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L6924UTR Datasheet(PDF) 4 Page - STMicroelectronics

No. de pieza L6924UTR
Descripción Electrónicos  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
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L6924UTR Datasheet(HTML) 4 Page - STMicroelectronics

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Description
L6924U
4/37
Doc ID 14716 Rev 2
1
Description
The L6924U is a fully monolithic battery charger that safely charges single-cell Li-
Ion/Polymer battery from either an USB power source or an AC adapter. In USB mode, the
L6924U supports both low power and high power mode. Alternatively the device can charge
from an AC wall adapter. The ideal solution for space-limited portable products integrates
the power MOSFET, reverse blocking diode, sense resistor and thermal protection into a
compact VFQFPN16 package. When an external voltage regulated adapter or USB port is
used, the L6924U works in linear mode, and charges the battery in a constant current
constant voltage (CC/CV) profile. Moreover, when a current-limited adapter is used, the
device can operate in quasi-pulse mode, dramatically reducing the power dissipation.
Regardless of the charging approach, a closed loop thermal control avoids device
overheating. The device has an operating input voltage ranging from 2.5 V to 12 V and it
allows the user to program many parameters, such as fast-charge current, end-of-charge
current threshold, and charge timer. The L6924U offers two open collector outputs for
diagnostic purposes, which can be used to either drive two external LEDs or communicate
with a host microcontroller. Finally, the L6924U also provides other features like gas gauge
function, check for battery presence, and monitors and protects the battery from unsafe
thermal conditions.
Figure 2.
Basic application schematic
Figure 1.
Minimum size application board


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