Data Sheet No. PD94249 IRU3013 FEATURES 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. 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 VRM 8.5 VID 5V 3.3V LINEAR CONTROL VOUT2 SWITCHER CONTROL VOUT1 LINEAR CONTROL VOUT4 IRU3013 LINEAR CONTROL VOUT3 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) 24-PIN PLASTIC QSOP (Q) TOP VIEW Ct 1 TOP VIEW 24 Lin2 Ct 1 24 Lin2 Lin1 2 23 D0 Lin1 2 23 D0 VFB1 3 22 D1 VFB1 3 22 D1 VFB2 4 21 D2 VFB2 4 21 D2 V5 5 20 D3 V5 5 20 D3 OVP 6 19 D25 OVP 6 19 D25 PGd 7 18 VFB3 PGd 7 18 VFB3 CS- 8 17 SS CS- 8 17 SS CS+ 9 16 Lin4 CS+ 9 16 Lin4 HDrv 10 15 VFB4 HDrv 10 15 VFB4 PGnd 11 14 V12 PGnd 11 14 V12 13 LDrv Gnd 12 13 LDrv Gnd 12 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 2 SYM TEST CONDITION MIN TYP MAX UNITS 0.98Vs Vs 1.02Vs V 4.5<Vcc<5.5 10.5<V12<13V 0.2 0.5 0.4 2 % % V V 27 KΩ RL = 3mA RL = 5K Pull-Up to 5V 0.90Vs 0.92Vs 0.02Vs 1.10Vs 1.08Vs 0.02Vs 0.3 4.95 V V V V V V V V CS+ = 0V, CS- = 5V 10 µA VOUT Ramping Down VOUT Ramping Up VOUT Ramping Up VOUT Ramping Down Rev. 1.2 09/06/01 IRU3013 PARAMETER UVLO Section UVLO Threshold - 12V UVLO Hysteresis - 12V UVLO Threshold - 5V UVLO Hysteresis - 5V Error Comparator Section Input Offset Voltage Delay to Output Current Limit Section CS Threshold Set Current CS Comp Offset Voltage Hiccup Duty Cycle Supply Current Section Operating Supply Current SYM TEST CONDITION MIN TYP Supply Ramping Up 9 0.5 4 0.3 Supply Ramping Up -2 VDIFF = 10mV 120 -5 150 Css = 0.1µF Output Drivers Section Rise Time Fall Time Dead Band Time Oscillator Section Osc Frequency Osc Valley Osc Peak LDO Controller Section VFB1 and VFB2 (Pins 3 and 4) VFB4 (Pin 15) Input Bias Current Lin 1, 2, 3 Drive Current OVP Section OVP Threshold OVP Source Current MAX CL = 3000pF V5 V12 20 14 CL = 3000pF CL = 3000pF CL = 3000pF 70 70 200 Ct = 150pF 220 UNITS V V V V +2 100 mV ns 200 +5 2 µA mV % mA 100 130 ns ns ns 0.2 KHz V V 2 30 V µA mA 1.17Vs 5 V mA V5 1.200 0.800 Note: Vs refers to the set point voltage given in table 1. D25 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 D3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 D2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 D1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Vs 1.300 1.350 1.400 1.450 1.500 1.550 1.600 1.650 1.700 1.750 1.800 1.050 1.100 1.150 2.200 2.250 D25 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 D3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 D2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 D1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 D0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Vs 1.325 1.375 1.425 1.475 1.525 1.575 1.625 1.675 1.725 1.775 1.825 1.075 1.125 1.175 1.225 1.275 Table 1 - Set point voltage vs. VID codes. Rev. 1.2 09/06/01 3 IRU3013 PIN DESCRIPTIONS PIN# 1 PIN SYMBOL Ct 2 3 4 5 6 Lin1 VFB1 VFB2 V5 OVP 7 PGd 8 CS- 9 CS+ 10 11 HDrv PGnd 12 Gnd 13 14 LDrv V12 15 16 VFB4 Lin4 17 SS 18 VFB3 19 D25 20 D3 21 D2 22 D1 23 D0 24 Lin2 4 PIN DESCRIPTION This pin programs the oscillator frequency in the range of 50 KHz to 500KHz by means of an external capacitor connected from this pin to the ground. Controls the gate of an external MOSFET for