Figure 17.
Digital power buck-boost converter
JP1
VIN selection
CN7 (top)
VOUT / GND
Embedded
VOUT resistor
loads
JP2 / JP3
headers
The buck-boost converter function
is composed of symmetrical half-bridge topology and works in either Buck,
Boost, or Buck-boost mode. It leverages advanced HRTimers, FMAC, and digital slope compensation
management. It integrates a current regulation in Buck mode and is able to measure average and instantaneous
currents at buck-boost converter input (thanks to ADC and internal comparator). Input and output voltage
regulations are managed thanks to the ADC channels usage. A current sensing function allows implementing
current protection at digital buck-boost converter input VIN.
By default,
double switch function
isolates USB Type-C
®
V
BUS
from the buck-boost converter input. The double
switch is controlled by the activation of BUCKBOOST_USBPD_EN (PC3). Activation of this double switch
connects the USBPD_VBUS to bring power to the buck-boost converter input VIN if JP1 is set correctly.
By default,
the VIN header JP1
selects power source from USBPD_VBUS of USB Type-C
®
CN3 connector, with
a closing jumper to connect USBPD and VIN [1-2]. The user may also want to use external VIN, and in that case,
must connect an external power supply on VIN and GND pins of the JP1 header, and the JP1 jumper must be
removed.
Figure 18.
JP1 VIN default configuration
UM2577
Digital power buck-boost converter
UM2577
-
Rev 2
page 28/54
