The LX27912IDW from Microsemi Corporation is an LED driver Integrated Circuit with 2 outputs, a step-down (buck) DC-DC controller and PWM dimming, in a 24-SOIC package.
The LX27912DW-TR from Microsemi Corporation is a 2-output LED driver Integrated Circuit with DC-DC step-down (buck) controller and PWM dimming, in a 24-SOIC package.