Datasheet

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General Description

The MAX4073 low-cost, high-side current-sense ampli-

fier features a voltage output that eliminates the need

for gain-setting resistors making it ideal for cell phones,

notebook computers, PDAs, and other systems where

current monitoring is crucial. High-side current moni-

toring does not interfere with the ground path of the

battery charger making the MAX4073 particularly useful

in battery-powered systems. The input common-mode

range of +2V to +28V is independent of the supply volt-

age. The MAX4073’s wide 1.8MHz bandwidth makes it

suitable for use inside battery-charger control loops.

The combination of three gain versions and a selec-

table external-sense resistor sets the full-scale current

reading. The MAX4073 offers a high level of integra-

tion, resulting in a simple and compact current-sense

solution.

The MAX4073 operates from a +3V to +28V single sup-

ply and draws only 0.5mA of supply current. This

device is specified over the automotive operating tem-

perature range (-40

°C to +125°C) and is available in a

space-saving 5-pin SC70 package (half the size of the

SOT23).

For a similar device in a 6-pin SOT23 with a wider com-

mon-mode voltage range (0 to +28V), see the

MAX4173 data sheet.

Applications

Cell Phones

Notebook Computers

Portable/Battery-Powered Systems

Smart Battery Packs/Chargers

PDAs

Power Management Systems

PA Bias Control

General System/Board-Level Current Monitoring

Precision Current Sources

Features

♦ Low-Cost, Compact, Current-Sense Solution

♦ Three Gain Versions Available

+20V/V (MAX4073T)

+50V/V (MAX4073F)

+100V/V (MAX4073H)

♦ ±1.0% Full-Scale Accuracy

♦ 500µA Supply Current

♦ Wide 1.8MHz Bandwidth

♦ +3V to +28V Operating Supply

♦ Wide +2V to +28V Common-Mode Range

Independent of Supply Voltage

♦ Automotive Temperature Range (-40

°C to +125°C)

♦ Available in Space-Saving 5-Pin SC70 Package

MAX4073T/F/H

Low-Cost, SC70, Voltage-Output,

High-Side Current-Sense Amplifier

Typical Operating Circuit

19-2048; Rev 1; 8/12

For pricing, delivery, and ordering information, please contact Maxim Direct

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

Ordering Information

Pin Configurations appear at end of data sheet.

PART TEMP. RANGE PIN-PACKAGE GAIN (V/V) TOP MARK

MAX4073TAXK+T -40°C to +125°C 5 SC70 20 ACM

MAX4073TAUT+T -40°C to +125°C 6 SOT23 20 AAUE

MAX4073FAXK+T -40°C to +125°C 5 SC70 50 ACN

MAX4073FAUT+T -40°C to +125°C 6 SOT23 50 AAUF

MAX4073HAXK+T -40°C to +125°C 5 SC70 100 ACO

MAX4073HAUT+T -40°C to +125°C 6 SOT23 100 AAUG

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

MAX4073T/F/H

SENSE

LOAD

+2V TO +28V

SENSE

OUT

GND

RS+

+3V TO +28V

0.1µF

RS-

LOAD/

BATTERY

LOW-COST

SWITCHING

REGULATOR

Summary of content (12 pages)

PAGE 1
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier General Description The MAX4073 low-cost, high-side current-sense amplifier features a voltage output that eliminates the need for gain-setting resistors making it ideal for cell phones, notebook computers, PDAs, and other systems where current monitoring is crucial. High-side current monitoring does not interfere with the ground path of the battery charger making the MAX4073 particularly useful in battery-powered systems.
PAGE 2
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier ABSOLUTE MAXIMUM RATINGS VCC to GND ............................................................-0.3V to +30V RS+, RS- to GND....................................................-0.3V to +30V OUT to GND ...............................................-0.3V to (VCC + 0.3V) Output Short-Circuit to GND ......................................Continuous Differential Input Voltage (VRS+ - VRS-) .................................
PAGE 3
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier ELECTRICAL CHARACTERISTICS (continued) (VRS+ = +2V to +28V, VSENSE = (VRS+ - VRS-) = 0, VCC = +3V to +28V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1) PARAMETER Bandwidth SYMBOL BW CONDITIONS VCC = 12V, VRS+ = 12V, CLOAD = 5pF MIN 1.8 MAX4073F, VSENSE = 100mV 1.7 MAX4073H, VSENSE = 100mV 1.6 MAX4073T/F/H VSENSE = 6.
PAGE 4
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (VCC = +12V, VRS+ = +12V, VSENSE = 100mV, CL = 5pF, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 0.49 0.48 0.47 MAX4073T 0.46 1.1 1.0 MAX4073F 0.8 0.7 0.45 MAX4073T 0.6 VSENSE = 6.25mV 10 15 20 25 5 10 15 25 30 -50 0 25 50 75 100 OUTPUT HIGH VOLTAGE (VCC - VOH) vs. TEMPERATURE 0.51 MAX4073F 0.49 VSENSE = 100mV 1.50 MAX4073H 1.40 MAX4073T 0.
PAGE 5
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (continued) (VCC = +12V, VRS+ = +12V, VSENSE = 100mV, CL = 5pF, TA = +25°C, unless otherwise noted.) 1.5 0.4 GAIN ACCURACY (%) VCC = +12V 0.2 0 -0.2 VCC = +28V -0.4 0 -0.5 5 -2.0 -25 0 25 50 75 0 -50 100 125 150 -25 TEMPERATURE (°C) 0 25 75 50 TEMPERATURE (°C) 100 125 0.
PAGE 6
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Typical Operating Characteristics (continued) (VCC = +12V, VRS+ = +12V, VSENSE = 100mV, CL = 5pF, TA = +25°C, unless otherwise noted.) MAX4073T LARGE-SIGNAL TRANSIENT RESPONSE MAX4073F LARGE-SIGNAL TRANSIENT RESPONSE MAX4073 toc17 MAX4073 toc18 100mV 100mV VSENSE 45mV/div VSENSE 45mV/div 6.25mV 6.25mV 2V 5V OUT 0.9V/div OUT 2.35V/div 0.120V 0.
PAGE 7
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Pin Description PIN NAME FUNCTION SOT23 1, 2 SC70 2 GND Ground 3 3 VCC Supply Voltage Input. Bypass to GND with a 0.1µF capacitor. 4 4 RS+ Power-Side Connection to the External Sense Resistor 5 5 RS- Load-Side Connection to the External Sense Resistor OUT Voltage Output. VOUT is proportional to VSENSE. Output impedance is approximately 12kΩ.
PAGE 8
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier somewhat better, and low-inductance metal-film resistors are best suited for these applications. INPUT 0.3in COPPER For VSENSE = 100mV, full-scale output voltage can be 2V, 5V, or 10V depending on the gain. For proper operation, ensure VCC exceeds the full-scale output voltage by 1.2V (see Output High Voltage (V CC - V OH ) vs. Temperature in the Typical Operating Characteristics). 0.
PAGE 9
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Table 1. Recommended Component Values FULL-SCALE LOAD CURRENT ILOAD (A) CURRENT-SENSE RESISTOR 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 50 5.0 100 10.0 20 2.0 50 5.0 100 10.0 20 2.0 50 5.0 100 10.
PAGE 10
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 11
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Package Information (continued) 6LSOT.EPS For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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 12
MAX4073T/F/H Low-Cost, SC70, Voltage-Output, High-Side Current-Sense Amplifier Revision History REVISION NUMBER REVISION DATE 0 5/01 Initial release — 2 8/12 Added lead-free notation to Ordering Information. 1 DESCRIPTION PAGES CHANGED Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.