MAX9920ASA+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX9920ASA+
-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers
MAX9918/MAX9919/MAX9920-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
EVALUATION KIT AVAILABLE
General Description
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.
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
operate as unidirectional amplifiers when VREFIN= GND
and as bidirectional amplifiers when VREFIN= VCC/2.
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).
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.
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
Benefits and FeaturesReduce Protective Clamping for High Inductive
Kickback Voltage-20V to +75V Input Common-Mode Voltage RangeSupports Wide Range of Precision AC and DC
Current Sensing ApplicationsUni- or Bidirectional Current Sensing0.6% (max) Gain Accuracy Error400µV (max) Input Offset Voltage120kHz, -3dB Bandwidth (MAX9919N)Reference Input for Bidirectional OUTRail-to-Rail OutputSaves Board Space8-Pin SOIC PackageSingle-Supply Operation (4.5V to 5.5V)
φ2B
φ1B
ADC
REF
INPUT STAGE
LEVEL SHIFTER
RSENSE
VBATT
ADJUSTABLE GAIN
VCCVCC
RS+
RS-
OUT
REFIN
GNDGNDSHDN
φ2B
φ1AMAX9918
MAX9920
Typical Operating Circuit
Ordering Information/
Selector Guide
PARTVSENSE
(mV)
GAIN
(V/V)
PIN-
PACKAGE
MAX9918ASA+±50Adjustable8 SO-EP*
MAX9918ASA/V+±50Adjustable8 SO-EP*
MAX9919FASA+±50458 SO-EP*
MAX9919FASA/V+±50458 SO-EP*
MAX9919NASA+±50908 SO-EP*
MAX9919NASA/V+±50908 SO-EP*
MAX9920ASA+±200Adjustable8 SO-EP*
MAX9920ASA/V+±200Adjustable8 SO-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.
MAX9918/MAX9919/MAX9920-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= 5V, VRS+= VRS-= +14V, VSENSE= (VRS+- VRS-) = 0V, VSHDN= VGND= 0V, VREFIN= VCC/2, RL= 100kΩ; for MAX9918, AV=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, AV= 20V/V, R2/R1 = 79kΩ/1kΩ; TA= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
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.
VCCto GND..............................................................-0.3V to +6V
RS+, RS- to GND (VCC= 5V)..................................-30V to +80V
RS+, RS- to GND (VCC= 0V).............-15V to +80V (15 minutes)
Differential Input Voltage (VRS+- VRS-)
(MAX9918/MAX9919).................................±15V (Continuous)
Differential Input Voltage
(VRS+- VRS-) (MAX9920).............................±5V (Continuous)
REFIN, FB, OUT to GND.............................-0.3V to (VCC+ 0.3V)
SHDN to GND.........................................................-0.3V to +20V
Output Short Circuit to VCCor GND...........................Continuous
Continuous Current into Any Pin
(Not to exceed package power dissipation)................±20mA
Continuous Power Dissipation (TA= +70°C)
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
PACKAGE THERMAL CHARACTERISTICS (Note 1)
SO-EP
Junction-to-Ambient Thermal Resistance (θJA)...........41°C/W
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TA = +25°C±0.14±0.4VRS+ = VRS- =
+14V, VREFIN
= 0V
TA = -40°C
to +125°C±0.7
TA = +25°C±0.08±0.4MAX9918
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C
to +125°C±1.3
TA = +25°C±0.18±0.4VRS+ = VRS- =
+14V, VREFIN
= 0V
TA = -40°C
to +125°C±0.9
TA = +25°C±0.11±0.4MAX9919_
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C
to +125°C±1.0
TA = +25°C±0.48±1.2VRS+ = VRS- =
+14V, VREFIN
= 0V
TA = -40°C
to +125°C±3.0
TA = +25°C±0.10±0.9
Input Offset Voltage (Note 2)VOS
MAX9920
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C
to +125°C±3.5
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.
