L6924D STMicroelectronics, L6924D Datasheet - Page 14
![IC BATTERY CHARGER SYS 16-VFQFPN](/photos/6/58/65862/497-16-vfqfpn_series_sml.jpg)
L6924D
Manufacturer Part Number
L6924D
Description
IC BATTERY CHARGER SYS 16-VFQFPN
Manufacturer
STMicroelectronics
Datasheet
1.L6924D013TR.pdf
(38 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L6924D013TR
Manufacturer:
ST
Quantity:
2 100
Company:
Part Number:
L6924D013TR
Manufacturer:
st
Quantity:
1 950
Company:
Part Number:
L6924D013TR
Manufacturer:
STMicroelectronics
Quantity:
10 000
Operation description
6.2
14/38
Quasi-pulse mode
The quasi-pulse mode can be used when the system can rely on the current limit of the
upstream adapter to charge the battery. In this case, I
current limit of the adapter. In this mode, the L6924D charges the battery with the same
three phases as in linear mode, but the power dissipation is greatly reduced as shown in
Figure
Figure 7.
The big difference is due to the fact that I
During the fast-charge phase, the output voltage of the adapter drops and goes down to the
battery voltage plus the voltage drop across the power MOSFET of the charger, as shown in
the following equation:
Equation 2
Where ΔV
Equation 3
V
V
O PRGTH
I
PRETH
V
PRETH
I
I
CHG
7.
ADP
LIM
MOS
Pre-Charge
Typical charge curves in quasi pulse mode
Phase
is given by:
Doc ID 11908 Rev 9
Fast-Charge
V
IN
Phase
Δ
=
V
V
ADP
MOS
Ilim x Rdson
CHG
=
=
R
is higher than the current limit of the adapter.
V
DS
BAT
(
ON
)
+
×
I
Δ
CHG
LIM
V
Voltage Regulation
MOS
must be set higher than the
Adapter Voltage
Power dissipation
Charge Current
Phase
Battery Voltage
Charge
End
L6924D