The SYNC pin allows you to synchronize the
converter to an external clock voltage (SYNC). The pin also allows the selection between two
modes. 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 pin to VCC through a 10kOhm resistor for FPWM. Connect to ground for
PFM. You can also apply a clock signal to synchronize the switching frequency to an external
clock. See
Section 7.3.4 for more information.