IRU3055CQ ,5 Bit Prog 3-Phase SynchBuck CICAPPLICATIONSIntel Pentium 4 and AMD K7TYPICAL APPLICATION12VC3D1C4C11uF L1 1000uF1uF1uHC20.1uFVCL ..
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IRU3055CQ
5 Bit Prog 3-Phase SynchBuck CIC
International
TOR Rectifier
FEATU RES
1.075V to 1.850V
Meets VRM 9.0 Specification
3-Phase Controller with On-Board MOSFET Driver
On-Board DAC programs the output voltage from
Data Sheet No. PD94262
IRU3055
5-BIT PROGRAMMABLE 3-PHASE
SYNCHRONOUS BUCK CONTROLLER IC
PRELIMINARY DATA SHEET TEST SPEC
DESCRIPTION
The IRU3055 is a 3-phase synchronous Buck controller
which provides high performance DC to DC converter for
high current applications.
Cl Loss-Iess Short Circuit Protection The IRU3055 controller IC is specifically designed to meet
ta Programmable Frequency Intel and AMD specifications for the new microproces-
D Synchronous operation allows maximum efficiency sor requiring low voltage and high current.
I: Minimum Part Count
I: Soft-Start The IRU3055 features under-voltage lockout for both 5V
D Power Good Function and 12V supplies, an external and programmable soft-
El Hiccup Mode Current Limit start function as well as programming the oscillator fre-
APPLI C ATI ON S quency by using an external resistor.
D Intel Pentium 4 and AMD K7
TYPICAL APPLICATION, - - t, Elev
-LCI . TCF-l DI l-se, L1 e 10:00uF
T l” I l 22 7 1uH T
T ', I 0.1uF
WET Vcc ij,': g VCL1 Lt'-) - +
> o VCL23 _ r-] -P-cis
2, > HDrv1 E- $37043 $6x1500uF
I R1 '- -
T OCSet NNN -
2.2K L_2
Ref - 7''7N'N'N
L- C12 luF4
LDrv1 IRF3711S R2
PGnd1/ ieq 1.5K
Rt OCGnd __L ll
CS1 . llluF 1.5V/6OA
[:03 Cl
ss HDrv2 I IRF3704S L3
--C9 gm C10 |RU3055 :1 _ T'WWW;
TIUF 47K 0.1uF D 2 c-U, lurH
D4 L rv |,_ IRF3711S R4
PGnd2 - 1.5K
- D3 = II C11
CS2 V ”1UF
- D2 Laos
- D1 HDrv3 |r_ IRF3704S L4
L- 06 1uH
Do LDN3 |",_ IRF3711S R5
IC12 R6 Comp PGnd3 1.5K
l22nF 27K _T_ ll C13
C7 CS3 _ II 1uF
100pF Fb '
(Optional) __C14
Figure 1 - Typical application of IRU3055. -
I 8x 2700uF
PACKAGE ORDER INFORMATION
Rev. 1.4
08/1 3102
Ta (°C)
DEVICE
PAC KAG E
0T0 70
IRU3055CQ
36-Pin Plastic QSOP WB (Q)
1
International
TOR Rectifier
ABSOLUTE MAXIMUM RATINGS
chz and Wm Supply Voltage ................................... 30V (not rated for inductor load)
VCL1 and VCL23 Supply Voltage ................................... 20V
Vcc Supply Voltage .................................................. 7V
Storage Temperature Range ...................................... -65°C To 150°C
Operating Junction Temperature Range ..................... 0°C To 125°C
PACKAGE INFORMATION
36-PIN WIDE BODY PLASTIC QSOP (Q)
Rt E V E] Vm
Comp E Es] LDrv1
Fb [E Es] PGnd1
ss E Es] OCGnd
CSI E El HDrv1
CS2 E Ell chz
cs3 E Ei HDrv2
Vcc E E NC
VSEI' [E E Gnd
D0 E Er] PGnd2
D1 E E] LDrv2
D2 E Es] van
D3 E: Z] LDrv3
D4 E Es] PGnd3
Fault E 2] HDrv3
OCSet E Ell Vol,
Gnd E El Ref
SD E E PGood
GJA =60°C/W
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over VCL1=VCL23=VCH12=VCH3=12V, Vcc=5V and Teo to
70°C. Typical values refer to TA=25°C. Low duty cycle pulse testing is used which keeps junction and case tem-
peratures equal to the ambient temperature.
PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS
Supply Current Section
Operating Supply Current Ch, High Side=3000pF
Cr, Low Side=6000pF
Icc V5 17 19 21
ICLH V12 (150KHz frequency) 30 50 70 mA
VID Section
DAC Output Voltage (Note 1) VDAC -1.5 Vs +1.5 %
DAC Output Line Regulation LREG 4.5 < Vcc < 5.5V -0.7 -0.06 +0.7 %
DAC Output Temp Variation TREG 0°C < temp < 70°C 1.4 2 %
VID Input LO 0.4 V
VID Input HI 2 V
VID Input Internal Pull-Up VIDR 12.4 16.4 20.4 kit
Resistor to 3.3V
2 Rev. 1.4
08/13/02
