L6924U STMicroelectronics, L6924U Datasheet - Page 13
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L6924U
Manufacturer Part Number
L6924U
Description
Battery Management USB Battery Charger System w/integra
Manufacturer
STMicroelectronics
Datasheet
1.L6924U.pdf
(37 pages)
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
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
L6924U013TR
Manufacturer:
MICROCHIP
Quantity:
12 500
Company:
Part Number:
L6924UTR
Manufacturer:
ST
Quantity:
2 001
L6924U
Figure 6.
The worst case in power dissipation occurs when the device starts the fast-charge phase. In
fact, the battery voltage is at its minimum value. In this case, there is the maximum
difference between the adapter voltage and battery voltage, and the charge current is at its
maximum value.
The power dissipated is given by the following equation:
Equation 1
The higher the adapter voltage is, the higher the power dissipated is. The maximum power
dissipated depends on the thermal impedance of the device mounted on board.
V
V
OPRGTH
I
PRETH
V
PRETH
I
CHG
ADP
Typical charge curves in linear mode
Pre-Charge
Phase
Adapter Voltage
Doc ID 14716 Rev 2
Fast-Charge
P
DIS
Phase
=
(
V
ADP
−
V
BAT
)
×
Voltage-Regulation
I
CHG
Power dissipation
Battery Voltage
Charge Current
Phase
Operation description
Charge
End
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