iru3034 International Rectifier Corp., iru3034 Datasheet - Page 6

• Manufacturer Part Number: iru3034
• Description: 8-pin Pwm Switcher Controller Ic With Current Limiting -
• Manufacturer: International Rectifier Corp.

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)
Figure 4 - The circuit in figure 4 is the application of the IRU3034 which is done using a dual layout with IRU3033 in
a switching mode only. This circuit can be used to generate a low cost 5V to 3.3V for either Pentium application
with AGP socket or in Pentium II applications where it is desirable to generate an accurate on-board 3.3V supply.
Note: For the applications where it is desirable to eliminate the heat sink, the IRL3103S for Q2 and MBR1545CT
for D2 in TO-263 packages with minimum of 1" square copper pad can be used.
6
12V
Ref Desig
U1
Q2
D1
L2
L1
R1
R9
R2
R3
R4
R5
R6
R7
R8
C1, 2
C3
C4
C5
C6
C7
C8
HS1
HS2
5V
R9
Description
LDO/Switcher IC
MOSFET
Schottky Diode
Inductor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
C1
L1
C8
C3
C2
R1
V
SS/
V
12
Drv
Q2
12
Qty
1
1
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
V
CS-/
V
U1
FB2
FB
IRU3034CS (8-Pin SOIC)
IRL3303 (TO-220)
IRL3103S (TO-263) (Note 1)
MBR1045CT (TO-220)
MBRB1545CT (TO-263) (Note1)
Core: T50-18, L=4 H
Turns: 10T, 18 AWG
L=2 H
22 , 5%, SMT 1206 size
Open for IRU3034, 10
10 , 5%, SMT 1206 size
249K , 1%, SMT 0805 size
1K , 1%, SMT 0805 size
576 , 1%, SMT 0805 size
5m , 5%, 2W
4.99K , 1%, SMT 0805 size
4.7K , 5% for IRU3034, Open for IRU3033
6MV1500GX, 1500 F, 6.3V, Elect
1 F, Ceramic, SMT 0805 size
470pF, Ceramic, SMT 0805 size
10pF, Ceramic, SMT 0805 size
4700pF for IRU3034, Open for IRU3033
6MV1500GX, 1500 F, 6.3V, Elect
0.047 F for IRU3034 , 0.1 F for 3033
For MOSFET, 577002
For Schottky Diode, 577002
V
CS+/
Drv2
HYST
C4
Gnd
R2
R3
www.irf.com
D1
C5
Part #
for IRU3033
L2
R4
R5
R8
C6
R6
Micro Metal
Motorola
Manuf
(core)
Sanyo
Sanyo
Sanyo
Sanyo
R7
Aavid
Aavid
IR
IR
C7
V
OUT