DESCRIPTION

The SC1146 is the latest, high performance, multi phase (PWM) controller designed for high power microprocessors requiring ultra fast transient response. The SC1146 is programmable for the voltage range required by the latest Microprocessors . Utilizing a novel and unique design, the controller distributes the output load across (up to) four converter channels by digitally phase shifting the PWM outputs. This approach greatly reduces the stress and heat on the output stage components while lowering input ripple current by as much as 80%. Accurate current sharing among the four phases is achieved by precision design techniques and trimming of critical elements.

FEATURES

• Allows use of small surface mount components

• Ultra fast transient recovery time

• Dramatic reduction of input ripple current and output ripple voltage

• 5-bit programmable DAC for the latest, lower output voltage Microprocessors

• Wide, High frequency operating range

• Selectable 2, 3, 4 phase operation

• +5 Volt only operation eliminates the need for

+12V supply

• Precision load current sharing,1%PWM match

• Selectable internal or external clock

• Soft start/UVLO/Over current protection

APPLICATIONS

• High end servers and workstations

• High current/Ultra-fast transient microprocessors