MCP6271R Microchip Technology Inc., MCP6271R Datasheet - Page 15

• Manufacturer Part Number: MCP6271R
• Description: 170 ?a, 2 Mhz Rail-to-rail Op Amp
• Manufacturer: Microchip Technology Inc.

Figure 7: Charge Cycles Using a Switch Mode Charging Solution.
Figure 6: Switch Mode SEPIC Charger.
Charge Cycle Waveforms
Figure 7 depicts complete charge cycles utilizing the switch mode
charging solution. By utilizing a battery monitor in the charging
system, charge cycles can be significantly reduced. The battery
monitor eliminates sensing the voltage produced across the
packs protection circuitry and contact resistance by the charging
current.
Charging Lithium Batteries
5.00
4.50
4.00
3.50
3.00
2.50
2.00
1.50
1.00
0.50
0.00
Switch Mode Charge Cycles with and without PS700, 2200 mAh
0.0
20.0
40.0
60.0
Time (Minutes)
80.0
100.0
120.0
140.0
160.0
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0.00
Conclusion
Properly restoring energy using the latest battery technology
for today’s portable products requires careful consideration. An
understanding of the charging characteristics of the battery and
the application’s requirements is essential in order to design an
appropriate and reliable battery charging system.
Linear and switch mode charging solutions for Li-Ion batteries
were presented. The guidelines and considerations presented
herein should be taken into account when developing any battery
charging system.
References
B. Reddy, New York: McGraw-Hill, Inc., 2002.
“Handbook of Batteries Third Edition”, David Linden, Thomas
http://sanyo.com/batteries/lithium_ion.cfm
“MCP73843 Data Sheet”, Microchip Technology Inc., DS21823.
“MCP73861 Data Sheet”, Microchip Technology Inc., DS21893.
“MCP1630 Data Sheet”, Microchip Technology Inc., DS21896.
“PIC16F684 Data Sheet”, Microchip Technology Inc., DS41202.
“PS700 Data Sheet”, Microchip Technology Inc., DS21760.
Analog and Interface Guide – Volume 2
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