MAXIM MAX1909 Technical data
General Description
The MAX1909 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 ✕ the number of series cells in the
battery pack. The number of series cells is jumperselectable. The output voltage is adjustable between
4V to 4.4V (✕ number of series cells) by installing two
resistors. The EV kit provides outputs to monitor the AC
adapter current and the presence of an AC adapter.
The MAX1909 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.
Features
♦ Input Current Limiting
♦ ±0.5% Output Voltage Accuracy Using Internal
Reference
♦ Automatic Selection of System Power Source
♦ Analog Inputs Control Charge Current and
Charge Voltage
♦ Monitor Outputs for
AC Adapter Current
AC Adapter Presence
♦ 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
Quick Start
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.
• Voltmeter
• Battery pack or load
Procedure
The MAX1909 EV kit is a fully assembled and tested
surface-mount board. Follow the steps below to verify
board operation. Do not turn on the power supply
until all connections are completed. Observe all precautions on the battery manufacturer’s data sheet:
1) Set jumper JU1 to indicate the number of cells in
the battery pack (Table 1).
2) Remove the shunt on JU2 to disable the MAX1909.
3) The battery regulation voltage is set to 4.2V per cell.
If a different voltage is required, see the Battery
Regulation Voltage section.
4) The charge current is set to 3A. If a different current
is required, see the Charging Current Limit section.
Evaluates: MAX1909
MAX1909 Evaluation Kit
________________________________________________________________ Maxim Integrated Products 1
Component List
19-2981; Rev 0; 9/03
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.
Ordering Information
查询DS9072H供应商
DESIGNATION QTY DESCRIPTION
10µF ±20%, 25V X5R ceramic
C1, C2 2
capacitors (1812)
Taiyo Yuden TMK432BJ106KM
TDK C4532X5R1E106M
C3 0 Not installed (2220)
22µF ±20%, 25V ceramic capacitor
C4 1
(2220)
TDK C5750X5R1E226M
C5, C6 0 Not installed, E-size capacitors
0.1µF ±10%, 25V X7R ceramic
C7, C9, C12,
C17, C18
C8, C13, C14,
C15
capacitors (0603)
5
Murata GRM188R71E104K
TDK C1608X7R1E104K
0 Not installed, capacitors (0603)
1µF ±10%, 6.3V X5R ceramic
capacitors (0603)
C10, C11, C21 3
Murata GRM188R60J105K
Taiyo Yuden JMK107BJ105KA
TDK C1608X5R1A105K
1µF ±10%, 25V X7R ceramic
capacitor (1206)
C16 1
Murata GRM31MR71E105K
Taiyo Yuden TMK316BJ105KL
TDK C3216X7R1E105K
0.01µF ±10%, 50V X7R ceramic
capacitors (0603)
C19, C20 2
Murata GRM188R71H103K
Taiyo Yuden UMK107B103KZ
TDK C1608X7R1H103K
PART TEMP RANGE IC PACKAGE
MAX1909EVKIT 0°C to +70°C 28 Thin QFN
Evaluates: MAX1909
MAX1909 Evaluation Kit
2 _______________________________________________________________________________________
Component Suppliers
Component List (continued)
Note: Please indicate you are using the MAX1909 when contacting these manufacturers.
DESIGNATION QTY DESCRIPTION
2.2µF ±20%, 35V tantalum capacitor
C22 1
(B-size)
AVX TAJB225M035
Kemet T491B225M035AS
Schottky diode, 0.5A, 30V SOD-123
D1 1
Diodes Inc. B0530W
General Semiconductor MBR0530
ON Semiconductor MBR0530
D2 0 Not installed
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
L1 1
10µH, 4.4A inductor
Sumida CDRH104R-100NC
TOKO 919AS-100M
Single, N-channel, 8.4A, 30V, 8-pin
N1 1
SO MOSFET
Fairchild FDS6612A
Single, P-channel, -5.3A, -30V, 8-pin
P1 1
SO MOSFET
Fairchild FDS9435A
DESIGNATION QTY DESCRIPTION
Single, P-channel, -11A, -30V, 8-pin
P2, P3, P4 3
SO MOSFETs
Fairchild FDS6675
0.01Ω ± 1%, 0.5W sense r esi stor ( 2010)
R1 1
Vishay Dale WSL2010 0.010 1.0%
IRC LRC-LR2010-01-R010-F
0.015Ω ±1%, 0.5W sense resistor
R2 1
(2010)
Vishay Dale WSL2010 0.015 1.0%
IRC LRC-LR2010-01-R015-F
R3, R4, R8,
R13, R14, R15,
R17–R23
0 Not installed, resistors (0603)
R5 1 590kΩ ±1% resistor (0603)
R6 1 196kΩ ±1% resistor (0603)
R7, R12 2 50kΩ potentiometers (multiturn)
R9, R10, R11 3 10kΩ ±5% resistors (0603)
R16 1 33Ω ±5% resistor (0603)
R24 1 10Ω ±5% resistor (0603)
U1 1 MAX1909ETI (28-pin thin QFN-EP)
SUPPLIER PHONE FAX WEBSITE
AVX 843-946-0238 843-626-3123
Diodes Inc. 805-446-4800 805-381-3899
Fairchild Semiconductor 888-522-5372 —
General Semiconductor 760-804-9258 760-804-9259
International Resistive Co.
361-992-7900 361-992-3377
Kemet 864-963-6300 864-963-6322
Murata 770-436-1300 770-436-3030
ON Semiconductor 602-244-6600 602-244-4545
Sumida 847-545-6700 847-545-6720
Taiyo Yuden 800-348-2496 847-925-0899
TDK 847-803-6100 847-390-4405
TOKO 847-297-0070 847-699-1194
Vishay Dale 402-564-3131 402-563-6296
www.avxcorp.com
www.diodes.com
www.fairchildsemi.com
www.gensemi.com
www.irctt.com
www.kemet.com
www.murata.com
www.onsemi.com
www.sumida.com
www.t-yuden.com
www.component.tdk.com
www.tokoam.com
www.vishay.com
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