Datasheet

 2003-2013 Microchip Technology Inc. DS21823D-page 15
MCP73841/2/3/4
6.0 APPLICATIONS
The MCP7384X is designed to operate in conjunction
with either a host microcontroller or in stand-alone
applications. The MCP7384X provides the preferred
charge algorithm for Lithium-Ion and Lithium-Polymer
cells: constant-current followed by constant-voltage.
Figure 6-1 depicts a typical stand-alone application
circuit, while Figure 6-2 depicts the accompanying
charge profile.
FIGURE 6-1: Typical Application Circuit.
FIGURE 6-2: Typical Charge Profile.
V
DD
V
SS
V
BAT
DRV
THERM
EN
SENSE
1
2
3
4
10
9
8
7
MCP73841
TIMER
5
6
STAT1
Voltage
+
-
Battery
Pack
R
SENSE
C
TIMER
Optional
THREF
R
T1
R
T2
Q
1
Reverse
Blocking
Diode
Regulated
Wall Cube
Regulation Voltage
(V
REG
)
Regulation Current
(I
REG
)
Transition Threshold
(V
PTH
)
Precondition Current
(I
PREG
)
Precondition
Safety Timer
Fast Charge
Safety Timer
Elapsed Time
Termination Timer
Charge
Current
Charge
Voltage
Preconditioning
Phase
Constant-Current
Phase
Constant-Voltage
Phase
Termination Current
(I
TERM
)