MAX1908EVKIT [MAXIM]
Evaluation Kit for the MAX1908 ; 评估板MAX1908\n
| 型号： | MAX1908EVKIT |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Evaluation Kit for the MAX1908
|
| 文件： | 总7页 (文件大小：292K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2880; Rev 0; 6/03
MAX1908 Evaluation Kit
General Description
Features
The MAX1908 evaluation kit (EV kit) is an accurate and
efficient multichemistry battery charger. It uses analog
inputs to control charge voltage and current. The EV kit
can charge 2 to 4 series lithium-ion (Li+) cells with a
current up to 3A. High efficiency is achieved by a buck
topology with synchronous rectification. The EV kit pro-
vides outputs that can be used to monitor the input cur-
rent, the battery-charging current, and the presence of
an AC adapter.
ꢀ Input Current Limiting
ꢀ ±±0.5 ꢀBtterꢁy-VotBge ꢂetyꢃVint ꢄAAurBAꢁ ꢅUing
InternBo ReferenAe
ꢀ ꢄnBoVg InputU CVntrVo ChBrge Current Bnd
ꢀBtterꢁy-VotBge ꢂet ꢃVint
ꢀ MVnitVr OutputU fVr
Current DrBwn frVm ꢄC Input ꢂVurAe
ChBrging Current
ꢄC ꢄdBpter ꢃreUenAe
ꢀ ꢅp tV 1706- ꢀBtterꢁy-VotBge ꢂet ꢃVint
ꢀ +8- tV +2.- Input -VotBge
Ordering Information
ꢀ 3ꢄ ꢀBtterꢁ ChBrge Current
ꢃꢄRT
TEMꢃ RꢄNGE
IC ꢃꢄCKꢄGE
ꢀ ChBrgeU ꢄnꢁ ꢀBtterꢁ ChemiUtrꢁ: Li+, NiCd, NiMH,
MAX1908EVKIT
0°C to +70°C
28 QFN
LeBd ꢄAid, etA0
ꢀ ꢂurfBAeyMVunt CVnUtruAtiVn
ꢀ Fuooꢁ ꢄUUemboed Bnd TeUted
Component List
DEꢂIGNꢄTION QTY
DEꢂCRIꢃTION
DEꢂIGNꢄTION QTY
DEꢂCRIꢃTION
1µF 10%, 25V X7R ceramic
capacitor (1206)
Murata GRM31MR71E105K
Taiyo Yuden TMK316BJ105KL
TDK C3216X7R1E105K
22µF 20%, 25V X5R ceramic
capacitors (2220)
TDK C5750X5R1E226M
C1, C4
2
C16
1
C2, C3
C5, C6
0
0
Not installed (2220)
Not installed, E size
0.01µF 10%, 50V X7R ceramic
capacitors (0603)
Murata GRM188R71H103K
Taiyo Yuden UMK107B103KZ
TDK C1608X7R1H103K
0.1µF 10%, 25V X7R ceramic
capacitors (0603)
Murata GRM188R71E104K
TDK C1608X7R1E104K
C7, C9, C12,
C18, C19, C20
C21, C22
D1
2
1
2
6
C8, C13, C14,
C15, C17
Schottky diode, 10A, D-Pak
Diodes Inc. MBRD1035CTL
ON Semiconductor MBRD1035CTL
0
1
Not installed (0603)
4.7µF 10%, 6.3V X5R ceramic
capacitor (0603)
TDK C1608X5R0J475K
C10
Schottky diodes, 0.5A, 30V
SOD-123
Diodes Inc. B0530W
General Semiconductor MBR0530
ON Semiconductor MBR0530
D2, D3
1µF 10%, 6.3V X5R ceramic
capacitors (0603)
Murata GRM188R60J105K
Taiyo Yuden JMK107BJ105KA
TDK C1608X5R1A105K
C11, C23
2
Schottky diode, 1A, 40V, SMA
Central Semiconductor
CMSH1-40ML
D4
1
Diodes Inc. B130L
________________________________________________________________ Maxim Integrated Products
1
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.
MAX1908 Evaluation Kit
• DC source capable of supplying a voltage between
Component List (continued)
+2.5V to +3.6V for REFIN.
DESIGNATION QTY
DESCRIPTION
• Voltmeter.
Smart battery header assembly,
right angle, keyless, 5-position
Tyco Electronics 787441-1
• Battery pack or load.
J1
1
Procedure
The MAX1908 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. DV nVt turn Vn the pVwer Uuppoꢁ
untio Boo AVnneAtiVnU Bre AVmpoeted0 ObUerve Boo prey
AButiVnU Vn the bBtterꢁ mBnufBAturer’U dBtB Uheet:
JU1
1
4
0
2-pin header
3-pin headers
Not installed
JU2, JU3, JU5,
JU6
JU4
1) Install a shunt on JU1 to set the battery-voltage set
point to 4.2V per cell. If a different battery-voltage
set point is required, see the Battery-Voltage Set
Point section.
