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US2075 Datasheet(PDF) 4 Page - UNISEM

Part No. US2075
Description  PWM SWITCHER CONTROLLER & 7.5A LOW DROPOUT REGULATOR COMBO
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Maker  UNISEM [UNISEM]
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US2075 Datasheet(HTML) 4 Page - UNISEM

   
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US2075
4-4
Rev. 1.2
4/26/98
TYPICAL APPLICATION
TYPICAL APPLICATION
Note 1: For the applications where it is desirable to eliminate the heat sink, the US2075CM for U1 when load current is
less than 1.5A, the IRL3103S for Q2 and MBR1545CT for D1 in TO263 packages with minimum of 1" square copper pad
can be used.
Core Supply
Cache & Chip Set
U1
JP3
Drv
V12
Vfb
Gnd
Vhyst
Vo
V5
1
2
3
4
5
6
7
JP2
JP4
JP5
2050ta3d
12V
5V
JP7
CPU I / O
1
2
3
C7
L1
R3
Q2
D2
C1
R5
C3
C4
R7A
R7B
R7C
R7D
R7E
C6
L2
C5
R6A
C8
R8B
R8C
Ref Desig
Description
Qty
Part #
Manufacturer
U1
LDO/Switcher IC
1
US2075CT (TO220)
Unisem
US2075CM (TO263) (note 1)
Q2
MOSFET
1
IRL3303 (TO220)
International
IRL3103S (TO263)
(note 1)
Rectifier
D2
Schottky Diode
1
MBR1045CT (TO220)
Motorola
MBRB1545CT (TO263) (note1)
L2
Inductor
1
Core:T50-18,L=4 uH
Micro Metal
Turns: 10T, 18 AWG
(core)
L1
Inductor
1
L=2 uH
R3
Resistor
1
22 ohm,5%, SMT 1206 size
R5
Resistor
1
10 ohm, 5%, SMT 1206 size
R8C
Resistor
1
806 ohm,1%, SMT 0805 size
R8B
Resistor
1
90.9 kohm,1%, SMT 0805 size
R7A
Resistor
1
1.24 kohm,1%, SMT 0805 size
R7B
Resistor
1
2.49 kohm,1%, SMT 0805 size
R7C
Resistor
1
4.99 kohm,1%, SMT 0805 size
R7D
Resistor
1
10 kohm,1%, SMT 0805 size
R7E
Resistor
1
1.30 kohm,1%, SMT 0805 size
R6A
Resistor
1
324 kohm,1%, SMT 0805 size
C8
Resistor
1
10pF,Ceramic, SMT 0805 size
C1
Capacitor
1
1 uF,Ceramic, SMT 0805 size, Z5U
C7
Capacitor
1
EEUFA1A681L, 680uF,10V, Elect
Panasonic
C3
Capacitor
1
470pF,Ceramic, SMT 0805 size
C4
Capacitor
1
6MV1500GX, 1500uF,6.3V, Elect
Sanyo
C5
Capacitor
1
EEUFA1A681L, 680uF,10V, Elect
Panasonic
C6
Capacitor
4
6MV1500GX, 1500uF,6.3V, Elect
Sanyo
HS1
Heat Sink
1
For MOSFET , 577002
Aavid
HS2
Heat Sink
1
For Schottky Diode , 577002
Aavid
HS3
Heat Sink
1
For US2075 , 507222 (I/O Load Current<5A)
Aavid
576602 (I/O Load Current< 3.5A)
Figure2- Typical application of US2075 in a
flexible motherboard with the 4 bit VID output voltage selection.
This circuit uses a single jumper that programs the output volt-
age in 16 steps with 0.1V steps from 2V to 3.5V, designed for
Intel P55
™,P54™, AMD K5 & K6™ as well as Cyrix M1™ and
M2
™ applications. The jumper JP7 selects between single sup-
ply and dual supply processors.
JP2
JP3
JP4
JP5
Output
Voltage
0
0
0
0
3.5
0
0
0
1
3.4
0
0
1
0
3.3
0
0
1
1
3.2
0
1
0
0
3.1
0
1
0
1
3.0
0
1
1
0
2.9
0
1
1
1
2.8
1
0
0
0
2.7
1
0
0
1
2.6
1
0
1
0
2.5
1
0
1
1
2.4
1
1
0
0
2.3
1
1
0
1
2.2
1
1
1
0
2.1
1
1
1
1
2.0


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