L6924U STMicroelectronics, L6924U Datasheet - Page 21

• 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

L6924U
7.5
7.6
7.7
Note:
Recharge flow chart
Figure 14. Recharge flow chart
Recharge threshold
When, from an end-of-charge condition, the battery voltage goes below the recharging
threshold (V
threshold is 4.05 V.
Maximum charging time
To avoid the charging of a dead battery for a long time, the L6924U has the possibility to set
a maximum charging time starting from the beginning of the fast-charge phase. This timer
can be set through a capacitor, connected between the T
external capacitor (in nF) and is given by the following equation:
Equation 10
The maximum recommended C
RCH
), the device goes back in charging state. The value of the recharge
Doc ID 14716 Rev 2
C
TPRG
TPRG
=
value must be less than 50 nF.
⎛
⎜
⎜
⎜
⎜
⎝
T
MAXCH
K
T
Applications information: charging process
V
REF
×
R
V
PRG
BG
⎞
⎟
⎟
⎟
⎟
⎠
×
PRG
10
9
pin and GND. C
E
TPRG
is the
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