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MAX1640 Evaluation Kit
_______________General Description
The MAX1640 evaluation kit (EV kit) is an adjustable switch-mode current source that operates from a 5.5V to 26V input. It is intended for microprocessor-controlled battery chargers. The charging current, maximum voltage, and pulse-trickle charge are programmed with external resistors. The EV kit is shipped configured for a maximum charge voltage (6 cells). It is configured as a step-down pulse-width modulator (PWM) with synchronous rectification, allowing fast-charge currents up to 1.5A with greater than 90% efficiency. The MAX1640 uses high-side current sense; this allows the load to connect directly to ground, eliminating ground potential errors. The MAX1641 uses low-side current sense. The MAX1640 EV kit is a fully assembled and tested surface-mount printed circuit board. It can also be used to evaluate the MAX1641.
____________________________Features
o 5.5V to 26V Input Voltage Range o Tight Current-Regulation Accuracy: 2% (MAX1641); 5% (MAX1640) o Up to 1.5A Fast-Charge Current o Up to 500kHz PWM Operation o Pulse-Trickle Charge Current o 100% Maximum Duty Cycle (low dropout) o Synchronous Rectifier o Surface-Mount Components o Fully Assembled and Tested
Evaluates: MAX1640/MAX1641
______________Ordering Information
PART MAX1640EVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
Note: To evaluate the MAX1641, request a MAX1641EEE free sample with the MAX1640 EV kit.
_____________________________________________________________Component List
DESIGNATION QTY C1, C8 C2 C3, C6, C7 C4 C5 C9 D1 (optional) J1, J2 J3 L1 2 1 3 1 1 0 0 2 1 1 DESCRIPTION 47F, 35V electrolytic capacitors Sanyo 35CV47GX 0.33F ceramic capacitor 0.1F ceramic capacitors 0.01F ceramic capacitor 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2T Open 1A, 30V Schottky diode Motorola MBRS130LT3 or Nihon EC10QS03 2-pin term connectors 6-pin header 47H power inductor Sumida CDRH125-470, Coilcraft DO3316P-473, or Coiltronics UP2-470 R3, R5 R4, R7, R10 R6, R8, R9 R11 SW1 U1 U2 None None None 2 3 3 0 1 1 1 1 1 1 DESIGNATION QTY R1, R2 2 DESCRIPTION 0.100, 1% 1/2W resistors Dale WSL-2010-R100-F or IRC LR2010-01-R100-F 68k, 5% resistors 200k, 5% resistors 1M, 5% resistors Open 4-position dip switch MAX1640EEE (QSOP-16) Dual P- and N-channel MOSFET (SO-8) International Rectifier IRF7309 or Siliconix Si4539DY MAX1640/MAX1641 data sheet MAX1640/MAX1641 PC board Shunt
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468.
MAX1640 Evaluation Kit Evaluates: MAX1640/MAX1641
______________Component Suppliers
SUPPLIER AVX Coilcraft Coiltronics Dale-Vishay International Rectifier IRC Motorola Nihon Sanyo Siliconix Sprague Sumida Vishay/Vitramon PHONE (803) 946-0690 (847) 639-6400 (561) 241-7876 (402) 564-3131 (310) 322-3331 (512) 992-7900 (602) 303-5454 (805) 867-2555 (619) 661-6835 (408) 988-8000 (603) 224-1961 (847) 956-0666 (203) 268-6261 FAX (803) 626-3123 (847) 639-1469 (561) 241-9339 (402) 563-6418 (310) 322-3332 (512) 992-3377 (602) 994-6430 (805) 867-2698 (619) 661-1055 (408) 970-3950 (603) 224-1430 (847) 956-0702 (203) 452-5670
as the current ramps down at a rate controlled by a resistor from TOFF to ground (R3) and the inductor value. When the off time expires, the P-channel FET is turned back on, and the N-channel FET is turned off.
Selecting the Output Current Levels
Switch SW1 controls the two digital inputs, D0 and D1, that select between four possible current levels (see Table 1). In pulse-trickle mode, the switch is on for 12.5% of the period set by R3, resulting in a lower current for trickle charging. Refer to the Programming the Output Currents section in the MAX1640/MAX1641 data sheet for instructions on selecting the current levels.
