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Data Sheet No. PD94146
IRU3027
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPLE LDO CONTROLLER DESCRIPTION
The IRU3027 controller IC is specifically designed to meet VRM 9.0 specification for next generation microprocessor applications requiring multiple on-board regulators. The IRU3027 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 IRU3027 is designed to use either bipolar transistors for Vout3(1.5V) and Vout4(1.8V). No external resistor divider is necessary for any of the regulators. The switching regulator features 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 IRU3027 also features loss-less current sensing for both switchers 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.
FEATURES
Designed to meet VRM 9.0 specification for next generation microprocessors On-Board 5-Bit DAC programs the output voltage from 1.075V to 1.850V in 25mV steps Linear Regulator Controller On-Board for 1.8V 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 1.5V 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 AMD K7 Low Cost Solution
TYPICAL APPLICATION
5V 3.3V LINEAR CONTROL SWITCHER CONTROL Vout1
Vout2
IRU3027
LINEAR CONTROL LINEAR CONTROL Vout4
3027app3-1.0
Vout3
Figure 1 - Typical application of IRU3027.
PACKAGE ORDER INFORMATION
TA (!C) 0 To 70
Rev. 1.4 07/24/01
DEVICE IRU3027CW
PACKAGE 28-Pin Plastic SOIC WB
1
IRU3027
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage .................................................... 7V V12 Supply Voltage .................................................. 20V Storage Temperature Range ...................................... -65 To 150C Operating Junction Temperature Range ..................... 0 To 125C
PACKAGE INFORMATION
28 PIN WIDE BODY PLASTIC SOIC (W)
TOP VIEW
Drive2 1 Fix 2 VID4 3 VID3 4 VID2 5 VID1 6 VID0 7 PGood 8 SD 9 Vsen2 10 Select 11 SS 12 Fault / Rt 13 Vsen4 14
28 V12 27 UGate 26 Phase 25 LGate 24 PGnd 23 OCSet 22 Vsen1 21 Fb 20 V5 19 Vsen3 18 Drive3 17 Gnd 16 Vaux 15 Drive4
JA =80!C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over V12=12V, V5=5V and TA=0 to 70C. Typical values refer to TA=25C. 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 0.6 4.4 0.3 6 30 MAX UNITS V V V V mA
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
0.99Vs
Vs 0.1 0.5
1.01Vs
0.8 2 27 1.5 3.3
V % % V V K V V
Rev. 1.4 07/24/01
2
IRU3027
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 (Vsen4) 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 Hysteresis 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 MAX 2 +2 100 200 -5 Css=0.1F CL=3000pF CL=3000pF 10 70 70 +5 UNITS A mV ns A mV % ns ns
-2 Vdiff=10mV
CL=3000pF Rt=Open TA=25!C, Drive4=Vsen4
200 217 1.800 1.800 2 50
ns KHz V V A mA V V A mA V V V V V V V V V V V V V V V V V A
TA=25!C, Drive3=Vsen3
1.500 1.500 2 50
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 Vsen1 Ramping Up Vsen1 Ramping Down Io=3mA OCSet=0V , Phase=5V
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 1.17Vs 1.15Vs 10 20
Note 1: Vs refers to the set point voltage given in Table 1.
Rev. 1.4 07/24/01
3
IRU3027
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 1.075 1.100 1.125 1.150 1.175 1.200 1.225 1.250 1.275 1.300 1.325 1.350 1.375 1.400 1.425 1.450 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 1.475 1.500 1.525 1.550 1.575 1.600 1.625 1.650 1.675 1.700 1.725 1.750 1.775 1.800 1.825 1.850
Table 1 - Set point voltage vs. VID codes.
PIN DESCRIPTIONS
PIN# 1 2 PIN SYMBOL Drive2 Fix 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 x (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 2V 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 27K 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 27K 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 27K 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 27K 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 27K 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.
3
VID4
4 5 6 7 8
VID3 VID2 VID1 VID0 PGood
4
Rev. 1.4 07/24/01
IRU3027
PIN# 9 PIN SYMBOL PIN DESCRIPTION SD 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 allowing the body diode to conduct and discharge the output capacitor. Vsen2 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. Select 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. SS 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. Fault / Rt 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. Vsen4 This pin provides the feedback for the linear regulator that its output drive is Drive4. Drive4 This pin controls the gate of an external MOSFET for the 1.8V chip set linear regulator. NC This pin has no connection. This pin serves as the ground pin and must be connected directly to the ground plane. Gnd This pin controls the gate of an external transistor for the 1.5V GTL+ linear regulator. Drive3 This pin provides the feedback for the linear regulator that its output drive is Drive3. Vsen3 V5 5V supply voltage. A high frequency capacitor (0.1 to 1F) 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 Fb 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 1000. This pin is internally connected to the under-voltage and over-voltage comparators sensVsen1 ing 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 OCSet 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. PGnd 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 1F) must be connected from V12 pin to this pin for noise free operation. LGate Output driver for the synchronous power MOSFET for the Core supply. Phase 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. UGate Output driver for the high side power MOSFET for the Core supply. V12 This pin is connected to the 12V supply and serves as the power Vcc pin for the output drivers. A high frequency capacitor (typically 1F) 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.
