Datasheet

© 2007 Microchip Technology Inc. DS21704B-page 11
MCP73827
6.0 APPLICATIONS
The MCP73827 is designed to operate in conjunction
with a host microcontroller or in stand-alone applica-
tions. The MCP73827 provides the preferred charge
algorithm for Lithium-Ion cells, controlled current fol-
lowed by constant voltage. Figure 6-1 depicts a typical
stand-alone application circuit and Figure 6-2 depicts
the accompanying charge profile.
FIGURE 6-1: Typical Application Circuit.
FIGURE 6-2: Typical Charge Profile.
VOLTAGE
REGULATED
WALL CUBE
PACK+
PACK-
+
-
R
SENSE
GND
V
DRV
V
SNS
V
IN
V
BAT
SHDN
1
2
3
4
8
7
MCP73827
5
6
MODE
I
MON
SINGLE CELL
LITHIUM-ION
22 kΩ
10 µF
100 kΩ
MA2Q705
100 mΩ
NDS8434
10 µF
BATTERY PACK
Q
1
I
OUT
332 Ω
REGULATION
VOLTAGE
(V
REG
)
REGULATION
CURRENT
(I
OUT(PEAK
))
TRANSITION
THRESHOLD
PRECONDITION
CURRENT
CHARGE
CURRENT
CHARGE
VOLTAGE
PRECONDITIONING
PHASE
CONTROLLED CURRENT
PHASE
CONSTANT VOLTAGE
PHASE
MODE - CHARGE
STATUS OUTPUT
I
MON
- CHARGE
CURRENT MONITOR
0V
1.5V
0V
5V