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L6924U Datasheet(PDF) 22 Page - STMicroelectronics

No. de pieza L6924U
Descripción Electrónicos  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  38 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924U Datasheet(HTML) 22 Page - STMicroelectronics

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Applications information: charging process
L6924U
22/38
7.8
Maximum charging time
To avoid the charging of a dead battery for a long time, the L6924U has the possibility can
be set a maximum charging time starting from the beginning of the fast-charge phase. This
timer can be set with a capacitor, connected between the TPRG pin and GND. The CTPRG is
the external capacitor (in nF) and is given by the following formula:
Equation 10
Note:
The maximum recommended CTPRG value must be less than 50 nF.
Figure 15.
TPRG pin connection
Where,
RPRG = resistor which sets the current (RUSB or RAC)
VREF = 1.8 V,
KT = 279 x 10
5,
VBG = 1.23 V, and
TMAXCH is the charging time given in seconds.
If the battery does not reach the end-of-charge condition before the time expires, a fault is
issued.
Also during the pre-charge phase there is a safety timer, given by:
Equation 11
If this timer expires and the battery voltage is still lower than VPRETH, a fault signal is
generated, and the charge process finishes.
Note:
When the device is charged in low power USB mode, in order to take into account the
reduced charge current, the maximum charging time is proportionally increased (five times
the maximum charging time calculated with RUSB)
9
10
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=
REF
PRG
BG
T
MAXCH
TPRG
V
R
V
K
T
C
E
MAXCH
MAXPRECH
T
T
×
=
8
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