TOBY-L2 and MPCI-L2 series - System Integration Manual
UBX-13004618 - R07
Advance Information
System description
Page 29 of 158
1.5.3
Generic digital interfaces supply output (V_INT)
The generic digital interfaces supply
V_INT
pin is not available on MPCI-L2 series modules.
The
V_INT
output pin of the TOBY-L2 series
modules is connected to an internal 1.8 V supply with current
capability specified in the
[1]. This supply is internally generated by a switching step-
down regulator integrated in the Power Management Unit and it is internally used to source the generic digital
I/O interfaces of the TOBY-L2 module, as described in Figure 12. The output of this regulator is enabled when
the module is switched on and it is disabled when the module is switched off.
Baseband
Processor
70
VCC
71
VCC
72
VCC
5
V_INT
Switching
Step-Down
Power
Management
TOBY-L2 series
Digital I/O
Figure 12: TOBY-L2 series generic digital interfaces supply output (V_INT) simplified block diagram
The switching regulator operates in Pulse Width Modulation (PWM) mode for greater efficiency at high output
loads and it automatically switches to Pulse Frequency Modulation (PFM) power save mode for greater efficiency
at low output loads. The
V_INT
output voltage ripple is specified in the
TOBY-L2 series Data Sheet