MAX9918_V01 [MAXIM]
-20V to 75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers;
| 型号： | MAX9918_V01 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | -20V to 75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers |
| 文件： | 总19页 (文件大小：1326K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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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
MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Absolute Maximum Ratings
V
to GND ............................................................-0.3V to +6V
Output Short Circuit to V
or GND .........................Continuous
CC
CC
RS+, RS- to GND (V
RS+, RS- to GND (V
= 5V)................................-30V to +80V
= 0V)...........-15V to +80V (15 minutes)
Continuous Current into Any Pin
(Not to exceed package power dissipation) .................±20mA
CC
CC
Differential Input Voltage (V
- V
)
Continuous Power Dissipation (T = +70°C)
RS+
RS-
A
(MAX9918/MAX9919)................................±15V (Continuous)
Differential Input Voltage
8-Pin SO-EP (derate 24.4mW/°C above +70°C) .. 1951.2mW**
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow).......................................+260°C
(V
- V
) (MAX9920)...........................±5V (Continuous)
RS+
RS-
REFIN, FB, OUT to GND ......................... -0.3V to (V
+ 0.3V)
CC
SHDN to GND .......................................................-0.3V to +20V
**As per JEDEC51 Standard (multilayer board).
(Note 1)
Package Thermal Characteristics
SO-EP
Junction-to-Ambient Thermal Resistance (θ ) ..........41°C/W
JA
Junction-to-Case Thermal Resistance (θ ).................7°C/W
JC
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Package Information
8 SO-EP
PACKAGE CODE
S8E+14
Outline Number
21-0111
90-0151
Land Pattern Number
Thermal Resistance, Single-Layer Board:
Junction to Ambient (θ
)
52°C/W
6°C/W
JA
Junction to Case (θ
)
JC
Thermal Resistance, Four-Layer Board:
Junction to Ambient (θ
)
41°C/W
7°C/W
JA
Junction to Case (θ
)
JC
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board.
For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Electrical Characteristics
(V
= 5V, V
= V
= +14V, V
= (V
- V
) = 0V, V
= V
= 0V, V
= V /2, R = 100kΩ; for MAX9918,
CC
RS+
RS-
SENSE
RS+
RS-
SHDN
GND
REFIN CC L
A
= 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A = 20V/V, R2/R1 = 79kΩ/1kΩ; T = -40°C to +125°C, unless otherwise noted. Typical
V
V A
values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
= +25°C
±0.14
±0.4
A
V
= V
=
RS+
RS-
+14V, V
= 0V
T
= -40°C to
REFIN
A
±0.7
±0.4
±1.3
±0.4
±0.9
±0.4
±1.0
±1.2
±3.0
±0.9
±3.5
+125°C
MAX9918
T
= +25°C
±0.08
±0.18
±0.11
±0.48
±0.10
A
A
V
= V
=
RS+
RS-
REFIN
-2V, V
= 0V
T
= -40°C to
+125°C
T
= +25°C
A
A
V
RS+
= V
=
RS-
+14V, V
= 0V
T
= -40°C to
REFIN
+125°C
Input Offset Voltage (Note 2)
V
MAX9919_
mV
OS
T
= +25°C
A
A
V
RS+
= V
=
RS-
-2V, V
= 0V
T
= -40°C to
REFIN
+125°C
T
= +25°C
A
A
V
RS+
= V
=
RS-
+14V, V
= 0V
T
= -40°C to
REFIN
+125°C
MAX9920
T
= +25°C
A
A
V
= V
=
RS+
RS-
REFIN
-2V, V
= 0V
T
= -40°C to
+125°C
