EVAL6924D Datasheet, PDF (2/4 Pages) STMicroelectronics – EVAL6924D Battery charger system with integrated Power Switch for Li-ION/Li-POLYMER

Features
1
Features
EVAL6924D
Figure 1. Evaluation board schematic
R3
R9
C4
CHARGER
V _REF
V_IN
TH
V _OUT
C1
V _OSNS
V _INSNS
I_END
R1 R2
T _PRG
I_PRG
C3
C2
L6924D
LD1
LD2
J2 ST2
R4
ST1
J1
SHDN GND V_OPRG
V _PRE
I_PRE
R5
J5
J3 J4
R6
R10
∝C
Vref
R7
R8
NTC
BATTERY
Table 1.
Name
Evaluation board part list
Value
Description
R1
1K
Pull up resistor. To be used when the ST1s connected with a LED
R2
1K
Pull up resistor. To be used when the ST1s connected with a LED
R3
1K
Pull up resistor. Connected between V_REF and TH pin
R4
3K3
End of charge current resistor. Used to set the termination current and, as a
“Gas Gauge“ when measuring the voltage across on it.
R5
24K
Fast-charge current resistor. Used to set the charging current
R6
N.M
V_PRETH resistor. Used to set programmable pre-charge voltage threshold. If
not mounted, the V_PRETHDefault, equal to 2.8V, is set
R7
N.M
I_PRETH resistor. Used to set programmable pre-charge voltage threshold below
the default one. If not mounted, the I_PRETHDefault, is set
R8
68K
I_PRETH resistor. Used to set programmable pre-charge current threshold above
the default one. If not mounted, the I_PRETHDefault, is set
R9
470R
If a NTC is not used, a half value of R3 must be mounted to keep the TH
voltage in the correct window
R10
N.M
It has the same function of R6. Moreover, if it is replaced with a short-circuit,
when J5 is closed, the timer is reset (falling edge)
C1
1µF
Input capacitor
C2
10nF
T_MAX capacitor. Used to set the maximum charging time
C3
1µF
Output capacitor
C4
1µF
V_REF filter capacitor. Not mounted
LD1
GREEN ST1 LED
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