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IRU3027CW-IRU3027CWTR
5 Bit Prog SynchBuck CIC with 3 LDO Controllers in a 28-Pin SOIC(WB) package
International
TOR Rectifier
Data Sheet No. PD94146
IRU3027
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC
FEATU RES
Designed to meet VRM 9.0 specification for next
generation microprocessors
El 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
D 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 eth-
ciency
Patented architecture allows ioted 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
D Total power solution for next generation Intel
processor application
D AMD K7 Low Cost Solution
WITH TRIPLE LDO CONTROLLER
DESCRIPTION
The IRU3027 controller IC is specifically designed to meet
VRM 9.0 specification for next generation microproces-
sor applications requiring multiple on-board regulators.
The IRU3027 provides a single chip controller IC for the
Vcore, three LDO controllers, one with an automatic se-
lect pin that connects to the Type Detect pin of the AGP
slot for the AGP Vooo 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
Vom4(1.8V). No external resistor divider is necessary
for any of the regulators. The switching regulator fea-
tures a patented topology that in combination with a few
external components as shown in the typical applica-
tion circuit, will provide well in excess of 20A of output
current for an on-board DC-DC converter while automati-
cally providing the right output voltage via the 5-bit inter-
nal DAC. The IRU3027 also features loss-less current
sensing for both switchers by using the Rosz) 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 out-
puts is outside of a pre-programmed window.
TYPICAL APPLICATION
3.3V L- Cl
I t LINEAR I“ --
T I COVTRCX. SVVITCHER j
- l CONTROL ' VOUT1
VOUT2 €441 IRU3027 t:
T -=- -=-
= LINEAR LINEAR Fl
= CONTROL CONTROL '-1
VOUT3 E; ' VOUT4
Cj. Figure 1 - Typical application of IRU3027. CJ]
PACKAGE ORDER INFORMATION
TA (°C) DEVICE PACKAGE
0 To 70 IRU3027CW 28-Pin Plastic SOIC WB
Rev. 1.5 1
07l17/02
International
TOR Rectifier
IRU 3027
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage _................................................... 7V
V12 Supply Voltage _................................................. 20V
Storage Temperature Range ...................................... -65 To 150°C
Operating Junction Temperature Range ..................... 0 To 125°C
PACKAGE INFORMATION
28 PIN WIDE BODY PLASTIC SOIC (W)
TOP VIEW
Drive2E V sz
FixE Elusate
VID4E EPhase
vmaE ELGate
vnozE aPGnd
VID1E Eocsm
VIDOE Evan“
PGood E EH;
SD IE EVE:
vsmz E Evsaxe
Select E EDriveS
SSE Elena
Fault / RtEa ENC
VSEN4 E EDrive4
OJA =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 SYM TEST CONDITION MIN TYP MAX UNITS
Supply UVLO Section
UVLO Threshold-12V Supply Ramping Up 10 V
UVLO Hysteresis-12V 0.6 V
UVLO Threshold-W Supply Ramping Up 4.4 V
UVLO Hysteresis-W 0.3 V
Supply Current
Operating Supply Current V12 6 mA
Switching Controllers; Vcore (Vsen1) and AGP (Vsm2)
VID Section (Vcore only)
DAC Output Voltage (Note 1) 0.99Vs Vs 1.01Vs V
DAC Output Line Regulation 0.1 %
DAC Output Temp Variation 0.5 %
VID Input LO 0.8 V
VID Input HI 2 V
VID Input Internal PuII-Up 27 Kn
Resistor to V5
VSEN2 Voltage Select <0.8V 1.5 V
Select >2V 3.3
2 Rev. 1.5
07I17I02
