This part is a kind of semiconductor called 17550.

Function of this product has Quad H-Bridge Micromotor Driver.

Manufacturers : Freescale Semiconductor

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Some of the text within the PDF file :

Freescale Semiconductor Advance Information Document Number: MPC17550 Rev. 2.0, 7/2006 Quad H-Bridge Micromotor Driver with DC/DC Boost Converter The 17550 is a monolithic quad H-Bridge power IC ideal for portable electronic applications containing tiny bipolar stepper motors and/or brush DC-motors powered by two-to-four cell NiCd/NiMH batteries. The 17550 operates from 2.5 V to 5.5 V, with independent control of each H-Bridge via parallel 3.0 V or 5.0 V logic-compatible I/O. The device features an on-board DC / DC boost converter that allows motor operation all the way down to 1.6 V (the boost converter supplies the gate-drive voltage for each of the four independent H-bridge output stages). Each output bridge has its own gate-drive and logic circuitry with built-in [ ... ]

17550 PDF Datasheet Download