10µH, 4.4A inductor
Sumida CDRH104R-100NC
TOKO 919AS-100M
L1
1
Dual, N-channel, 8-pin SO, MOSFET
Fairchild FDS6912A
N1
P1
1
0
2) Place a shunt across pins 1-2 on JU2 to enable 3A
charging-current limit. If the battery is not rated for
3A charge current, then select a charge current and
set as explained in the Charging-Current Limit
(Potentiometer R12) section.
Not installed
0.01Ω 1%, 0.5W sense resistor
(2010)
Vishay Dale WSL2010 0.010 1.0%
IRC LRC-LR2010-01-R010-F
R1
R2
1
3) Set jumper JU5 to indicate the number of cells in
the battery pack (Table 1).
0.015Ω 1%, 0.5W sense resistor
(2010)
Vishay Dale WSL2010 0.015 1.0%
IRC LRC-LR2010-01-R015-F
4) Place a shunt across pins 2-3 on JU6.
1
0
5) Place a shunt across pins 2-3 on JU3 to disable the
MAX1908.
6) Connect the input-current supply across the
ADAPTER_IN and PGND pads.
R3–R6, R14,
R15, R17–R20,
R22, R23, R24
Not installed (0603)
7) Connect the +2.5VDC to +3.6VDC power supply to
REFIN and GND.
R7
R8
1
1
1
2
2
1
1
1
1
590kΩ 1% resistor (0603)
196kΩ 1% resistor (0603)
4.7kΩ 5% resistor (0603)
10kΩ 5% resistors (0603)
50kΩ potentiometers (multiturn)
33Ω 5% resistor (0603)
8) Connect a battery pack between the BATT+ and
BATT- pads.
R9
9) Turn on the power supplies.
R10, R11
R12, R13
R16
10) Enable the MAX1908 by moving the shunt on JU3 to
the 1-2 position.
11) Verify current is being delivered to the battery.
R21
1MΩ 5% resistor (0603)
10Ω 5% resistor (0603)
MAX1908ETI (28-pin QFN-EP)
R25
Detailed Description
U1
The MAX1908 includes all the functions necessary to
charge Li+ batteries. The EV kit is shipped with a charg-
ing-current limit of 3A and a battery-voltage set point of
4.2V times the number of cells in the battery pack.
Quick Start
Required Equipment
Before beginning, the following equipment is required:
The MAX1908 safely conditions overdischarged cells
by charging the battery pack at 300mA (1/10 of the
charging-current limit) until the battery-pack voltage
exceeds 3.1V times the number of cells. Once condi-
tioning is complete, the MAX1908 charges the battery
pack at a constant current of 3A (the charging-current
limit) until the battery pack voltage reaches 4.2V times
the number of cells (the battery-voltage set point). At
• DC source to supply the input current to the charg-
er. This source must be capable of supplying a volt-
age greater than the battery-voltage set point and
have a sufficient current rating.
2
_______________________________________________________________________________________
MAX1908 Evaluation Kit
this time, the MAX1908 charges the battery pack with a
constant voltage equal to the battery-voltage set point.
Battery-Voltage Set Point
The default battery-voltage set point on the MAX1908
EV kit is 4.2V times the number of cells. To set it to a
value between 4.0V and 4.4V (times the number of
cells), remove the shunt on JU1 and install resistors at
R5 and R6. Use the following equation to calculate the
resistor values:
Note: During charging, if the source-current limit is
reached, the charge current decreases.
For more information on the operation of the MAX1908,
refer to the Detailed Description section of the
MAX1908 data sheet.
Jumper JU1
Jumper JU1 connects VCTL to LDO. This sets the bat-
tery-voltage set point to 4.2V x the number of cells.
0.4
R5 = R6
−1
V
BATT
CELLS
− 4
The battery-voltage set point can be set between 4.0V
and 4.4V (times the number of cells) by removing the
shunt on JU1 and installing resistors at R5 and R6. See
the Battery-Voltage Set Point section for more information.
V
is the desired battery-voltage set point and
CELLS is the number of cells selected by jumper JU5.
BATT
Choose 1% resistors with a total resistance less than
Jumper JU2
Jumper JU2 connects ICTL to either LDO or poten-
tiometer R12. Connecting ICTL to LDO sets the charg-
ing-current limit to 3A. Connecting ICTL to potentiome-
ter R12 provides adjustment of the charging-current
limit to between 0.156A and 5A. Refer to the Setting the
Charging-Current Limit section of the MAX1908 data
sheet for more information.
250kΩ to minimize error caused by bias current.
For V
/ CELLS = 4, use 100kΩ for R6 and leave R5
BATT
uninstalled.
Charging-Current Limit
(Potentiometer R12)
The default charging-current limit on the MAX1908 EV
kit is 3A. To set it to a value between 0.156A and 5A,
move the shunt on jumper JU2 to the 2-3 position and
adjust potentiometer R12. Refer to the Setting the
Charging-Current Limit section of the MAX1908 data
sheet for more information.
