MAX9919NASA+T Maxim Integrated, MAX9919NASA+T Datasheet

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MAX9919NASA+T

Manufacturer Part Number
MAX9919NASA+T
Description
Current Sense Amplifiers Neg 20V-75V Uni-/Bi Directional CSAmp
Manufacturer
Maxim Integrated
Series
MAX9918, MAX9919, MAX9920r
Datasheet

Specifications of MAX9919NASA+T

Rohs
yes
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.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.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
R
SENSE
V
BATT
General Description
M
-20V to +75V Input Range, Precision
Applications
REFIN
REFIN
φ2B
φ1B
RS+
RS-
= V
SHDN
MAX9918/MAX9919/MAX9920
= 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+
MAX9919FASA/V+
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
±50
FB
REFIN
OUT
EVALUATION KIT AVAILABLE
R1
R2
Selector Guide
Adjustable
Adjustable
Adjustable
Adjustable
REF
GAIN
(V/V)
45
45
90
90
19-5015; Rev 5; 1/13
GND
Features
V
CC
PIN-
PACKAGE
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
8 SO-EP*
μC
ADC

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MAX9919NASA+T Summary of contents

Page 1

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 ...

Page 2

... T = +25°C ±0. -40° +125° +25°C ±0. -40° +125° +25°C ±0. -40° +125° MAX UNITS ±0.4 ±0.7 ±0.4 ±1.3 ±0.4 ±0.9 mV ±0.4 ±1.0 ±1.2 ±3.0 ±0.9 ±3.5 Maxim Integrated ...

Page 3

... Common-Mode Rejection Ratio (Note 3) Input Bias Current Input Offset Current Input Leakage Current in Shutdown Input Leakage Current Input Resistance Full-Scale Sense Voltage (Note 4) Gain (Notes 2, 4) Minimum Adjustable Gain Maxim Integrated MAX9918/MAX9919/MAX9920 = ( 0V RS+ RS- SHDN = 20V/V, R2/R1 = 79kΩ/1kΩ SYMBOL ...

Page 4

... 10kΩ 0 9918, M AX9919_ MAX9920 MAX UNITS ±0.6 ±1.2 ±0.6 ±1.0 ±0.45 ±1.2 ±0.45 ±0.9 % ±0.6 ±1.2 ±0.6 ±1.0 ±1.0 ±1.7 ±1.0 ±1 Ω 1 2.4 Maxim Integrated ...

Page 5

... 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 Slew Rate 1% Settling Time from V SENSE Step Maxim Integrated MAX9918/MAX9919/MAX9920 = ( 0V RS+ RS- SHDN = 20V/V, R2/R1 = 79kΩ/1kΩ SYMBOL ...

Page 6

... SENSE drift, CMRR, and PSRR 50mV for the SENSE = V MAX UNITS μs μs pF √ Hz nV/ Maxim Integrated ...

Page 7

... OFFSET VOLTAGE (FV/ ° C) GAIN ERROR (V = +14V, MAX9919F +45V/V) RS+ V 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 GAIN ERROR (%) Maxim Integrated MAX9918/MAX9919/MAX9920 Typical Operating Characteristics V DRIFT +14V) RS+ 0.30 0.25 0.20 0.15 0.10 0.05 0 400 - OFFSET VOLTAGE (FV 500 400 T = -40°C A 300 T = +25° ...

Page 8

... A BIDIRECTIONAL 0.05 0 -0. +125° +25°C A -0.10 -0.15 -0.20 -0.25 -30 -20 - (mV) SENSE LINEARITY vs. V SENSE 0. - 0.06 REFIN GND A = 90V -40° +25°C A 0.04 A UNIDIRECTIONAL 0.02 0 -0. +125°C A -0.04 -0.06 -0.08 -0. (mV) SENSE Maxim Integrated ...

Page 9

... OUT 3.0 - SOLID LINE CM 2.5 14V V : DASHED LINE CM 2.0 1.5 1.0 0.5 0 -0.5 -1.0 -1.5 -2.0 -2.5 -3.0 -40 -30 -20 -10 Maxim Integrated MAX9918/MAX9919/MAX9920 Typical Operating Characteristics (continued) SENSE T = -40° (mV) SENSE SENSE V = +14V REFIN 30V/V = +125° BIDIRECTIONAL = +25° ...

Page 10

... MAX9918 V = 14V -30 CM GAIN = 90V/V - 0.001 0.01 FREQUENCY (MHz) PSRR vs. FREQUENCY 0 MAX9918 V = 14V CM - 50mV SENSE -40 -60 -80 -100 -120 -140 10 100 0.0001 0.001 0.01 FREQUENCY (kHz) vs. V BIAS ( 100 1k 10k Maxim Integrated ...

Page 11

... MAX9918, V 50mV/div V SENSE LARGE-SIGNAL TRANSIENT (GAIN = 45V/V) 50mV/div MAX9918, V 500mV/div 50mV SENSE COMMON-MODE STEP RESPONSE 10V/div 1V/div Maxim Integrated MAX9918/MAX9919/MAX9920 Typical Operating Characteristics (continued) MAX9918 toc31 = 14V CM = 10mV TO 15mV 10Fs/div MAX9918 toc33 = 14V CM 10Fs/div MAX9918 toc35 MAX9918 14V CM S ...

Page 12

... MAX9918 14V (50mV) SENSE 4Fs/div MAX9918 toc39 MAX9918 14V SENSE 50mV/div 4Fs/div POWER-UP TIME MAX9918 toc38 MAX9918 14V (50mV) SENSE 4Fs/div OUTPUT OVERDRIVE RECOVERY (90V/V) MAX9918 toc40 2V/div MAX9918 14V SENSE 4Fs/div Maxim Integrated ...

Page 13

... SENSE The 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. Maxim Integrated MAX9918/MAX9919/MAX9920 TOP VIEW + RS ...

Page 14

... 2.4V (typically V /2). The output voltage CC CC relative then proportional to the REFIN voltage drop from RS+ to RS- (Figure 2 90V/V DISCHARGE CURRENT 10mV 20mV 30mV 40mV OUT REFIN G = 90V/V 1.8V DISCHARGE CURRENT 0.9V 10mV 0 20mV -0.9V -1.8V /2 SENSE V SENSE Maxim Integrated ...

Page 15

... REFIN CC voltage range of ±V / OUT from either rail to achieve the rated gain accuracy. Maxim Integrated MAX9918/MAX9919/MAX9920 Shutdown Mode Choose R Accuracy: A high measured more accurately. This is because off- sets become less significant when the sense voltage is larger. In the linear region (100mV < V ...

Page 16

... MAX9920 RS+ INPUT INPUT STAGE/ LEVEL SHIFTER RS- 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 REFIN ADJUSTABLE GAIN Chip Information Maxim Integrated ...

Page 17

... For the latest package outline information and land patterns (footprints 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 8 SO-EP Maxim Integrated MAX9918/MAX9919/MAX9920 PACKAGE CODE OUTLINE NO. S8E+14 Package Information LAND PATTERN NO ...

Page 18

... 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 ...

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