MAX9934FART+TG0Y Maxim Integrated, MAX9934FART+TG0Y Datasheet

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MAX9934FART+TG0Y

Manufacturer Part Number
MAX9934FART+TG0Y
Description
Special Purpose Amplifiers
Manufacturer
Maxim Integrated
Series
MAX9934r
Datasheet
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.
µMAX is a registered trademark and UCSP is a trademark of
Maxim Integrated Products, Inc.
High-Precision, Low-Voltage, Current-Sense Amplifier
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
with Current Output and Chip Select for Multiplexing
CC
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
OS
General Description
) is a low 10µV (max) at +25°C
M
) with gain accuracy better
CC
CC
. 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.
MAX9934FART+T
MAX9934FAUA+T
MAX9934FAUA/V+T
MAX9934TART+T
MAX9934TAUA+T
MAX9934TAUA/V+T
Range
Current Monitors to One ADC
for Gain Flexibility
and 5µA/mV (MAX9934F)
and 8-Pin µMAX Packages
-0.1V ≤ V
PART
CM
≤ 5.5V
R
I
SENSE
LOAD
Typical Operating Circuit
RS+
RS-
Ordering Information
25µA/mV
25µA/mV
25µA/mV
5µA/mV
5µA/mV
5µA/mV
V
GND
V
GAIN
CC
CC
M
= 3.3V
of 25µA/mV (MAX9934T)
0.1µF
MAX9934
EVALUATION KIT AVAILABLE
OUT
CS
MAX9934
FROM µC
CHIP SELECT
Selection
PIN-
PACKAGE
6 UCSP
8 µMAX
8 µMAX
6 UCSP
8 µMAX
8 µMAX
OUT
10kΩ
R
OUT
19-5011; Rev 3; 11/12
Features
V
OUT
TO ADC
1000pF
MARK
AAG
AAG
TOP
AAF
AAF

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MAX9934FART+TG0Y Summary of contents

Page 1

... Notebook PCs and Ultra-Mobile PCs Portable Current Monitoring µMAX is a registered trademark and 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. o Input Offset Voltage: 10µV (max) o Gain Error Less than 0 ...

Page 2

... A -0.1 128 134 ≤ +125°C 112 A 128 135 ≤ +125°C 109 A 119 125 ≤ +125°C 104 A 98 113 ≤ +125° MAX UNITS ±10 ±14 µV ±10 ±20 ±60 nV/°C ±90 +5 Maxim Integrated ...

Page 3

... Input Voltage High CS Input Current CS POWER SUPPLY Supply-Voltage Range Power-Supply Rejection Ratio Supply Current Supply Current, Output Deselected AC CHARACTERISTICS (C = 1000pF) L Amplifier Bandwidth Maxim Integrated = 0V )/ RS+ RS- = -40°C to +125°C, unless otherwise noted. Typical values are SYMBOL CONDITIONS ...

Page 4

... Unless otherwise noted, specifications overtemperature are guaran- A ≤ 3.1V for the MAX9934T; 0.25V ≤ V OUT = 3.3V 10kΩ to GND for unidirectional opera- CS OUT MIN TYP 670 220 150 80 = 10pF 10pF 300 200 ≤ 2.5V for the MAX9934F. OUT = A MAX UNITS µs µs µs µs µs Maxim Integrated ...

Page 5

... COMMON-MODE VOLTAGE (V) MAX9934F GAIN ERROR HISTOGRAM (%) Maxim Integrated Typical Operating Characteristics = 0V 1000pF 10kΩ to GND for unidirectional operation, R SENSE L OUT MAX9934T DRIFT V HISTOGRAM TCV (nV/NC) OS ...

Page 6

... SENSE OS SUPPLY CURRENT vs. TEMPERATURE ( 160 140 120 V = 5.5V CM 100 -40 -25 - 110 125 TEMPERATURE (°C) RS+ BIAS CURRENT vs. V RS+ 10nA T = +125°C A 1nA 100pA T = +25°C AND -40°C A 10pA 1pA -0.1 0.6 1.3 2.0 2.7 3.4 4.1 4.8 V (V) RS+ 100 5.5 Maxim Integrated ...

