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IRU3013
VRM 8.5 COMPATIBLE 5-BIT PROGRAMMABLE SYNCHRONOUS BUCK CONTROLLER IC WITH TRIPLE LDO CONTROLLER
Inter nrati on ol Data Sheet No. PD94249
Tcat Rectifier IRU3013
VRM 8.5 COMPATIBLE
5-BIT PROGRAMMABLE SYNCHRONOUS BUCK
CONTROLLER IC WITH TRIPLE LDO CONTROLLER
FEATU RES DESCRIPTION
" Meets Latest VRM 8.5 Specification The IRU3013 controller IC is specifically designed for
" Provides Single Chip Solution forVcore, 1.2VAGTL+, Intel Pentium lllTM microprocessor applications as de-
1.8V and Vooo scribed in the VRM 8.5 specification. The IC provides
" On-Board 5-Bit DAC and Decoder programs the out- a single chip solution for the Vcore, 1.2V AGTL+,
putvoltage from 1.050V to 1.825V 1.8V and a third uncommitted LDO controller that
" Loss-less Short Circuit Protection can be used either as 1.2V power good detector or
I: Synchronous operation allows maximum efficiency to provide 1.5V AGP bus in applications that this
I: Patented architecture allows fixed frequency opera- voltage is required. The IRU3013 features a patented
tion as well as 100% duty cycle when operating with topology that, in combination with a few external com-
a changing load ponents, (*Note: See application current in figure 3) will
" Minimum Part Count, No External Compensation provide in excess of 30A of output current for an on-
Il Soft-Start board Vcore synchronous converter while automatically
I: High current totem pole driver for directly driving an providing the output voltage specified in VRM 8.5 speci-
external Power MOSFET fication. The IRU3013 also features, loss-less current
ll Power Good Function sensing by using the RDS(0N) of the high side Power
MOSFET as the sensing resistor, a Power Good win-
APPLICATIONS dow comparator that switches its open collector output
a Pentium III with VRM 8. 5 Specification low when the output is outside of a i10% window. Other
a DC to DC Converters features ofthe device are: Under-voltage lockout for both
5V and 12V supplies, an external programmable soft-
start function, and the ability to program the oscillator
frequency by connecting an external capacitor.
TYPICAL APPLICATION VRM 8.5 VID 5V
Cl L, LINEAR
_- l CONTROL SWITCHER
VOUTZ %fi CONTROL
fl] IRU3013
I LINEAR LINEAR
vouT3-f CONTROL CONTROL
Figure 1 - Typical application of IRU3013.
Note: Pentium III is trade mark of Intel Corp.
PACKAGE ORDER INFORMATION
Ta (°C) DEVICE PACKAGE
0 To 70 IRU3013CW 24-Pin Plastic SOIC WB
0 To 70 IRU3013CQ 24-Pin Plastic QSOP
Rev. 1.2 1
09/06/01
IRU3013
ABSOLUTE MAXIMUM RATINGS
V5 Supply Voltage _................................................... 10V
V12 Supply Voltage _................................................. 20V
All Other Pins .......................................................... 7V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
PACKAGE INFORMATION
24-PIN WIDE BODY PLASTIC SOIC (W) 24-PIN PLASTIC QSOP (Q)
TOPVIEW TOPVIEW
01E . V E Lin2 Ct E . V E Lin2
Lin1 E Em Lin1|Z Em
VFB1E E] D1 VFE1 E E DI
VFBZE Ell D2 vsz a D2
VSE 20 D3 st Ei D3
OWE E D25 OWE E D25
PGd E ti st3 P00 E E VFES
cs/E El SS cs/E Ch ss
cs/E Es] Lin4 cs/E E Lin4
HDNE Es] VFB4 HDrv M E vm
Poll E v12 PGndE E] v12
Gnd[1:2 E LDrv snag Es] LDN
0JA=80°CNV 0JA=88°CNV
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications 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
VID Section
DAC Output Voltage (Note 1) 0.98Vs Vs 1.02Vs V
DAC Output Line Regulation 4.5
10.5DAC Output Temp Variation 0.5 %
VID Input LO 0.4 V
VID Input HI 2 V
VID Input Internal PuII-up
Resistor to 5V 27 kit
Power Good Section
Under-Voltage Lower Trip Point Vom Ramping Down 0.90Vs V
Under-Voltage UpperTrip Point Vow Ramping Up 0.92Vs V
UV Hysteresis 0.02Vs V
Over-Voltage Upper Trip Point Vow Ramping Up 1.10Vs V
Over-Voltage Lower Trip Point Vow Ramping Down 1.08Vs V
OV Hysterises 0.02Vs V
Power Good Output LO RL= 3mA 0.3 V
PowerGood Output HI RL-- 5K Pull-Up to 5V 4.95 V
Soft-Start Section
Soft-Start Current CS+ = 0V, CS- = 5V 10 WA
2 Rev. 1.2
09/06/01
