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5
VREG_S3A_1P8
D
VPH_PWR
Pull down CABC pin with
10K if not used
VCHG
VREG_BOOST_BYPASS
C
B
Note: During large battery current transients, the battery voltage seen by the PMIC
can dip below 2.7V. The current that S2A regulator can supply at such voltages
is less than its rated current of 1A. Bhelper LDO aids S2A to provide current
to the load in this scenario.
The alternate parts for Bhelper LDO:
On Semi part NCP706 which is pending on validation.
TP1400
N.M.
6
[11,13]
BOOST_BYP_BYP
3
VPH_PWR
A
On Semi part NCP706MX21TAG
Rev. M
5
4
U1001-6
PM8941
LED
161
VDD_MSM_IO
GND_WLED_SMPS
96
VDD_WLED
112
GND
150
WLED_CABC
CABC
57
VDD_GPLED
R1401
10K
183
VDD_RGB
174
VDD_FLASH
142
VDD_TORCH
U1401
2.1V
7
VPH_PWR
VDD
8
CE
VDD
1
C1404
VOUT
2
2.2uF
VOUT
4
LCON
VFB
VREG_S2A_2P15
5
GND
9
EPAD_GND
C1405
4.7uF
NCP706MX21TAG
4
3
97
VREG_WLED
126
VSW_WLED
134
127
WLED_SNK1
119
WLED_SNK2
104
WLED_SNK3
66
GPLED_SRC1
81
GPLED_SRC2
73
GPLED_SRC3
88
GPLED_SRC4
80
GPLED_SNK1
41
GPLED_SNK2
65
GPLED_SNK3
49
GPLED_SNK4
Rev.E Qualcomm REF design NC GPLED SNK1-4
50
GND
176
RGB_BLU
BLUE_LED_DRV
167
RGB_GRN
GREEN_LED_DRV
160
RGB_RED
RED_LED_DRV
158
FLASH_DRV_1
FLASH_DRV1
190
FLASH_DRV_2
FLASH_DRV2
72
VIB_DRV_N
VIB_DRV_N
78
GND
Connected FLASH_DRV_2 to FLASH_DRV_1
as only one Flash is used.
U1001-7
PM8941
PWR_GND
92
GND
GND
101
GND
GND
107
GND
108
GND
116
GND
122
GND
130
GND
3
2
GPLED_SRC1
[23]
GPLED_SRC2
[23]
GPLED_SNK1
[23]
GPLED_SNK2
[23]
[24]
[24]
[24]
[20]
[20]
[23]
100
115
<Variant Name>
<Variant Name>
<Variant Name>
Lenovo
Lenovo
Lenovo
Title
Title
Title
K920
K920
K920
Size
Size
Size
Document Number
Document Number
Document Number
A4
A4
A4
P14. PM8941 LED & GROUND
P14. PM8941 LED & GROUND
P14. PM8941 LED & GROUND
Date:
Date:
Date:
Tuesday, August 05, 2014
Tuesday, August 05, 2014
Tuesday, August 05, 2014
2
1
D
C
B
A
Rev
Rev
Rev
0.11
0.11
0.11
Sheet
Sheet
Sheet
14
14
14
of
of
of
58
58
58
1
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