MAX9937AXK+T [MAXIM]
Current-Sense Amplifier with Reverse-Battery Protection;
| 型号： | MAX9937AXK+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Current-Sense Amplifier with Reverse-Battery Protection 电池 |
| 文件： | 总6页 (文件大小：280K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Evaluates: MAX9937
MAX9937 Evaluation Kit
General Description
Procedure
The MAX9937 evaluation kit (EV kit) is an assembled and
tested PCB used to evaluate the MAX9937 current-sense
amplifier, designed for unidirectional high-side current-
sense applications. The EV kit can be used to dem-
onstrate the applicability of the MAX9937 to withstand
transients, such as load-dump protection, reverse-battery
protection, and filtering for EMI.
The MAX9937 EV kit is fully assembled and tested. Follow
the steps below to verify board operation. Caution: Do
not turn on power supplies until all connections are
completed.
1) Set the input power supply to 12V and connect the
positive terminal to the VBAT PCB pad. Connect the
ground of the power supply to the GND PCB pad.
2) Set the VCC power supply to 5V and connect the
positive terminal to the VCC PCB pad. Connect the
ground of the VCC supply to the GND pad.
Features
● Reverse-Battery and Load-Dump Protection
• -20V to +40V
3) Set the electronic load to sink 2A.
● +4V to +28V Input Common-Mode Range
● +2.7V to +5.5V Supply Range
● Flexible EMI Filtering
4) Connect the electronic load’s positive terminal to the
LOAD pad. Connect the load’s ground to the GND
PCB pad.
● Lead(Pb)-Free and RoHS Compliant
● Fully Assembled and Tested
5) Connect the DVM across the VOUT PCB pad and the
GND pad.
6) Turn on the 5V power supply.
7) Turn on the 12V power supply.
Quick Start
Recommended Equipment
8) Adjust the electronic load current (I
) between 0A
LOAD
Before beginning, the following equipment is needed:
● 12V, 2A power supply (VBAT)
and 2A and verify that V
according to the following equation:
is proportional to V
OUT SENSE
R2
● 5V power supply (VCC)
V
=V
×
SENSE
OUT
R3
● Electronic load capable of sinking 2A
● Digital voltmeter (DVM)
where V
= I
x R1.
SENSE
LOAD
Ordering Information
PART
TYPE
MAX9937EVKIT+
EV Kit
*Denotes lead(Pb)-free and RoHS compliant.
19-4406; Rev 1; 5/15
Evaluates: MAX9937
MAX9937 Evaluation Kit
Detailed Description of Hardware
Component List
The MAX9937 EV kit evaluates the MAX9937
unidirectional high-side current-sense amplifier, which
features a 4V to 28V input common-mode voltage range
that is independent of supply voltage (VCC = 2.7V to
5.5V). The MAX9937 monitors the current through a
current-sense resistor by converting the sense voltage to a
DESIGNATION QTY
DESCRIPTION
1µF ±10%, 50V X7R ceramic
capacitor (1206)
Murata GRM31MR71H105KA
TDK C3216X7R1H105K
C1
C2, C4
C3
1
0
1
voltage output (V ). Gain is set by the ratio of an output
OUT
Not installed, capacitors (0603)
resistor (R2) and an input resistor (R3). High-side current
monitoring with the MAX9937 does not interfere with the
ground path of the load, making it useful for a variety of
battery/ECU-monitoring applications.
0.01µF ±10%, 50V X7R ceramic
capacitor (0603)
Murata GRM188R71H103K
TDK C1608X7R1H103K
The MAX9937 EV kit produces an output voltage (V
given by the following equations:
)
OUT
0.05Ω ±1%, 0.5W current-sense
resistor (1206)
R1
1
V
= I
× R
LOAD SENSE
IRC LRC-LR1206LF-01-R050-F
SENSE
R2
R2
1
2
20kΩ ±1% resistor (0603)
1kΩ ±1% resistor (1206)
V
= V
×
SENSE
OUT
R3
R3, R4
where I
is the current load applied to the device and
Current-sense amplifier (5 SC70)
Maxim MAX9937AXK+
LOAD
U1
—
1
1
R
is the current-sense resistor R1 (e.g., I
SENSE
LOAD
= 2A, R
= 0.05Ω, R2 = 20kΩ, R3 = 1kΩ, and
SENSE
PCB: MAX9937 EVALUATION KIT+
V
OUT
= 2V).
Overvoltage Protection
Component Suppliers
The MAX9937 EV kit provides a 1kΩ resistor at each of the
RSP and RSN inputs to demonstrate the reverse-battery
and load-dump protection capabilities of the MAX9937
SUPPLIER
IRC, Inc.
Murata Americas 770-436-1300 www.murataamericas.com
TDK Corp. 847-803-6100 www.component.tdk.com
PHONE
WEBSITE
361-992-7900 www.irctt.com
IC. The normal operating V
and V
range is 4V to
RSP
RSN
28V, but the robust input ESD structure allows the input
common-mode voltages to exceed this range for short
periods of time.
Note: Indicate that you are using the MAX9937 when contacting
these component suppliers.
Short-duration overvoltages on the battery line (VBAT to
LOAD) are isolated from the RSP and RSN pins of the
MAX9937 by the use of input resistors R3 and R4. The
input ESD clamp structure is designed so the device can
withstand short-duration (< 1s) overvoltages up to 40V
when using resistors R3 and R4 of 500Ω or greater. The
circuit can also withstand a reverse-battery voltage of -20V.
During reverse-battery conditions, size R3 and R4 input
resistors to withstand their expected power dissipations.
Refer to the Input Common-Mode Voltages > 28V and < 0V
section in the MAX9937 IC data sheet for a more detailed
description.
EMI Filtering
The MAX9937 EV kit provides two uninstalled capacitor
pads (C2 and C4), which the user can populate to improve
performance in the presence of input commonmode volt-
age and input differential-voltage transients. Refer to the
Flexible EMI Filtering section in the MAX9937 IC data
sheet for a more detailed description.
Maxim Integrated
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Evaluates: MAX9937
MAX9937 Evaluation Kit
Figure 1. MAX9937 EV Kit Schematic
Maxim Integrated
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Evaluates: MAX9937
MAX9937 Evaluation Kit
1.0’’
1.0’’
Figure 2. MAX9937 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX9937 EV Kit Component PCB Layout—
Component Side
Maxim Integrated
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Evaluates: MAX9937
MAX9937 Evaluation Kit
1.0’’
Figure 4. MAX9937 EV Kit PCB Layout—Solder Side
Maxim Integrated
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Evaluates: MAX9937
MAX9937 Evaluation Kit
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
1/09
Initial release
—
Deleted automotive references in General Description, Component List, and
Detailed Description of Hardware sections; added Revision History table
1
5/15
1, 2, 6
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2015 Maxim Integrated Products, Inc.
│ 6
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