This anomaly applies to Engineering B, build codes CAAA-BA0, QEAA-BA0.
Symptoms
Ripple voltage is increased on BOOST VOUT in High Power mode.
Conditions
The voltage on the VBAT pin is less than 200 mV typical below the target VOUT voltage. BOOST is set either to Forced High Power mode at any load current or to Auto mode while the load current is high enough to set the BOOST into High Power mode.
Consequences
VOUT ripple voltage is increased to the following values:
- 20 mVp-p typical at VOUT=1.8 V
- 60 mVp-p typical at VOUT=3.0 V
VBAT ripple voltage might increase.
Workaround
Avoid using Forced High Power mode when VBAT voltage is close to the target VOUT voltage. If possible, program a higher VOUT voltage level.