LG H990ds Service Manual page 112

16 15 14
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< 1-2-4-3_PT_APT_QFE2101 >
Rev_0.3
J
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+VPWR_BOOST_BYPASS_RF
H
+1V8_VREG_S4A
16.04.26 Global RFFE3 to RFFE2 RFFE2_CLK
RFFE2_DATA
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LGE Internal Use Only
16 15 14
13 12 11 10
QFE2101 for MMPA_1, HMPA
L1601: Buck inductor follow the recommendndation, 80-NF713-111 P_15
C1607: should be 0402 (inch) for better high freq. filtering, Close to Pin11, Pin15
C1607
15 L1601 10u
VDD_BUCK
14
VSW_BUCK
1.5u
11
GND_BUCK
13 12
VDD_BATT BYP_LOAD
5
C_GSM1
6
U1601
C_GSM2
9
QFE2101
AMP_OUT
10
VDD_1P8
C1605
C1699
4 1
SCLK DNC1 4.7u
DNI
3 2
SDATA DNC2
8 7
USID GND
C1606
4.7u
16.05.19 DNI CAP ADDED
13 12 11 10
9 8 7
Bypass booster FAN48623 for RF
2mm
+VPA0
+VPWR
C1800
10u
9 8 7
112
6 5 4
12/22
1.8mm
A3 B3
VIN1 VOUT1
16.06.01
A4 B4
VIN2 VOUT2
L1800
C3
SW1
470n C4
U1800
SW2
FAN48623UC35X_SN00380 B2 C1803 C1802
NC1
0.05mm C2 22u 22u
NC2
R1800 R1801 B1 D1
+VPWR
VSEL AGND
A1 D2
10K DNI
EN PGND1
C1 D3
BOOST_BYP_BYP BYP PGND2
A2 D4
PG PGND3
EN BYP_N VSEL
Vout
X X
0 Boost bypass disabled
1 1 0 For Vin < 3.5V, Vout = 3.5V (Boost mode)
For Vin > = 3.5V, Vout = Vin(bypass mode)
1 1 For Vin < 3.7V, Vout = 3.7V (Boost mode)
1
For Vin > = 3.7V, Vout = Vin (bypass mode)
1 0 X
Vout = Vin (forced bypass mode)
6 5 4
3 2 1
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LG Electronics
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TITLE
S3_MSM8994
SIZE DWG NO REV
A2 PDM NUMBER Rev
DRAWN BY SHEET of Date
User Name 26 22 Drawing Date
3 2 1