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MCP73853 Datasheet(PDF) 17 Page - Microchip Technology

Part # MCP73853
Description  USB Compatible Li-Ion/Li-Polymer Charge Management Controllers
PDF  32 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

MCP73853 Datasheet(HTML) 17 Page - Microchip Technology

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 2004-2013 Microchip Technology Inc.
DS21915C-page 17
MCP73853/55
6.0
APPLICATIONS
The MCP7385X devices are designed to operate in
conjunction with a host microcontroller or in stand-
alone applications. The MCP7385X devices provide
the preferred charge algorithm for Li-Ion/Li-Polymer
cells. The algorithm uses a constant current followed
by a constant voltage charging method. Figure 6-1
depicts a typical stand-alone application circuit, while
Figure 6-2 and Figure 6-3 depict the accompanying
charge profile.
FIGURE 6-1:
Typical Application Circuit.
FIGURE 6-2:
Typical Charge Profile.
EN
STAT1
VSET
VSS3
VDD1
VDD2
VSS2
TIMER
PROG
VBAT3
VBAT2
VBAT1
CTIMER
RPROG
RT1
RT2
+
-
Single
Lithium-Ion
Cell
VSS1
1
2
3
4
MCP73853
14
15
16
5678
9
10
11
12
13
Regulated Wall Cube
or
USB Power Bus
Regulation
Voltage
(VREG)
Regulation
Current
(IREG)
Transition
Threshold
(VPTH)
Precondition
Current
(IPREG)
Precondition
Safety Timer
Fast Charge
Safety Timer
Elapsed Time
Termination Timer
Charge
Voltage
Preconditioning
Mode
Constant-current
Mode
Constant-voltage
Mode
Charge
Current
Termination
Current
(ITERM)



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