Data Sheet No. PD94145 IRU3021M 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPLE LDO CONTROLLER DESCRIPTION FEATURES The IRU3021M controller IC is specifically designed to meet Intel specification for next generation microprocessor applications requiring multiple on-board regulators. The IRU3021M provides a single chip controller IC for the Vcore, three LDO controllers, one with an automatic select pin that connects to the Type Detect pin of the AGP slot for the AGP VDDQ supply, one for GTL+ and the other for the 1.8V chip set regulator as required for the next generation PC applications. The IRU3021M uses N-channel MOSFET as pass transistor for Vout2(VDDQ), Vout3(1.5V) and Vout4(1.8V). No external resistor divider is necessary for any of the regulators. The switching regulator feature a patented topology that in combination with a few external components as shown in the typical application circuit, will provide well in excess of 20A of output current for an on-board DC/DC converter while automatically providing the right output voltage via the 5-bit internal DAC .The IRU3021M also features, lossless current sensing for both switcher by using the RDS(on) of the high-side power MOSFET as the sensing resistor, an output under-voltage shutdown that detects short circuit condition for the linear outputs and latches the system off, 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. Provides single chip solution for Vcore, GTL+, AGP bus, and 1.8V Automatic voltage selection for AGP slot VDDQ supply Linear Regulator Controller On-Board for 1.8V Designed to meet Intel latest VRM specification for next generation microprocessors 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 for all Outputs Synchronous operation allows maximum efficiency Patented architecture allows fixed frequency operation as well as 100% duty cycle during dynamic load Minimum Part Count 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 output APPLICATIONS Total Power Solution for next generation Intel processor application TYPICAL APPLICATION 5V 3.3V Vout2 LINEAR CONTROL SWITCHER CONTROL Vout1 IRU3021M LINEAR CONTROL LINEAR CONTROL Vout3 Vout4 3021Mapp3-1.1 Figure 1 - Typical application of the IRU3021M. PACKAGE ORDER INFORMATION TA (!C) 0 To 70 Rev. 1.4 07/24/01 DEVICE IRU3021MCW PACKAGE 28-Pin Plastic SOIC WB 1 IRU3021M 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 28-PIN WIDE BODY PLASTIC SOIC (W) TOP VIEW Drive2 1 28 V12 Fix 2 27 UGate VID4 3 26 Phase VID3 4 25 LGate VID2 5 24 PGnd VID1 6 23 OCSet VID0 7 22 Vsen1 PGood 8 21 Fb SD 9 20 V5 Vsen2 10 19 Vsen3 Select 11 18 Drive3 SS 12 17 Gnd Fault / Rt 13 16 NC Vsen4 14 15 Drive4 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 V12 V5 Switching Controllers; Vcore (Vsen 1) and AGP (Vsen 2) VID Section (Vcore only) 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 V5 Vsen2 Voltage Select<0.8V Select>2V 2 MIN 0.99Vs TYP MAX UNITS 10 0.6 4.4 0.3 V V V V 6 30 mA Vs 0.1 0.5 1.01Vs 0.8 2 27 1.5 3.3 V % % V V KΩ V V Rev. 1.4 07/24/01 IRU3021M PARAMETER SYM Error Comparator Section Input Bias Current Input Offset Voltage Delay to Output 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) Oscillator Section (Internal) Osc Frequency 1.8V Regulator (Vsen 4) Vsense Voltage Vo4 Vsense Voltage Input Bias Current Output Drive Current 1.5V Regulator (Vsen3) Vsense Voltage Vo3 Vsense Voltage Input Bias Current Output Drive Current Power-Good Section Vsen1 UV Lower Trip Point Vsen1 UV Upper Trip Point Vsen1 UV Hysteresis Vsen1 HV Upper Trip Point Vsen1 HV Lower Trip Point Vsen1 HV Hysterises Vsen2 Trip Point Vsen4 Trip Point Vsen3 Trip Point Power Good Output LO Power Good Output HI Fault (Overvoltage) Section Core OV Upper Trip Point Core OV Lower Trip Point FAULT Output HI Soft-Start Section Soft-Start Current TEST CONDITION MIN TYP -2 Vdiff=10mV MAX UNITS 2 +2 100 µA mV ns +5 200 Css=0.1µF 10 µA mV % CL=3000pF CL=3000pF 70 70 ns ns CL=3000pF 200 ns Rt=Open 217 KHz TA=25!C, Drive4=Vsen4 1.800 1.800 V V µA mA -5 2 Vaux - Vdrive>0.6V 50 TA=25!C, Drive3=Vsen3 1.500 1.500 2 Vaux - Vdrive>0.6V Vsen1 Ramping Down Vsen1 Ramping Up Vsen1 Ramping Up Vsen1 Ramping Down Select<0.8V Select>2V Fix=Gnd Fix=Open Fix=Gnd Fix=Open RL=3mA RL=5K, Pull-Up to 5V 50 0.90Vs 0.92Vs 0.02Vs 1.10Vs 1.08Vs 0.02Vs 1.100 2.560 0.920 1.320 0.920 1.140 0.4 4.8 V V µA mA V V V V V V V V V V V V V V Vsen1 Ramping Up Vsen1 Ramping Down