The SYNC/MODE pin allows you to synchronize the
converter to an external clock voltage (SYNC). The pin also allows
the selection between two modes (MODE). The following are the
selectable modes:
- Forced
pulse width modulation (FPWM) operation, which
operates at a fixed frequency at all loads in
typical operation
- Auto mode
which automatically switches to pulse-frequency
modulation (PFM) at light loads to improve
light-load efficiency
Connect the SYNC/MODE pin to VCC for FPWM. Connect to GND for
auto. You can also apply a clock signal to synchronize the switching
frequency to an external clock. See
Section 8.3.3
for more information.