LISA-U1 series - System Integration Manual
3G.G2-HW-10002-3
Preliminary
System description
Page 17 of 125
1.5
Power management
1.5.1
Power supply circuit overview
LISA-U1 series modules feature a power management concept optimized for the most efficient use of supplied
power. This is achieved by hardware design utilizing a power efficient circuit topology (Figure 4), and by power
management software controlling the module’s power saving mode.
Baseband Processor
2G Power Amplifier
Switching
Step-Down
LISA-U1 series
5 x 10 µF
61
VCC
62
VCC
63
VCC
50
VSIM
2
V_BCKP
4
V_INT
2 x 3G Power Amplifier(s)
Linear
LDO
Linear
LDO
Switching
Step-Down
Linear
LDO
Linear
LDO
Linear
LDO
I/O
EBU
CORE
Analog
SIM
RTC
NOR Flash
DDR SRAM
RF Transceiver
Memory
Power Management Unit
22 µF
10 µF
220 nF
Figure 4: Power management simplified block diagram
Pins with supply function are reported in Table 4, Table 8 and Table 10.
LISA-U1 series modules must be supplied via the
VCC
pins. There is only one main power supply input, available
on the three
VCC
pins that must be all connected to the external power supply
The
VCC
pins are directly connected to the RF power amplifiers and to the integrated Power Management Unit
(PMU) within the module: all supply voltages needed by the module are generated from the
VCC
supply by
integrated voltage regulators.
