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L6924D Datasheet(PDF) 34 Page - STMicroelectronics

No. de pieza L6924D
Descripción Electrónicos  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

L6924D Datasheet(HTML) 34 Page - STMicroelectronics

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Application ideas
L6924D
34/38
10
Application ideas
10.1
USB battery charger
With a voltage range between 4.75V and 5.25V, and a maximum current up to 500mA, the USB
power bus is an ideal source for charging a single-cell Li-Ion battery. Since it is not possible to
rely on the USB current limit to charge the battery, a linear approach must be adopted.
Therefore, it is only necessary to set the ICHG with a maximum value lower than 500mA, and
the device will charge the battery in Linear mode.
Figure 28 shows an example of USB charger application schematic.
Figure 28. USB charger application
L6924D
V
IN
V
INSNS
T
PRG
ST1
ST2 SD GND
TH
V
OPRG
I
PRE
V
PRE
I
PRG
V
OSNS
V
OUT
I
END
V
REF
R1
R2
R3
R4
R5
C1
C2
C3
C4
BATTERY
PACK
V
BUS
GND
D- D+
SYSTEM
AND
USB
CONTROLLER



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