ROHM Semiconductor - ROHM Co., Ltd.

ROHM FAQ

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Could buck6's inductor change from 1uH to 0.47uH? Is it for efficiency?
- PMIC was designed under 1uH condition for the best ripple and transient response. If the degradations in ripple and transient response are acceptable, 0.47uH can be an option.

Where are the ground sense features of the opamp listed in the datasheet?
- Ground sense opamps can operate up to the ground level of the input signal. The minimum value listed in the parameter for the common mode input voltage range is 0V (=Ground Level=VEE)

Is it a problem to Pullup the SCL and SDA lines of the I²C interface to 3.3V if DVDD=1.8V?
- 3.3V as the pull up source is acceptable even if DVDD is 1.8V. But NVCC_I2C of the I²C domain in SoC should be 3.3V (the same voltage as the pull up source for PMIC) and DVDD in PMIC always needs to be 1.8V.

Where do you connect the thermal pad of the VSON package for the BU7262NUX, BU7242NUX, BU7462NUX, and BU7442NUX?
- Connect the thermal pad to open or VSS. Since the thermal pad and IC chip are connected, connecting to a signal line may lead to malfunction due to the effects of noise.

Is there any mechanism protecting not allowed I²C access to the PMIC registers?
- As the secure I²C access function, PMIC prepares the REGLOCK register which prohibits the unexpected I²C access during the operation. I²C access is locked by the register as the default setting.

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