MAX8725EVKIT Maxim Integrated, MAX8725EVKIT Datasheet

MAX8725EVKIT

Manufacturer Part Number

MAX8725EVKIT

Description

Battery Management Evaluation Kit for the MAX8725

Manufacturer

Maxim Integrated

Series

MAX1909, MAX8725r

Datasheet

1.MAX8725EVKIT.pdf (7 pages)

Specifications of MAX8725EVKIT

Battery Type

Li-Ion, Li-Polymer, NiCd, NiMH, Lead Acid, Universal

Operating Supply Voltage

8 V to 28 V

Charge Safety Timers

Operating Supply Current

2.7 mA

Product Type

Charge Management

Temperature Monitoring

Uvlo Start Threshold

9.18 V

Uvlo Stop Threshold

9.42 V

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The MAX8725 evaluation kit (EV kit) is an accurate and

efficient multichemistry battery charger. The EV kit can

charge three or four series Li+ cells with a current up to

3A. Charge current and input-source current are

adjustable using on-board potentiometers. The output

voltage is set to 4.2V

battery pack. The number of series cells is jumper selec-

table. The output voltage is adjustable between 4V to

4.4V (

tors. The EV kit provides outputs to monitor the AC-

adapter current and the presence of an AC adapter.

The MAX8725 automatically selects the power path for

supplying power to the system by controlling two external

p-channel MOSFETs. This decision is made based on the

presence of an AC adapter.

19-0292; Rev 0; 5/05

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

DESIGNATION QTY

C13, C14, C15

C10, C11, C21

C12, C17, C18

C7, C8, C9

C1, C2

C5, C6

the number of series cells) by installing two resis-

________________________________________________________________ Maxim Integrated Products

10µF ±20%, 25V X5R ceramic

capacitors (1812)

Taiyo Yuden TMK432BJ106KM,

TDK C4532X5R1E106M

Not installed (2220)

22µF ±20%, 25V ceramic capacitor

(2220)

TDK C5750X5R1E226M

Not installed, E-size capacitors

Not installed, capacitors (0603)

1µF ±10%, 6.3V X5R ceramic

capacitors (0603)

Murata GRM188R60J105K,

Taiyo Yuden JMK107BJ105KA,

TDK C1608X5R1A105K

0.1µF ±10%, 25V X7R ceramic

capacitors (0603)

Murata GRM188R71E104K,

TDK C1608X7R1E104K

General Description

the number of series cells in the

DESCRIPTION

MAX8725 Evaluation Kit

♦ Input Current Limiting

♦ ±0.5% Output Voltage Accuracy Using Internal

♦ Automatic Selection of System Power Source

♦ Analog Inputs Control Charge Current and

♦ Monitor Outputs for

♦ Up to 17.6V Battery Voltage

♦ +8V to +25V Input Voltage

♦ Up to 3A Battery-Charge Current

♦ Charges Li+, NiCd, and NiMH Battery Chemistries

♦ Surface-Mount Construction

♦ Fully Assembled and Tested

DESIGNATION QTY

MAX8725EVKIT

Reference

Charge Voltage

C19, C20

AC Adapter Current

AC Adapter Presence

C16

C22

PART

TEMP RANGE

0°C to +70°C

1µF ±10%, 25V X7R ceramic

capacitor (1206)

Murata GRM31MR71E105K,

Taiyo Yuden TMK316BJ105KL,

TDK C3216X7R1E105K

0.01µF ±10%, 50V X7R ceramic

capacitors (0603)

Murata GRM188R71H103K,

Taiyo Yuden UMK107B103KZ,

TDK C1608X7R1H103K

2.2µF ±20%, 35V tantalum capacitor

(B-size)

AVX TAJB225M035

Kemet T491B225M035AS

Schottky diode, 0.5A, 30V SOD-123

Diodes Inc. B0530W,

General Semiconductor MBR0530,

ON Semiconductor MBR0530

Not installed

Ordering Information

Component List

DESCRIPTION

IC PACKAGE

28 Thin QFN

Features

Related parts for MAX8725EVKIT

MAX8725EVKIT Summary of contents

Page 1

... Input Voltage ♦ Battery-Charge Current ♦ Charges Li+, NiCd, and NiMH Battery Chemistries ♦ Surface-Mount Construction ♦ Fully Assembled and Tested Ordering Information PART TEMP RANGE MAX8725EVKIT 0°C to +70°C Component List DESIGNATION QTY 1µF ±10%, 25V X7R ceramic capacitor (1206) C16 1 ...

Page 2

MAX8725 Evaluation Kit DESIGNATION QTY DESCRIPTION Smart battery header assembly, right J1 1 angle, keyless, five position Tyco Electronics (AMP) 787441-1 JU1, JU2 2 2-pin headers JU3 0 Not installed 10µH, 4.4A inductor Sumida CDRH104R-100NC TOKO 919AS-100M Single, ...

Page 3

Required Equipment Before beginning, the following equipment is required: • DC source to supply the input current to the charger; this source must be capable of supplying a voltage greater than the battery-voltage set point and have sufficient current rating ...

Page 4

MAX8725 Evaluation Kit V is the desired battery-regulation voltage and BATT CELLS is the number of cells selected by jumper JU1. Choose 1% resistors with a total resistance less than 250kΩ to minimize error caused by bias current. For V ...

Page 5

Figure 1. MAX8725 EV Kit Schematic _______________________________________________________________________________________ MAX8725 Evaluation Kit 5 ...

Page 6

MAX8725 Evaluation Kit Figure 2. MAX8725 EV Kit Component Placement Guide— Component Side Figure 4. MAX8725 EV Kit PC Board Layout—Signal and Ground Layer 2 6 _______________________________________________________________________________________ Figure 3. MAX8725 EV Kit PC Board Layout—Component Side Figure 5. MAX8725 EV ...

Page 7

... 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. 7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2005 Maxim Integrated Products MAX8725 Evaluation Kit Figure 7. MAX8725 EV Kit Component Placement Guide— ...

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