Mitsumi Electric DW092

The IC ID is per the initial FCC filing for this module.
 * The 4634 prefix is Nikon's.

This may be used in one of their cameras.

Per the FCC photos...
 * The chip used is not easily identifiable (it kind of looks like RT5370P, but dunno).
 * There doesn't appear to be any voltage regulator on-board.