L6924D STMicroelectronics, L6924D Datasheet - Page 13

• 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

L6924D
charging process is usually terminated when the charging current reaches a set value or
when a charging timer expires
Figure 6
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, this 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. The maximum power
dissipated depends on the thermal impedance of the device mounted on board.
V
V
OPRGTH
I
PRETH
V
PRETH
I
shows the different phases.
CHG
ADP
Typical charge curves in linear mode
Pre-Charge
Phase
Adapter Voltage
Doc ID 11908 Rev 9
(Chapter 7.9 on page
Fast-Charge
P
DIS
Phase
=
(
V
ADP
−
V
BAT
)
22).
×
Voltage-Regulation
I
CHG
Power dissipation
Battery Voltage
Charge Current
Phase
Operation description
Charge
End
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