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L6924UTR Datasheet(PDF) 20 Page - STMicroelectronics

No. de pieza L6924UTR
Descripción Electrónicos  USB compatible battery charger system with integrated power switch for Li-Ion/Li-Polymer
PDF  37 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6924UTR Datasheet(HTML) 20 Page - STMicroelectronics

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Applications information: charging process
L6924U
20/37
Doc ID 14716 Rev 2
7.4
End-of-charge current
When the charge voltage approaches the battery regulated voltage (internally set to 4.2 V),
the voltage regulation phase takes place. The charge current starts to decrease until it goes
below a programmable termination current, IENDTH. This current can be selected by an
external resistor connected between the IEND pin and GND Figure 13, whose value can be
calculated as:
Equation 8
Figure 13.
IEND pin connection
Where KEND is 1050 and VMIN is 50 mV.
When the charge current goes below IENDTH, after a deglitch time, the status pins notify the
end of charge and the charge process ends.
This de-glitch time is expressed as:
Equation 9
where TMAXCH is the maximum charging time. (Chapter 7.7 on page 21)
IEND pin is also used to monitor the charge current, because the current injected in REND is
proportional to the charge current. The voltage across REND can be used by a
microcontroller to check the charge status like a gas gauge.
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
×
=
ENDTH
END
MIN
END
I
K
V
R
E
220
MAXCH
DEGLITCH
T
T
=



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