the AGTL+ linear regulator or 1.8V supply. This pin provides the feedback for the linear regulator that its output drive is Lin1 pin. This pin provides the feedback for the linear regulator that its output drive is Lin2 pin. 5V supply voltage. This pin provides an over voltage flag when the feedback pin VFB3 voltage exceeds 17%(Typical) of the set point for the Vcore output. This pin is an open collector output that switches LO when the output of the converter is not within ±10% (typ) of the nominal output voltage. When PGd pin switches LO the output saturation voltage is less than 0.4V at 3mA. This pin is connected to the Source of the power MOSFET for the Core supply and it is the negative input for the internal current sensing circuitry. This pin is connected to the Drain of the power MOSFET of the Core supply. It provides the positive sensing input for the internal current sensing circuitry. An external resistor programs the CS threshold depending on the RDS of the power MOSFET. An external capacitor is placed in parallel with the programming resistor to provide high frequency noise filtering. Output driver for the high side power MOSFET. This is the power ground pin and must be connected directly to the gnd plane close to the source of the synchronous MOSFET. A high frequency capacitor (typically 1µF) must be connected from V12 pin to this pin for noise free operation. This pin must be connected directly to the ground plane. A high frequency capacitor (0.1 to 1µF) must be connected from V5 and V12 pins to this pin for noise free operation. Output driver for the power MOSFET, which is used as a synchronous switched rectifier. This pin is connected to the 12V supply and serves as the power Vcc pin for the output drivers. A high frequency capacitor (0.1 to 1µF) must be connected directly from this pin to Gnd pin in order to supply large instantaneous current pulses to the power MOSFET during the transitions. This pin provides the feedback for the linear regulator that its output drive is Lin4 pin. This pin controls the gate of an external MOSFET for either the AGP Bus linear regulator or can be used as Power good detector for 1.2V AGTL+ bus. This pin provides the soft-start for the switching regulator. An internal current source charges an external capacitor that is connected from this pin to the ground which ramps up the outputs of the switching regulator, preventing the outputs from overshooting as well as limiting the inrush current. The second function of the Soft-Start cap is to provide long off time (HICCUP) for the synchronous MOSFET during current limiting. This pin is connected directly to the output of the Core supply to provide feedback to the Error comparator. This pin programs the output voltage in 25mV steps based on the VID table. 40K internal pull-up to Vcc. MSB input to the DAC that programs the output voltage. This pin can be pulled-up externally by a 10K resistor to either 3.3V or 5V supply. 40K internal pull-up to Vcc. Input to the DAC that programs the output voltage. This pin can be pulled-up externally by a 10K resistor to either 3.3V or 5V supply. 