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L6924U Datasheet(PDF) 18 Page - STMicroelectronics

Part # L6924U
Description  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  38 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924U Datasheet(HTML) 18 Page - STMicroelectronics

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Applications information: charging process
L6924U
18/38
7.2
Pre-charge phase
The L6924U allows pre-charging the battery with a low current when the battery is deeply
discharged.
The battery is considered deeply discharged when its voltage is lower than a threshold
(VPRETH), internally set to 3 V.
During pre-charge phase, the current (IPRECH) has a default value equal to 10 % of the fast-
charge current.
A safety timer is also present. If the battery voltage does not rise over VPRETH within this
time, a fault is given (Chapter 7.8: Maximum charging time on page 22).
If at the beginning of the charge process, the battery voltage is higher than the VPRETH, the
pre-charge phase is skipped.
7.3
AC or USB mode
The L6924U can charge batteries from both AC adapter and USB inputs.
The choice of the power supply is done by driving the MODE pin.
A low level sets the L6924U in AC mode. The fast charge current is determined by the
resistor connected to the IAC pin (Chapter 7.4: Fast charge phase), regardless the resistor
connected to IUSB.
The same way, a high level at the MODE pin sets the L6924U in USB mode. The fast charge
current is determined by the resistor connected to the IUSB pin (Chapter 7.4: Fast charge
phase), regardless the resistor connected to IAC.
Figure 10.
MODE pin selection
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
Sets the fast charge current
I
AC
R
AC
L6924U
MODE
AC adapter mode
R
USB
I
AC
R
AC
L6924U
MODE
USB mode
R
USB
I
USB
V
IN
I
USB
Sets the fast charge current
Sets the fast charge current



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