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Electrical Characteristics (continued)
(V
= 5V, V
= V
= +14V, V
= (V
- V
) = 0V, V
= V
= 0V, V
= V /2, R = 100kΩ; for MAX9918,
CC
RS+
RS-
SENSE
RS+
RS-
SHDN
GND
REFIN CC L
A
= 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A = 20V/V, R2/R1 = 79kΩ/1kΩ; T = -40°C to +125°C, unless otherwise noted. Typical
V
V
A
values are at T = +25°C.) (Note 1)
A
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
±1.2
±3.3
±1.8
±1.8
±2.4
±8.8
MAX
UNITS
V
V
V
V
V
V
= V
= V
= V
= V
= V
= V
= +14V
= -2V
RS+
RS+
RS+
RS+
RS+
RS+
RS-
RS-
RS-
RS-
RS-
RS-
MAX9918
MAX9919_
MAX9920
= +14V
= -2V
Input Offset Voltage Drift
V
µV/°C
OSD
(Note 3)
= +14V
= -2V
Common-Mode Range
V
Inferred from CMRR tests
-20
80
96
72
86
+75
V
CM
-2V ≤ V
≤ +14V
CM
MAX9918,
MAX9919
-20V ≤ V
≤ +75V
CM
Common-Mode Rejection Ratio
(Note 3)
CMRR
dB
-2V ≤ V
≤ +14V
CM
MAX9920
-20V ≤ V
≤ +75V
CM
T
T
= +25°C
±175
±250
A
A
Input Bias Current
I
I
-20V ≤ V
≤ +75V
µA
µA
µA
RS+, RS-
CM
= -40°C to +125°C
Input Offset Current
(I
- I
)
0
±8
RS+ RS-
Input Leakage Current in
Shutdown
-20V ≤ V
≤ +75V, V
= V
= 5V
±30
±30
CM
SHDN
CC
Input Leakage Current
V
= V
= +14V, +75V, V = 0V
CC
µA
kΩ
Ω
RS+
RS-
Common mode
Differential
300
715
330
224
50
MAX9918,
MAX9919_
Input Resistance
Common mode
Differential
kΩ
Ω
MAX9920
MAX9918, MAX9919_
MAX9920
Full-Scale Sense Voltage
(Note 4)
Inferred from gain
error test
V
mV
V/V
V/V
SENSE
G
200
Adj
45
MAX9918, MAX9920
MAX9919F
Gain (Notes 2, 4)
MAX9919N
90
MAX9918
30
Minimum Adjustable Gain
G
ADJ
MAX9920
7.5
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Electrical Characteristics (continued)
(V
= 5V, V
= V
= +14V, V
= (V
- V
) = 0V, V
= V
= 0V, V
= V /2, R = 100kΩ; for MAX9918,
CC
RS+
RS-
SENSE
RS+
RS-
SHDN
GND
REFIN CC L
A
= 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A = 20V/V, R2/R1 = 79kΩ/1kΩ; T = -40°C to +125°C, unless otherwise noted. Typical
V
V A
values are at T = +25°C.) (Note 1)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
V
= +25°C,
REFIN
A
±0.08
±0.6
= 0V
V
= V
=
RS+
RS-
T
= -40°C to
+14V
A
±1.2
+125°C,
MAX9918
V
= 0V
REFIN
±0.02
±0.13
±0.10
±0.6
±1.0
±0.45
±1.2
±0.45
±0.9
±0.6
±1.2
±0.6
T
T
= +25°C
A
V
= V
=
RS+
RS-
-2V, V
= 0V
REFIN
= -40°C to
+125°C
A
T
T
= +25°C
A
V
= V
REFIN
=
RS+
RS-
+14V, V
= 0V
= -40°C to
A
+125°C
MAX9919F
MAX9919N
T
T
= +25°C
A
V
= V
=
RS+
RS-
-2V, V
= 0V
REFIN
= -40°C to
A
Gain Error
(Note 2)
GE
%
+125°C
±0.16
±0.11
T
T
= +25°C
A
V
= V
REFIN
=
RS+
RS-
+14V, V
= -40°C to
A
= 0V
+125°C
T
A
= +25°C
V
= V
REFIN
=
RS+
RS-
-2V, V
T
A
= -40°C to
±1.0
±1.0
±1.7
±1.0
±1.7
= 0V
+125°C
±0.29
±0.24
T
A
= +25°C
V
= V
REFIN
=
RS+
RS-
+14V, V
T
A
= -40°C to
= 0V
+125°C
MAX9920
T
T
= +25°C
A
V
= V
REFIN
=
RS+
RS-
-2V, V
= -40°C to
A
= 0V
+125°C
V
= 200mV for
SENSE
R = 100kΩ to GND
3
12
3
10
40
10
40
L
MAX9918, MAX9919_,
Output-Voltage High (Note 4)
Output-Voltage Low (Note 4)
V
- V
mV
mV
CC
OH
V
= 400mV for
SENSE
R = 10kΩ to GND
L
MAX9920
V
= -200mV for
SENSE
R = 100kΩ to V
L
CC
CC
MAX9918, MAX9919_,
= -400mV for
V
OL
V
SENSE
RL = 10kΩ to V
10
MAX9920
OUT shorted to V
44
41
CC
Short-Circuit Current
Output Resistance
