Exact function unknown, but seems to be part of a Motorola mobile handset chipset. This is a whole bunch of support functions on one die: battery charge control, LDOs, USB, audio amplifiers, etc. The other chip in the set is SC29343VKP. For more info:

https://firmware.center/firmware/Motorola/SLVR%20L6%20%28V280%20SLVRcam%29%20%28Lanai%20Blade%29/Service%20Docs/BD_L2_L6_A3_C_L3_V1.1.pdf

Package

(Freescale logo)
SC13890P23A
M97C
CTAD0707A
CHINA

Die

(M) MOTOROLA
INC. 2004

ATLAS-UL
M97C
VERSION 2.3A