IRU3055 Datasheet PDF - International Rectifier
| Part Number | IRU3055 | |
| Description | 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC | |
| Manufacturers | International Rectifier | |
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There is a preview and IRU3055 download ( pdf file ) link at the bottom of this page. Total 26 Pages | ||
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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
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IRU3055
PIN#
15
16
17
28
18
19
20
21
31
22
30
32
23
27
34
24
26
35
25
36
29
33
PIN SYMBOL
Fault
OCSet
Gnd
SD
PGood
Ref
VCH3
VCH12
HDrv3
HDrv2
HDrv1
PGnd3
PGnd2
PGnd1
LDrv3
LDrv2
LDrv1
VCL23
VCL1
NC
OCGnd
PIN DESCRIPTION
Fault detector. When the output exceeds the OVP trip point, the fault pin switches to
2.8V and pulls down the soft-start.
This pin is connected to the drain of the synchronous MOSFET in channel 1 of the Core
supply and it provides the positive sensing for the internal current sensing circuitry. An
external resistor programs the over current threshold depending on the RDS(ON) of the
power MOSFET.
Analog ground for internal reference and control circuitry. Connect to PGnd with a short
trace.
Shut down pin. Pulling-up this pin disables the outputs.
Power good pin. This pin is a collector output that switches Low when the output of the
converter is not within 610%(typ) of the nominal output voltage.
2V reference output.
These pins power the high side MOSFET driver. A minmum 1mF ceramic cap must be
connected from these pins to ground to provide peak drive current capability.
Output drivers for the high side power MOSFET.
These pins serve as the ground pins and must be connected directly to the ground plane.
A high frequency capacitor (0.1 to 1mF) must be connected from pins VCL1, VCL23 and
VCH3, VCH12 to PGnd1, 2 and 3 for noise free operation.
Output driver for the synchronous power MOSFET.
These pins are connected to the 12V supply and serves as the power Vcc pin for the low
side output drivers. A high frequency capacitor (0.1 to 1mF) must be connected directly
from these pins to PGnd1, PGnd2 and PGnd3 pins in order to supply the peak current to
the power MOSFET during the transitions.
No connection.
This pin is connected from the source of the synchronous MOSFET in channal 1 of the
Core supply and it provides the reference point for the internal current sensing circuitry.
Rev. 1.4
08/13/02
www.irf.com
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for IRU3055 electronic component. |
| Information | Total 26 Pages | |
| Link URL | [ Copy URL to Clipboard ] | |
| Download | [ IRU3055.PDF Datasheet ] | |
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| Part Number | Description | MFRS |
| IRU3055 | The function is 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC. International Rectifier | |
| IRU3055 | The function is 5-BIT PROGRAMMABLE 3-PHASE SYNCHRONOUS BUCK CONTROLLER IC. International Rectifier | |
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