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L6924U Datasheet(PDF) 15 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) 15 Page - STMicroelectronics

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L6924U
Operation description
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Where
∆V
MOS is given by:
Equation 3
Where,
ILIM = current limit of the wall adapter, and RDS(on) = resistance of the power MOSFET.
The difference between the programmed charge current and the adapter limit should be
high enough to minimize the RDS(on) value (and the power dissipation). This makes the
control loop completely unbalanced and the power element is fully turned on.
Figure 8 shows the RDS(on) values for different output voltage and charging currents for an
adapter current limit of 500 mA.
Figure 8.
RDS(on) curves vs charging current and output voltage
I
R
V
LIM
ON
DS
MOS
×
=
∆
)
(



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