Page 7

... A 1pA 100fA 0 0.5 1.0 1.5 2.0 V (V) OUT NORMALIZED GAIN vs. FREQUENCY 25FA/mV -20 -30 - 100 FREQUENCY (Hz) Maxim Integrated Typical Operating Characteristics (continued 1000pF 10kΩ to GND for unidirectional operation OUT ≤ RS- CC 2.4 2.9 3 -40°C A 2.5 3.0 3.5 4 5FA/mV 1k 10k ...

Page 8

... PERCENTAGE OF FINAL VALUE (%) LARGE-SIGNAL INPUT STEP RESPONSE (MAX9934T) MAX9934 toc25 V SENSE 5mV/div 0.01% FINAL VALUE V 1% FINAL VALUE OUT 500mV/div 400µs/div CS DISABLED TRANSIENT RESPONSE C = 10pF (MAX9934T) OUT MAX9934 toc27 2V/div V OUT 1V/div 4µs/div = 10kΩ Maxim Integrated ...

Page 9

... POWER-UP TIME V CS 2V/div 1% FINAL VALUE V OUT 500mV/div MAX9934T V OUT 500mV/div 0.1% FINAL VALUE MAX9934F 100Fs/div Maxim Integrated Typical Operating Characteristics (continued 1000pF 10kΩ to GND for unidirectional operation OUT MAX9934 toc28 1V 0.1% FINAL VALUE 1% FINAL VALUE 0.1µF BYPASS SATURATION RECOVERY TIME ...

Page 10

... MAX9934 supply Pin Description FUNCTION SENSE SENSE % FINAL VALUE Connect an % FINAL VALUE This ability to CC Maxim Integrated ...

Page 11

... The internal resistor (R ) sets the transconductance GAIN gain of the device. Both input and output transconduc- tance amplifiers feature excellent common-mode rejec- tion characteristics, helping the MAX9934 to deliver industry-leading precision specifications over the full common-mode range. Maxim Integrated 3. OUT 100mV Figure 3 ...

Page 12

... Advantages of Current-Output Architecture section. The MAX9934 is capable of both sourcing and sinking current from OUT, and thus can be used as a precision bidirectional current-sense amplifier. To enable this functionality, terminate R MICROCONTROLLER CS1 CS2 CS3 ADC (OPTIONAL midrail voltage V OUT Maxim Integrated . BIAS ...

Page 13

... For positive input-sense voltages, the MAX9934 sources current causing its output voltage to rise above V . For negative input-sense voltages, BIAS the MAX9934 sinks current causing its output voltage to be lower than V , thus allowing bidirectional current BIAS sensing. Maxim Integrated I LOAD1 SENSE OUT1 MAX9934 ...

Page 14

... MAX9934 V = 3.3V CC 1/4 MAX4737 I LOAD3 0.1µF R SENSE CS OUT3 MAX9934 R OUT 10kΩ Choosing R SENSE ) develops a sense voltage (V LOAD SENSE . Finally, the MAX9934 output cur- SENSE OUT that is proportional to OUT MICROCONTROLLER CS1 CS2 CS3 ADC (OPTIONAL) and R OUT ) SENSE ). The ) to develop Maxim Integrated ...

Page 15

... Due to the high currents that flow through R care to prevent trace resistance in the load current path from causing errors in the sense voltage. Use a four ter- minal current-sense resistor or Kelvin contacts (force and sense) PCB layout techniques. Maxim Integrated Table 1. Unidirectional Gain Table and the OUT ...

Page 16

... In addition, the MAX9934 is stable into an infinite capacitive load, allowing filtering flexibility. Figure 8 shows the MAX9934 in a multiplexed arrange- ment of strain-gauge amplifiers. vs. V OUT SENSE ASIC RS+ RS- MAX9934 Use as Precision Instrumentation Amplifier CC of the MAX9934 OS Maxim Integrated , ...

Page 17

... High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing R = R/2 OUT Figure 8. Multiplexed, Strain-Gauge Amplifier Operation Maxim Integrated V = 3.3V CC 0.1µF OUT1 V IN1 MAX9934 3.3V CC 0.1µF OUT2 V MAX9934 IN2 3.3V CC 0.1µF OUT3 V IN3 MAX9934 CS V OUT 10kΩ MAX9934 CS1 ...

Page 18

... Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 2x3 UCSP 8 µMAX Pin Configurations MAX9934T OUT GND UCSP Package Information LAND PACKAGE OUTLINE NO. PATTERN NO. CODE — R61A1+1 21-0228 90-0092 U8+1 21-0036 Maxim Integrated ...

Page 19

... Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed ...

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