MCP73861/2/3/4
Constant-current followed by Constant-voltage.
Figure 6-1 depicts a typical stand-alone application
circuit, while Figures 6-2 and 6-3 depict the
accompanying charge profile.
6.0
APPLICATIONS
The MCP7386X is designed to operate in conjunction
with a host microcontroller or in stand-alone applica-
tions. The MCP7386X provides the preferred charge
algorithm for Lithium-Ion and Lithium-Polymer cells
Unregulated
STAT1
EN VSS2
Wall Cube
16 15 14 13
VSET
1
VBAT3
VBAT2
VBAT1
VSS3
12
11
10
9
+
–
Single
Lithium-Ion
Cell
VDD1
2
MCP73861
VDD2
3
4
VSS1
5
6
7
8
PROG
RPROG
TIMER
CTIMER
RT1
RT2
FIGURE 6-1:
Typical Application Circuit.
Preconditioning
Mode
Constant-Current
Mode
Constant-Voltage
Mode
Regulation
Voltage
(V
)
REG
Regulation
Current
(I
)
REG
Charge
Voltage
Transition
Threshold
(V
)
PTH
Precondition
Current
Charge
Current
(I
)
PREG
Termination
Current
(I
)
TERM
Precondition
Safety Timer
Fast Charge
Safety Timer
Elapsed Time
Termination Timer
FIGURE 6-2:
Typical Charge Profile.
© 2005 Microchip Technology Inc.
DS21893C-page 17
MICROCHIP [ MICROCHIP ]
