US3033 查看數據表（PDF） - Unisem
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US3033 Datasheet PDF : 9 Pages
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US3033
TYPICAL APPLICATION
5V to 3.3V for Pentium Application with AGP or Pentium II Application without ATX power supply
Switching mode Operation.
12V
R9
C8
L1
5V
C1
8765
V12 Drv2 Vfb2 Gnd
U1
Drv1V12swVfb1 Vhyst
1234
C3
R1
R3
C5
Q2
C2
C4
R2 D1
L2
R4
R5
3033app4-1.2
Vout
C7
Figure4- The circuit in figure 4 is the application of the US3033 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.
Ref Desig Description
U1
LDO/Switcher IC
Q2
MOSFET
D1
Schottky Diode
L2
Inductor
L1
R1
R9
R2
R3
R4
R5
C1,2
C3
C4
C5
C7
C8
HS1
HS2
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
Qty
Part #
1 US3033CS ( 8 pin SOIC)
1 IRL3303 (TO220)
IRL3103S (TO263) (note 1)
1 MBR1045CT (TO220)
MBRB1545CT (TO263) (note1)
1 Core:T50-18,L=4 uH
Turns: 10T, 18 AWG
1 L=2 uH
1 22 ohm,5%, SMT 1206 size
1 10 ohm,5%, SMT 0805 size
1 10 ohm, 5%, SMT 1206 size
1 249 kohm,1%, SMT 0805 size
1 1 kohm,1%, SMT 0805 size
1 576 ohm,1%, SMT 0805 size
2 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 470 pF,Ceramic, SMT 0805 size
1 10 pF,Ceramic, SMT 0805 size
1 6MV1500GX, 1500uF,6.3V, Elect
1 1 uF,Ceramic, SMT 0805 size
1 For MOSFET , 577002
1 For Schottky Diode , 577002
Manufacturer
Unisem
International
Rectifier
Motorola
Micro Metal
(core)
Sanyo
Sanyo
Sanyo
Sanyo
Aavid
Aavid
Note 1: For the applications where it is desirable to eliminate the heat sink, the IRL3103S for Q2 and MBR1545CT for D2 in TO263
packages with minimum of 1" square copper pad can be used.
Rev. 1.5
1/14/99
4-7
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