Datasheet

Enable (EN) Jumper
2-2
2.1 Enable (EN) Jumper
This jumper is used to enable the device. Connecting the EN pin to ENABLE
enables the part. Connecting the EN pin to DISABLE disables the device.
2.2 Mode Selection Jumper
This jumper is used to choose between PWM and PFM/PWM modes of
operation. Setting the jumper across FIXED FREQ forces the device into the
low noise fixed frequency pulse width modulation (PWM) mode. Setting the
jumper across PWR SAVE enables the power save mode where the device
enters a pulse frequency modulation mode (PFM) at light to medium load
currents, which reduces quiescent current and switching frequency to a
minimum to achieve highest efficiency over the entire load current range.