IRU3055
FEATURES
Meets VRM 9.0 Specification 3-Phase Controller with On-Board MOSFET Driver On-Board DAC programs the output voltage from 1.075V to 1.850V Loss-less Short Circuit Protection Programmable Frequency Synchronous operation allows maximum efficiency Minimum Part Count Soft-Start Power Good Function Hiccup Mode Current Limit
DESCRIPTION
The IRU3055 is a 3-phase synchronous Buck controller which provides high performance DC to DC converter for high current applications. The IRU3055 controller IC is specifically designed to meet Intel and AMD specifications for the new microprocessor requiring low voltage and high current. The IRU3055 features under-voltage lockout for both 5V and 12V supplies, an external and programmable softstart function as well as programming the oscillator frequency by using an external resistor.
APPLICATIONS
Intel Pentium 4 and AMD K7
TYPICAL APPLICATION
C1 1u F D1 C2 0.1u F Q1 IRF3704S C3 1u F L1 1u H C4 1000u F
12V
VCH3
VCH12
5V
C5 1u F
Vcc
V CL1 V CL23...