Selecting the Number of Cells
Selection of the maximum charge voltage (number of cells) in the MAX1640 EV kit is made via a voltage divider selected by J3. Place the shunt across the J3 pins to select the desired number of cells as indicated by the silkscreen on the board. Refer to the section Setting the Maximum Output Voltage Level in the MAX1640/MAX1641 data sheet for instructions on selecting the resistor-divider values. The EV kit is shipped configured for a maximum charge voltage of 12V (six cells). Refer to Table 2 for the selectable J3 options.
Note: Please indicate that you are using the MAX1640 when contacting these component suppliers.
_________________________Quick Start
The MAX1640 EV kit is fully assembled and tested. Follow these steps to verify board operation. Do not turn on the power supply until all connections are completed. 1) Set the number of cells in the battery pack being charged by placing the shunt across J3, pins 1 and 6. The MAX1640 EV kit is shipped configured for six cells and 1.5A of charge current. 2) Connect the input power supply (26V max) to the 2-pin power connector J1. The input supply must be 1V greater than the maximum battery-charging voltage and capable of providing the charge current. 3) Connect the battery terminals to the 2-pin power connector J2. Observe the polarity markings. 4) Turn on the power supply to the board, and use a voltmeter to confirm the voltage across the battery.
Table 1. Charge-Current Levels (SW1)
D1 0 0 1 1 D0 0 1 0 1 OUTPUT CURRENT 0A, current off 0.375A, top-off charge 0.5A at 12.5% duty cycle, trickle charge 1.5A, fast charge
Table 2. Jumper J3 Functions
SHUNT LOCATION 1 and 6 2 and 5 3 and 4 NUMBER OF CELLS 6 (12V) 2 (4V) (User-defined R11)
_______________Detailed Description
The MAX1640 EV kit is a switch-mode current source that uses a hysteretic current-mode, step-down, pulsewidth-moduled (PWM) topology with constant off time. The switching mechanism is controlled by internal comparators that monitor the current through a sense resistor (R1 or R2) and the voltage at TERM. When the inductor current reaches the current limit, the P-channel FET turns off, and the N-channel FET synchronous rectifier turns on. Inductor energy is delivered to the load
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_______________________________________________________________________________________
MAX1640 Evaluation Kit Evaluates: MAX1640/MAX1641
__________Evaluating the MAX1641
The MAX1640 EV kit can also be used to evaluate the MAX1641. Replace the MAX1640 with the MAX1641, cut jumpers JU2 and JU4, and install jumpers JU1 and JU3. Table 3 summarizes the JU1-JU4 functions.
Table 3. Jumper JU1-JU4 Functions
JUMPER JU1 JU2 JU3 JU4 MAX1641 LOW-SIDE SENSE Short Open Short Open MAX1640 HIGH-SIDE SENSE Open Short Open Short
VIN GND
VL
J1-1 C3 0.1F C2 0.3F 6 16 SW1B 2 R8 1M 4 D0 IN 15 LDOH PDRV 14 8 SW1A 1 R3 68k 3 R9 1M 13 2 1 12 11 10 R6 1M R10 200k R11 OPEN 7 U2A D1 D1 MBR5130 (OPTIONAL) JU2A JU2B JU3B JU3B R2 0.1 JU4 L1 47H JU1 R1 0.1 C9 OPEN 5 4 3 U2B C8 4.7F 35V C1 4.7F 35V
J1-2
BAT+
J2-1
3
4
U1 MAX1640
NDRV
2 6
TOFF REF SET
PGND CS+ CS-
BATJ2-2
C6 0.1F
R4 200k
7
R5 68k
5
CC GND 9
VSET
C4 0.01F
TERM LDOL 1
8
1 R7 200k C5 4.7F 16V
J3 6
2 CELLS
VL C7 0.1F
2
5
6 CELLS
3
4
X CELLS
Figure 1. MAX1640 EV Kit Schematic
_______________________________________________________________________________________
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MAX1640 Evaluation Kit Evaluates: MAX1640/MAX1641
1.0"
Figure 2. MAX1640 EV Kit Component Placement Guide-- Component Side
1.0"
1.0"
Figure 3. MAX1640 EV Kit PC Board Layout--Component Side
Figure 4. MAX1640 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.
4 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 1997 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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