40K internal pull-up to Vcc. Input to the DAC that programs the output voltage. This pin can be pulled-up externally by a 10KΩ resistor to either 3.3V or 5V supply. 40K internal pull-up to Vcc. LSB input to the DAC that programs the output voltage. This pin can be pulled-up externally by a 10K resistor to either 3.3V or 5V supply. 40K internal pull-up to Vcc. Controls the gate of an external MOSFET for the AGTL+ linear regulator or 1.8V supply. Rev. 1.2 09/06/01 IRU3013 BLOCK DIAGRAM Enable V12 14 V5 5 Vset 23 D1 22 D2 21 D3 20 D25 19 VFB1 3 Lin1 Enable UVLO PWM Control + Vset D0 18 VFB3 10 HDrv 11 PGnd 13 LDrv 8 CS- 9 CS+ 1 Ct 17 SS 6 OVP 7 PGd 12 Gnd V12 Slope Comp Enable 5Bit DAC, Ctrl Logic Soft Start & Fault Logic V12 Osc Over Current 200uA Enable 1.17Vset 2 1.2V Lin2 24 VFB2 4 Lin4 16 VFB4 15 1.1Vset 0.8V 0.9Vset Figure 2 - Simplified block diagram of the IRU3013. Rev. 1.2 09/06/01 5 6 Q8 2N3904 1 17 10 R10 22K R33 21 Q17 2N7002 R34 10K Vcc12 VID1 22 Enable Vcore PWM Q12 2N7002 R27 1K Clk_Gen_EN# VCC3_Clk_Gen_PWR Intel/SIS_CLK_GEN Q15 2N3904 R32 2.2K Vtt_PGood Q2 D1 30BQ015 SMC size R1 10 0805 C3 470pF close to pin 18 R5 1K5 7 4 C12 1nF close to gate pin R19 10K R16 close to pin 4 10K, 1% close to pin 4 R15 100, 1% R13 10K, 1% close to pin 3 R12 100, 1% close to pin 3 R20 12.6K, 1%_Intel, SIS close to gate pin R17 100 3 2 12 Q4 PMBT2222A close to pin 3 R31 1K Q13 2N3904 SOT-23 R28 10K C16 1nF close to gate pin R11 100 Q7 IRLR024 TO252 432, 1% R14 close to gate TUAL5# Q14 2N7002 SOT-23 R29 1K TUAL5 Vcc Q9 IRLR024 C18 TO252 220uF C14 220uF R8 10K Intel Reference Circuit - Auto CPU Select/Control CPU, AF36 pin Tualatin CPU Vtt(1.25/1.5) close to gate pin R22 100 21.3K, 1%_VIA close to pin 15 R21 10K, 1% close to pin 15 24 18 R9 47K 1% close to pin 18 Sanyo: 10MV1500DX/GX VCORE @ 30A peak Vcc3(ATX) VRM_Power Good Vtt(1.2V/1.5V) TUAL5# Vcc 1.8V @ 2.5A peak_Intel, SIS Vcc 2.5V @ 2.5A peak_VIA C11 1000uF 6.3V C10 1500uF/6.3V Figure 3 - Typical application of IRU3013 for VRM 8.5 specification. C17 1500uF/10V C15 0.1uF C13 1000uF 6.3V Q6 2N7002 C7 1nF close to gate Q5 Vcc3(ATX) IRLR3103 TO252 VDDQ (1.5V/3.3V @ 2A avg) Type Detect# Vcc C10A1 C10B1 C10C1 C10D1 C10E1 C10F2 C10F1 1500uF 1500uF 1500uF 1500uF 1500uF 1500uF 1500uF 10V 10V 10V 10V 10V 10V 10V 6018 core with 7 turns of triple 0.7mm wire R2 3K3 close to pin 18 C4 1uF 2.2uH L2 IRF3704S close to pin 18 TO263 R6 2.2 R7 100 1% close to pin 18 0805 Q3 IRF3704S TO263 8 13 11 16 15 10 R4 5.1 0805 Q1 IRF3711 TO-263 VIA_CLK_GEN 6 VCC3 VID0 23 Q16 IRLML2803 Vcc3 R30 10K Vtt(1.25/1.5) TUAL5 Q10 2N7002 9 R3 3.3K IRU3013 5 C3B2 1500uF 10V C2 220PF Power Sequence for Vtt and Vcore, Similar to that of Intel's C20 1uF 510 Vcc R25 R26 680 2N3904 1N4148 D2 C19 1uF Q11 47K R23 10K R24 Vcc 20 C6 1uF close to pin 5 VID4 VID3 VID2 (VID25) 19 14 C5 1uF close to pin 14 C3B1 1500uF 10V C3A1 1500uF 10V 5052 core with 5 turns Sanyo: 10MV1500DX/GX of 1.2mm wire C1 1000uF 6.3V 1.2uH L1 47K TUAL5# R18 C8 180pF close to pin 1 C9 0.22uF PWM_En 12V +5VIN IRU3013 TYPICAL APPLICATION IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 TAC Fax: (310) 252-7903 Visit us at www.irf.com for sales contact information Data and specifications subject to change without notice. 02/01 Rev. 1.2 09/06/01