iru3033 International Rectifier Corp., iru3033 Datasheet - Page 8

• Manufacturer Part Number: iru3033
• Description: 8-pin Pwm Switcher And Linear Controller Ic
• Manufacturer: International Rectifier Corp.

IRU3033
TYPICAL APPLICATION
5V to 3.3V for Pentium application with AGP or Pentium II application
without ATX power supply switching mode operation.
Figure 5 - The circuit in figure 4 is the application of the 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 1: 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.
8
12V
5V
Ref Desig
U1
Q2
D1
L2
L1
R1
R9
R2
R3
R4
R5
C1, 2
C3
C4
C5
C7
C8
HS1
HS2
R9
C1
L1
Description
LDO/Switcher IC
MOSFET
Schottky Diode
Inductor
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
C8
R1
C2
Q2
V
Drv1
V
12(SW)
12
Qty
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
1
1
1
C3
Drv2
V
U1
FB1
IRU3033CS (8-Pin SOIC)
IRL3303 (TO-220)
IRL3103S (TO-263) (Note 1)
MBR1045CT (TO-220)
MBRB1545CT (TO-263) (Note 1)
Core: T50-18, L=4mH
Turns: 10T, 18 AWG
L=2mH
22V, 5%, SMT 1206 size
10V, 5%, SMT 0805 size
10V, 5%, SMT 1206 size
249KV, 1%, SMT 0805 size
1KV, 1%, SMT 0805 size
576V, 1%, SMT 0805 size
6MV1500GX, 1500mF, 6.3V, Elect
1mF, Ceramic, SMT 0805 size
470pF, Ceramic, SMT 0805 size
10pF, Ceramic, SMT 0805 size
6MV1500GX, 1500mF, 6.3V, Elect
1mF, Ceramic, SMT 0805 size
For MOSFET, 577002
For Schottky Diode, 577002
V
V
Gnd
HYST
C4
FB2
R2
R3
www.irf.com
D1
C5
Part #
L2
R5
R4
Micro Metal
Motorola
(core)
Sanyo
Sanyo
Sanyo
Sanyo
Aavid
Aavid
Manuf
C7
IR
IR
V
OUT
07/17/02
Rev. 1.7