OPTIREG™ SBC TLE9274QXV33
DC/DC regulators
6
DC/DC regulators
6.1
Block description
The SMPS module in the TLE9274QXV33 is implemented as a cascade of a step-up pre-regulator followed by a
step-down post-regulator. The step-up pre-regulator (DC/DC boost converter) provides a VS level which
permits the step-down post-regulator (DC/DC buck converter) to regulate without entering a low-drop
condition.
The SMPS module is active in SBC Normal, Stop and Restart mode. In SBC Sleep and Fail-Safe mode, the SMPS
module is disabled.
Comparator
VSENSE
D1
L1
D2
Vbat
SPI
VSUP
VS
Boost
Converter
C1
C2
C3
BSTD
BSTG
T1
SNSP
SNSN
Rsense
Feedforward
Buck
Converter
L2
BCKSW
C4
C5
GND
Bandgap
Reference
VCC1
Soft Start
Ramp
Generator
Figure 6
DC/DC block diagram
Functional features
•
•
3.3 V SMPS (DC/DC) buck converter with integrated high-side and low-side power switching transistor
SMPS (DC/DC) boost converter as pre-regulator for low VSUP supply voltage (down to 3 V) with
configurable output voltage via SPI
•
•
Fixed switching frequency for buck and boost converter in SBC Normal mode in PWM (Pulse Width
Modulation)
PFM (Pulse Frequency Modulation) for buck converter in SBC Stop mode to reduce the quiescent current
Datasheet
29
Rev.2.0
2022-05-06
INFINEON [ Infineon ]