10 11 12
13
14 15 16 17 18 19 20 21
22 23
24 25 26 27 28
Rev. 1.4 07/24/01
5
IRU3027
BLOCK DIAGRAM
V12 V5 SD Vsen1 PGood Vsen3 Vsen4
28 20 9 22 8 19 14 1.1Vset Enable 21 1.17Vset Over Voltage Vset Enable V12 27
Fb UGate
UVLO
+ Slope Comp Soft Start & Fault Logic Osc
PWM Control
V12 25
LGate Phase OCSet PGnd Gnd Fault / Rt SS VID0 VID1 VID2 VID3 VID4
26 Over Current 23
Fix Drive4
2 0.9Vset 15
Enable
200uA
24 17 13
R 1.26V 3R Vset 7 1.5V 3.3V R 3R 6 12
Drive3 Select
18 11
5Bit DAC
5 4
Drive2 Vsen2
3 1
10
Figure 2 - Simplified block diagram of the IRU3027.
6
Rev. 1.4 07/24/01
IRU3027
TYPICAL APPLICATION
12V L1 5V C15 C1 C19 28 V12 9 SD 2 Fix Type Detect 11 Select Phase 26 R1 Vcc3 C22 Q10 16 NC LGate 25 Q11 1 Drive2 R14 PGnd 24 Vsen1 22 Fb 21 R18 VID0 7 18 Drive3 VID1 6 VID2 5 19 Vsen3 VID3 4 VID4 3 Vcc3 R19 PGOOD 8 Q12 15 Drive4 Vsen4 14 Vout4 1.8V C37 Gnd 17 Fault / Rt 13 SS 12 C38 C28 PGood Q7 Q8 C27 20 V5 23 OCSet C17 Q1 R5 Q2 Q3 Q4 L2 L3 D1 C23 Q6 Q9 R8 R10 C24 C29 Vcore C39 C43 C69 C77 C9
R2
R17
R4
C20
R3
UGate 27 Q5
R9
C18
Vout2 1.5V / 3.3V C25
10 Vsen2
U1
R15
IRU3027
Figure 3 - Typical application of IRU3027 for the AMD Slot A socket.
Rev. 1.4 07/24/01
7
IRU3027
IRU3027 APPLICATION PARTS LIST
Dual Layout with HIP6019 Ref Desig Q1, 6 Q2, 3, 4 Q5, 11 Q7, 8, 9 Q10 Q12 D1 L1 L2, 3 C1 C9 C15 C16 C17, 18, 19, 21 C20 C22, 26 C23 C24, 27 C25, 37 C28, 38 C29 C39 C43 C69 C77 R1, 2, 3, 7, 16, 21 R4 R5, 9 R8 R10, 14 R11, 20 R12 R15 R17 R18 R19 Description Transistor MOSFET Transistor MOSFET MOSFET MOSFET Diode Inductor Inductor Capacitor, Ceramic Capacitor, Electrolytic Capacitor, Electrolytic Capacitor, Ceramic Capacitor, Ceramic Capacitor, Ceramic Capacitor, Electrolytic Capacitor, Ceramic Capacitor, Ceramic Capacitor, Electrolytic Capacitor, Ceramic Capacitor, Electrolytic Capacitor, Ceramic Capacitor, Ceramic Capacitor, Ceramic Capacitor, Ceramic Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Resistor Qty 2 3 2 3 1 1 1 1 2 8 6 1 1 4 1 2 1 2 2 2 8 4 26 8 8 6 1 4 1 2 2 1 1 1 1 1 Part # 2SD882, TO-226 package IRF3706S, TO-263 package 2SB772, TO-226 package IRL2203NS, TO-263 package IRLR3103S, TO-252 package IRLR024, TO-252 package MBR1535CT, TO-220 package L=1H, 5052B core with 5 turns of triple 0.8mm wire L=1.8H, 6018 core with 6 turns of triple 0.8mm wire 1F, 0603 10MV1500GX, 1500F, 10V 10MV1500GX, 1500F, 10V 1F, 0603 1F, 0805 220pF, 0603 6MV1000GX, 1000F, 6.3V 1000pF, 0805 1F, 0603 6MV1500GX, 1500F, 6.3V 0.1F, 0603 6MV2200GX, 2200F, 6.3V 4.7F, 0805 1F, 0603 0.01F, 0603 39pF, 0603 10, 5%, 0603 2k, 5%, 0603 1, 5%, 0805 4.7, 5%, 0805 3.3K, 1%, 0603 0, 0603 47K, 5%, 0603 2.2K, 1%, 0603 1, 0603 100K, 1%, 0603 10K, 5%, 0603 Manuf Fairchild IR Fairchild 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

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