This is a kind of IO Controller.
Part Number : IT8586E
Function : Power Management IO Chip for Lenovo
Package : LQFP-128 Pin Type
Manufacturers : ITE, Lenovo
The IT8586 is a highly integrated embedded controller with system functions suitable for mobile system applications. The IT8502 directly interfaces to the LPC bus and provides ACPI embedded controller function, keyboard controller (KBC) and matrix scan, external flash interface for system BIOS and EC code, PWM and ADC for hardware monitor, PS/2 interface for external keyboard/mouse devices, BRAM and system wake up functions for system power management. It also supports the external flash (or EPROM) to be shared by the host and EC side.
Other data sheets within the file : IT8586, IT8586E-FXA