IRU3013CW

Data Sheet No. PD94249 IRU3013 VRM 8.5 COMPATIBLE 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER DESCRIPTION The IRU3013 controller IC is specifically designed for Intel Pentium III microprocessor applications as described in the VRM 8.5 specification. The IC provides a single chip solution for the Vcore, 1.2V AGTL+, 1.8V and a third uncommitted LDO controller that can be used either as 1.2V power good detector or to provide 1.5V AGP bus in applications that this voltage is required. The IRU3013 features a patented topology that, in combination with a few external components, (*Note: See application current in figure 3) will provide in excess of 30A of output current for an onboard Vcore synchronous converter while automatically providing the output voltage specified in VRM 8.5 specification. The IRU3013 also features, loss-less current sensing by using the RDS(ON) of the high side Power MOSFET as the sensing resistor, a Power Good window comparator that switches its open collector output low when the output is outside of a ±10% window. Other features of the device are: Under-voltage lockout for both 5V and 12V supplies, an external programmable softstart function, and the ability to program the oscillator frequency by connecting an external capacitor. FEATURES Meets Latest VRM 8.5 Specification Provides Single Chip Solution for Vcore, 1.2V AGTL+, 1.8V and VDDQ On-Board 5-Bit DAC and Decoder programs the output voltage from 1.050V to 1.825V Loss-less Short Circuit Protection Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle when operating with a changing load Minimum Part Count, No External Compensation Soft-Start High current totem pole driver for directly driving an external Power MOSFET Power Good Function APPLICATIONS Pentium III with VRM 8.5 Specification DC to DC Converters TYPICAL APPLICATION 3.3V LINEAR CONTROL VRM 8.5 VID 5V VOUT2 SWITCHER CONTROL VOUT1 IRU3013 LINEAR CONTROL LINEAR CONTROL VOUT3 VOUT4 Figure 1 - Typical application of IRU3013. Note: Pentium III is trade mark of Intel Corp. PACKAGE ORDER INFORMATION TA (°C) 0 To 70 0 To 70 Rev. 1.2 09/06/01 DEVICE IRU3013CW IRU3013CQ PACKAGE 24-Pin Plastic SOIC WB 24-Pin Plastic QSOP 1 IRU3013 ABSOLUTE MAXIMUM RATINGS V5 Supply Voltage .................................................... 10V V12 Supply Voltage .................................................. 20V All Other Pins .......................................................... 7V Storage Temperature Range ...................................... -65°C To 150°C Operating Junction Temperature Range ..................... 0°C To 125°C PACKAGE INFORMATION 24-PIN WIDE BODY PLASTIC SOIC (W) TOP VIEW Ct 1 Lin1 2 VFB1 3 VFB2 4 V5 5 OVP 6 PGd 7 CS- 8 CS+ 9 HDrv 10 PGnd 11 Gnd 12 24 Lin2 23 D0 22 D1 21 D2 20 D3 19 D25 18 VFB3 17 SS 16 Lin4 15 VFB4 14 V12 13 LDrv Ct 1 Lin1 2 VFB1 3 VFB2 4 V5 5 OVP 6 PGd 7 CS- 8 CS+ 9 HDrv 10 PGnd 11 Gnd 12 24-PIN PLASTIC QSOP (Q) TOP VIEW 24 Lin2 23 D0 22 D1 21 D2 20 D3 19 D25 18 VFB3 17 SS 16 Lin4 15 VFB4 14 V12 13 LDrv θJA =80°C/W θJA =88°C/W ELECTRICAL SPECIFICATIONS Unless otherwise specified, these specifications apply over V12=12V, V5=5V and TA=0 to 70°C. Typical values refer to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case temperatures equal to the ambient temperature. PARAMETER VID Section DAC Output Voltage (Note 1) DAC Output Line Regulation DAC Output Temp Variation VID Input LO VID Input HI VID Input Internal Pull-up Resistor to 5V Power Good Section Under-Voltage Lower Trip Point Under-Voltage Upper Trip Point UV Hysteresis Over-Voltage Upper Trip Point Over-Voltage Lower Trip Point OV Hysterises Power Good Output LO Power Good Output HI Soft-Start Section Soft-Start Current SYM TEST CONDITION MIN 0.98Vs 4.5