**As per JEDEC51 Standard (multilayer board).
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
MAX9918/MAX9919/MAX9920
PARAMETERSSYMBOLCONDITIONSMINTYPMAXUNITS
VRS+ = VRS- = +14V±1.2MAX9918VRS+ = VRS- = -2V±3.3
VRS+ = VRS- = +14V±1.8MAX9919_VRS+ = VRS- = -2V±1.8
VRS+ = VRS- = +14V±2.4
Input Offset Voltage Drift
(Note 3)VOSD
MAX9920VRS+ = VRS- = -2V±8.8
μV/°C
Common-Mode RangeVCMInferred from CMRR tests-20+75V
-2V ≤ VCM ≤ +14V80M AX 9918, M AX 9919-20V ≤ VCM ≤ +75V96
-2V ≤ VCM ≤ +14V72
Common-Mode Rejection Ratio
(Note 3)CMRR
MAX9920-20V ≤ VCM ≤ +75V86
TA = +25°C±175Input Bias CurrentIRS+, IRS--20V ≤ VCM ≤ +75VTA = -40°C to +125°C±250μA
Input Offset Current( IRS + - IRS - ) 0±8μA
Input Leakage Current in
Shutdown-20V ≤ VCM ≤ +75V, VSHDN = VCC = 5V±30μA
Input Leakage CurrentVRS+ = VRS- = +14V, +75V, VCC = 0V±30μA
Common mode300kΩMAX9918,
MAX9919_Differential715Ω
Common mode330kΩInput Resistance
MAX9920Differential224Ω
MAX9918, MAX9919_50Full-Scale Sense Voltage (Note 4)VSENSEInferred from gain
error testMAX9920200mV
MAX9918, MAX9920Adj
MAX9919F45Gain (Notes 2, 4)G
MAX9919N90
V/V
MAX991830Minimum Adjustable GainGADJMAX99207.5V/V
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V, VRS+= VRS-= +14V, VSENSE= (VRS+- VRS-) = 0V, VSHDN= VGND= 0V, VREFIN= VCC/2, RL= 100kΩ; for MAX9918, AV=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, AV= 20V/V, R2/R1 = 79kΩ/1kΩ; TA= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
MAX9918/MAX9919/MAX9920-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V, VRS+= VRS-= +14V, VSENSE= (VRS+- VRS-) = 0V, VSHDN= VGND= 0V, VREFIN= VCC/2, RL= 100kΩ; for MAX9918, AV=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, AV= 20V/V, R2/R1 = 79kΩ/1kΩ; TA= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
TA = +25°C,
VREFIN = 0V±0.08±0.6
VRS+ = VRS- =
+14VTA = -40°C to
+125°C,
VREFIN = 0V
±1.2
TA = +25°C±0.02±0.6
MAX9918
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C to
+125°C±1.0
TA = +25°C±0.13±0.45VRS+ = VRS- =
+14V, VREFIN =
TA = -40°C to
+125°C±1.2
TA = +25°C±0.10±0.45MAX9919FVRS+ = VRS- =
-2V, VREFIN =
TA = -40°C to
+125°C±0.9
TA = +25°C±0.16±0.6VRS+ = VRS- =
+14V, VREFIN =
TA = -40°C to
+125°C±1.2
TA = +25°C±0.11±0.6MAX9919N
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C to
+125°C±1.0
TA = +25°C±0.29±1.0VRS+ = VRS- =
+14V, VREFIN =
TA = -40°C to
+125°C±1.7
TA = +25°C±0.24±1.0
Gain Error
(Note 2)GE
MAX9920
VRS+ = VRS- =
-2V, VREFIN =
TA = -40°C to
+125°C±1.7
FB Input Bias CurrentIFBMAX9918, MAX9920515nA
RL = 100kΩ to GND310
Output-Voltage High (Note 4)VCC - VOH
VSENSE = 200mV for
MAX9918, MAX9919_,
VSENSE = 400mV for
MAX9920RL = 10kΩ to GND1240
RL = 100kΩ to VCC310
Output-Voltage Low (Note 4)VOL
VSENSE = -200mV for
MAX9918, MAX9919_,
VSENSE = -400mV for
MAX9920RL = 10kΩ to VCC1040
OUT shorted to VCC44Short-Circuit CurrentISCOUT shorted to GND41mA
Output ResistanceROUT0.1ΩAX 9918, M AX9919_0VCC
VCC -
REFIN Voltage RangeInferred from REFIN
CMRR testMAX99200VCC
VCC -
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
MAX9918/MAX9919/MAX9920
