View MAX846AEVKIT_362391.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

19-1154; Rev 0; 10/96
MAX846A Evaluation Kit
_______________General Description
The MAX846A evaluation kit (EV kit) is a stand-alone charger for lithium-ion (Li-Ion) batteries. The charging regulator consists of voltage and current loops driving an external, low-cost, PNP pass transistor. In voltageregulation mode, a current-to-voltage converter supplies a voltage proportional to the current flowing through the Li-Ion battery. The float voltage and charging current can be programmed with just two external resistors. The MAX846A EV kit is shipped configured for charging two Li-Ion cells at 800mA from a 10V power source. The MAX846A EV kit is a fully assembled and tested surface-mount printed circuit board.
____________________________Features
o 0.5% Internal Reference for Li-Ion Charging o Regulates Voltage and Current into Battery o Selectable 1 or 2-Cell Li-Ion Charge o 1%, 3.3V, On-Chip, Low-Dropout Linear Regulator o 1A Max Battery Drain when Off o Power-Good Function o Surface-Mount Components o Fully Assembled and Tested
Evaluates: MAX846A
____________________Component List
DESIGNATION QTY C1 C2 C3 C4, C5, C6 C7 D1 Q1 R1, R6 R2 R3 R4 R5 U1 J1 J2 JU1-JU4 JU5 None None None 1 1 1 3 1 1 1 2 1 1 1 1 1 1 1 4 1 0 4 1 DESCRIPTION 22F, 35V electrolytic capacitor Sanyo 35CV22GX 0.1F ceramic capacitors 4.7F, 16V tantalum capacitor Sprague 595D475X0016A2B 0.01F ceramic capacitors 4.7F, 35V electrolytic capacitor Sanyo 35CV4.7GX 1A, 100V fast-recovery diode Nihon EC10DS1 PNP power transistor (SOT-223) Zetex FZT749 0.400, 1%, 1/2W resistors Dale WSL-2010-R400-F or IRC LR2010-01-R400-F 680, 5% resistor 10k, 5% resistor 100k, 5% resistor 825k, 1% resistor Maxim MAX846AEEE PC mount jack RDI Electronics DJ-005 2-pin term connector 3-pin headers 2-pin header 6.0V at 800mA AC adapter (1 cell) James Electronics 14311 (not supplied) 9V at 830mA AC adapter (2 cells) James Electronics 14323 (not supplied) Shunts MAX846A PC board ________________________________________________________________ Maxim Integrated Products 1
______________Ordering Information
PART MAX846EVKIT TEMP. RANGE 0C to +70C BOARD TYPE Surface Mount
______________Component Suppliers
SUPPLIER AVX Dale-Vishay IRC James Electronics Motorola Nichicon Nihon Sanyo Sprague RDI Electronics Vishay/Vitramon Zetex PHONE (803) 946-0690 (800) 282-4975 (402) 564-3131 (512) 992-7900 (312) 463-6500 (602) 303-5454 (847) 843-7500 (805) 867-2555 (619) 661-6835 (603) 224-1961 (914) 773-1000 (203) 268-6261 (516) 543-7100 FAX (803) 626-3123 (402) 563-6418 (512) 992-3377 (312) 463-1504 (602) 994-6430 (847) 843-2798 (805) 867-2698 (619) 661-1055 (603) 224-1430 (914) 773-1111 (203) 452-5670 (516) 864-7630
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX846A Evaluation Kit Evaluates: MAX846A
_________________________Quick Start
The MAX846A Evaluation Kit (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) Place the shunt across JU2's pins to set the number of cells being charged in the battery pack. The EV kit is shipped configured for two lithium-ion (Li-Ion) cells (shunt across pins 1 and 2). 2) Set the charging current with R1 and R6. The charge current is preset for 800mA (R1 = R6 = 400m). For 400mA charge current, remove R6. Consult the battery manufacturer for recommended charging currents. 3) Connect the battery pack to the two-pin power connector J2. Observe the polarity markings. 4) Connect the external supply voltage to the VIN and GND pads. For charging one cell, use a 6V supply; for 2 cells, use a 10V supply. 5) Turn on the power supply to the board and confirm the voltage across the battery using a voltmeter.