I
mA
SC
OUT shorted to GND
R
0.1
Ω
OUT
V
1.9
-
-
MAX9918,
MAX9919_
CC
0
0
V
/2
CC
Inferred from REFIN
CMRR test
REFIN Voltage Range
V
V
CC
2.4
MAX9920
V
CC
/2
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Electrical Characteristics (continued)
(V
= 5V, V
= V
= +14V, V
= (V
- V
) = 0V, V
= V
= 0V, V
= V /2, R = 100kΩ; for MAX9918,
CC
RS+
RS-
SENSE
RS+
RS-
SHDN
GND
REFIN CC L
A
= 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A = 20V/V, R2/R1 = 79kΩ/1kΩ; T = -40°C to +125°C, unless otherwise noted. Typical
V
V
A
values are at T = +25°C.) (Note 1)
A
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
0V ≤ V
- 1.9V)
≤ (V
≤ (V
REFIN
CC
MAX9918, MAX9919_
82
103
REFIN Common-Mode Rejection
Ratio
REFIN
dB
CMRR
0V ≤ V
REFIN
CC
MAX9920
75
90
- 2.4V)
MAX9918, MAX9919_, V
= V
= ±50mV
±100
±100
RS+
RS-
REFIN Current
I
µA
REFIN
MAX9920, V
= V
= ±200mV
RS+
RS-
SHDN Logic-High
V
2.0
V
V
IH
SHDN Logic-Low
V
0.8
5
IL
SHDN Logic Input Current
Supply Voltage Range
0 ≤ V
≤ V
µA
V
SHDN
CC
V
Inferred from PSRR test
MAX9918, MAX9919_ 4.5V ≤ V
4.5
74
68
5.5
CC
≤ 5.5V
≤ 5.5V
103
100
0.7
Power-Supply Rejection Ratio
(Note 3)
CC
CC
PSRR
dB
MAX9920
4.5V ≤ V
T
= +25°C
1.2
1.5
1.6
2.2
10
A
V
= V
= V
= +14V
= -2V
RS+
RS-
T = -40°C to +125°C
A
Supply Current
I
mA
µA
CC
T
= +25°C
1.0
A
V
V
RS+
RS-
T = -40°C to +125°C
A
Shutdown Supply Current
Small Signal -3dB Bandwidth
I
= V = 5V
CC
0.5
75
250
120
230
0.6
0.9
3.0
1.5
12
7
CC_SHDN
SHDN
MAX9918, V
= 50mV
SENSE
MAX9919F, V
= 50mV
= 50mV
SENSE
BW
kHz
MAX9919N, V
SENSE
MAX9920, V
MAX9918
= 200mV
SENSE
MAX9919F
MAX9919N
MAX9920
Slew Rate
SR
V/µs
V
V
V
V
V
V
V
V
= 5mV to 50mV step
SENSE
SENSE
SENSE
SENSE
SENSE
SENSE
SENSE
SENSE
MAX9918
MAX9919F
MAX9919N
MAX9920
= 50mV to 5mV step
= 5mV to 50mV step
= 50mV to 5mV step
= 5mV to 50mV step
= 50mV to 5mV step
= 20mV to 200mV step
= 200mV to 20mV step
3.5
2.5
3.5
3
1% Settling Time from V
SENSE
Step
µs
5
3
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Electrical Characteristics (continued)
(V
= 5V, V
= V
= +14V, V
= (V
- V
) = 0V, V
= V
= 0V, V
= V /2, R = 100kΩ; for MAX9918,
CC
RS+
RS-
SENSE
RS+
RS-
SHDN
GND
REFIN CC L
A
= 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A = 20V/V, R2/R1 = 79kΩ/1kΩ; T = -40°C to +125°C, unless otherwise noted. Typical
V
V A
values are at T = +25°C.) (Note 1)
A
PARAMETERS
SYMBOL
CONDITIONS
MIN
TYP
2.5
0.5
2.5
0.5
3.5
3.5
0.25
2.5
4.5
5
MAX
UNITS
V
CM
V
CM
V
CM
V
CM
V
CM
V
CM
V
CM
V
CM
= -2V to +14V step
= +14V to -2V step
= -2V to +14V step
= +14V to -2V step
= -2V to +14V step
= +14V to -2V step
= -2V to +14V step
= +14V to -2V step
MAX9918,
= 50mV
V
SENSE
MAX9919F,
= 50mV
V
SENSE
1% Settling Time from VCM Step
µs
MAX9919N,
= 50mV
V
SENSE
MAX9920,
= 200mV
V
SENSE
MAX9918, V
= 50mV, 1% settling
SENSE
MAX9919F, V
= 50mV, 1% settling
= 50mV, 1% settling
SENSE
Power-Up Time
µs
MAX9919N, V
6
SENSE
MAX9920, V
= 200mV, 1% settling
5
SENSE
Max Capacitive Load Stability
No sustained oscillations (Note 5)
MAX9918, MAX9919_
MAX9920
50
pF
60
Input-Referred Noise Voltage
Density
e
n
10kHz
nV/√Hz
174
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.
