max9934faua Maxim Integrated Products, Inc., max9934faua Datasheet

max9934faua

Manufacturer Part Number

max9934faua

Description

High-precision, Low-voltage, Current-sense Amplifier With Current Output And Chip Select For Multiplexing

Manufacturer

Maxim Integrated Products, Inc.

Datasheet

1.MAX9934FAUA.pdf (21 pages)

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The MAX9934** high-precision, low-voltage, high-side

current-sense amplifier is ideal for both bidirectional

(charge/discharge) and unidirectional current measure-

ments in battery-powered portable and laptop devices.

Input offset voltage (V

across the -0.1V to 5.5V input common-mode voltage

range, and is independent of V

specification allows the use of very small sense volt-

ages (typically ±10mV full-scale) for minimally invasive

current sensing.

The output of the MAX9934 is a current proportional to

input V

5µA/mV gain options (G

than 0.25% (max) at +25°C. A chip select (CS) allows

multiplexing of several MAX9934 current outputs to a

single microcontroller ADC channel (see the Typical

Operating Circuit ). CS is compatible with 1.8V and 3.3V

logic systems.

The MAX9934 is designed to operate from a 2.5V to

3.6V V

current. When powered down (V

draw less than 0.1nA (typ) leakage current to reduce

battery load. The MAX9934 is robust and protected

from input faults of up to ±6V input differential voltage

between RS+ and RS-.

The MAX9934 is specified for operation over the -40°C

to +125°C temperature range and is available in an

8-pin µMAX

0.6mm), making it ideal for space-sensitive applications.

19-5011; Rev 1; 1/10

µMAX is a registered trademark and UCSP is a trademark of

Maxim Integrated Products, Inc.

**Patent pending.

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

High-Precision, Low-Voltage, Current-Sense Amplifier

with Current Output and Chip Select for Multiplexing

PDAs and Smartphones

MP3 Players

Sensor Instrumentation Amplifiers

Notebook PCs and Ultra-Mobile PCs

Portable Current Monitoring

SENSE

supply, and draws just 120µA (typ) quiescent

or a 6-bump UCSP™ (1mm x 1.5mm x

and is available in either 25µA/mV or

________________________________________________________________ Maxim Integrated Products

General Description

) is a low 10µV (max) at +25°C

) with gain accuracy better

. Its precision input

Applications

= 0), RS+ and RS-

o Input Offset Voltage: 10µV (max)

o Gain Error Less than 0.25%

o -0.1V to +5.5V Input Common-Mode Voltage

o Chip Select Allows Multiplexing Several MAX9934

o Current Output Allows R

o Single Supply Operation: 2.5V to 3.6V

o Two Gain Options: G

o Bidirectional or Unidirectional Operation

o Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm)

Note: All devices are specified over the -40°C to +125°C

extended temperature range.

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

T = Tape and reel.

* Future product—contact factory for availability.

MAX9934FART+T*

MAX9934FAUA+T

MAX9934TART+T*

MAX9934TAUA+T

Range

Current Monitors to One ADC

for Gain Flexibility

and 5µA/mV (MAX9934F)

and 8-Pin µMAX Packages

-0.1V ≤ V

PART

≤ 5.5V

SENSE

LOAD

Typical Operating Circuit

RS+

RS-

Ordering Information

25µA/mV

5µA/mV

GND

GAIN

= 3.3V

of 25µA/mV (MAX9934T)

0.1µF

MAX9934

OUT

FROM µC

CHIP SELECT

Selection

PIN-

PACKAGE

6 UCSP

8 µMAX

6 UCSP

8 µMAX

OUT

10kΩ

OUT

Features

OUT

TO ADC

1000pF

MARK

AAG

TOP

AAF

—

Related parts for max9934faua

max9934faua Summary of contents

Page 1

... Bidirectional or Unidirectional Operation o Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm) and 8-Pin µMAX Packages = 0), RS+ and RS- PART MAX9934FART+T* MAX9934FAUA+T MAX9934TART+T* MAX9934TAUA+T Note: All devices are specified over the -40°C to +125°C extended temperature range. + Denotes a lead(Pb)-free/RoHS-compliant package. Applications T = Tape and reel. * Future product— ...

Page 2

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing ABSOLUTE MAXIMUM RATINGS RS+, RS- to GND......................................................-0. GND ..............................................................-0.3V to +4V CC CS, OUT to GND ( < V )..................-0.3V ...

Page 3

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing ELECTRICAL CHARACTERISTICS (continued 3.3V 3.0V RS+ RS- SENSE tion 10kΩ for bidirectional operation. T OUT ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing (V = 3.3V 3.0V RS+ RS- SENSE V /2 for bidirectional operation +25°C, unless otherwise noted MAX9934T V ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing PIN/BUMP NAME UCSP µMAX Power Supply CC Current Output. OUT provides an output current proportional to input OUT external resistor (R voltage ...

Page 11

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing 1. FINAL VALUE OUT t ZH Figure 2. Output Select and Deselect Time voltage. Further, when the amplifier ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing -0.1V ≤ V ≤ 5. IN1 -0.1V ≤ V ≤ 5.5V V IN2 CM -0.1V ≤ V ≤ 5.5V V IN3 CM UNIDIRECTIONAL OPERATION Figure 4. ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing -0.1V ≤ V ≤ 5. IN1 -0.1V ≤ V ≤ 5.5V V IN2 CM -0.1V ≤ V ≤ 5.5V V IN3 CM Figure 5. Bidirectional Multiplexed ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing A MAX9934 can be deselected by either forcing V low as shown in Figures 4 and making shown in Figure 6. In ...

Page 15

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing Three components are to be selected to optimize the current-sense system: R SENSE MAX9934 gain option (G = 25µA/mV or 5µA/mV). M Tables 1 and 2 are gain ...

Page 16

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing Effect of Input-Bias Currents The MAX9934 has extremely low CMOS input-bias cur- rents at both RS+ and RS- (0.1nA) when the input com- mon-mode voltage is less than ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing R/2 OUT Figure 8. Multiplexed, Strain-Gauge Amplifier Operation ______________________________________________________________________________________ V = 3.3V CC 0.1µF OUT1 IN1 MAX9934 3.3V CC 0.1µF ...

Page 18

High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing TOP VIEW + OUT 2 MAX9934T/F GND 3 N.C. 4 µMAX Chip Information PROCESS: BiCMOS 18 ______________________________________________________________________________________ TOP VIEW (BUMPS ON BOTTOM) 8 RS+ RS+ ...

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High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package ...

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... Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 21 © 2010 Maxim Integrated Products Revision History DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc. PAGES CHANGED — 1–10, 18 ...

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