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LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
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
N t N
O t
t V lt
O t
t C
t
U
LDO
Net Name Output Voltage Output Current
Usage
ABB_LDO A(VBAT_A)
VRADA_2V8
2.75V
150mA
RF3000, RF3100 Analog
WCDMA Power Detector
ABB_LDO C(VBAT_E)
VDDC_2V65
2.75V
200mA
AB3000 BEAR, PCB Version
ABB_LDO D(VBAT_B)
VDDD_1V5
1.5V
200mA
AB3000 CODECs/ADC/PLL
VDDE 1V8
All I/O Supplies Memory
ABB_LDO E(VBAT_B)
VDDE_1V8
VDIGRAD_1V8
1.8V
200mA
All I/O Supplies, Memory
RF3000, RF3100 Digital
ABB_LDO F(VBAT_F)
VDDF_2V5
2.5V
30mA
DB3150 Analog
ABB_LDO G(VBAT_F)
VDDG_2V85
2.85V
100mA
SD Card
ABB_LDO H(VBAT_E)
VDDH_2V75
2.75V
100mA
3AXIS Sensor
ABB_LDO K(VBAT_G)
VDDK_2V75
2.75V
200mA
Bluetooth
ABB LDO LP(VBAT G)
VBACKUP
1.5V
6.5mA
Backup Battery
Table 3-6-1. LDO and Buck
ABB_LDO LP(VBAT_G)
VBACKUP
1.5V
6.5mA
Backup Battery
ABB_BUCK(VBAT_C)
VCORE
1.2V
600mA
DB3150 Core
ABB_SIM LDO(VBAT_D)
SIMVCC
2.85V
50mA
SIM Card