Note: Applying a voltage less than REFIN/32 to ICTL
places the MAX1908 in shutdown mode; 5A charging
current requires a different inductor. The 8-pin SO dual
MOSFET (N1) is capable of handling 5A at room tem-
perature only. For a higher ambient temperature,
replace it with two single 8-pin SO MOSFETs.
Note: Five-amp charging current requires a different
inductor. The 8-pin SO dual MOSFET (N1) is capable of
handling 5A at room temperature only. For a higher
ambient temperature, replace it with two single 8-pin
SO MOSFETs.
Jumper JU3
Jumper JU3 either enables the MAX1908 or places it
into shutdown. See Table 1 for jumper settings.
Jumper JU4
Source-Current Limit (Potentiometer R13)
Potentiometer R13 is connected to CLS, the source-
current-limit input. Adjusting R13 allows the input-cur-
rent limit to be set between 3.75A and 7.5A. Refer to
the Setting the Input-Current Limit section of the
MAX1908 data sheet for more information.
Jumper JU4 is factory reserved.
Jumper JU5
Jumper JU5 selects the number of series cells to be
charged. See Table 1 for jumper settings.
Jumper JU6
Jumper JU6 connects ACOK to either a 1MΩ pullup
resistor or to an optional MOSFET circuit (P1, R22, and
R23). Using a MOSFET provides a lower dropout volt-
age than Schottky diode D1.
Evaluating the MAX1908 Above 25V
To evaluate the MAX1908 with an input voltage greater
than 25V (up to 28V), capacitors C1, C7, C9, and C16
must be replaced with higher voltage rating parts. Any
capacitors that were installed in locations C2, C5, and
C6 must also meet the higher voltage rating.
Use a P-channel MOSFET such as Fairchild FDS6675
for P1. Choose resistor values for R22 and R23 that
ensure V is not exceeded on the MOSFET.
GS
_______________________________________________________________________________________
3
MAX1908 Evaluation Kit
Table 1. Jumper Selection
JUMPER
JUMPER
FUNCTION
POSITION
Battery-voltage set point can be set between 4.0V and 4.4V times the number of cells.
Resistors R5 and R6 must be installed.
Open
JU1
JU2
JU3
JU4
JU5
Closed*
1-2*
VCTL = LDO. Battery-voltage set point set to 4.2V times the number of cells.
ICTL = LDO. Charging-current limit set to 3A.
ICTL connected to potentiometer R12. Charging-current limit can be adjusted between 0.156A
(V
ICTL
= REFIN/32) and 5A (V
= REFIN).
2-3
ICTL
Note: V
< REFIN/32 places the MAX1908 in shutdown.
ICTL
1-2*
2-3
SHDN = high. MAX1908 enabled.
SHDN = low. MAX1908 disabled.
Drive pad SHDN with an external signal.
Factory reserved.
Open
Open
Closed* (shorted
by PC board
trace)
Normal operation.
1-2
2-3*
Open
1-2
CELL = REFIN, cell count = 4.
CELL = GND, cell count = 2.
CELL = float, cell count = 3.
ACOK connected to optional MOSFET circuit (P1, R22, and R23).
ACOK connected to 1MΩ pullup resistor.
JU6
2-3*
*Default position.
Component Suppliers
SUPPLIER
PHONE
FAX
WEBSITE
www.centralsemi.com
www.diodes.com
www.fairchildsemi.com
www.gensemi.com
www.irctt.com
Central Semiconductor
Diodes Inc.
631-435-1110
805-446-4800
888-522-5372
760-804-9258
361-992-7900
770-436-1300
602-244-6600
847-545-6700
800-348-2496
847-803-6100
847-297-0070
402-564-3131
631-435-1824
805-381-3899
—
Fairchild Semiconductor
General Semiconductor
International Resistive Co. (IRC)
Murata
760-804-9259
361-992-3377
770-436-3030
602-244-4545
847-545-6720
847-925-0899
847-390-4405
847-699-1194
402-563-6296
www.murata.com
www.onsemi.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
www.vishay.com
ON Semiconductor
Sumida
Taiyo Yuden
TDK
TOKO
Vishay Dale
Note: Please indicate you are using the MAX1908 when contacting these manufacturers.
4
_______________________________________________________________________________________
MAX1908 Evaluation Kit
2
3
1
4
5
6
8
7
Figure 1. MAX1908 EV Kit Schematic
_______________________________________________________________________________________
5
MAX1908 Evaluation Kit
Figure 2. MAX1908 EV Kit Component Placement Guide—
Component Side
Figure 3. MAX1908 EV Kit PC Board Layout—Component Side
Figure 4. MAX1908 EV Kit PC Board Layout—Signal and
Ground Layer
Figure 5. MAX1908 EV Kit PC Board Layout—Ground Layer
6
_______________________________________________________________________________________
MAX1908 Evaluation Kit
Figure 6. MAX1908 EV Kit PC Board Layout—Solder Side
Figure 7. MAX1908 EV Kit PC Board 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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 7
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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