L6924D STMicroelectronics, L6924D Datasheet - Page 18

• 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
7.4
18/38
Equation 8
Figure 12. V
Where R
the charge current (see
threshold.
A safety timer is also present. If the battery voltage doesn't rise over V
time is expired, a fault is given (see
of the charge process, the battery voltage is higher than the V
is skipped.
Fast charge current
When the battery voltage reaches the Pre-charge voltage threshold (V
starts the Fast-charge Phase. In this phase, the device charges the battery with a constant
current, I
accuracy of 7%
Equation 9
Figure 13. I
Where K
During this phase, the battery voltage increases until it reaches the programmed output
voltage. A safety timer is also present. If this time expires, a fault is given
Maximum charging
VPRE
PRG
CHG
, programmable by an external resistor that sets the charge current with an
is a constant, equal to 9500.
PRG
PRE
is the resistor between V
Figure
pin connection
pin connection
time).
13. The equation used to select the R
Section 7.4: Fast charge
Doc ID 11908 Rev 9
R
VPRE
Section 7.8: Maximum charging
R
PRG
=
L6924D
L6924D
PRE
R
=
PRG
V
and GND, and R
BG
×
⎛
⎜
⎜
⎝
×
V
V
V
⎛
⎜ ⎜
⎝
PRE
PRE
current), and V
PRETHDefau
K
V
I
R
R
CHG
PRETH
PRG
PRE
PRE
⎞
⎟ ⎟
⎠
lt
⎞
⎟
⎟
⎠
PRG
PRG
PRETH
PRETH
is the resistor used to set
as follows:
time). If at the beginning
, the Pre-Charge phase
PRETH
PRETH
is the selected
(Section 7.8:
, before this
), the L6924D
L6924D