IRF IRU3027

Data Sheet No. PD94146
IRU3027
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
WITH TRIPLE LDO CONTROLLER
FEATURES
DESCRIPTION
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
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 V DDQ 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.
APPLICATIONS
Total power solution for next generation Intel
processor application
AMD K7 Low Cost Solution
TYPICAL APPLICATION
5V
3.3V
LINEAR
CONTROL
VOUT 2
SWITCHER
CONTROL
VOUT1
IRU3027
LINEAR
CONTROL
LINEAR
CONTROL
VOUT 3
VOUT4
Figure 1 - Typical application of IRU3027.
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
Rev. 1.5
07/17/02
DEVICE
IRU3027CW
www.irf.com
PACKAGE
28-Pin Plastic SOIC WB
1
IRU3027
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage ....................................................
V12 Supply Voltage ..................................................
Storage Temperature Range ......................................
Operating Junction Temperature Range .....................
7V
20V
-65 To 150°C
0 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 V SEN1
PGood 8
21 Fb
SD 9
20 V5
V SEN2 10
19 V SEN3
Select 11
18 Drive3
SS 12
17 Gnd
Fault / Rt 13
16 NC
V SEN4 14
15 Drive4
uJA =808C/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 (V SEN 1) and AGP (V SEN 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
VSEN 2 Voltage
Select <0.8V
Select >2V
2
MIN
www.irf.com
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
KV
V
Rev. 1.5
07/17/02
IRU3027
PARAMETER
Error Comparator Section
Input Bias Current
Input Offset Voltage
Delay to Outout
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 (V SEN 4)
VSEN Voltage
VSEN Voltage
Input Bias Current
Output Drive Current
1.5V Regulator (V SEN 3)
VSEN Voltage
VSEN Voltage
Input Bias Current
Output Drive Current
Power Good Section
VSEN 1 UV Lower Trip Point
VSEN 1 UV Upper Trip Point
VSEN 1 UV Hysterises
VSEN 1 HV Upper Trip Point
VSEN 1 HV Lower Trip Point
VSEN 1 HV Hysterises
VSEN 2 Trip Point
VSEN 3 Trip Point
VSEN 4 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
Pull-Up Resistor to 5V
SYM
TEST CONDITION
MIN
TYP
-2
VDIFF=10mV
MAX UNITS
2
+2
100
mA
mV
ns
+5
Css=0.1mF
10
mA
mV
%
CL=3000pF
CL=3000pF
CL=3000pF
70
70
200
ns
ns
ns
Rt=Open
217
KHz
1.800
1.800
V
V
mA
mA
200
-5
VO4
TA=258C, Drive4=VSEN 4
2
50
VO3
TA=258C, Drive3=VSEN 3
1.500
1.500
2
50
VSEN 1 Ramping Down
VSEN 1 Ramping Up
V
V
mA
mA
Select <0.8V
Select >2V
Fix=Gnd
Fix=Open
Fix=Gnd
Fix=Open
RL=3mA
RL=5K, Pull-Up to 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
V
V
V
V
V
V
V
VSEN 1 Ramping Up
VSEN 1 Ramping Down
Io=3mA
1.17Vs
1.15Vs
10
V
V
V
OCSet=0V, Phase=5V
20
mA
VSEN 1 Ramping Up
VSEN 1 Ramping Down
V
V
V
V
Note 1: Vs refers to the set point voltage given in Table 1.
Rev. 1.5
07/17/02
www.irf.com
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
4
PIN SYMBOL
Drive2
Fix
3
VID4
4
VID3
5
VID2
6
VID1
7
VID0
8
PGood
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 3 (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 27KV 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 27KV 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
27KV 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
27KV 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 27KV 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 V SEN 1 pin is more than
10% above the DAC voltage setting.
www.irf.com
Rev. 1.5
07/17/02
IRU3027
PIN#
9
PIN SYMBOL
SD
10
VSEN 2
11
Select
12
SS
13
Fault / Rt
14
15
16
17
18
19
20
VSEN 4
Drive4
NC
Gnd
Drive3
VSEN 3
V5
21
Fb
22
VSEN 1
23
OCSet
24
PGnd
25
26
LGate
Phase
27
28
UGate
V12
Rev. 1.5
07/17/02
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 allowing the 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 has no connection.
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 1mF) 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 1000V.
