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PDF MAX9920 Data sheet ( Hoja de datos )
| Número de pieza | MAX9920 | |
| Descripción | (MAX9918 - MAX9920) Current-Sense Amplifiers | |
| Fabricantes | Maxim Integrated Products | |
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19-5015; Rev 0; 11/09
EVAALVUAAILTAIOBNLEKIT
-20V to +75V Input Range, Precision
Uni-/Bidirectional, Current-Sense Amplifiers
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 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.
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-
ate 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 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.
Applications
H-Bridge Motor Current Sensing
Solenoid Current Sensing
Current Monitoring of Inductive Loads
High- and Low-Side Precision Current Sensing
www.DataSheet44xU4.cTomransmission Control
Electronic Throttle Control
Super-Capacitor Charge/Discharge Monitoring in
Hybrid Cars
Precision High-Voltage Current Monitoring
Features
o -20V to +75V Input Common-Mode Voltage Range
o 400µV (max) Input Offset Voltage
o 0.6% (max) Gain Accuracy Error
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
o 0.5µA (typ) Shutdown Current
o Rail-to-Rail Output
o -40°C to +125°C Automotive Temperature Range
Ordering Information/
Selector Guide
PART
VSENSE
(mV)
GAIN
(V/V)
PIN-PACKAGE
MAX9918ASA+
50 Adjustable 8 SOIC-EP*
MAX9919FASA+
50
45 8 SOIC-EP*
MAX9919NASA+
50
90 8 SOIC-EP*
MAX9920ASA+
200 Adjustable 8 SOIC-EP*
Note: All devices operate over the -40°C to +125°C tempera-
ture range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
VBATT
VCC
VCC
φ1A
RSENSE
φ2B MAX9918
MAX9920
M
RS+
A OUT
R2
FB
ADC
INPUT STAGE
RS- LEVEL SHIFTER
REFIN
R1
REF
φ2B
φ1B
ADJUSTABLE GAIN
µC
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.
1 page  
-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
PARAMETER
REFIN Common-Mode Rejection
Ratio
REFIN Current
SHDN Logic-High
SHDN Logic-Low
SHDN Logic-Input Current
Supply Voltage Range
Power-Supply Rejection Ratio
(Note 3)
Supply Current
Shutdown Supply Current
Small-Signal -3dB Bandwidth
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Slew Rate
1% Settling Time from VSENSE
Step
SYMBOL
CONDITIONS
MAX9918, MAX9919_
REFINCMRR
MAX9920
0V ≤ VREFIN ≤ (VCC
- 1.9V)
0V ≤ VREFIN ≤ (VCC
- 2.4V)
IREFIN
VIH
VIL
VCC
PSRR
ICC
ICC_SHDN
BW
MAX9918, MAX9919_, VRS+ = VRS- = ±50mV
MAX9920, VRS+ = VRS- = ±200mV
0V ≤ VSHDN ≤ VCC
Inferred from PSRR test
MAX9918, MAX9919_ 4.5V ≤ VCC ≤ 5.5V
MAX9920
4.5V ≤ VCC ≤ 5.5V
VRS+ = VRS- = +14V
TA = +25°C
TA = -40°C to +125°C
VRS+ = VRS- = -2V
TA = +25°C
TA = -40°C to +125°C
VSHDN = VCC = 5V
MAX9918, VSENSE = 50mV
MAX9919F, VSENSE = 50mV
MAX9919N, VSENSE = 50mV
MAX9920, VSENSE = 200mV
MAX9918
MAX9919F
SR
MAX9919N
MAX9920
MAX9918
MAX9919F
MAX9919N
MAX9920
VSENSE = 5mV to 50mV step
VSENSE = 50mV to 5mV step
VSENSE = 5mV to 50mV step
VSENSE = 50mV to 5mV step
VSENSE = 5mV to 50mV step
VSENSE = 50mV to 5mV step
VSENSE = 20mV to 200mV step
VSENSE = 200mV to 20mV step
MIN
82
75
2.0
4.5
74
68
TYP
103
90
103
100
0.7
1.0
0.5
75
250
120
230
0.6
0.9
3.0
1.5
12
7
3.5
2.5
3.5
3
5
3
MAX UNITS
dB
±100
±100
0.8
5
5.5
1.2
1.5
1.6
2.2
10
µA
V
V
µA
V
dB
mA
µA
kHz
V/µs
µs
_______________________________________________________________________________________ 5
5 Page 
-20V to +75V Input Range, Precision
Uni-/Bidirectional, Current-Sense Amplifiers
Typical Operating Characteristics (continued)
(VCC = 5V, TA = +25°C, unless otherwise noted.)
SMALL-SIGNAL TRANSIENT
(GAIN = 45V/V)
MAX9918 toc31
SMALL-SIGNAL TRANSIENT
(GAIN = 90V/V)
MAX9918 toc32
5mV/div
5mV/div
50mV/div
MAX9918, VCM = 14V
VSENSE = 10mV TO 15mV
10Fs/div
LARGE-SIGNAL TRANSIENT
(GAIN = 45V/V)
MAX9918 toc33
50mV/div
100mV/div
MAX9918, VCM = 14V
VSENSE = 10mV TO 15mV
10Fs/div
LARGE-SIGNAL TRANSIENT
(GAIN = 90V/V)
MAX9918 toc34
50mV/div
www.DataSheet4U.com
500mV/div
MAX9918, VCM = 14V
VSENSE = 0V TO 50mV
10Fs/div
1V/div
MAX9918, VCM = 14V
VSENSE = 0 TO 50mV
10Fs/div
COMMON-MODE STEP RESPONSE
MAX9918 toc35
MAX9918, VCM = 14V
SSENSE = PS (50mV)
10V/div
1V/div
10Fs/div
OUTPUT RESPONSE TO
COMMON-MODE TRANSIENT
MAX9918 toc36
VCM
50V/div
0
OUTPUT AC-COUPLED
FULL SCALE
AT THE INPUT
VOUT
100mV/div
4µs/div
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MAX9920.PDF ] | |
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