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V, VRS+= VRS-= +14V, VSENSE= (VRS+- VRS-) = 0V, VSHDN= VGND= 0V, VREFIN= VCC/2, RL= 100kΩ; for MAX9918, AV=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, AV= 20V/V, R2/R1 = 79kΩ/1kΩ; TA= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
PARAMETERSSYMBOLCONDITIONSMINTYPMAXUNITS
MAX9918, MAX9919_0V ≤ VREFIN ≤ (VCC
- 1.9V)82103
REFIN Common-Mode Rejection
RatioRE FIN C M R R
MAX99200V ≤ VREFIN ≤ (VCC
- 2.4V)7590AX 9918, M AX 9919_, V RS + = V RS - = ± 50m V ±100REFIN CurrentIREFINMAX9920, VRS+ = VRS- = ±200mV±100μA
SHDN Logic-HighVIH2.0V
SHDN Logic-LowVIL0.8V
SHDN Logic Input Current0 ≤ VSHDN ≤ VCC5μA
Supply Voltage RangeVCCInferred from PSRR test4.55.5V
MAX9918, MAX9919_4.5V ≤ VCC ≤ 5.5V74103Power-Supply Rejection Ratio
(Note 3)PSRRMAX99204.5V ≤ VCC ≤ 5.5V68100dB
TA = +25°C0.71.2VRS+ = VRS- = +14VTA = - 40°C to + 125°C 1.5
TA = +25°C1.01.6Supply CurrentICC
VRS+ = VRS- = -2VTA = - 40°C to + 125°C 2.2
Shutdown Supply CurrentICC_SHDNVSHDN = VCC = 5V0.510μA
MAX9918, VSENSE = 50mV75
MAX9919F, VSENSE = 50mV250
MAX9919N, VSENSE = 50mV120Small Signal -3dB BandwidthBW
MAX9920, VSENSE = 200mV230
kHz
MAX99180.6
MAX9919F0.9
MAX9919N3.0Slew RateSR
MAX99201.5
V/μs
VSENSE = 5mV to 50mV step12MAX9918VSENSE = 50mV to 5mV step7
VSENSE = 5mV to 50mV step3.5MAX9919FVSENSE = 50mV to 5mV step2.5
VSENSE = 5mV to 50mV step3.5MAX9919NVSENSE = 50mV to 5mV step3S E N S E = 20m V to 200m V step 5
1% Settling Time from VSENSE
Step
MAX9920V S E N S E = 200m V to 20m V step 3
MAX9918/MAX9919/MAX9920-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 5V, VRS+= VRS-= +14V, VSENSE= (VRS+- VRS-) = 0V, VSHDN= VGND= 0V, VREFIN= VCC/2, RL= 100kΩ; for MAX9918, AV=
90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, AV= 20V/V, R2/R1 = 79kΩ/1kΩ; TA= -40°C to +125°C, unless otherwise noted. Typical val-
ues are at TA= +25°C.) (Note 1)
PARAMETERSSYMBOLCONDITIONSMINTYPMAXUNITS
VCM = -2V to +14V step2.5MAX9918,
VSENSE = 50mVVCM = +14V to -2V step0.5
VCM = -2V to +14V step2.5MAX9919F,
VSENSE = 50mVVCM = +14V to -2V step0.5
VCM = -2V to +14V step3.5MAX9919N,
VSENSE = 50mVVCM = +14V to -2V step3.5
VCM = -2V to +14V step0.25
1% Settling Time from VCM Step
MAX9920,
VSENSE = 200mVVCM = +14V to -2V step2.5
MAX9918, VSENSE = 50mV, 1% settling4.5
MAX9919F, VSENSE = 50mV, 1% settling5
MAX9919N, VSENSE = 50mV, 1% settling6Power-Up Time
MAX9920, VSENSE = 200mV, 1% settling5
Max Capacitive Load StabilityNo sustained oscillations (Note 5)50pF
MAX9918, MAX9919_60Input-Referred Noise Voltage
Densityen10kHzMAX9920174nV/√Hz
Note 1:All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2:VOSis extrapolated from two point gain error tests. Measurements are made at VSENSE= 5mV and 50mV for
MAX9918/MAX9919N/MAX9919F, and VSENSE= 20mV and 200mV for MAX9920.
Note 3:Extrapolated VOSas described above in Note 2 is used to calculate VOSdrift, CMRR, and PSRR.
Note 4:OUT should be 100mV away from either rail to achieve rated accuracy, or limited by a VSENSEof 50mV for the
MAX9918/MAX9919N/MAX9919F and 200mV for the MAX9920.
Note 5:Not production tested. Guaranteed by design.
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
MAX9918/MAX9919/MAX9920
Typical Operating Characteristics
(VCC= 5V, TA= +25°C, unless otherwise noted.)
