IRU3055 Datasheet | International Rectifier

Data Sheet No. PD94262 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC PRELIMINARY DATA SHEET TEST SPEC 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 HDrv1 R1 OCSet 2.2K C6 6x 1500u F L2 Ref LDrv1 Rt PGnd1/ OCGnd CS1 SS C9 1u F R3 47K C10 0.1u F D4 PGnd2 D3 CS2 D2 HDrv3 D1 D0 C12 22n F R6 p 27K CS3 Fb LDrv3 PGnd3 HDrv2 Q2 IRF3711S 1u H R2 1.5K C8 1u F 1.5V / 60A LDrv2 Q3 IRF3704S Q4 IRF3711S L3 1u H R4 1.5K C11 1u F Q5 IRF3704S Q6...