View lb8108m datasheet:

Ordering number : EN4946A Monolithic Digital IC LB8108M Actuator Driver for Portable CD Players • A step-down converter that convert external input Applications voltage that exceed 5 V into 3.5 V VCC operates when The LB8108M is an actuator driver for use in portable CD an external voltage input is applied. This simplifies players that operate at a power supply voltage of 2.4 (two power supply design and thermal design for applying nicad batteries) or 3.0 V (two dry-cell batteries). VCC. (This circuit turns on at the same time an external Functions and Features voltage is applied and generates a 3.5 V VCC, which is • Includes four H bridge driver channels to drive the four utilize for nicad battery charging.) CD player actuators (focus coil, tracking coil, spindle • Buil