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參數(shù)資料
| 型號： | US2075 |
| 廠商： | Unisem Group |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護 |
| 文件頁數(shù)： | 4/4頁 |
| 文件大?。?/td> | 42K |
| 代理商： | US2075 |
US2075
4-4
Rev. 1.2
4/26/98
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
U1
Description Qty
LDO/Switcher IC
Part #
US2075CT (TO220)
US2075CM (TO263) (note 1)
IRL3303 (TO220)
IRL3103S (TO263) (note 1)
MBR1045CT (TO220)
MBRB1545CT (TO263) (note1)
Core:T50-18,L=4 uH
Turns: 10T, 18 AWG
L=2 uH
22 ohm,5%, SMT 1206 size
10 ohm, 5%, SMT 1206 size
806 ohm,1%, SMT 0805 size
90.9 kohm,1%, SMT 0805 size
1.24 kohm,1%, SMT 0805 size
2.49 kohm,1%, SMT 0805 size
4.99 kohm,1%, SMT 0805 size
10 kohm,1%, SMT 0805 size
1.30 kohm,1%, SMT 0805 size
324 kohm,1%, SMT 0805 size
10pF,Ceramic, SMT 0805 size
1 uF,Ceramic, SMT 0805 size, Z5U
EEUFA1A681L, 680uF,10V, Elect
470pF,Ceramic, SMT 0805 size
6MV1500GX, 1500uF,6.3V, Elect
EEUFA1A681L, 680uF,10V, Elect
6MV1500GX, 1500uF,6.3V, Elect
For MOSFET , 577002
For Schottky Diode , 577002
For US2075 , 507222 (I/O Load Current<5A)
576602 (I/O Load Current< 3.5A)
Manufacturer
Unisem
1
Q2
MOSFET
1
International
Rectifier
Motorola
D2
Schottky Diode
1
L2
Inductor
1
Micro Metal
(core)
L1
R3
R5
R8C
R8B
R7A
R7B
R7C
R7D
R7E
R6A
C8
C1
C7
C3
C4
C5
C6
HS1
HS2
HS3
Inductor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Capacitor
Heat Sink
Heat Sink
Heat Sink
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
4
1
1
1
Panasonic
Sanyo
Panasonic
Sanyo
Aavid
Aavid
Aavid
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
3.5
3.4
3.3
3.2
3.1
3.0
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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