IRU3018

Data Sheet No. PD94144 IRU3018 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS LDO CONTROLLER AND 200mA LDO ON-BOARD FEATURES DESCRIPTION Provides single chip solution for Vcore, GTL+ & clock supply 200mA On-Board LDO Regulator Designed to meet the latest Intel specification for Pentium II On-Board DAC programs the output voltage from 1.3V to 3.5V Linear regulator controller on board for 1.5V GTL+ supply Loss-less Short Circuit Protection with HICCUP Synchronous operation allows maximum efficiency patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load Soft-Start High current totem pole driver for direct driving of the external power MOSFET Power Good Function monitors all outputs Over-Voltage Protection circuitry protects the switcher output and generates a fault signal Thermal Shutdown Logic Level Enable Input The IRU3018 controller IC is specifically designed to meet Intel specification for Pentium II microprocessor applications as well as the next generation of P6 family processors. The IRU3018 provides a single chip controller IC for the Vcore, LDO controller for GTL+ and an internal 200mA regulator for clock supply which are required for the Pentium II applications. These devices feature a patented topology that in combination with a few external components as shown in the typical application circuit, will provide in excess of 18A of output current for an onboard DC-DC converter while automatically providing the right output voltage via the 5-bit internal DAC. The IRU3018 also features loss-less current sensing for both switchers by using the RDS(on) of the high-side power MOSFET as the sensing resistor, internal current limiting for the clock supply, and a Power Good window comparator that switches its open collector output low when any one of the outputs is outside of a pre-programmed window. Other features of the device are: Under-voltage lockout for both 5V and 12V supplies, an external programmable soft-start function, programming the oscillator frequency via an external resistor, Over-Voltage Protection (OVP) circuitry for both switcher outputs and an internal thermal shutdown. APPLICATIONS Total Power Solution for Pentium II processor application TYPICAL APPLICATION 5V Note: Pentium II is trademark of Intel Corp IRU3018 SWITCHER1 CONTROL Vout1 3.3V LINEAR CONTROL LINEAR REGULATOR 3018app3-1.1 Vout2 Vout3 Figure 1 - Typical application of IRU3018. PACKAGE ORDER INFORMATION TA (!C) 0 To 70 Rev. 1.5 07/24/01 DEVICE IRU3018CW PACKAGE 24-pin Plastic SOIC WB 1 IRU3018 ABSOLUTE MAXIMUM RATINGS V5 Supply Voltage .................................................... 7V V12 Supply Voltage .................................................. 20V 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 V12 1 VID4 2 VID3 3 VID2 4 VID1 5 VID0 6 PGood 7 V5 8 SS 9 Fault / Rt 10 Fb2 11 Vin2 12 24 UGate1 23 Phase1 22 LGate1 21 PGnd 20 OCSet1 19 Vsen1 18 Fb1 17 En 16 Fb3 15 Gate3 14 Gnd 13 Vout2 θJA =80!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 Supply UVLO Section UVLO Threshold-12V UVLO Hysteresis-12V UVLO Threshold-5V UVLO Hysteresis-5V Supply Current Operating Supply Current SYM TEST CONDITION Supply Ramping Up Supply Ramping Up MIN TYP 10 0.4 4.3 0.3 6 20 0.99Vs Vs 0.1 0.5 27 2 +2 100 200 1.01Vs 0.8 2 MAX UNITS V V V V mA V % % V V KΩ µA mV ns KHz Rev. 1.5 07/24/01 I12 V12 I5 V5 Switching Controller, Vcore (Vout 1) VID Section DAC Output Voltage (Note 1) VDAC DAC Output Line Regulation DAC Output Temp Variation VID Input LO VID Input HI VID Input Internal Pull-Up Resistor to V5 Error Comparator Section Input Bias Current Input Offset Voltage Delay to Output Vdiff=10mV Oscillator Section (Internal) Osc Frequency -2 2 IRU3018 PARAMETER Current Limit Section CS Threshold Set Current CS Comp Offset Voltage Hiccup Duty Cycle Output Drivers Section Rise Time Fall Time Dead Band Time Between High Side and Synch Drive Vcore Switcher Only 2.5V Regulator (Vout 2) Reference Voltage Reference Voltage Dropout Voltage Load Regulation Line Regulation Input Bias Current Output Current Current Limit Thermal Shutdown 1.5V Regulator (Vout 3) Reference Voltage Reference Voltage Input Bias Current Output Drive Current Power Good Section Core UV Lower Trip Point Core UV Upper Trip Point Core UV Hysterises Core OV Upper Trip Point Core OV Lower Trip Point Core OV Hysterises Fb2 Lower Trip Point Fb2 Upper Trip Point Fb3 Lower Trip Point Fb3 Upper Trip Point Power Good Output LO Power Good Output HI Fault (Overvoltage) Section Core OV Upper Trip Point Core OV Lower Trip Point Vin2 Upper Trip Point Vin2 Lower Trip Point Fault Output HI Soft-Start Section Pull-Up Resistor to 5V Enable Section En Pin Input LO Voltage En Pin Input HI Voltage En Pin Input LO Current En Pin Input HI Current SYM TEST CONDITION MIN -5 Css=0.1µF CL=3000pF CL=3000pF CL=3000pF Vo2 TA=25!C, Vout2=Fb2 Io=200mA 1mA< Io