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LGE Internal Use Only Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3. TECHNICAL DESCRIPTION
3.5.3 Charging Part
The charging block in AB3100 processes the charging operation by using VBAT voltage. It is enabled or
disabled by the assertion/negation of the external signal DCIO. Part of the charging block are activated
and deactivated depending on the level of VBAT. (Fig.3-5-6) shows the schematic of charging part.
Fig. 3-5-6 Battery Block Indication
Fig. 3-5-5. Charging Part
When VBAT is below a certain value, 3.2V, a current generator take care of initial charging of the
CHSENSE+ node and internal trickle charge signal is active. This part of the charging block is powered
on and active when DCIO is asserted. The DCIO signal is asserted when its voltage is above the voltage
at VBAT. As soon as generator is turned off and all parts of the charging block are functional and active.
Battery block indication as shown in (Fig.3-5-7)
Fig. 3-5-6 Battery Block Indication
4.17 ~3.72 (V) 3.72 ~3.62 (V) 3.62 ~3.53 (V) 3.53 ~3.20 (V)
100~40 (%) 40~12 (%) 12~3 (%) 3~0(%)
Direction of BAT and GND
Charging
Route as a differential pair
Phone ground return path
USB charging path
Discharging
Route as a differential pair
Make an Area at 8, 9 Layer
Causion when PCB lLayout
Charging Circuit
22p
C337
VDDC_2V65
VBUS
VDDE_1V8
2
C1
1
D302
KDS221E_RTK
A1_C2
3
A2
0.1u
C346 C347
1u
VBAT_H
1/4W
R324
VBAT
2012
1%
0.025
VBAT
M7
VSS_SPKR
VSS_BEAR
N5
VBUS
E2
P13
VDD_AUDIO
P3
VDD_AUXO
VDD_BEAR
P6
VDD_IO
A12
VDD_REF
G1
VDD_SPKR
P7
A13
VREF
D12
TEST
F2
TRICKLE
VBAT_D
G2
N3
SDAT
B10
SPARE1
A2
SPARE2
IREF
A14
H1
CHSENSEP
DAC_CLK
C4
DAC_DAT
C5
B5
DAC_STR
F1
DCIO
DCIO_INT
J2
J13
FGSENSEN
J14
FGSENSEP
BDATA
A11
CHREG
H3
H2
CHSENSEN
D1
D2
D3
D4
G1
G2
S1
S2
Q300 SIA911DJ
0.1u
C348
VA60 5
varistor
C349
0.1u
300K
R320
C330
22p
C331
33u
D301 RSX101VA-30TR
C345 1u
1%
1/4W
2012
0.1
R316
D1
D2
1
2
3
CN300
1u
R317
VDD_REF
VBAT
R321 100K
R314
0
TRICKLE
FGS+
FGS-
VBUS
CHS-
BDATA
FGS+
DCIO_INT
OTP
VBUS
CHREG
RF_CTRL_DATA
RF_CTRL_CLK
RF_CTRL_STR_1
CHREG
DCIO_INT
FGS-
CHS+
CHS+
BDATA
CHS-
SDAT
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