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MAX9918_11

更新时间： 2024-11-04 11:14:11
品牌 Logo 应用领域
美信 - MAXIM 放大器
页数 文件大小 规格书
18页 2377K
描述
-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

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MAX9918_11 数据手册

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19-5015; Rev 3; 6/11  
-20V to +75V Input Range, Precision  
Uni-/Bidirectional, Current-Sense Amplifiers  
81/MAX920  
General Description  
Features  
o -20V to +75V Input Common-Mode Voltage Range  
o 400µV (max) Input Offset Voltage  
o 0.6% (max) Gain Accuracy Error  
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 moni-  
toring 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.  
o Uni- or Bidirectional Current Sensing  
o Reference Input for Bidirectional OUT  
o 120kHz, -3dB Bandwidth (MAX9919N)  
o Single-Supply Operation (4.5V to 5.5V)  
o 1mA Supply Current  
The MAX9918/MAX9920 feature adjustable gain set by  
an external resistive-divider network. The MAX9919 fea-  
tures fixed gains of 45V/V (MAX9919F) and 90V/V  
(MAX9919N). The MAX9918/MAX9919/MAX9920 oper-  
o 0.5µA (typ) Shutdown Current  
ate as unidirectional amplifiers when V  
= GND  
CC  
REFIN  
and as bidirectional amplifiers when V  
= V /2.  
REFIN  
o Rail-to-Rail Output  
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).  
o -40°C to +125°C Automotive Temperature Range  
Ordering Information/  
Selector Guide  
The MAX9918/MAX9919/MAX9920 operate with a sin-  
gle 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.  
V
GAIN  
(V/V)  
SENSE  
(mV)  
PART  
PIN-PACKAGE  
Applications  
H-Bridge Motor Current Sensing  
Solenoid Current Sensing  
MAX9918ASA+  
MAX9918ASA/V+  
MAX9919FASA+  
MAX9919NASA+  
MAX9920ASA+  
50  
50  
Adjustable 8 SOIC-EP*  
Adjustable 8 SOIC-EP*  
50  
45  
90  
8 SOIC-EP*  
8 SOIC-EP*  
50  
Current Monitoring of Inductive Loads  
High- and Low-Side Precision Current Sensing  
4x4 Transmission Control  
200  
Adjustable 8 SOIC-EP*  
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.  
Electronic Throttle Control  
Super-Capacitor Charge/Discharge Monitoring in  
Hybrid Cars  
Precision High-Voltage Current Monitoring  
Typical Operating Circuit  
V
V
CC  
CC  
V
BATT  
OUT  
FB  
φ2B  
φ1A  
MAX9918  
MAX9920  
A
ADC  
R
SENSE  
R2  
R1  
M
RS+  
INPUT STAGE  
LEVEL SHIFTER  
RS-  
REFIN  
REF  
ADJUSTABLE GAIN  
μC  
φ1B  
φ2B  
SHDN  
GND  
GND  
________________________________________________________________ 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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