On page 12 in the TPS63050 datasheet is stated that "power save mode is disabled by setting PFM/PWM pin high".
Also, on page 3: PFM/PWM = High (forced-PWM mode)
On page 18 when comparing the efficiency graphs I think they are reversed:
- Figure 15 & 17. PFM/PWM = High -> efficiency at light loads is good
- Figure 16 & 18. PFM/PWM = Low -> efficiency at light loads is worse
This would mean that power save mode makes no sense?