US3004 Просмотр технического описания (PDF) - Unisem
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US3004 Datasheet PDF : 14 Pages
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US3004,US3005
TYPICAL APPLICATION
Pentium with AGP
L1
Q1
5V
C5
R1
C13
C3
R2
R3
L2
R16 R17
C7
C16
Q2 R4
R12 R13
Vout 3
C10
3.3V
C4
12V
R18
12
V12
1 Ct
C1
13 SS
C2
D4
15
VID4
VID3
VID2
VID1
VID0
C6
5
8
9
7
V5 CS+ HDrv CS-
US3004
D3 D2 D1 D0
16 17 18 19
11
LDrv
PGd
6
10
Gnd
Vfb2
4
Q3
C9
14
Vfb3
R11
Lin1 2
C15
Vfb1 3
Lin2
20
Q4
R9
3.3V
C14
R5
Power Good
C8
C11
R7
R8
3.3V
C12
R14
3004app3-1.4
R15
Figure 3- Typical application of US3004 in a Pentium with AGP where the power dissipation of the 3.3V
linear regulator is equally distributed between Q3 and Q4 pass transistors. This equal distribution is
possible by accurately regulating the first regulator using the US3004 linear controller and its internal 1%
reference voltage while the second controller regulates the output of the first regulator from 4.17V to
3.3V, thereby distributing the power dissipation equally.
4-8
Rev. 1.2
12/8/00
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