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MAX9918_V01

更新时间： 2024-11-05 02:52:43
品牌 Logo 应用领域
美信 - MAXIM /
页数 文件大小 规格书
19页 1326K
描述
-20V to 75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

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MAX9918_V01 数据手册

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Click here for production status of specific part numbers.  
MAX9918/MAX9919/MAX9920  
-20V to +75V Input Range,  
Precision Uni-/Bidirectional,  
Current-Sense Amplifiers  
General Description  
Benefits and Features  
● Reduce Protective Clamping for High Inductive  
The MAX9918/MAX9919/MAX9920 are single-supply,  
high-accuracy current-sense amplifiers with a high  
input common-mode range that extends from -20V  
to +75V. These amplifiers are well suited for current  
monitoring of inductive loads such as motors and  
solenoids, where common-mode voltages can become  
negative due to inductive kickback, reverse-battery  
conditions, or transient events.  
Kickback Voltage  
• -20V to +75V Input Common-Mode Voltage Range  
● Supports Wide Range of Precision AC and DC  
Current Sensing Applications  
• Uni- or Bidirectional Current Sensing  
• 0.6% (max) Gain Accuracy Error  
• 400µV (max) Input Offset Voltage  
• 120kHz, -3dB Bandwidth (MAX9919N)  
• Reference Input for Bidirectional OUT  
• Rail-to-Rail Output  
The MAX9918/MAX9920 feature adjustable gain set  
by an external resistive-divider network. The MAX9919  
features fixed gains of 45V/V (MAX9919F) and 90V/V  
(MAX9919N). The MAX9918/MAX9919/MAX9920  
● Saves Board Space  
operate as unidirectional amplifiers when V  
= GND  
• 8-Pin SOIC Package  
REFIN  
• Single-Supply Operation (4.5V to 5.5V)  
● AEC-Q100 Qualified (MAX9918ASA/V+,  
MAX9919FASA/V+, MAX9919NASA/V+,  
MAX9920ASA/V+ Only)  
and as bidirectional amplifiers when V  
= V /2.  
REFIN  
CC  
The MAX9920 attenuates the input signal by a factor of  
4 at the input level-shifting stage allowing the device to  
sense voltages up to 200mV (unidirectional operation) or  
±100mV (bidirectional operation).  
Ordering Information/Selector Guide  
The MAX9918/MAX9919/MAX9920 operate with a  
single 5V supply voltage, are fully specified over the  
-40°C to +125°C automotive temperature range, and are  
available in an 8-pin SOIC package.  
VSENSE  
(mV)  
GAIN  
(V/V)  
PIN-  
PACKAGE  
PART  
MAX9918ASA+  
±50  
±50  
Adjustable  
Adjustable  
45  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
8 SO-EP*  
MAX9918ASA/V+  
MAX9919FASA+  
MAX9919FASA/V+  
MAX9919NASA+  
MAX9919NASA/V+  
MAX9920ASA+  
±50  
Applications  
● H-Bridge Motor Current Sensing  
● Solenoid Current Sensing  
● Current Monitoring of Inductive Loads  
● High- and Low-Side Precision Current Sensing  
● Super-Capacitor Charge/Discharge Monitoring  
● Precision High-Voltage Current Monitoring  
● Automotive  
±50  
45  
±50  
90  
±50  
90  
±200  
±200  
Adjustable  
Adjustable  
MAX9920ASA/V+  
Note: All devices operate over the -40°C to +125°C temperature range.  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
/V denotes an automotive qualified part.  
*EP = Exposed pad.  
Typical Operating Circuit  
V
V
CC  
CC  
V
BATT  
MAX9918  
MAX9920  
OUT  
FB  
ø1A  
ø2B  
A
ADC  
R
SENSE  
R2  
R1  
M
RS+  
RS-  
INPUT STAGE  
LEVEL SHIFTER  
REFIN  
REF  
ADJUSTABLE GAIN  
µC  
ø1B  
ø2B  
SHDN  
GND  
GND  
19-5015; Rev 10; 7/19  
1234567...19

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