Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsLinear ICsLinear IC - Op-amp Current sensor SOT 23 6

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 MAX4173 low-cost, precision, high-side current-

sense 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 cur-

rent 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 con-

nected 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 user-

selectable external sense resistor sets the full-scale

current reading. This feature offers a high level of inte-

gration, resulting in a simple and compact current-

sense solution.

The MAX4173 operates from a single +3V to +28V sup-

ply, 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

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

o Low-Cost, Compact Current-Sense Solution

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

Range, Functional Down to 0V, Independent of

Supply Voltage

o Three Gain Versions Available

+20V/V (MAX4173T)

+50V/V (MAX4173F)

+100V/V (MAX4173H)

o ±0.5% Full-Scale Accuracy

o ±3mV Input Offset Voltage (MAX4173T)

o Wide 1.7MHz Bandwidth (MAX4173T)

o 420µA Supply Current

o Available in Space-Saving SOT23 Package

Low-Cost, SOT23, Voltage-Output,

High-Side Current-Sense Amplifier

MAX4173T/F/H

SENSE

0 TO +28V

LOAD

SENSE

OUT

GND

RS+

+3V TO +28V

RS-

LOAD/

BATTERY

A/D

CONVERTER

0.1µF

Typical Operating Circuit

PART

MAX4173TEUT+T

MAX4173TESA+

PIN-PACKAGE

6 SOT23

8 SO

Ordering Information

-40°C to +85°C

TEMP RANGE SOT TOP MARK

AABN

—

MAX4173FEUT+T -40°C to +85°C 6 SOT23 AABO

MAX4173FESA+ -40°C to +85°C 8 SO —

MAX4173HEUT+T -40°C to +85°C 6 SOT23 AABP

MAX4173HESA+ -40°C to +85°C 8 SO —

GAIN (V/V)

100

Pin Configurations appear at end of data sheet.

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

= Tape and reel.

MAX4173

19-1434; Rev 5; 4/11

Summary of content (10 pages)

PAGE 1
LE AVAILAB MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier 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.
PAGE 2
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier ABSOLUTE MAXIMUM RATINGS VCC, RS+, RS- to GND .......................................... -0.3V to +30V OUT to GND .............................................. -0.3V to (VCC + 0.3V) Output Short-Circuit to VCC or GND ......................... Continuous Differential Input Voltage (VRS+ - VRS-) ............................. ±0.3V Current into Any Pin.........................................................
PAGE 3
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier ELECTRICAL CHARACTERISTICS (continued) (VRS+ = 0 to +28V, VCC = +3V to +28V, VSENSE = 0V, TA = TMIN to TMAX, RLOAD = ∞ unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Bandwidth Gain SYMBOL BW AV ∆AV CONDITIONS VRS+ = +12V, VCC = +12V, CLOAD = 5pF MIN TYP MAX4173T, VSENSE = +100mV 1.7 MAX4173F, VSENSE = +100mV 1.4 MAX4173H, VSENSE = +100mV 1.2 VSENSE = +6.25mV (Note 4) 0.
PAGE 4
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (VCC = +12V, VRS+ = +12V, VSENSE = +100mV, TA = +25°C, unless otherwise noted.) MAX4173H 400 MAX4173F 390 400 MAX4173F 350 300 MAX4173H 15 20 25 TOTAL OUTPUT ERROR vs. SUPPLY VOLTAGE MAX4173T 0 MAX4173H -0.15 MAX4173F -0.30 25 40 55 70 MAX4173 toc03 1.5 2.0 2.
PAGE 5
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (continued) (VCC = +12V, VRS+ = +12V, VSENSE = +100mV, TA = +25°C, unless otherwise noted.) MAX4173 toc10 2.0 TOTAL OUTPUT ERROR (%) 1.5 1.0 CL = 5pF MAX4173H IN (45mV/div) MAX4173T 0.5 MAX4173 toc11 MAX4173T LARGE-SIGNAL TRANSIENT RESPONSE (VSENSE = 6mV to 100mV) TOTAL OUTPUT ERROR vs. TEMPERATURE 100mV 6mV 0 2V -0.5 MAX4173F OUT (500mV/div) -1.0 0.120V -1.5 -2.
PAGE 6
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (continued) (VCC = +12V, VRS+ = +12V, VSENSE = +100mV, TA = +25°C, unless otherwise noted.) MAX4173H SMALL-SIGNAL TRANSIENT RESPONSE (VSENSE = 95mV to 100mV) CL = 5pF IN (5mV/div) MAX4173 toc17 MAX4173 toc15 START-UP DELAY (VCC = 0 to 4V) (VSENSE = 100mV) 100mV 95mV 4V IN (2V/div) 0V 2V 10V OUT (200mV/div) OUT (1V/div) 0V 9.
PAGE 7
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Detailed Description The MAX4173 high-side current-sense amplifier features a 0 to +28V input common-mode range that is independent of supply voltage. This feature allows the monitoring of current out of a battery in deep discharge and also enables high-side current sensing at voltages greater than the supply voltage (VCC). The MAX4173 operates as follows: Current from the source flows through RSENSE to the load (Figure 1).
PAGE 8
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Table 1. Recommended Component Values FULL-SCALE LOAD CURRENT ILOAD (A) CURRENT-SENSE RESISTOR Ω) RSENSE (mΩ GAIN FULL-SCALE OUTPUT VOLTAGE (FULL-SCALE VSENSE = 100mV) VOUT (V) 20 2.0 0.1 1000 50 5.0 100 10.0 20 2.0 1 100 5 20 10 10 INPUT 0.1 in. COPPER + _ 0.3 in. COPPER VSENSE RS- RS+ 5.0 10.0 20 2.0 50 5.0 100 10.0 20 2.0 50 5.0 100 10.0 LOAD/BATTERY RSENSE 0.3 in.
PAGE 9
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Pin Configurations TOP VIEW + GND 1 GND 2 MAX4173 VCC 3 6 OUT 5 RS- 4 + VCC 1 RS+ SOT23 8 RS+ 7 N.C. N.C. 2 GND 3 6 RS- OUT 4 5 N.C. MAX4173 SO Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only.
PAGE 10
MAX4173 Low-Cost, SOT23, Voltage-Output, High-Side Current-Sense Amplifier Revision History REVISION NUMBER REVISION DATE 4 6/10 Clarified 0V to 2V is not a high-accuracy range for the device, added lead-free options and soldering temperature 1, 2 5 4/11 Updated VRS+ conditions to synchronize with tested material 2, 3 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.