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L6924D датащи(PDF) 12 Page - STMicroelectronics

номер детали L6924D
подробное описание детали  Battery charger system with integrated power switch for Li-ION/Li-POLYMER
PDF  38 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924D датащи(HTML) 12 Page - STMicroelectronics

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Operation description
L6924D
12/38
When the VPRE pin is not used to program the Pre-Charge voltage threshold, it has two
different functions:
●
If the voltage across VPRE pin is lower than 0.8V, when I < IENDTH, the end of charge in
notified by the status pin, but the charging process is not disabled. The charge process
ends when the maximum charging time expires.
●
If pin VPRE goes lower than 0.5V the timer is reset on the falling edge.
Battery disconnection control is provided thanks to the differentiated sensing and forcing output
pins. A small current is sunk and forced through VOUT. If VOSNS doesn’t detect the battery, the
IC goes into a standby mode.
Figure 5 shown the real charging profile of a Li-Ion battery, with a Fast Charge current of
450mA (RPRG = 26KΩ),
Figure 5.
Li-Ion charging profile
Charging profile
0.00 0
0.05 0
0.10 0
0.15 0
0.20 0
0.25 0
0.30 0
0.35 0
0.40 0
0.45 0
0.50 0
0
2 00
400
60 0
8 00
10 00
1 200
Charging tim e (sec )
0.00 0
0.50 0
1.00 0
1.50 0
2.00 0
2.50 0
3.00 0
3.50 0
4.00 0
4.50 0
Ichg
Vb att



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