST conditions to synchronize with tested material and added lead-free designation DESCRIPTION PAGES CHANGED 1 1, 2, 3, 8 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.