Io=3mA 1.17Vs 1.15Vs 10 V V V OCSet=0V, Phase=5V 20 µA Note 1: Vs refers to the set point voltage given in Table 1. Rev. 1.4 07/24/01 3 IRU3021M D4 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 1.30 1.35 1.40 1.45 1.50 1.55 1.60 1.65 1.70 1.75 1.80 1.85 1.90 1.95 2.00 2.05 D4 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 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 Table 1 - Set point voltage vs. VID codes. PIN DESCRIPTIONS PIN# 1 2 PIN SYMBOL Drive2 Fix 3 VID4 4 VID3 5 VID2 6 VID1 7 VID0 8 PGood 4 PIN DESCRIPTION This pin controls the gate of an external MOSFET for the AGP linear regulator. Leaving this pin open provides fixed output voltages of the 1.5V and 1.8V for the #3 and #4 linear regulators. When this pin is grounded the reference to the linear regulators are set to 1.26V and therefore the output of the regulators can be programmed to any voltages above the 1.26V using: Vout=1.26 × (1 + Rtop/Rbot) Where: Rtop = Top resistor connected from the output to the Vsense pin Rbot = Bottom resistor connected from the Vsense pin to ground This pin selects a range of output voltages for the DAC. When in the LOW state the range is 1.3V to 2.05V and when it switches to HI state the range is 2.0V to 3.5V. This pin is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a 27KΩ resistor to 5V supply. MSB input to the DAC that programs the output voltage. This pin is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a 27KΩ resistor to 5V supply. Input to the DAC that programs the output voltage. This pin is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a 27KΩ resistor to 5V supply. Input to the DAC that programs the output voltage. This pin is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a 27KΩ resistor to 5V supply. LSB input to the DAC that programs the output voltage. This pin is TTL compatible that realizes a logic “1” as either HI or Open. When left open, this pin is pulled up internally by a 27KΩ resistor to 5V supply. This pin is an open collector output that switches LO when any of the outputs are outside of the specified under-voltage trip point. It also switches low when Vsen1 pin is more than 10% above the DAC voltage setting. Rev. 1.4 07/24/01 IRU3021M PIN# 9 PIN SYMBOL SD 10 Vsen2 11 Select 12 SS 13 Fault / Rt 14 15 16 17 18 19 20 Vsen4 Drive4 NC Gnd Drive3 Vsen3 V5 21 Fb 22 Vsen1 23 OCSet 24 PGnd 25 26 LGate Phase 27 28 UGate V12 Rev. 1.4 07/24/01 PIN DESCRIPTION This pin provides shutdown for all the regulators. A TTL compatible, logic level high applied to this pin disables all the outputs and discharges the soft-start capacitor. The SD signal turns off the synchronous MOSFET allowing body diode to conduct and discharge the output capacitor. This pin provides the feedback for the AGP linear regulator. The Select pin when connected to the "Type Detect" pin of the AGP slot automatically selects the right voltage for the AGP VDDQ. This pin provides automatic voltage selection for the AGP switching regulator. When it is pulled LO, the voltage is 1.5V and when left open or pulled to HI, the voltage is 3.3V. This pin provides the soft-start for all the regulators. An internal current source charges an external capacitor that is connected from this pin to ground which ramps up the outputs of the regulators, preventing the outputs from overshooting as well as limiting the input 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 has dual function. It acts as an output of the over-voltage protection circuitry or it can be used to program the frequency using an external resistor. When used as a fault detector, if any of the switcher outputs exceed the OVP trip point, the Fault pin switches to 12V and the soft-start cap is discharged. If the Fault pin is to be connected to any external circuitry, it needs to be buffered. This pin provides the feedback for the linear regulator that its output drive is Drive4. This pin controls the gate of an external MOSFET for the 1.8V chip set linear regulator. This pin is not connected internally. This pin serves as the ground pin and must be connected directly to the ground plane. This pin controls the gate of an external transistor for the 1.5V GTL+ linear regulator. This pin provides the feedback for the linear regulator that its output drive is Drive3. 