P2629/P2643
The P2629/P2643 is a low noise, single-phase brushless fan driver which operates at voltage ranging from 2.2V to 5.5V. It supports three output signals: FG (frequency generator), FGH (frequency generator with 1/2 frequency), LOCK (lock detection).
 
P2619
The P2619 is a current limit single-phase CMOS fan motor driver IC. The switching characteristics are optimized for low-noise operation employing closed-loop amplifiers. It also features direct PWM-controlled speed modulation.