A
Note 2: V
is extrapolated from two point gain error tests. Measurements are made at V
= 5mV and 50mV for MAX9918/
OS
SENSE
MAX9919N/MAX9919F, and V
= 20mV and 200mV for MAX9920.
SENSE
Note 3: Extrapolated V
as described above in Note 2 is used to calculate V
drift, CMRR, and PSRR.
OS
OS
Note 4: OUT should be 100mV away from either rail to achieve rated accuracy, or limited by a V
MAX9919N/MAX9919F and 200mV for the MAX9920.
of 50mV for the MAX9918/
SENSE
Note 5: Not production tested. Guaranteed by design.
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics
(V
= 5V, T = +25°C, unless otherwise noted.)
A
CC
V
V
DRIFT
= +14V)
V
OS
OS
= +14V)
OS
RS+
(V
(V
(V
= -2V)
RS+
RS+
0.30
0.25
0.20
0.15
0.10
0.05
0
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
-4 -3 -2 -1
0
1
2
3
4
-400 -320-240-160 -80
0
80 160 240 320 400
-400 -320-240-160 -80
0
80 160 240 320 400
OFFSET VOLTAGE (µV/°C)
OFFSET VOLTAGE (µV)
OFFSET VOLTAGE (µV)
V
DRIFT
= -2V)
OS
RS+
(V
V
OS
vs. V
CM
V
vs. V
OS CC
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0
500
400
300
200
100
0
125
100
75
T
= -40°C
A
T
A
= +25°C
V
= 14V
CM
50
25
0
-100
-200
-300
-400
-500
-25
-50
-75
-100
T
= +125°C
A
MAX9918ASA
V
= -2V
CM
MAX9918ASA
V
V
= 5V
CC
V
V
= 5V
CC
= V
REF
GND
= V
REF
GND
-10 -8 -6 -4 -2
0
2
4
6
8
10
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
(V)
-20 -10
0
10 20 30 40 50 60 70 80
(V)
OFFSET VOLTAGE (µV/°C)
V
V
CM
CC
GAIN ERROR
= +14V, MAX9919N, A = +90V/V)
GAIN ERROR
GAIN ERROR
(V
RS+
(V = -2V, MAX9919F, A = +45V/V)
RS+ V
(V
= +14V, MAX9919F, A = +45V/V)
V
V
RS+
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
GAIN ERROR (%)
GAIN ERROR (%)
GAIN ERROR (%)
Maxim Integrated
│ 8
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
GAIN ERROR
= -2V, MAX9919N, A = +90V/V)
V
GAIN ERROR vs. V
CM
(V
RS+
2.0
1.6
1.2
0.8
0.4
0
0.6
0.5
0.4
0.3
0.2
0.1
0
T
= +125°C
A
T
= +25°C
A
-0.4
-0.8
-1.2
-1.6
-2.0
T
= -40°C
A
MAX9918ASA
CC
V
V
= 5V
= V
REF
GND
-20 -10
0
10 20 30 40 50 60 70 80
(V)
-0.4 -0.3 -0.2 -0.1
0
0.1 0.2 0.3 0.4
V
GAIN ERROR (%)
CM
LINEARITY vs. V
GAIN ERROR vs. V
SENSE
CC
0.25
0.20
0.15
0.10
0.05
0
0.5
0.4
0.3
0.2
0.1
0
V
V
V
A
= -2V
= 5V
REFIN
= 90V/V
CM
CC
= V /2
CC
V
T
= -40°C
= +25°C
A
BIDIRECTIONAL
V
= -2V
CM
-0.05
-0.10
-0.15
-0.20
-0.25
-0.1
-0.2
-0.3
-0.4
-0.5
T
= +125°C
A
T
A
V
CM
= 14V
5.1
-30
-20
-10
0
10
20
30
4.5
4.7
4.9
5.3
5.5
V
(mV)
V
(V)
SENSE
CC
LINEARITY vs. V
LINEARITY vs. V
SENSE
SENSE
0.10
0.08
0.06
0.04
0.02
0
0.10
0.08
0.06
0.04
0.02
0
V
V
V
A
= +14V
V
V
= -2V
CM
CC
CM
= 5V
= V /2
= 5V
CC
V
A
= V
REFIN
CC
REFIN
GND
= 90V/V
= 90V/V
V
V
T = -40°C
A
T
A
= +25°C
