L6924U STMicroelectronics, L6924U Datasheet - Page 31

• Manufacturer Part Number: L6924U
• Description: Battery Management USB Battery Charger System w/integra
• Manufacturer: STMicroelectronics

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

L6924U
Figure 25. Demonstration board schematic
Table 7.
Name
RT1
R1
R2
R3
R4
R5
R6
C1
C2
C3
C4
D1
D2
J1
J2
J3
J4
J5
GREEN ST1 LED.
3.3 kΩ
4.7 µF Output capacitor.
24 kΩ
24 kΩ
470 Ω
Value
10 nF
1 kΩ
1 kΩ
1 kΩ
RED
1 µF
1 nF
Demonstration board components description
AC mode fast-charge current resistor. Used to set the charging current in AC mode.
USB mode fast-charge current resistor. Used to set the charging current in USB
mode.
End of Charge current resistor. Used to set the termination current and, as a “gas
gauge” when measuring the voltage across on it.
Pull up resistor. Connected between VREF and TH pin.
Pull up resistor. To be used when the ST1 is connected to a LED
Pull up resistor. To be used when the ST2 is connected to a LED.
If a NTC is not used, a half value of R4 must be mounted to keep the TH voltage in
the correct window.
Input capacitor.
T
V
ST2 LED.
ST2 jumper. Using to select the LED or the external microcontroller.
ST1 jumper. Using to select the LED or the external microcontroller.
SD jumper. If open, the device is in shutdown mode; when closed, the device starts
to work.
Low power/ high power USB mode selection jumper.
AC/USB mode selection jumper.
MAX
REF
capacitor. Used to set the maximum charging time.
filter capacitor.
Doc ID 14716 Rev 2
Description
Additional applications information
31/37