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MAX9934

更新时间： 2024-11-14 11:14:07
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美信 - MAXIM 放大器
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22页 1004K
描述
High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select for Multiplexing

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MAX9934 数据手册

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19-5011; Rev 0; 10/09  
High-Precision, Low-Voltage, Current-Sense Amplifier  
with Current Output and Chip Select for Multiplexing  
MAX934  
General Description  
Features  
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.  
o Input Offset Voltage: 10µV (max)  
o Gain Error Less than 0.25%  
o -0.1V to +5.5V Input Common-Mode Voltage  
Range  
Input offset voltage (V ) is a low 10µV (max) at +25°C  
OS  
across the -0.1V to 5.5V input common-mode voltage  
o Chip Select Allows Multiplexing Several MAX9934  
range, and is independent of V . Its precision input  
CC  
Current Monitors to One ADC  
specification allows the use of very small sense volt-  
ages (typically 10mV full-scale) for minimally invasive  
current sensing.  
o Current Output Allows R  
Selection  
OUT  
for Gain Flexibility  
o Single Supply Operation: 2.5V to 3.6V  
The output of the MAX9934 is a current proportional to  
input V  
and is available in either 25µA/mV or  
o Two Gain Options: G of 25µA/mV (MAX9934T)  
SENSE  
M
5µA/mV gain options (G ) with gain accuracy better  
and 5µA/mV (MAX9934F)  
M
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.  
o Bidirectional or Unidirectional Operation  
o Small, 6-Bump UCSP (1mm x 1.5mm x 0.6mm),  
6-Pin µDFN (2mm x 2mm x 0.6mm), and 8-Pin  
µMAX Packages  
Ordering Information  
The MAX9934 is designed to operate from a 2.5V to  
3.6V V  
supply, and draws just 120µA (typ) quiescent  
CC  
PIN-  
PACKAGE  
TOP  
MARK  
current. When powered down (V  
= 0), RS+ and RS-  
CC  
PART  
GAIN  
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-.  
MAX9934FALT+T*  
MAX9934FART+T*  
MAX9934FAUA+T  
MAX9934TALT+T*  
MAX9934TART+T*  
MAX9934TAUA+T  
5µA/mV  
5µA/mV  
5µA/mV  
25µA/mV  
25µA/mV  
25µA/mV  
6 µDFN  
6 UCSP  
8 µMAX  
6 µDFN  
6 UCSP  
8 µMAX  
ACP  
AAG  
—
The MAX9934 is specified for operation over the -40°C  
to +125°C temperature range and is available in 8-pin  
µMAX®, 6-pin µDFN (2mm x 2mm x 0.8mm), or a 6-  
bump UCSP™ (1mm x 1.5mm x 0.6mm), making it ideal  
for space-sensitive applications.  
ACO  
AAF  
—
Note: All devices are specified over the -40°C to +125°C  
extended temperature range.  
Applications  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
PDAs and Smartphones  
T = Tape and reel.  
MP3 Players  
*Future product—contact factory for availability.  
Sensor Instrumentation Amplifiers  
Notebook PCs and Ultra-Mobile PCs  
Portable Current Monitoring  
Typical Operating Circuit  
V
= 3.3V  
CC  
0.1µF  
I
LOAD  
-0.1V ≤ V ≤ 5.5V  
CM  
V
CC  
R
SENSE  
MAX9934  
RS-  
RS+  
V
TO ADC  
OUT  
OUT  
R
OUT  
10kΩ  
1000pF  
GND  
CS  
FROM µC  
CHIP SELECT  
µMAX is a registered trademark and UCSP is a trademark of  
Maxim Integrated Products, Inc.  
**Patent pending.  
________________________________________________________________ Maxim Integrated Products  
1
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.  
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MAX9934_V01 MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934FALT+T MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934FART+ MAXIM

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 		Analog Circuit, 1 Func, BICMOS, PBGA6, 1 X 1.50 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, UCSP-6
MAX9934FART+T MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934FART+TG0Y MAXIM

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 		Analog Circuit, 1 Func, BICMOS, PBGA6, 1 X 1.50 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, UCSP-6
MAX9934FAUA/V+T MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934FAUA+ MAXIM

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 		Analog Circuit, 1 Func, BICMOS, PDSO8, ROHS COMPLIANT, MICRO MAX-8
MAX9934FAUA+T MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934TALT+T MAXIM

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 		High-Precision, Low-Voltage, Current-Sense Amplifier with Current Output and Chip Select f
MAX9934TART+ MAXIM

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 		Analog Circuit, 1 Func, BICMOS, PBGA6, 1 X 1.50 MM, 0.60 MM HEIGHT, ROHS COMPLIANT, UCSP-6

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