L6924D STMicroelectronics, L6924D Datasheet - Page 20

• Manufacturer Part Number: L6924D
• Description: IC BATTERY CHARGER SYS 16-VFQFPN
• Manufacturer: STMicroelectronics

Specifications of L6924D

• Function: Charge Management
• Battery Type: Lithium-Ion (Li-Ion), Lithium-Polymer (Li-Pol)
• Voltage - Supply: 2.5 V ~ 12 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 16-VFQFN
• Product: Charge Management
• Output Current: 30 mA
• Operating Supply Voltage: 2.5 V to 12 V
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 497-8428 - BOARD EVAL CHARGER ST7260/L6924D497-8247 - BOARD EVAL FOR L6924UTR497-5504 - EVAL BOARD FOR L6924D
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Applications information: charging process
7.6
7.7
7.8
Note:
20/38
Recharge flow chart
Figure 15. Recharge flow chart
Recharge threshold
When, from an end-of-charge condition, the battery voltage goes lower than the recharging
threshold (V
threshold is V
Maximum charging time
To avoid the charging of a dead battery for a long time, the L6924D has the possibility to set
a maximum charging time starting from the beginning of the fast-charge phase. This timer
can be set with a capacitor, connected between the T
external capacitor (in nF) and is given by the following equation:
Equation 11
The maximum recommended C
YES
Detect High Fault
Detect Low Fault
BATTERY
ABSENT
IND FAULT
FAULT
V
V
V
V
FROM CHARGING PROCESS FLOW CHART
V
V
PRETH
RCH
BAT
>
RCH
BAT
<
ABS
BAT
>
NO
NO
NO
OPRG
GO TO BATTERY ABSENT
), the device goes back in charging state. The value of the recharge
YES
YES
–150 mV.
FLOW CHART
Doc ID 11908 Rev 9
C
END of CHARGE
TPRG
TPRG
Detect High
Detect Low
BATTERY
ABSENT
V
V
V
V
V
V
PRETH
BAT
>
RCH
BAT
>
RCH
BAT
>
NO
NO
NO
=
value must be less than 50 nF.
⎛
⎜
⎜
⎜
⎜
⎝
YES
YES
YES
T
MAXCH
K
T
V
FAST CHARGE
PRE CHARGE
REF
×
DETECT LOW = a I
DETECT HIGH = a I
DETECT LOW FAULT = a I
DETECT HIGH FAULT = a I
V
V
T
I
R
V
SINK
ABS
RCH
DET
PRG
BG
= I
= 100ms (Typ.)
= V
= V
INJ
PRG
OPRG
OPRG
= 1mA (Typ.)
⎞
⎟
⎟
⎟
⎟
⎠
×
– 50mV
– 150mV
10
pin and GND. The C
9
SINK
INJ
RETURN TO CHARGING PROCESS
is injected for a T
is sunk for a T
SINK
INJ
is injected for a T
is sunk for a T
FLOW CHART
DET
DET
from the battery
in the battery
DET
DET
from the battery
in the battery
TPRG
L6924D
is the