Datasheet

2009-2013 Microchip Technology Inc. DS22191E-page 15
MCP73123/223
6.0 APPLICATIONS
The MCP73123/223 is designed to operate with a
host microcontroller or in stand-alone applications.
The MCP73123/223 provides the preferred charge
algorithm for lithium iron phosphate cells, Constant
Current mode followed by Constant Voltage mode.
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 for
Single-Cell LiFePO
4
Battery.
STAT
V
DD
NC
5
3
1
2
PROG
8
7
9
10
4.7 µF
+
-
1-Cell
LiFePO
4
Battery
NC
6
4
1k
V
DD
V
BAT
V
BAT
V
SS
V
SS
4.7 µF
1.0 k
MCP73123 Typical Application
AC-DC Adapter
5V DC Output
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
0 10203040506070
Time (Minutes)
Battery Voltage (V)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Supply Current (A)
V
DD
= 5V
R
PROG
= 1 k
1100 mAh LiFePO
4
Battery
Thermal Regulation