MAX9928EVKIT [MAXIM]

Fully Assembled and Tested;


型号：	MAX9928EVKIT
厂家：	MAXIM INTEGRATED PRODUCTS
描述：	Fully Assembled and Tested
文件：	总4页 (文件大小：108K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

19-4397; Rev 0; 12/08

MAX9928 Evaluation Kit

Evluates:89/MAX4372

General Description

Features

The MAX9928 evaluation kit (EV kit) provides a proven

design to evaluate the MAX9928 uni-/bidirectional, high-

side, current-sense amplifier, which offers precision accu-

o Precision Real-Time Current Monitoring

o -0.1V to +28V Input Common-Mode Range

o Evaluates MAX9928, MAX9929, and MAX4372

racy specifications of V

< 400µV and gain error

< 1.0%. This EV kit demonstrates the MAX9928 in an ultra-

small, 1mm x 1.5mm x 0.6mm, 6-bump UCSP™ package.

o V

< 0.4mV; Gain Error < 1%

The MAX9928 is also available in an 8-pin µMAX , but

o SIGN Bit to Show Charge/Discharge Current Flow

o Lead(Pb)-Free and RoHS Compliant

o Proven PCB Layout

that package is not compatible with this EV kit.

The MAX9928 EV kit PCB comes with a MAX9928FABT+

installed, which is the 5µA/mV gain version. The

MAX9928 EV kit can also be used to evaluate the

MAX9928T, MAX9929F, and MAX9929T (2µA/mV, 50V/V,

and 20V/V, respectively). This EV kit can also evaluate

the MAX4372 in a footprint-compatible UCSP package.

Contact the factory for free samples of the pin-compatible

MAX9928TABT+, MAX9929FABT+, or MAX9929TABT+

devices.

o Fully Assembled and Tested

Ordering Information

PART

TYPE

MAX9928EVKIT+

EV Kit

+Denotes lead(Pb)-free and RoHS compliant.

Component List

DESIGNATION QTY

DESCRIPTION

DESIGNATION QTY

DESCRIPTION

0.1ꢀ 1%, 1/2W sensing resistor

(1206)

Vishay/Dale WSL1206R1000FEB18

CIN, COUT

Not installed, capacitors (0603)

RSENSE

0.1μF 10%, 50V X7R ceramic

capacitor (0603)

Not installed, resistors—short

Murata GRM188R71H104K

RIN1, RIN2

ROUT

1μF 10%, 50V X5S ceramic

capacitor (0603)

Taiyo Yuden UMK107C5105KA

10kꢀ 1% resistor (0603)

Precision current-sense amplifier

(6 UCSP)

Maxim MAX9928FABT+

—

PCB: MAX9928 Evaluation Kit+

Component Suppliers

SUPPLIER

PHONE

WEBSITE

Murata Electronics North America, Inc.

770-436-1300

800-348-2496

402-563-6866

www.murata-northamerica.com

www.t-yuden.com

Taiyo Yuden

Vishay

www.vishay.com

Note: Indicate that you are using the MAX9928 when contacting these component suppliers.

UCSP is a trademark and µMAX is a registered trademark of Maxim Integrated Products, Inc.

________________________________________________________________ Maxim Integrated Products

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.

MAX9928 Evaluation Kit

Quick Start

Recommended Equipment

Before beginning, the following equipment is needed:

Detailed Description of Hardware

The MAX9928 evaluation kit (EV kit) provides a proven

design to evaluate the MAX9928 uni-/bidirectional,

high-side, current-sense amplifier, which offers preci-

• MAX9928 EV kit

sion accuracy specifications of V

error < 1.0%.

< 400µV and gain

• 5V/10mA DC power supply

• 12V/1A DC power supply

Output Voltage Calculation

The MAX9928 EV kit is installed with a MAX9928FABT+,

which has a gain of 5µA/mV. The current-sense resistor

• An electronic load capable of sinking 800mA (e.g.,

HP 6060B)

) value is 0.1Ω with 1% tolerance. The V

SENSE

OUT

• Two digital voltmeters

given by:

Procedure

The MAX9928 EV kit is fully assembled and tested.