5V supply voltage. A high frequency capacitor (0.1 to 1µF) must be placed close to this pin and connected from this pin to the ground plane for noise free operation. This pin provides the feedback for the synchronous switching regulator. Typically this pin can be connected directly to the output of the switching regulator. However, a resistor divider is recommended to be connected from this pin to Vout1 and ground to adjust the output voltage for any drop in the output voltage that is caused by the trace resistance. The value of the resistor connected from Vout1 to Fb1 must be less than 1000Ω. This pin is internally connected to the under-voltage and over-voltage comparators sensing the Vcore status. It must be connected directly to the Vcore supply. This pin is connected to the Drain of the power MOSFET of the Core supply and it provides the positive sensing for the internal current sensing circuitry. An external resistor programs the current sense 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. This pin serves as the Power ground pin and must be connected directly to the ground 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. Output driver for the synchronous power MOSFET for the Core supply. This pin is connected to the source of the power MOSFET for the Core supply and it provides the negative sensing for the internal current sensing circuitry. Output driver for the high side power MOSFET for the Core supply. This pin is connected to the 12V supply and serves as the power Vcc pin for the output drivers. A high frequency capacitor (typically 1µF) must be placed close to this pin and PGnd pin and be connected directly from this pin to the ground plane for the noise free operation. 5 IRU3021M BLOCK DIAGRAM V12 V5 SD 28 Vsen1 PGood Vsen3 Vsen4 22 20 Enable UVLO 1.17Vset 9 Vset 1.1Vset Slope Comp 14 2 Drive4 15 0.9Vset Enable PWM Control + 8 Fix Fb 27 UGate 25 LGate 26 Phase 23 OCSet 24 PGnd 17 Gnd 13 Fault / Rt 12 SS V12 Over Voltage 19 21 Enable Soft Start & Fault Logic V12 Osc Over Current 200uA R 1.26V 3R Drive3 18 Select 11 Vset 1.5V 3.3V R 5Bit DAC 7 VID0 6 VID1 5 VID2 4 VID3 3 VID4 3R Drive2 1 Vsen2 10 Figure 2 - Simplified block diagram of the IRU3021M. 6 Rev. 1.4 07/24/01 IRU3021M TYPICAL APPLICATION (Dual Layout with HIP6021) R1 12V L1 C5 5V C1 R2 C4 23 OCSet R4 C3 C2 28 V12 9 SD Q1 UGate 27 2 Fix Type Detect L2 11 Select Phase 26 Vcore R7 Q3 LGate 25 R3 R6 R14 R5 3.3Vin 16 NC (Vaux) C6 Q2 R10 PGnd 24 Vsen1 22 1 Drive2 Fb 21 R9 Vout2 1.5V / 3.3V 10 Vsen2 C13 C7 C22 U1 V5 20 (COMP) IRU3021M C17 C15 R8 C16 C14 R11 R12 VID0 7 Q4 18 Drive3 VID1 6 VID2 5 Vout3 1.5V 19 Vsen3 VID3 4 VID4 3 C18 Vcc3 R13 PGood 8 Q5 15 Drive4 Vsen4 14 PGood Fault / Rt 13 Gnd 17 C21 SS 12 3021Mapp2-1.2 Vout4 1.8V C20 C19 Figure 3 - Typical application of IRU3021M in a dual layout with HIP6021 for an on-board DC-DC converter providing power for the Vcore, GTL+, 1.8V chip set supply as well as auto select AGP supply for the next generation PC applications. Part# HIP6021 IRU3021M S - Short R3 O S R5 S O O - Open R9 O S R12 V O C15 O V C16 C17 V V O O V - See IR or Harris parts list for the value Table 2 - Dual layout component table. Rev. 1.4 07/24/01 7 IRU3021M IRU3021M APPLICATION PARTS LIST Dual Layout with HIP6021 Ref Desig Q1 Q2 Q3 Q4,5 L1 Description MOSFET MOSFET MOSFET with Schottky MOSFET Inductor Qty 1 1 1 2 1 L2 Inductor 1 C1 C2,3 Capacitor, Electrolytic Capacitor, Electrolytic 1 2 C4 C5 C6,18 C7 C13,19 C14,15 C16,17 Capacitor, Ceramic Capacitor, Ceramic Capacitor, Electrolytic Capacitor, Electrolytic Capacitor, Electrolytic Capacitor, Ceramic Capacitor, Ceramic 1 1 2 6 1 2 2 C20,21 C22 R1 R2 R3,5,12 Capacitor, Ceramic Capacitor, Ceramic Resistor Resistor Resistor 2 1 1 1 3 R4,7,14 R6,8,10 R9 R11 R13 Resistor Resistor Resistor Resistor Resistor 3 3 1 1 1 Part # IRL3103S, TO-263 package IRLR3103, TO-252 package IRL3103D1S, TO-263 package IRLR024, TO-252 package L=1µH, 5052 core with 4 turns of 1.0mm wire L=2.7µH, 5052B core with 7 turns of 1.2mm wire 10MV470GX, 470µF, 10V 10MV1200GX, 1200µF, 10V 220pF, 0603 1µF, 0805 6MV1000GX, 1000µF, 6.3V 6MV1500GX, 1500µF, 6.3V 6MV1500GX, 1500µF, 6.3V 1µF, 0603 See Table 2, dual layout component 0603 × 2 0.1µF, 0603 1000pF, 0603 10Ω, 5%, 0603 3.3KΩ, 5%, 0603 See Table 2, dual layout component 0603 × 3 4.7Ω, 5%, 1206 2.2KΩ, 1%, 0603 0Ω, 0603 220KΩ, 1%, 0603 10KΩ, 5%, 0603 Manuf IR IR IR IR Micro Metal Micro Metal Sanyo Sanyo Sanyo Sanyo Sanyo 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 8 Rev. 1.4 07/24/01