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IRU3021M
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK PLUS TRIPLE LDO CONTROLLER
International
1:211 fky:ctifia-
Data Sheet No. PD94145
IRU3021 M
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
PLUS TRIPLE LDO CONTROLLER
FEATU RES
Provides single chip solution for Vcore, GTL+,
AGP bus, and 1.8V
I: Automatic voltage selection for AGP slot Vooo
supply
I: Linear Regulator Controller On-Board for 1 .8V
I: Designed to meet Intel latest VRM specification
for next generation microprocessors
" On-Board DAC programs the output voltage from
1.3V to 3.5V
I: Linear Regulator Controller On-Boardfor 1.5V
GTL+ Supply
" Loss-less Short Circuit Protection for all Outputs
u Synchronous operation allows maximum em-
ciency
" Patented architecture allows fixed frequency
operation as well as 100% duty cycle during
dynamic load
a Minimum Part Count
I: Soft-Start
I: High current totem pole driverfor direct driving of
the external Power MOSFET
II Power Good function monitors all outputs
a Over-Voltage Protection Circuitry Protects the
switcher output and generates a Fault output
APPLICATIONS
II Total Power Solution for next generation Intel
processor application
DESCRIPTION
The IRU3021 M controller IC is specifically designed to
meet Intel specification for next generation microproces-
sor applications requiring multiple on-board regulators.
The |RU3021M 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 VDDo supply, one for GTL+ and
the other for the 1.8V chip set regulator as required for
the next generation PC applications. The IRU3021 M uses
N-channel MOSFET as pass transistor for Vout2(VDDo),
Vout3(1.5V) and Vout4(1.8V). No external resistor di-
vider is necessary for any ofthe regulators. The switch-
ing regulator feature a patented topology that in combi-
nation 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 IRU3021 M also features, loss-
less 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 cir-
cuit condition for the linear outputs and latches the sys-
tem 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.
I YPICAL APPLICATION
3BV + LINEAR I CIC]
I CONTROL SWITCHER -
CIC] , CONTROL 1/othl
Vout2 _- + IRU3021M l +
Ill] T I
LINEAR LINEAR
El CONTROL CONTROL l
Vout3 B 1,s-,a,xss,,-,r-s, Vout4
3021mm”
li] Figure 1 - Typical application ofthe |RU3021M.
PACKAGE ORDER INFORMATION
TA (°C) DEVICE
PACKAGE
0 To 70 |RU3021MCW
28-Pin Plastic SOIC WB
Rev. 1.4
07/24/01
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 E V gm 2
Fix E Er] UGate
VID4 [E E Phase
VIDSE E LGate
VID2 E E PGnd
VID1 [E @ocsm
VIDOE @Vsem
PGoodE E Fb
SDE Eius
Vsen2 E EVsen3
Select [E E Drive3
ss E Crlisnd
Fault / Ras Ei NC
Vsen4 E E Drive4
6JA =80°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise spetyTed, these speefcations apply overV12=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-5V 0.3 V
Supply Current
Operating Supply Current V12 6 mA
Switching Controllers; Vcore (Vsen 1) and AGP (Vsen 2)
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 Pull-Up
Resistor to V5 27 Kn
Vsen2 Voltage Select<0.8V 1.5 V
Select>2V 3.3 V
2 Rev. 1.4
07/24/01
