The SC1109 is a synchronous voltage mode controller (switching section) designed by Semtech, which integrates 2 low-dropout linear regulator controllers. The voltage mode controller provides the power supply for the system AGTL bus. The 1.8V and 2.5V linear controllers power the Chipset and clock circuitry.
The SC1109 is a synchronous PWM controller designed for high-speed motherboards, combining an asynchronous voltage mode controller with two low-dropout linear regulator controllers. The switching section operates at a fixed frequency of 200kHz and features lossless current sensing and latched driver outputs. The integrated 1.8V and 2.5V linear controllers power the chipset and clock circuitry, tracking the 3.3V power supply.
| LDO1 Output Voltage | 1.8V |
|---|---|
| LDO2 Output Voltage | 2.5V |
| Supply Voltage (Vcc) | 4.4V to 5.25V |
| Supply Quiescent Current | 6 to 12 mA |
| Peak DH Source Current | 500 mA |
| Peak DL Source Current | 500 mA |