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L6924U Folha de dados(PDF) 21 Page - STMicroelectronics

Nome de Peças L6924U
Descrição Electrónicos  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  37 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924U Folha de dados(HTML) 21 Page - STMicroelectronics

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L6924U
Applications information: charging process
Doc ID 14716 Rev 2
21/37
7.5
Recharge flow chart
Figure 14.
Recharge flow chart
7.6
Recharge threshold
When, from an end-of-charge condition, the battery voltage goes below the recharging
threshold (VRCH), the device goes back in charging state. The value of the recharge
threshold is 4.05 V.
7.7
Maximum charging time
To avoid the charging of a dead battery for a long time, the L6924U has the possibility to set
a maximum charging time starting from the beginning of the fast-charge phase. This timer
can be set through a capacitor, connected between the TPRG pin and GND. CTPRG is the
external capacitor (in nF) and is given by the following equation:
Equation 10
Note:
The maximum recommended CTPRG value must be less than 50 nF.
9
10
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=
REF
PRG
BG
T
MAXCH
TPRG
V
R
V
K
T
C
E



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