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 1mF) 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 1mF) 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.
www.irf.com
5
IRU3027
BLOCK DIAGRAM
V12
28
V5
20
SD
9
VSEN1
22
PGood
8
VSEN3
19
VSEN4
Fix
Enable
UVLO
1.17Vset
Drive4
Vset
Enable
27
UGate
25
LGate
26
Phase
23
OCSet
24
PGnd
17
Gnd
13
Fault / Rt
12
SS
PWM
Control
+
1.1Vset
V12
Slope
Comp
14
0.9Vset
Fb
V12
Over
Voltage
2
21
Enable
Soft
Start &
Fault
Logic
Osc
Over
Current
200uA
15
R
1.26V
3R
Drive3
18
Select
11
Vset
1.5V
5-Bit
DAC
3.3V
R
7
VID0
6
VID1
5
VID2
4
VID3
3
VID4
3R
Drive2
1
VSEN2
10
Figure 2 - Simplified block diagram of the IRU3027.
6
www.irf.com
Rev. 1.5
07/17/02
IRU3027
TYPICAL APPLICATION
12V
C9
L1
R2
R17
R4
C20
R3
5V
C15
C19
C1
C27
V12
V5
SD
C17
OCSet
Q2
Q3
Q4
R5
L2
UGate
Fix
Type Detect
Q1
Q5
L3
Select
D1
C39
Phase
R1
Q6
NC
Vcc3
Q10
Q7
Q8
Q9
R9
R8
C24
C25
Vcore
R14
PGnd
V SEN1
V SEN2
C77
C29
Q11
Drive2
V OUT 2
1.5V / 3.3V
C69
R10
LGate
C18
C22
C43
C23
U1
R15
Fb
IRU3027
R18
VID0
Drive3
VID1
VID2
VSEN3
VID3
VID4
Vcc3
R19
PGOOD
Q12
Drive4
V SEN4
V OUT 4
1.8V
Fault / Rt
Gnd
PGood
C28
SS
C38
C37
Figure 3 - Typical application of IRU3027 for the AMD Slot A socket.
Rev. 1.5
07/17/02
www.irf.com
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
Description
Transistor
MOSFET
Transistor
MOSFET
MOSFET
MOSFET
Diode
Inductor
L2, 3
Inductor
2
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
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Ceramic
8
6
1
1
4
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Electrolytic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Ceramic
Capacitor, Ceramic
Resistor
1
2
1
2
2
2
8
4
26
8
8
6
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Qty
2
3
2
3
1
1
1
1
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=1mH, 5052B core with 5 turns of
triple 0.8mm wire
L=1.8mH, 6018 core with 6 turns of
triple 0.8mm wire
1mF, 0603
10MV1500GX, 1500mF, 10V
10MV1500GX, 1500mF, 10V
1mF, 0603
1mF, 0805
220pF, 0603
6MV1000GX, 1000mF, 6.3V
1000pF, 0805
1mF, 0603
6MV1500GX, 1500mF, 6.3V
0.1mF, 0603
6MV2200GX, 2200mF, 6.3V
4.7mF, 0805
1mF, 0603
0.01mF, 0603
39pF, 0603
10V, 5%, 0603
Manuf
Fairchild
IR
Fairchild
IR
IR
IR
IR
Micro Metal
Micro Metal
Sanyo
Sanyo
Sanyo
Sanyo
Sanyo
2KV, 5%, 0603
1V, 5%, 0805
4.7V, 5%, 0805
3.3KV, 1%, 0603
0V, 0603
47KV, 5%, 0603
2.2KV, 1%, 0603
1V, 0603
100KV, 1%, 0603
10KV, 5%, 0603
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
www.irf.com
Rev. 1.5
07/17/02
IRU3027
(W) SOIC Package
28-Pin Surface Mount, Wide Body
H
A
B
C
R
E
DETAIL-A
PIN NO. 1
L
D
0.516 0.020 x 458
DETAIL-A
K
F
G
SYMBOL
A
B
C
D
E
F
G
I
J
K
L
R
T
I
T
J
28-PIN
MIN
MAX
17.73 17.93
1.27 BSC
0.66 REF
0.36
0.46
7.40
7.60
2.44
2.64
0.10
0.30
0.23
0.32
10.11 10.51
08
88
0.51
1.01
0.63
0.89
2.44
2.64
NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS.
Rev. 1.5
07/17/02
www.irf.com
9
IRU3027
PACKAGE SHIPMENT METHOD
PKG
DESIG
W
PACKAGE
DESCRIPTION
SOIC, Wide Body
1
PIN
COUNT
PARTS
PER TUBE
PARTS
PER REEL
T&R
Orientation
28
27
1000
Fig A
1
1
Feed Direction
Figure A
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
10
www.irf.com
Rev. 1.5
07/17/02