Follow the steps below to verify board operation.

Caution: Do not turn on the power supply or the

electronic load until all connections are completed.

= I

x R

x G x R

SENSE m OUT

OUT

LOAD

where G is the gain and I

is the current load

to change the effec-

LOAD

OUT

applied to the device. Vary R

tive voltage gain.

1) Connect the positive terminal of the 5V supply to

the VCC pad. Connect the negative terminal of the

5V supply to the GND pad.

Applying V

and V

Supply Voltages

RS+

The normal operating range for V

is 2.5V to 5.5V for

MAX9928/MAX9929. The normal operating range for

is 2.7V to 28V for MAX4372.

2) Connect the positive terminal of the 12V supply to

the RS+ pad. Connect the negative terminal of the

12V supply to the GND pad.

The normal input common-mode range at VRS+ and

VRS- is -0.1V to +28V for MAX9928/MAX9929. The

MAX4372 operates with an input range of 0V to 28V,

but the total OUT error at 0V can be up to 28%.

3) Set the electronic load to sink 500mA.

4) Connect the electronic load’s positive terminal to

the RS- pad and the negative terminal to the GND

pad.

Measuring the Load Current

The load current is measured as a voltage drop

) across an external sense resistor. This volt-

SENSE

5) Connect the first voltmeter across the OUT and the

GND pads.

age is then amplified by the current-sense amplifier

and presented as a current at its output pin and con-

6) Connect the second voltmeter across the SIGN and

the GND pads.

verted to a voltage by R

fiers, the output voltage has two components of error:

an offset error and a gain error. The offset error affects

accuracy at small V

accuracy at large V

and gain errors, accuracy can be optimized over a

wide dynamic range.

. Like all differential ampli-

OUT

7) Turn on the power supplies.

8) Turn on the electronic load.

and a gain error affects

SENSE

. By minimizing both offset

SENSE

9) Verify that the OUT voltmeter reading is approximate-

ly 2.5V and the SIGN voltmeter is approximately 5V.

Take care not to load the internal 1MΩ pullup resistor

on the SIGN pin when measuring this voltage.

Evluates:89/MAX4372

_______________________________________________________________________________________

MAX9928 Evaluation Kit

Evluates:89/MAX4372

Evaluating SIGN Output for

MAX9928/MAX9929

The MAX9928 and MAX9929 have a digital SIGN out-

put to indicate the direction of the load current flow

(charge vs. discharge current for a battery).

Evaluating MAX9929 or MAX4372

The MAX9929 and MAX4372 are voltage output

devices with an internal 10kΩ R

resistor. When

OUT

evaluating these devices, leave the MAX9928 EV kit

open.

OUT

Refer to the MAX9928/MAX9929 IC data sheet and/or

the MAX4372 IC data sheet for more information.

To evaluate current flowing in the opposite direction,

swap the position of the 12V supply and the electronic

load (connect the 12V supply to RS- and connect the

electronic load to RS+). Verify that the OUT voltmeter

still reads approximately 2.5V and the SIGN voltmeter

has changed to 0V.

Figure 1. MAX9929F EV Kit Schematic

_______________________________________________________________________________________

MAX9928 Evaluation Kit

Figure 2. MAX9928 EV Kit Component Placement Guide—

Component Side

Figure 3. MAX9928 EV Kit PCB Layout—Component Side

Evluates:89/MAX4372

Figure 4. MAX9928 EV Kit PCB Layout—Solder Side

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.

4 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

is a registered trademark of Maxim Integrated Products, Inc.

MAX9928EVKIT [MAXIM]

相关型号：

MAX9928EVKIT+

MAX9928F

MAX9928FABT T

MAX9928FABT+T

MAX9928FABTT

MAX9928FAUA

MAX9928FAUA+

MAX9928FAUA+T

MAX9928F_12

MAX9928_11

MAX9928_V01

MAX9929