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L6924UTR Datasheet(PDF) 22 Page - STMicroelectronics

No. de pieza L6924UTR
Descripción Electrónicos  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  37 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924UTR Datasheet(HTML) 22 Page - STMicroelectronics

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Applications information: charging process
L6924U
22/37
Doc ID 14716 Rev 2
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 timer 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).
MAXCH
MAXPRECH
T
T
×
=
8
1



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