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International Rectifier Electronic Components Datasheet

IRU3055 Datasheet

5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC

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Data Sheet No. PD94262
IRU3055
5-BIT PROGRAMMABLE 3-PHASE
SYNCHRONOUS BUCK CONTROLLER IC
PRELIMINARY DATA SHEET TEST SPEC
FEATURES
DESCRIPTION
Meets VRM 9.0 Specification
3-Phase Controller with On-Board MOSFET Driver
On-Board DAC programs the output voltage from
1.075V to 1.850V
Loss-less Short Circuit Protection
Programmable Frequency
Synchronous operation allows maximum efficiency
Minimum Part Count
Soft-Start
Power Good Function
Hiccup Mode Current Limit
APPLICATIONS
The IRU3055 is a 3-phase synchronous Buck controller
which provides high performance DC to DC converter for
high current applications.
The IRU3055 controller IC is specifically designed to meet
Intel and AMD specifications for the new microproces-
sor requiring low voltage and high current.
The IRU3055 features under-voltage lockout for both 5V
and 12V supplies, an external and programmable soft-
start function as well as programming the oscillator fre-
quency by using an external resistor.
Intel Pentium 4 and AMD K7
TYPICAL APPLICATION
C1
1uF
5V Vcc
C5
1uF
Ref
Rt
V CL1
V CL23
HDrv1
OCSet
LDrv1
PGnd1/
OCGnd
CS1
C9 R3
1uF 47K
SS
C10
0.1uF
D4
D3
D2
D1
HDrv2
IRU3055
LDrv2
PGnd2
CS2
HDrv3
C12 R6
22nF 27K
C7
100pF
(Optional)
D0
Comp
LDrv3
PGnd3
CS3
Fb
R1
2.2K
D1
C2
0.1uF
C3
1uF
L1
1uH
C4
1000uF
Q1
IRF3704S
Q2
IRF3711S
Q3
IRF3704S
Q4
IRF3711S
Q5
IRF3704S
Q6
IRF3711S
C6
6x 1500uF
L2
R2
1.5K
1uH
C8
1uF
L3
R4
1.5K
1uH
C11
1uF
L4
R5
1.5K
1uH
C13
1uF
Figure 1 - Typical application of IRU3055.
12V
1.5V / 60A
C14
8x 2700uF
PACKAGE ORDER INFORMATION
TA (8C)
0 To 70
DEVICE
IRU3055CQ
PACKAGE
36-Pin Plastic QSOP WB (Q)
Rev. 1.4
08/13/02
www.irf.com
1


International Rectifier Electronic Components Datasheet

IRU3055 Datasheet

5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC

No Preview Available !

IRU3055
ABSOLUTE MAXIMUM RATINGS
VCH12 and VCH3 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 1
Comp 2
Fb 3
SS 4
CS1 5
CS2 6
CS3 7
Vcc 8
VSET 9
D0 10
D1 11
D2 12
D3 13
D4 14
Fault 15
OCSet 16
Gnd 17
SD 18
uJA =608C/W
36 VCL1
35 LDrv1
34 PGnd1
33 OCGnd
32 HDrv1
31 VCH12
30 HDrv2
29 NC
28 Gnd
27 PGnd2
26 LDrv2
25 VCL23
24 LDrv3
23 PGnd3
22 HDrv3
21 VCH3
20 Ref
19 PGood
ELECTRICAL SPECIFICATIONS
Unless otherwise specified, these specifications apply over VCL1=VCL23=VCH12=VCH3=12V, Vcc=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 tem-
peratures equal to the ambient temperature.
PARAMETER
Supply Current Section
Operating Supply Current
VID Section
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 3.3V
SYM
TEST CONDITION
MIN
CL High Side=3000pF
CL Low Side=6000pF
ICC V5
ICLH V12 (150KHz frequency)
17
30
VDAC
LREG
TREG
4.5 < Vcc < 5.5V
08C < temp < 708C
-1.5
-0.7
VIDR
2
12.4
TYP
19
50
Vs
-0.06
1.4
16.4
MAX
21
70
+1.5
+0.7
2
0.4
20.4
UNITS
mA
%
%
%
V
V
KV
2 www.irf.com
Rev. 1.4
08/13/02


Part Number IRU3055
Description 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC
Maker International Rectifier
Total Page 26 Pages
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