Table of Contents
Advertisement
3.1.7 Buck Convertor (SC424, U1&2)
We use two SC424. U2 is for BCM5358U and U1 is for LTE Module. U2 output voltage is set to 3.3V and U1 output
We use two SC424 U2 is for BCM5358U and U1 is for LTE Module U2 output voltage is set to 3 3V and U1 output
voltage is set to 3.75V. The current limit setting is 2.16A same. We use 12V main power source from Adaptor.
The SC424 convert down from 12V to 3.3V and 3.75V for all circuit applications.
FOR N.P POWER [3.3V/2.16A]
R14
100K
C18
C3
100n
1u
C8
2.2u
C15
10u
C115
DNI
R13
DNI
C19
C6
100n
1u
C7
2.2u
C14
C13
10u
10u
LTE_PWR_EN
LGE Internal Use Only
R102
100K
R8
2.7K
R11
100K
30
VIN5
21
LX3
1
20
FB
LX2
2
19
V5V
PGND6
3
U2
18
AGND1
PGND5
SC424
4
17
VOUT
PGND4
EUSY0369702
5
16
VIN
PGND3
6
15
VLDO
LX1
7
BST
31
LX4
C4
1u
NP_EN
VA100
SPPH410100
ESPY0001701
FOR LTE MODULE POWER [3.75V/2.16A]
R103
100K
R7
2.7K
R12
100K
30
VIN5
21
LX3
1
20
FB
LX2
2
19
V5V
U1
PGND6
3
18
AGND1
PGND5
SC424
4
17
VOUT
PGND4
EUSY0369702
5
16
VIN
PGND3
6
15
VLDO
LX1
7
BST
31
LX4
C5
1u
LTE_EN
C126
DNI
KRX102U
EQBA0000601
Figure 3.7 SC424 Circuit Diagram
L100
2.2u
C101
C102
C104
C9
22u
22u
22u
10n
C1
DNI
C12
47p
L101
2.2u
C119
C120
C10
22u
22u
10n
C2
DNI
C11
47p
- 18 -
Copyright © 011 LG Electronics. Inc. All right reserved.
3. TECHNICAL BRIEF
3. TECHNICAL BRIEF
VDD_3.3
Power LED(White)
67-21-L9C-W4556W1X1B2-2T
LD100
R104
C103
10
0.1u
EDLM0009901
C110
DNI
R114
PWR_LED
1K
C116
DNI
VDD_3.75
C105
22u
C121
0.1u
Only for training and service purposes
3
2
Q100
UMT2222A
1
EQBN0005301
Hide quick links:
Advertisement
Table of Contents
Troubleshooting
