OPTIREG™ SBC TLE9274QXV33
DC/DC regulators
6.4.2.3 SBC Stop to Normal mode transition
The microcontroller sends an SPI command to switch from SBC Stop mode to SBC Normal mode. In this
transition, the buck regulator changes the modulation from PFM to PWM.
Once the SPI command for the SBC Normal mode transition is received the current is able to rise above the
specified maximum Stop mode current (IPFM-PWM,TH).
If the transition from SBC Stop mode to SBC Normal mode is carried out when the boost is enabled and
operating, it will continue to operate without any changes.
6.4.3
Buck and boost in SBC Sleep and Fail-Safe mode
In SBC Sleep or Fail-Safe mode, the buck and boost converter are off and not operating. The lowest quiescent
current is achievable.
6.4.3.1 SBC Sleep/Fail-Safe mode to Normal mode transition
In case of a wake-up event from WK pin or transceivers, the SBC will be set SBC Restart mode and as soon as
the reset is released, into SBC Normal mode.
In SBC Restart mode, the buck regulator is activated and ramping. The boost regulator is activated and
ramping again (in case the VS is below the selected threshold) in according the configuration selected in
SBC Normal mode. As soon as the buck output voltage exceeds the reset threshold, the RO pin is released.
Datasheet
38
Rev.2.0
2022-05-06
INFINEON [ Infineon ]