BIDIRECTIONAL
UNIDIRECTIONAL
T
A
= +25°C T = -40°C
A
-0.02
-0.04
-0.06
-0.08
-0.10
-0.02
-0.04
-0.06
-0.08
-0.10
T
= +125°C
T
= +125°C
A
A
0
10 20 30 40 50 60 70 80
(mV)
-30
-20
-10
0
10
20
30
V
V
(mV)
SENSE
SENSE
Maxim Integrated
│ 9
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
LINEARITY vs. V
SENSE
LINEARITY vs. V
SENSE
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
0.25
0.20
0.15
V
V
V
A
= +14V
= 5V
CM
V
V
V
A
= -2V
= 5V
REFIN
CM
CC
CC
= V
REFIN
GND
= V /2
CC
= 90V/V
UNIDIRECTIONAL
V
= 30V/V
V
T
= +25°C
0.10
0.05
A
BIDIRECTIONAL
T
= -40°C
A
T
= +25°C
A
0
-0.05
-0.10
-0.15
-0.20
T
= -40°C
A
T
= +125°C
A
-0.02
-0.04
-0.06
-0.08
-0.10
T
A
= +125°C
-0.25
0
5 10 15 20 25 30 35 40 45 50 55 60 65 70
(mV)
-100 -80 -60 -40 -20
0
20 40 60 80 100
(mV)
V
SENSE
V
SENSE
LINEARITY vs. V
SENSE
V
- V vs. V
OUT REFIN SENSE
0.10
0.08
0.06
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
V
V
A
= +14V
= 5V
REFIN
CM
CC
-2V V : SOLID LINE
CM
14V V : DASHED LINE
CM
= V /2
CC
T
= -40°C
A
= 30V/V
T
= +125°C
= +25°C
V
A
0.04
0.02
BIDIRECTIONAL
0
-0.02
-0.04
-0.06
-0.08
T
A
MAX9918, V
= 0V
REFIN
UNIDIRECTIONAL,
GAIN = 90V/V
-0.5
-1.0
-0.10
-100 -80 -60 -40 -20
0
20 40 60 80 100
-20 -10
0
10 20 30 40 50 60 70 80
V
(mV)
SENSE
V
(mV)
SENSE
V
- V
vs. V
SENSE
OUT REFIN
V
/V vs. I
OH
OH OL
3.0
2.5
2.0
1.5
1.0
0.5
0
350
300
250
200
150
100
50
-2V V : SOLID LINE
CM
V
= +14V
CM
14V V : DASHED LINE
CM
V - V
CC OH
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
MAX9918, V
= V /2
CC
REFIN
V
OL
7
BIDIRECTIONAL,
GAIN = 90V/V
0
-40 -30 -20 -10
0
10 20 30 40
(mV)
0
1
2
3
4
5
6
8
9
10
V
SENSE
I
(mA)
OH
Maxim Integrated
│ 10
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
I
vs.V
I
vs. V
CC
CM
I
vs. V
CC
CC
BIAS CM
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
0.5
0.4
1.0
100
80
V
= 0V (DASH)
SENSE
T
= +125°C
A
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
V
+ 50mV (SOLID)
SENSE
60
V
= -2V
= 14V
40
CM
CM
20
T
= +25°C
= -40°C
T
A
A
0
V
-20
-40
-60
-80
-100
MAX9918
V = 5V
CC
V
= 0V
SENSE
-20 -10
0
10 20 30 40 50 60 70 80
(V)
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
(V)
-20 -10
0
10 20 30 40 50 60 70 80
(V)
V
V
CM
V
CM
CC
INPUT LEAKAGE CURRENT vs. V
DIFFERENTIAL R vs. V
IN CM
GAIN vs. FREQUENCY
CM
20
15
10
5
0
1000
900
800
700
600
500
400
300
200
100
0
50
40
30
20
10
0
T
A
= +25°C
T
A
= -40°C
-5
-10
-15
-20
-25
-30
-35
-40
-45
-50
T
A
= +125°C
-10
-20
-30
-40
IN+ - IN- = 50mV
MAX9918
= 14V
V
V
= V
= 0V
CC
SHDN
V
CM
= 0V
REFIN
GAIN = 90V/V
0.001 0.01
FREQUENCY (MHz)
-20
0
20
40
(V)
60
80
-20
-5
10
25
(V)
40
55
70
0.1
1
10
V
V
CM
CM
CMRR vs. FREQUENCY
MAX9918
GAIN vs. FREQUENCY
PSRR vs. FREQUENCY
10
0
40
30
0
-20
MAX9918
V
= 14V
V
V
= 14V
= 50mV
CM
CM
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
GAIN = 90V/V
SENSE
20
-40
10
0
-60
-10
-20
-30
-40
-50
-60
-80
V
CM
= -2V
-100
-120
-140
MAX9920
= 14V
V
CM
V
CM
= 14V
GAIN = 20V/V
0.001 0.01
FREQUENCY (MHz)
0.001
0.01
0.1
1
10
100
0.1
1
10
0.0001 0.001 0.01 0.1
1
10 100 1k 10k
FREQUENCY (MHz)
FREQUENCY (kHz)
Maxim Integrated
│ 11
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
SMALL-SIGNAL TRANSIENT
(GAIN = 45V/V)
SMALL-SIGNAL TRANSIENT
(GAIN = 90V/V)
MAX9918 toc31
MAX9918 toc32
5mV/div
5mV/div
MAX9918, V = 14V
CM
MAX9918, V = 14V
CM
100mV/div
50mV/div
V
= 10mV TO 15mV
SENSE
V
= 10mV TO 15mV
SENSE
10µs/div
10µs/div
LARGE-SIGNAL TRANSIENT
(GAIN = 45V/V)
LARGE-SIGNAL TRANSIENT
(GAIN = 90V/V)
MAX9918 toc33
MAX9918 toc34
50mV/div
50mV/div
MAX9918, V = 14V
CM
MAX9918, V = 14V
CM
500mV/div
1V/div
V
= 0V TO 50mV
SENSE
V
= 0 TO 50mV
SENSE
10µs/div
10µs/div
OUTPUT RESPONSE TO
COMMON-MODE STEP RESPONSE
COMMON-MODE TRANSIENT
MAX9918 toc35
MAX9918 toc36
MAX9918, V = 14V
CM
S
= PS (50mV)
SENSE
V
CM
50V/div
10V/div
1V/div
0
V
OUT
100mV/div
OUTPUT AC-COUPLED
FULL SCALE
AT THE INPUT
10µs/div
4µs/div
Maxim Integrated
│ 12
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(V
= 5V, T = +25°C, unless otherwise noted.)
CC
A
POWER-UP TIME
SHUTDOWN ON/OFF DELAY
MAX9918 toc38
MAX9918 toc37
5V/div
5V/div
2V/div
1V/div
MAX9918, V = 14V
CM
MAX9918, V = 14V
CM
V
= PS (50mV)
V
= PS (50mV)
SENSE
SENSE
4µs/div
4µs/div
OUTPUT OVERDRIVE
RECOVERY (30V/V)
OUTPUT OVERDRIVE
RECOVERY (90V/V)
MAX9918 toc39
MAX9918 toc40
MAX9918, V = 14V
CM
V
= 2 x PS
SENSE
200mV/div
50mV/div
2V/div
2V/div
MAX9918, V = 14V
CM
V
= 2 x PS
SENSE
4µs/div
4µs/div
Maxim Integrated
│ 13
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Pin Configuration
TOP VIEW
+
RS+
RS-
1
2
3
4
8
7
6
5
V
CC
MAX9918
MAX9919
MAX9920
REFIN
FB
SHDN
GND
EP*
OUT
8 SO-EP
*EXPOSED PAD. CONNECT EP TO SOLID GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE.
Pin Description
PIN
1
NAME
RS+
FUNCTION
Positive Current-Sensing Input. Power side connects to external sense resistor.
Negative Current-Sensing Input. Load side connects to external sense resistor.
Active-High Shutdown Input. Connect to GND for normal operation.
Ground
2
RS-
3
SHDN
GND
OUT
4
5
Current-Sense Output. V
is proportional to V
.
SENSE
OUT
Feedback Input. Connect FB to a resistive-divider network to set the gain for the MAX9918 and
MAX9920. See the Adjustable Gain (MAX9918/MAX9920) section for more information. Leave FB
unconnected for the MAX9919 for proper operation.
6
FB
Reference Input. Set REFIN to V /2 for bidirectional operation. Set REFIN to GND for
CC
unidirectional operation.
7
REFIN
8
V
5V Supply Voltage Input. Bypass V
to GND with 0.1µF capacitor.
CC
CC
Exposed Pad. Connect to a large-area contiguous ground plane for improved power dissipation.
Do not use as the only ground connection for the part.
—
EP
The level shifters translate V
to an internal refer-
SENSE
Detailed Description
ence voltage where it is then amplified with an instrumen-
tation amplifier. The instrumentation amplifier configura-
tion provides high precision with input offset voltages of
400µV (max). Indirect feedback of the instrumentation
amplifier allows the gain to be adjusted with an external
resistive-divider network on the MAX9918/MAX9920.
The MAX9919 is a fixed gain device available with laser-
trimmed resistors for gains of 45V/V (MAX9919F) and
90V/V (MAX9919N).
The MAX9918/MAX9919/MAX9920 are single-supply,
high-accuracy uni-/bidirectional current-sense amplifi-
ers with a high common-mode input range that extends
from -20V to +75V. The MAX9918/MAX9919/MAX9920’s
input stage utilizes a pair of level shifters allowing a wide
common-mode operating range when measuring the volt-
age drop (V
) across the current-sense resistor. The
SENSE
first level shifter accommodates the upper common-mode
operating range from +2V to +75V. When the common-
mode voltage falls below +2V, the second level shifter is
used to accommodate negative voltages down to -20V.
The MAX9918/MAX9919 operate with a full-scale sense
voltage of 50mV. The input stage of the MAX9920 pro-
vides an attenuation factor of 4, enabling a full-scale
sense voltage of 200mV.
Maxim Integrated
│ 14
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
The MAX9918/MAX9919 operate in bidirectional mode
by application of a low-source impedance reference volt-
Uni-/Bidirectional Operation
The MAX9918/MAX9919/MAX9920 support both unidi-
rectional and bidirectional operation. The devices operate
age in the 0V to V
- 1.9V range, (typically V /2), to
CC
CC
REFIN. For the MAX9920, the reference voltage range
in unidirectional mode with V
= V
. The output
REFIN
GND
is 0V to V - 2.4V (typically V /2). The output volt-
CC
CC
is then referenced to ground and the output voltage V
is proportional to the positive voltage drop (V
RS+ to RS- (Figure 1).
OUT
age V
relative to V
is then proportional to the
OUT
REFIN
) from
SENSE
±V
voltage drop from RS+ to RS- (Figure 2).
SENSE
V
OUT
3.6V
2.7V
1.8V
0.9V
G = 90V/V
I
DISCHARGE
R
SENSE
RS+
RS-
LOAD
DISCHARGE
CURRENT
MAX9919N
V
TO ADC
OUT
5V
CC
SHDN
REFIN
GND
V
SENSE
0
10mV
40mV
20mV
30mV
Figure 1. Unidirectional Operation
V
- V
REFIN
OUT
G = 90V/V
1.8V
I
I
CHARGE
DISCHARGE
R
SENSE
DISCHARGE
CURRENT
0.9V
RS+
RS-
LOAD
MAX9919N
V
SENSE
-20mV
-10mV
10mV
0
20mV
V
TO ADC
2.5V
OUT
5V
CC
CHARGE
CURRENT
SHDN
REFIN
-0.9V
GND
-1.8V
Figure 2. Bidirectional Operation
Maxim Integrated
│ 15
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Shutdown Mode
Sense Resistor, R
SENSE
Drive SHDN high to enter low-power shutdown mode. In
shutdown mode, the MAX9918/MAX9919/MAX9920 draw
0.5µA (typ) of quiescent current.
Choose R
based on the following criteria:
SENSE
Accuracy: A high R
to be measured more accurately. This is because off-
value allows lower currents
SENSE
sets become less significant when the sense voltage
Adjustable Gain (MAX9918/MAX9920)
is larger. In the linear region (100mV < V
< V
CC
OUT
The MAX9918/MAX9920 feature externally adjustable
gain set by a resistive-divider network circuit using resis-
tors R1 and R2 (see the Functional Diagram). The gain
frequency compensation is set for a minimum gain of
30V/V for the MAX9918 and 7.5V/V for the MAX9920.
