L6924U STMicroelectronics, L6924U Datasheet - Page 20

• Manufacturer Part Number: L6924U
• Description: Battery Management USB Battery Charger System w/integra
• Manufacturer: STMicroelectronics

Specifications of L6924U

• Product: Charge Management
• Battery Type: Li-Ion
• Output Voltage: 4.2 V
• Output Current: 30 mA
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Package / Case: VFQFPN
• Mounting Style: SMD/SMT
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

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