Jumper Selection
The three-pin header JU1 selects shutdown mode. Table 2 lists the selectable jumper options.
Table 2. Jumper JU1 Functions
SHUNT LOCATION 1&2 2&3 ON PIN Connected to PWROK Connected to GND MAX846A OUTPUT Enabled Shutdown mode, IBATT < 1A
The three-pin header JU3 disables the voltage-regulation loop. Table 3 lists the selectable jumper options. The MAX846A EV kit is shipped configured for two Li-Ion cells with the voltage-regulation loop enabled.
Table 3. Jumper JU3 Functions
SHUNT LOCATION 1&2 2&3 OFFV PIN Connected to VL Connected to GND CHARGER STATUS Voltage loop disabled Voltage loop enabled
_______________Detailed Description
The MAX846A EV kit is a stand-alone charger for Li-Ion batteries. The charging regulator consists of voltage and current loops driving an external, low-cost, PNP pass transistor (Q1). The MAX846A requires an input 1V greater than the maximum charging voltage. Higher input voltages and charging currents can be used as long as Q1's power dissipation does not exceed 2W. (At 2W, Q1 may exceed +70C). For higher power dissipation and cooler operation, replace Q1 with a TO220 transistor (TIP42) and heatsink in holes provided.
The three-pin header JU4 selects the float-voltage reference. An 825k, 1% resistor is provided for adjusting the float voltage. Table 4 lists the selectable jumper options. The MAX846A EV kit is shipped configured for two Li-Ion cells with the default float voltage reference at 8.4V.
Table 4. Jumper JU4 Functions
SHUNT LOCATION 1&2 2&3 Open VSET PIN Connected to VL Connected to GND Floating FLOAT VOLTAGE Adjust up Adjust down 8.4V for 2 Li-Ion cells, 4.2V for 1 Li-Ion cell
Selecting the Number of Li-Ion Cells
Jumper JU2 selects the number of battery-pack cells. Place the shunt across JU2's pins to select the desired number of cells (Table 1). The MAX846A EV kit is shipped configured for two cells.
Table 1. Jumper JU2 Functions
SHUNT LOCATION 1&2 2&3 CELL2 PIN Connected to VL Connected to GND NUMBER OF CELLS 2 1
The two-pin header JU5 enables adjustment of the current-regulation point. When shorted, a 10k, 5% resistor (R3) connects the ISET pin to GND, and the charging current is determined by R1 and R6. During float charge, the charging current can be monitored at the ISET pin. When open, an external voltage source must be connected between ICNTRL and GND to adjust the charging current. Refer to the Detailed Description in the MAX846A data sheet for more information.
2
_______________________________________________________________________________________
MAX846A Evaluation Kit Evaluates: MAX846A
R6 0.4 R1 0.4
Q1 FZT749 C6 0.01F D1 EC10DS10
J1-1 VIN C1 22F 35V 13 J1-2 GND C2 0.1F VL 2 C3 4.7F 16V C4 0.01F VL 1
R2 680 14 CSCS+ DCIN 6 VSET DRV 16 VL JU4 2 R5 825k 1% 3 1 VSET
U1 MAX846A
12
VL
J2-1 BAT+ C7 4.7F 35V BATTERY J2-2 BATVL R4 100k
BATT
3
CCI PGND
15
5 CCV JU1 2 1 C5 0.01F 11 3 JU2 2 VL 1 10 3 VL JU3 2 1 CELL2 GND 4 ON
ON/OFF
PWROK
9
PWROK
CELL2
ISET
7 R3 10k
ISET
OFFV 8
ICNTRL OFFV JU5 3
Figure 1. MAX846A EV Kit Schematic
_______________________________________________________________________________________
3
MAX846A Evaluation Kit Evaluates: MAX846A
Figure 2. MAX846A EV Kit Component Placement Guide
Figure 3. MAX846A EV Kit PC Board Layout--Component Side
Figure 4. MAX846A 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) 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

▲Up To Search▲

Price & Availability of MAX846AEVKIT

	To Download MAX846AEVKIT Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .