– 5–13 –
In base-band power management, ADI ADP3522 is designed for all base-band main power supply.
It provides six regulator outputs for VCORE (1.8V), VMEM (2.8V), VANA (2.55V), VRTC (1.95V), VCTCXO (2.75V),
SIMVCC (2.85V). VCORE and VMEM provide all digital power and VANA provides all analog power. VRTC is used to charge
Li-Mn coin cell for real time clock, and VCTCXO is the power source of 13MHz clock buffer. Besides, ADP3522 is also combined
charge pump and hardware reset. The following is the detailed description:
VANA
VCORE
VMEM
VRTC
NReset
VMEM
VMEM
VANA
VBAT
VCORE
Power on detection
and latching
SIMVCC
VCORE
Figure 5.13. Power Management Subsystem Block Diagram
5.5. Power Management Subsystem
LCD
Memory
Battery
Charging
Circuit
ADP3522
AD6525
AD6521
SIM
Circuit
RTC
Circuit
13 MHz