Datasheet

Installation and Operation
© 2007 Microchip Technology Inc. DS51648A-page 9
FIGURE 2-2: Setup Configuration Diagram.
2.3.1.2 APPLYING A LOAD TO THE MCP1630 LOW-COST NIMH BATTERY
CHARGER REFERENCE DESIGN
1. To apply a load to the MCP1630 Low-Cost Li-Ion Battery Charger, the positive
side of the load (B+) should be connected to pin 1 of J2. The negative side of the
load (B-) should be connected to pin 5 of J2. Care should be taken when using
electronic loads or ground referenced loads.
2. A thermistor referenced to (B-) in the battery pack should be utilized, recom-
mended EPCOS Inc. PN B57509m103A5. If a thermistor is not available or not
desired, a 10 k
Ω resistor should be placed between pins 4 and 5 of the battery
header (J2).
3. The installed firmware will prevent the board from entering the 1.3A Fast Charge
mode, if the battery terminal voltage is less than 2V. During power-up, the board
will always trickle charge first, so using a purely resistive load will not work for
trickle and fast-charge current. The best way to evaluate the charger is to use a
three series cell NiMH 2,200 mA/hour batteries, or the recommended simulated
battery load. Refer to Figure 2-3 before applying a load to the MCP1630
Low-Cost NiMH Battery Charger Reference Design.
C1
R1 8 R1 9
R7
C6
C1 2
R8
R1 5
C7 R1 0
C8
C1 3
C1 4
R1 4
C4
J3
R1
R4
R1 7
D2
C9
R1 2
C5
R1 6
J1
R2 1
R9
R6
U2
C3C2 L1
R3
R2
J2
R1 3
R1 1
R5
U3
U4
C1 0
D1
Q1
Input +
Input -
Battery
Header
Programming
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