Maxim > Products > Amplifiers and Comparators > MAX9918, MAX9919, MAX9920
Maxim > Products > Automotive > MAX9918, MAX9919, MAX9920

MAX9918, MAX9919, MAX9920

-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

Current-Sense Amplifiers with Input Common Range that Extends Well Below Ground (-20V)

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

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 V_REFIN = GND and as bidirectional amplifiers when V_REFIN = V_CC/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.

Data Sheet

Download	Rev 4	(PDF, 2.7MB)
E-Mail

An evaluation kit is available: MAX9918EVKIT

Key Features

-20V to +75V Input Common-Mode Voltage Range
400µV (max) Input Offset Voltage
0.6% (max) Gain Accuracy Error
Uni- or Bidirectional Current Sensing
Reference Input for Bidirectional OUT
120kHz, -3dB Bandwidth (MAX9919N)
Single-Supply Operation (4.5V to 5.5V)
1mA Supply Current
0.5µA (typ) Shutdown Current
Rail-to-Rail Output
-40°C to +125°C Automotive Temperature Range

Applications/Uses

4x4 Transmission Control
Current Monitoring of Inductive Loads
Electronic Throttle Control
H-Bridge Motor Current Sensing
High- and Low-Side Precision Current Sensing
Precision High-Voltage Current Monitoring
Solenoid Current Sensing
Super-Capacitor Charge/Discharge Monitoring in Hybrid Cars

Key Specifications:

Current Sense Amplifiers

Part Number

CMVR
(V)

V_CC
(V)

I_CC
(µA)

Bi-Dir. Curr. Sense

V_{SENSE_FS}
(mV)

V_OS @25°C
(µV)

Gain

Gain Accuracy @25°C
(%)

BW
(kHz)

Comp-
arators

Oper. Temp.
(°C)

Package/Pins

Budgetary Price

min

max

min

max

typ

recomm.

max

@ -3dB

See Notes

MAX9918

-20

4.5

5.5

1000

Yes

400

Adj.

0.6

-40 to +125

SOIC(N)-EP/8

$0.94 @1k

MAX9919

400

45 V/V

90 V/V

0.45

120

250

SOIC(N)-EP/8

MAX9920

200

1200

Adj.

230

SOIC(N)-EP/8

See All Current Sense Amplifiers (36)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Typical Operating Circuit

Application Notes

Application Note 4050		Current Sensing on a Negative Voltage Supply Rail, using a Precision Instrumentation Amplifier
Tutorial 4685		How Continuous Positive Airway Pressure (CPAP) Respiratory Ventilation Systems Function
Tutorial 4692		Introduction to Ventilators and Ventilation Rate Measurements
Tutorial 4697		Overview of Industrial Motor Control Systems
Tutorial 4699		Overview of Sensor Signal Paths
Application Note 4837		Protect Current-Sense Amplifiers from Negative Overvoltage
Application Note 5073		Accurate High-Side Current-Sense Amplifier Monitors PWM Load Current

Product Guides

Amplifiers and Comparators (PDF)

Reliability Reports

Reliability Report:	MAX9918.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

MAX9918 PSPICE Macromodel

MAX9919F PSPICE Macromodel

MAX9919N PSPICE Macromodel

MAX9920 PSPICE Macromodel

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9918ASA+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9918ASA+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9918ASA/V+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9918ASA/V+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9919FASA+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9919FASA+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9919NASA+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9919NASA+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9920ASA+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9920ASA+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX9920ASA/V+			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX9920ASA/V+T			Active	SOIC(N)-EP;8 pin;30.9 mm² Outline Drawing:21-0111 (PDF) Land Pattern: 90-0151 (PDF) Use pkgcode/variation: S8E+14*	-40°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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Evaluation Kits

MAX9918EVKIT

Evaluation Kit for the MAX9918

Products with Similar Part Numbers

MAX9918EVKIT

Evaluation Kit for the MAX9918

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[ 2010-04-07 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-5015 Rev 4; 2011-08-09
This page last modified: 2011-08-09

-20V to +75V Input Range, Precision Uni-/Bidirectional, Current-Sense Amplifiers

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Application Notes

Product Guides

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

Similar Products by Application

Evaluation Kits

Products with Similar Part Numbers

More Information

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products