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L6924D Datasheet(PDF) 4 Page - STMicroelectronics

Part # L6924D
Description  Battery charger system with integrated power switch for Li-ION/Li-POLYMER
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924D Datasheet(HTML) 4 Page - STMicroelectronics

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Device description
L6924D
4/38
1
Device description
The L6924D is a fully monolithic battery charger dedicated to single-cell Li-Ion/Polymer battery
packs. It is the ideal solution for space-limited applications, like PDAs, handheld equipment,
cellular phones, and digital cameras. It is designed with BCD6 technology and integrates all of
the power elements (the Power MOSFET, reverse blocking diode and the sense resistor) in a
small VFQFPN16 3mm x 3mm package. When an external voltage regulated wall adapter is
used, the L6924D 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 2.5V to 12V. The L6924D
allows the user to
program many parameters, such as pre-charge current, fast-charge current, pre-charge voltage
threshold, end-of-charge current threshold, and charge timer. The L6924D 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 L6924D also provides very flexible
control of the charge process termination and Gas Gauge capability, as well as other functions,
such as checking for battery presence, and monitoring and protecting the battery from unsafe
thermal conditions.
Figure 2.
Basis application schematic
Figure 1.
Minimum application size


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