Voltage Regulation - LG GD580 Service Manual

3. Technical brief

3.6. Voltage Regulation

The LDO regulators and the BUCK converter generate a range of programmable voltages, each
optimized for its load. When the analog baseband controller boots up or down, internal signals
activate or deactivate the LDO regulators and the BUCK converter. In active mode, the LDO
regulators and the BUCK converter are activated and deactivated through I2C. The low power
regulator is on all the time and has extremely low power consumption with limited output current. It
provides power for the 32 kHz oscillator and the real-time clock (RTC).
LDO LDO
ABB_LDO A(VBAT_A)
ABB_LDO C(VBAT_E)
ABB_LDO D(VBAT_B)
ABB_LDO E(VBAT_B)
ABB_LDO F(VBAT_F)
ABB_LDO G(VBAT_F)
ABB_LDO H(VBAT_E)
ABB_LDO K(VBAT_G)
ABB_LDO LP(VBAT_G) ABB LDO LP(VBAT G)
ABB_BUCK(VBAT_C)
ABB_SIM LDO(VBAT_D)
LGE Internal Use Only
N t N Net Name O t Output Voltage Output Current t V lt
VRADA_2V8 2.75V
VDDC_2V65 2.75V
VDDD_1V5 1.5V
VDDE_1V8 VDDE 1V8
1.8V
VDIGRAD_1V8
VDDF_2V5 2.5V
VDDG_2V85 2.85V
VDDH_2V75 2.75V
VDDK_2V75 2.75V
VBACKUP VBACKUP 1.5V 1.5V
VCORE 1.2V
SIMVCC 2.85V
Table 3-6-1. LDO and Buck
- 68 -
O t t C t
RF3000, RF3100 Analog
150mA
WCDMA Power Detector
200mA AB3000 BEAR, PCB Version
200mA AB3000 CODECs/ADC/PLL
All I/O Supplies Memory All I/O Supplies, Memory
200mA
RF3000, RF3100 Digital
30mA
100mA
100mA
200mA
6.5mA 6.5mA
600mA
50mA
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Only for training and service purposes
Usage U
DB3150 Analog
SD Card
3AXIS Sensor
Bluetooth
Backup Battery Backup Battery
DB3150 Core
SIM Card