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2.3.1
Input Source
The MCP7384X Evaluation Board is designed to provide typical fast charge currents of
1 A, 275 mA and 500 mA for circuits 1, 2 and 3, respectively. A 5V ±10%, 7.5W input
source should be utilized to power the evaluation kit when evaluating the single cell
charge management devices (MCP73841 and MCP73843). A 10V ±10%, 5W input
source should be utilized to power the evaluation kit when evaluating the dual cell
charge management device (MCP73842). Independent input source connections are
provided for each reference design.
Higher or lower fast charge currents can be obtained by adjusting the value of the
sense resistors (R6//R7, R9//R18 and R8 for circuits 1, 2 and 3, respectively). A
corresponding higher or lower power input source may need to be utilized. Care should
be taken not to over-stress the pass transistors with excessive power dissipation when
higher fast charge currents are desired.
2.3.2
Reverse-Blocking Protection
The MCP7384X Evaluation Board is designed to provide reverse-blocking protection
in the event a reversed polarity input source is connected. The reverse-blocking
protection diodes also ensure that a faulted or shorted input source will not adversely
effect the battery pack.
2.3.3
Battery Headers
Independent battery connections are provided for each reference design. For the
MCP73841 and MCP73842 reference designs, a connection is provided for a nominal
10 k ? at 25°C NTC thermistor situated in the battery pack for temperature sensing.
Installed resistors provide a charging window when the cell temperature is between
-5°C and +55°C when a thermistor with a sensitivity index ( β ) of 3982 is utilized. When
the cell temperature deviates outside the preset window, charging is inhibited. The
desired charging window for a variety of thermistors can be obtained by changing the
values of resistors R4 and R16 or R5 and R17 for circuits 1 and 2, respectively. Refer
to the MCP7384X data sheet (DS21823) for details.
CAUTION: Improper connection of the battery may result in damage to the battery
and the possibility of personal injury. It is also important to avoid
shorting the battery terminals together.
2.3.4
Device Support Options
The MCP7384X Evaluation Board supports the entire MCP7384X family and provides
three reference designs utilizing the MCP73841, MCP73842, and MCP73843.
Alternate devices can be substituted in order to evaluate the different MCP7384X
family options.
2.3.5
Microcontroller option
Connection points provide easily accessible locations for interface to a host
microcontroller. The host microcontroller can be used to disable the charger, monitor
charge status or terminate a charge.
2.3.6
Output voltage options
The MCP7384X Evaluation Board is provided with a constant voltage mode output
voltage of 4.2V and 8.4V for single or dual cell Lithium-Ion/Lithium-Polymer battery
packs, respectively. Evaluation with a constant voltage mode output voltage of 4.1V or
8.2V can be achieved by replacing U1, U2 or U3 with the appropriate device. Refer to
the MCP7384X data sheet (DS21823) for device ordering information.
? 2003 Microchip Technology Inc.
DS51424A-page 5
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