VOS
(VRS+ = +14V)
MAX9918 toc01
OFFSET VOLTAGE (FV)
N (%)
VOS DRIFT
(VRS+ = +14V)
MAX9918 toc02
OFFSET VOLTAGE (FV/°C)
N (%)210-1-2-3
VOS
(VRS+ = -2V)
MAX9918 toc03
OFFSET VOLTAGE (FV)
N (%)
VOS DRIFT
(VRS+ = -2V)
MAX9918 toc04
OFFSET VOLTAGE (FV/°C)
N (%)46-6-4-202-8
VOS vs. VCM
MAX9918 toc05
VCM (V)
(uV)6040500102030-10
TA = -40°C
TA = +25°C
MAX9918ASA
VCC = 5V
VREF = VGND
TA = +125°C
VOS vs. VCC
MAX9918 toc06
VCC (V)
VOS (
MAX9918ASA
VCC = 5V
VREF = VGND
VCM = -2V
VCM = 14V0.10.20.3-0.4-0.3-0.2-0.10.4
GAIN ERROR
(VRS+ = +14V, MAX9919F, AV = +45V/V)
MAX9918 toc07
GAIN ERROR (%)
N (%)
GAIN ERROR (%)
MAX9918 toc08
N (%)
GAIN ERROR
(VRS+ = +14V, MAX9919N, AV = +90V/V)0.10.20.3-0.4-0.3-0.2-0.10.4
GAIN ERROR
(VRS+ = -2V, MAX9919F, AV = +45V/V)
MAX9918 toc09
GAIN ERROR (%)
N (%)
0.6
MAX9918/MAX9919/MAX9920-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(VCC= 5V, TA= +25°C, unless otherwise noted.)0.10.20.3-0.4-0.3-0.2-0.10.4
GAIN ERROR
(VRS+ = -2V, MAX9919N, AV = +90V/V)
MAX9918 toc10
GAIN ERROR (%)
N (%)
GAIN ERROR vs. VCM
MAX9918 toc11
VCM (V)
GE (%)6040500102030-10
MAX9918ASA
VCC = 5V
VREF = VGND
TA = +125NC
TA = +25NC
TA = -40NC
GAIN ERROR vs. VCC
MAX9918 toc12
VCC (V)
GAIN ERROR (%)
VCM = -2V
VCM = 14V
LINEARITY vs. VSENSE
MAX9918 toc13
LINEARITY (%)100-10-20
VCM = -2V
VCC = 5V
VREFIN = VCC/2
AV = 90V/V
BIDIRECTIONALTA = -40°C
VSENSE (mV)
TA = +25°C
TA = +125°C
LINEARITY vs. VSENSE
MAX9918 toc14
LINEARITY (%)100-10-20
VCM = +14V
VCC = 5V
VREFIN = VCC/2
AV = 90V/V
BIDIRECTIONALTA = -40°CTA = +25°C
TA = +125°C
VSENSE (mV)
LINEARITY vs. VSENSE
MAX9918 toc15
LINEARITY (%)604050203010080
VCM = -2V
VCC = 5V
VREFIN = VGND
AV = 90V/V
UNIDIRECTIONALTA = -40°CTA = +25°C
TA = +125°C
VSENSE (mV)
-20V to +75V Input Range,
Precision Uni-/Bidirectional,
Current-Sense Amplifiers
MAX9918/MAX9919/MAX9920
Typical Operating Characteristics (continued)
(VCC= 5V, TA= +25°C, unless otherwise noted.)
VOUT - VREFIN vs. VSENSE
MAX9918 toc19
OUT
- V
REFIN
(V)6040500102030-10
MAX9918, VREFIN = 0V
UNIDIRECTIONAL,
GAIN = 90V/V
-2V VCM: SOLID LINE
14V VCM: DASHED LINE
VSENSE (mV)
VOUT - VREFIN vs. VSENSE
MAX9918 toc20
VSENSE (mV)
OUT
- V
REFIN
(V)20010-20-10-30
MAX9918, VREFIN = VCC/2
BIDIRECTIONAL,
GAIN = 90V/V
-2V VCM: SOLID LINE
14V VCM: DASHED LINE
VOH/VOL vs. IOH
MAX9918 toc21
IOH (mA)
AND V
(mV)87654321
VCC - VOH
VCM = +14V
VOL
LINEARITY vs. VSENSE
MAX9918 toc16
VSENSE (mV)
LINEARITY (%)60554045501015202530355
VCM = +14V
VCC = 5V
VREFIN = VGND
AV = 90V/V
UNIDIRECTIONAL
TA = -40°C
TA = +25°C
TA = +125°C
LINEARITY vs. VSENSE
MAX9918 toc17
VSENSE (mV)
LINEARITY (%)6002040-60-40-20-80
VCM = -2V
VCC = 5V
VREFIN = VCC/2
AV = 30V/V
BIDIRECTIONALTA = +25°C
TA = +125°CTA = -40°C
LINEARITY vs. VSENSE
MAX9918 toc18
VSENSE (mV)
LINEARITY (%)6002040-60-40-20-80-100100
VCM = +14V
VCC = 5V
VREFIN = VCC/2
AV = 30V/V
BIDIRECTIONAL
TA = +25°C
TA = +125°CTA = -40°C

Partno	Mfg	Dc	Qty	Available	Descript
MAX9920ASA+	MAX	N/a	10	avai	-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers