A920:
Voltage
Regulators
Description
Voltage regulation is provided by the PCAP IC (U3000). Multiple regulators are used to provide better isolation between sensitive load circuitry and noisy circuitry.
The regulators and their load circuitry are described below:
· VBOOST_LX(VBOOST_5_5V) - VUSB abd V10 input voltage regulator
· VBUCK_LX(VBUCK_2_25V) - V1, V3, V4, V7, and V8 input voltage regulator
· LX2(VBUCK2_1_6V) - Helen core
· V_VIB - Vibrator
· Vsim2(VSIMC) - SIM card interface
· Vaux1(VRF_TX_2_775V) - RF TX circuits
· Vaux2(VRF_RX_2_775V) - RF RX circuits
· Vaux3(VMMC_2_8V) - SD/MMC interface
· Vaux4(VAUX4_3V) - Image processor, USB xcvrs (Application processor and Bluetooth USB)
· VUSB - PCAP USB xcvr
· V1(VMEM_1_875V) - Application Processor Flash I/O, Application Procesor DRAM I/O, Baseband Processor Flash Core
· V2(VA_2_775V) - Audio
· V3(VLVIO_1_95V) - Magic LV I/O, WCSP
· V4(VRF_REF_1_875V) - RF reference
· V5(VGPS_RF_2_775V) - GPS RF
· V6(VHVIO_2_775V) - HV I/O, Display(20), Imager(12), GPS Baseband(8), GPS Flash, Application Processor SDRAM core(200)
· V7(VRF_DIG_1_875V) - RF digital
· V8(VBLUETH_1_875V) - Bluetooth
· V9(VRF_REF_2_475V) - RF Reference
· V10(VRF_HV_5V) - RF HV
Motor
o
la
Conf
ide
n
tia
l Pr
opr
ie
ta
ry
4-
34
VSIMC
VMMC
VBUCK_2_25V
VBOOST_5_5V
VA_2_775V
VGPS_RF_2_775V
V_VIB
VRF_REF_2_475V
B+
VBOOST_LX
VBUCK_LX
V2
V5
V9
V_VIB
Vsim2
Vaux3
VMEM_1_875V
VLVIO_1_95V
VRF_REF_1_875V
VRF_DIG_1_875V
VBLUETH_1_875V
Vaux1_ Drv
Vaux1
B+
Vaux2_ Drv
Vaux2
B+
VRF_HV_5V
B+
VMAIN_1_55V
U3220
PCAP
PCAP
V1
V3
V4
V7
V8
V10
VUSB_3_3V
VUSB
PCAP
Q3220
VHOLD_EXT_EN
Q3610
Q3502
VRF_TX_2_775V
VRF_REF_2_775V
VRF_RX_2_775V
Switcher
Supply
VHVIO_2_775V
V6_ Drv
V6
B+
Q3403
VBUCK2_1_6V
VOMAP_1_6V
U3980
Q3980
VHOLD_OUT
VAUX4_3V
Vaux4
U3910
B+
VCAM_3V
LX2
CAM_SHUTDOWN
HELEN