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Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3. BB Circuit Technical brief
GW520 service manual
3.3.2 Charging control
- GW520 uses external charging IC which is BQ25040
1. Charging method : CC-CV
2. Charger output voltage : 4.9 V
3. Charging time : 2h 30m
4. Charging current : 640 mA
5. CV voltage : 4.2 V
6. Cutoff current : 64 mA
7. Full charge indication current (icon stop current) : 64 mA
8. Recharge voltage : 4.15 V
9. Low battery alarm
a. Idle : 3.45 V ~ 3.35 V
b. Dedicated : 3.45 V ~ 3.35 V
10. Low battery alarm interval
a. Idle : 3 min
b. Dedicated : 1 min
11. Switch-off voltage : 3.35 V
12. Charging temperature adc range
a. ~ -20 : low charging voltage operation (3.6 V ~ 3.9 V) .
℃
b. -20 ~ 60 : standard charging (up to 4.2 V)
℃
℃
c
.
60 ~ : low charging voltage operation (3.6V ~ 3.9V)
℃
RTC ALARM ON
PMIC
0.1u
2V5_VAUDA
R203
DNI
C201
2V85_VBT
2V8_VMME
R217
2V85_VFM
R219
100K
C221
1u
2V62_VIO
2V8_AMP
VUSB
10u
C202
10u
2.2u
C217
C213
TP202
D200
C210
SDB0530
C206
2.2u
1V5_VRF
2.2u
C211
2.2u
2.2u
C230
SDB0530
D201
C225
2.2u
FB201
2.2u
C205
VBAT
2.2u
C222
VBAT
0.1u
C232
VBAT
C227
2.2u
C220
1u
22u
C216
2.2u
C203
C223
2.2u
C218
2.2u
VBAT
10uH
L201
VSS8
VSS9
E6
VSS_MONO
C7
H8
VSS_SD1
VSS_SD2
H4
VSS_VREF
D9
VUMTS
J11
VUSB
A4
F11
VVIB
L3
WDOG
VSS20
VSS21
G4
G5
VSS22
G6
VSS23
VSS24
G7
G8
VSS25
VSS26
G9
H5
VSS27
VSS28
H6
H7
VSS29
VSS3
D5
VSS30
J6
D6
VSS4
VSS5
D7
D8
VSS6
VSS7
E4
E5
VRTC
L11
VSD1
L1
VSD2
G10
VSIM
VSS1
C6
E7
VSS10
VSS11
E8
E9
VSS12
VSS13
F3
F4
VSS14
VSS15
F5
F6
VSS16
VSS17
F7
F8
VSS18
VSS19
F9
D4
VSS2
G3
VDDUMTS
VDD_CHARGE
K9
VDD_MONO
B7
J9
VDD_REF
VDD_USB
B5
VIO
A11
VLED
A8
D3
VMIN
VMME
C11
VPIN
C2
A10
VPLL
C8
VREF
A5
VREFEX_M
VRF1
F10
D11
VRF2
VRF3
E10
H10
A3
B10
TXONP
A
VAFC
H11
VAUDIOA
F2
G1
VAUDIOB
VAUX
H2
F1
VDDAUDIOA
VDDAUDIOB
G2
H1
VDDAUX
C10
VDDMME
VDDPLLIO
B9
E11
VDDRF13_AFC
VDDRF2
D10
K11
VDDSD1
K1
VDDSD2
VDDSIMVIB
G11
H9
E3
J5
RESOURCE_CR
TL
RREF
B8
SD1_FB
J10
L10
SD1_FBL
SD2_FB
K2
L2
SD2_FBL
SE0_VM
B2
L9
SENSE_IN1
SENSE_IN2
K10
SLEEP1_N
E2
E1
SLEEP2_N
SU1_FB
H3
SU1_GATE
J1
J2
SU1_GND
J3
SU1_ISENSE
SUSPEND
K5
C5
MONO_INN
B6
MONO_INP
A6
MONO_OUTN
A7
MONO_OUTP
C4
OE_N
ON_OFF1
K4
L4
ON_OFF2
ON_OFF_OUT
L5
J4
OUTPOR
T
PO
WER_ON
K3
PUMS1
A1
B4
PUMS2
PUMS3
B11
B1
RCV
D1
RESET2_N
RESET_N
AC
+
B3
C3
AC
-
BL1_PWM
L6
K7
BL2_PWM
BL3_PWM
J8
L8
CHARGE_UC
L7
CH_CNTRL
CH_SOURCE
K8
D+
C1
D2
D-
A2
DA
T
_
V
P
FLASH_ON
C9
A9
FLASH_SHINK
I2C_CLK
J7
K6
I2C_D
A
T
I2C_INT
FB200
U200
PMB6821
EUSY0323901
1V35_VPLL
TP200
C208
1u
22u
C229
2V5_VAUDB
R218
100K
2.2u
C224
C200
2
.2u
TP201
C209
0.1u
2.2u
C231
R200
27K
VBAT
1u
C219
1V8_SD
DNI
R214
1V8_SD
R206
0
C214
1V35_CORE
10u
R209
100K
10u
C215
C204
2V9_SIM
1u
C228
2.2u
2V65_TOUCH 2V85_VRF
4.7K
R212
PMRSTn
VBAT
2V85_VLCD
C212
1
u
L200
10uH
C207
0.1u
DNI
R211
VBAT
2.2u
C226
2V11_RTC
DNI
R210
4.7K
R213
RPWRON_EN
RPWR
ON_EN
BT_VCXO_EN
_PPR
PWR
O
N
RTC_OUT
WDOG
PMRSTn
RESOURCE_CTRL
PM_VCXO_EN
USB_DAT_VP
USB_SE0_VM
USB_DP
USB_DM
QWER
TY_KEY_EN
QWER
TY_KEY_BL
I2C1_SCL
I2C1_SD
A
SPO
WER_INT
USB_OEn
GW520 service manual
[Figure3.3.1-1] SM-Power 3 Circuit Diagram