The gain G for the MAX9918/MAX9920 is given by the
following equation:
- 100mV), there are two components to accuracy: input
offset voltage (V ) and gain error (GE). Use the linear
OS
equation to calculate total error:
V
= (G ± GE) x (V
± V )
OS
OUT
SENSE
For best performance, select R
to provide approxi-
SENSE
mately 50mV (MAX9918/MAX9919) or 200mV (MAX9920)
of sense voltage for the full-scale current in each applica-
tion. Sense resistors of 5mΩ to 100mΩ are available with
1% accuracy or better.
R2
R1
G = 1+
(for MAX9918)
and
Efficiency and Power Dissipation
At high current levels, the I R losses in R
significant. Take this into consideration when choosing the
resistor value and its power dissipation (wattage) rating.
Also, the sense resistor’s value might drift if it is allowed to
R2
1+
2
can be
SENSE
R1
G =
(for MAX9920)
4
heat up excessively. The precision V
MAX9919/MAX9920 allows the use of small sense resis-
of the MAX9918/
OS
Applications Information
tors to reduce power dissipation and reduce hot spots.
Component Selection
Inductance: Keep inductance low if I
high-frequency component by using resistors with low
inductance value.
has a large
Ideally, the maximum load current develops the full-scale
sense voltage across the current-sense resistor. Choose
the gain needed to yield the maximum output voltage
required for the application:
SENSE
Power-Supply Bypassing and Grounding
Bypass the MAX9918/MAX9919/MAX9920’s V
ground with a 0.1µF capacitor. Grounding these devices
requires no special precautions; follow the same caution-
ary steps that apply to the rest of the system. High-current
systems can experience large voltage drops across a
ground plane, and this drop may add to or subtract from
V
OUT
= V
x G
SENSE
to
CC
where V
is the full-scale sense voltage, 50mV for
SENSE
the MAX9918/MAX9919, or 200mV for the MAX9920 and
G is the gain of the device. G is externally adjustable for
the MAX9918/MAX9920. The MAX9919 has a fixed gain
version of 45V/V (MAX9919F) or 90V/V (MAX9919N).
V
. Using a differential measurement between OUT
OUT
In unidirectional applications (V
= 0V), select the
REFIN
and REFIN prevents this problem. For highest current-
measurement accuracy, use a single-point star ground.
Connect the exposed pad to a solid ground to ensure
optimal thermal performance.
gain of the MAX9918/MAX9920 to utilize the full output
range between GND and V . In bidirectional applica-
CC
tions (V
= V /2), select the gain to allow an output
REFIN
CC
voltage range of ±V /2. V
must be at least 100mV
CC
OUT
from either rail to achieve the rated gain accuracy.
Maxim Integrated
│ 16
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Functional Diagram
V
CC
MAX9919F
OUT
A
R2
FB
RS+
INPUT
50mV (typ)
R
SENSE
INPUT STAGE/
LEVEL SHIFTER
R1
RS-
REFIN
I
LOAD
FIXED GAIN
G = 45V/V OR 90V/V
SHDN
GND
V
CC
MAX9918
MAX9920
OUT
FB
A
R2
R1
RS+
MAX9918
50mV (typ)
INPUT
INPUT STAGE/
LEVEL SHIFTER
R
SENSE
RS-
MAX9920
REFIN
200mV (typ)
I
LOAD
ADJUSTABLE GAIN
SHDN
GND
GAIN IS SET BY EXTERNAL RESISTORS, R1 AND R2
G = [1+(R2/R1)] FOR MAX9918
G = [1+(R2/R1)]/4 FOR MAX9920
Chip Information
PROCESS: BiCMOS
Maxim Integrated
│ 17
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
LAND PATTERN NO.
8 SO-EP
S8E+14
21-0111
90-0151
Maxim Integrated
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MAX9918/MAX9919/MAX9920
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
10/09
1/10
0
1
2
Initial release
—
16
1
Updated Functional Diagram
Added automotive qualified part
12/10
3
4
5
6
6/11
7/11
1/13
1/15
Added MAX9920ASA/V+ to data sheet
1
Added automotive qualified parts for the MAX9919NASA/V+ and the MAX9920ASA/V+
Added automotive qualified part for the MAX9919FASA/V+
1
1
1
Updated Applications and Benefits and Features section
Added Junction-to-Case Thermal Resistance specification to Package Thermal
Characteristics section
7
1/17
2
8
9
9/17
2/19
7/19
Added AEC-Q100 qualification statement to Benefits and Features section
Updated Applications, Benefits and Features, and added Package Information
Updated TOC29
1
1, 2
11
10
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2019 Maxim Integrated Products, Inc.
│ 19
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