EVAL6924D Datasheet, PDF (1/4 Pages) STMicroelectronics – EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER

EVAL6924D
EVAL6924D Battery charger system
with integrated Power Switch for Li-ION/Li-POLYMER
Data Brief
General 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 and it 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.
The EVAL6924D Evaluation Board integrates the
linear battery charger as well as the external
components required for a typical application.
The input voltage range can be adjusted between
2.5V and 12V, while the output voltage is selected
by J4, between 4.1V and 4.2V, depending on the
battery type. The fast charge current is set to 500
mA through the 24K R5 resistor.
Evaluation board
November 2006
Rev 1
For further information contact your local STMicroelectronics sales office.
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