User's Manual

LISA-U1/LISA-H1 series - System Integration Manual
3G.G2-HW-10002-2 Advance Information System description
Page 16 of 116
1.5 Power management
1.5.1 Power supply circuit overview
LISA-U1/LISA-H1 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/LISA-H1 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
Figure 4: Power management simplified block diagram
Pins with supply function are reported in Table 3, Table 7 and Table 9.
LISA-U1/LISA-H1 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.