IRU3034CSTR International Rectifier, IRU3034CSTR Datasheet

IC CNTRL PWM SYNC SWITCH 8-SOIC

IRU3034CSTR

Manufacturer Part Number
IRU3034CSTR
Description
IC CNTRL PWM SYNC SWITCH 8-SOIC
Manufacturer
International Rectifier
Datasheet

Specifications of IRU3034CSTR

Applications
Controller, Intel Pentium®, II, P55C
Voltage - Input
12V
Number Of Outputs
1
Voltage - Output
2 ~ 3.5 V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
8-SOIC (3.9mm Width)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
IRU3034CSTR
Manufacturer:
IR
Quantity:
20 000
FEATURES
APPLICATIONS
TYPICAL APPLICATION
Notes: P55C, Pentium II are trademarks of Intel Corp. K5 & K6 are trademarks of AMD corp. Cyrix 6X86L, M1, M2 are trademarks of Cyrix
Corp. Power PC is trademark of IBM Corp.
PACKAGE ORDER INFORMATION
T
0 To 70
A
8-Pin SOIC switching controller with
HICCUP current limiting reduces diode power
dissipation to less than 1% of normal operation
Soft-Start capacitor allows for smooth output
voltage ramp up
On-Board MOSFET Driver
Fastest transient response of any controller
method. (0 to 100% Duty Cycle in 100ns)
1% Internal Voltage Reference
Internal Under-Voltage Lockout protects MOSFET
during start-up
Dual supply low voltage processor applications,
such as: P55C , CYRIX M2 , POWER PC
and AMD K6
Simple 5V to 3.3V switcher for Pentium with AGP
or Pentium II applications
(°C)
12V
5V
Basic Device Leadfree Device
IRU3034CS
C1
L1
C8
R1
C2
IRU3034CS(PbF)
Q2
Drv
SS
V
Figure 1 - Typical application of IRU3034.
12
IRU3034
C3
CS+
V
8-PIN PWM SWITCHER CONTROLLER IC
FB
V
CS-
HYST
C4
R2
Gnd
8-Pin Plastic SOIC(S)
R3
www.irf.com
Package
DESCRIPTION
The IRU3034 IC provides a low cost switching controller
with true short circuit protection all in a compact 8-pin
surface mount package, providing a low cost switching
solution for dual supply processor applications that re-
quire switching regulator for the 3.3V supply such as
the applications with AGP on-board. Typically in these
applications, a dual supply regulator converts 5V to 3.3V
for I/O supply and a jumper programmable supply of
1.25V to 3.5V for Core supply. The IC uses an internal
regulator generated from the 12V supply to power the
controller as well as the 12V supply to drive the power
MOSFET, allowing a low cost N-channel MOSFET to be
used. The IC also includes an error comparator for fast
transient response, a precise voltage reference for set-
ting the output voltage as well as a direct drive of the
MOSFET for the minimum part count.
D1
C5
WITH CURRENT LIMITING
Parts per
Tube
L2
95
Data Sheet No. PD94148 revA
R4
R5
IRU3034 & (PbF)
Parts per
R8
Reel
2500
C6
R6
R7
Orientation
C7
Fig. A
T & R
see
V
OUT
1

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IRU3034CSTR Summary of contents

Page 1

FEATURES 8-Pin SOIC switching controller with HICCUP current limiting reduces diode power dissipation to less than 1% of normal operation Soft-Start capacitor allows for smooth output voltage ramp up On-Board MOSFET Driver Fastest transient response of any controller method. (0 ...

Page 2

IRU3034 & (PbF) ABSOLUTE MAXIMUM RATINGS V Supply Voltages .................................................. 20V 12 Fb Pin Voltages ......................................................... -0. Storage Temperature Range ....................................... -65 To 150°C Operating Junction Temperature ................................. 0 To 150°C PACKAGE INFORMATION 8-PIN PLASTIC SOIC (S) TOP ...

Page 3

PIN DESCRIPTIONS PIN # PIN SYMBOL PIN DESCRIPTION 1 Drv The PWM output of the switching controller. This pin is a totem pole drive that is con- nected to the gate of the power MOSFET. A resistor may be placed ...

Page 4

IRU3034 & (PbF) TYPICAL APPLICATION Pentium Core Supply Application (IRU3034 and IRU3033 Dual Layout) Low Cost 4-Bit VID R9 12V SS Drv C3 Note: R9 can be eliminated if dual R1 layout with IRU3033 is ...

Page 5

PENTIUM CORE SUPPLY APPLICATION PARTS LIST (IRU3034 and IRU3033 Dual Layout) Low Cost 4-Bit VID Ref Desig Description U1 LDO/Switcher IC Q2 MOSFET D1 Schottky Diode L2 Inductor L1 Inductor R1 Resistor R2 Resistor R3 Resistor R4A * Resistor R4B ...

Page 6

IRU3034 & (PbF) TYPICAL APPLICATION 5V to 3.3V for Pentium Application with AGP or Pentium II Application without ATX power supply Switching mode Operation. (IRU3034 and IRU3033 Dual Layout) R9 12V SS Drv R1 ...

Page 7

TYPICAL APPLICATION 5V to 3.3V with loss-less short circuit protection (Output UVLO detection 12V Drv Figure 5 - The circuit in figure 5 is designed to provide loss-less output ...

Page 8

IRU3034 & (PbF) APPLICATION INFORMATION Introduction The IRU3034 device is an application specific product designed to provide an on-board switching supply for the new generation of microprocessors requiring separate Core and I/O supplies where the load current demand from the ...

Page 9

The peak power dissipated in the CS resistor is: Ppk = I × ×0.005 = However, the average power dissipated is much lower than 2W due to the long off time caused by the ...

Page 10

IRU3034 & (PbF) TYPICAL PERFORMANCE CHARACTERISTICS IRU3034 Output Voltage 1.28 Max 1.27 1.26 1.25 1.24 1.23 Min 1.22 -40°C -25°C 0°C +25°C +50°C +75°C Spec Max. Spec Min. Vout 7V Figure 6 - Output Voltage. IRU3034 Supply Current 14.00 12.00 ...

Page 11

SOIC Package 8-Pin Surface Mount, Narrow Body PIN NO. 1 0.38 ± 0.015 SYMBOL NOTE: ALL MEASUREMENTS ARE IN MILLIMETERS. IRU3034 & ...

Page 12

IRU3034 & (PbF) IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245, USA Tel: (310) 252-7105 Feed Direction Figure A Visit us at www.irf.com for sales contact information Data and specifications subject to change without ...

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