MAX9920 Maxim, MAX9920 Datasheet

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MAX9920

Manufacturer Part Number
MAX9920
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
Manufacturer
Maxim
Datasheet
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 V
and as bidirectional amplifiers when V
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.
19-5015; Rev 4; 7/11
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.
φ1A
φ2B
H-Bridge Motor Current Sensing
Solenoid Current Sensing
Current Monitoring of Inductive Loads
High- and Low-Side Precision Current Sensing
4x4 Transmission Control
Electronic Throttle Control
Super-Capacitor Charge/Discharge Monitoring in
Hybrid Cars
Precision High-Voltage Current Monitoring
Uni-/Bidirectional, Current-Sense Amplifiers
________________________________________________________________ Maxim Integrated Products
R
SENSE
V
BATT
General Description
-20V to +75V Input Range, Precision
M
Applications
REFIN
REFIN
φ2B
φ1B
RS+
RS-
= V
SHDN
= GND
LEVEL SHIFTER
CC
INPUT STAGE
MAX9918
MAX9920
/2.
GND
V
CC
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
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.
MAX9918ASA+
MAX9918ASA/V+
MAX9919FASA+
MAX9919NASA+
MAX9919NASA/V+
MAX9920ASA+
MAX9920ASA/V+
PART
ADJUSTABLE GAIN
A
Typical Operating Circuit
Ordering Information/
V
SENSE
(mV)
±200
±200
±50
±50
±50
±50
±50
FB
REFIN
OUT
R1
R2
Selector Guide
Adjustable
Adjustable
Adjustable
Adjustable
REF
GAIN
(V/V)
45
90
90
GND
Features
V
CC
PIN-
PACKAGE
8 SOIC-EP*
8 SOIC-EP*
8 SOIC-EP*
8 SOIC-EP*
8 SOIC-EP*
8 SOIC-EP*
8 SOIC-EP*
μC
ADC
1

Related parts for MAX9920

MAX9920 Summary of contents

Page 1

... The MAX9918/MAX9919/MAX9920 oper- ate as unidirectional amplifiers when V and as bidirectional amplifiers when V The MAX9920 attenuates the input signal by a factor the input level-shifting stage allowing the device to sense voltages up to 200mV (unidirectional operation) or ±100mV (bidirectional operation). ...

Page 2

... ELECTRICAL CHARACTERISTICS ( +14V RS+ RS- SENSE 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A ues are +25°C.) (Note 1) A PARAMETER SYMBOL Input Offset Voltage (Note 2) 2 _______________________________________________________________________________________ Output Short Circuit to V Continuous Current into Any Pin (Not to exceed package power dissipation) ................± ...

Page 3

... Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V +14V RS+ RS- SENSE 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A ues are +25°C.) (Note 1) A PARAMETERS SYMBOL Input Offset Voltage Drift (Note 3) Common-Mode Range Common-Mode Rejection Ratio CMRR ...

Page 4

... Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V +14V RS+ RS- SENSE 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A ues are +25°C.) (Note 1) A PARAMETER SYMBOL Gain Error (Note 2) FB Input Bias Current Output-Voltage High (Note 4) V ...

Page 5

... Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V +14V RS+ RS- SENSE 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A ues are +25°C.) (Note 1) A PARAMETERS SYMBOL REFIN Common-Mode Rejection RE FIN Ratio REFIN Current SHDN Logic-High ...

Page 6

... Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V +14V RS+ RS- SENSE 90V/V, R2/R1 = 89kΩ/1kΩ; for MAX9920, A ues are +25°C.) (Note 1) A PARAMETERS SYMBOL 1% Settling Time from V Step CM Power-Up Time Max Capacitive Load Stability ...

Page 7

Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ( +25°C, unless otherwise noted +14V) RS+ 0.50 0.45 0.40 0.35 0.30 0.25 0.20 0.15 0.10 0.05 0 -400 -320 -240-160 ...

Page 8

Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ( +25°C, unless otherwise noted GAIN ERROR (V = -2V, MAX9919N, A RS+ 0.6 0.5 0.4 0.3 0.2 0.1 0 -0.4 -0.3 -0.2 -0.1 GAIN ...

Page 9

Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ( +25°C, unless otherwise noted LINEARITY vs +14V 0.14 REFIN GND ...

Page 10

... IN+ - IN- = 50mV - SHDN - REFIN -50 - (V) CM GAIN vs. FREQUENCY -10 -20 -30 -40 MAX9920 V = 14V -50 CM GAIN = 20V/V -60 0.001 0.01 0 FREQUENCY (MHz) 10 ______________________________________________________________________________________ Typical Operating Characteristics (continued (DASH) SENSE T = +125NC 1 50mV (SOLID) SENSE 1 ...

Page 11

Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ( +25°C, unless otherwise noted SMALL-SIGNAL TRANSIENT (GAIN = 45V/V) 5mV/div MAX9918, V 50mV/div V = 10mV TO 15mV SENSE 10Fs/div LARGE-SIGNAL TRANSIENT (GAIN = ...

Page 12

Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers ( +25°C, unless otherwise noted SHUTDOWN ON/OFF DELAY 5V/div 1V/div OUTPUT OVERDRIVE RECOVERY (30V/V) 200mV/div 2V/div 12 ______________________________________________________________________________________ Typical Operating Characteristics (continued) MAX9918 toc37 5V/div ...

Page 13

... OUT Current-Sense Output. V Feedback Input. Connect resistive-divider network to set the gain for the MAX9918 and 6 FB MAX9920. See the Adjustable Gain (MAX9918/MAX9920) section for more information. Leave FB unconnected for the MAX9919 for proper operation. Reference Input. Set REFIN REFIN operation ...

Page 14

... MAX9919N SHDN GND Figure 2. Bidirectional Operation 14 ______________________________________________________________________________________ The MAX9918/MAX9919 operate in bidirectional mode by application of a low-source impedance reference voltage in the REFIN. For the MAX9920, the reference voltage range = V . The REFIN GND relative to V OUT ±V SENSE V OUT 3 ...

Page 15

... The MAX9918/MAX9920 feature externally adjustable gain set by a resistive-divider network circuit using resistors 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: ⎛ ⎞ R ...

Page 16

... INPUT STAGE/ LEVEL SHIFTER SHDN GND V CC MAX9918 MAX9920 INPUT INPUT STAGE/ LEVEL SHIFTER SHDN GND GAIN IS SET BY EXTERNAL RESISTORS, R1 AND [1+(R2/R1)] FOR MAX9918 G = [1+(R2/R1)]/4 FOR MAX9920 PROCESS: BiCMOS Functional Diagram OUT REFIN FIXED GAIN G = 45V/V OR 90V/V OUT ...

Page 17

... Uni-/Bidirectional, Current-Sense Amplifiers For the latest package outline information and land patterns (footprints www.maxim-ic.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 per- tains to the package regardless of RoHS status ...

Page 18

... Added automotive qualified parts for the MAX9919NASA/V+ and the MAX9920ASA/V+ Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. ...

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