RT9174 查看數據表（PDF） - Richtek Technology
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RT9174 Datasheet PDF : 7 Pages
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RT9174
Typical Application Circuit
Preliminary
12V
C1
1uF
3.3V
Q1
PHD45N03LT
VDDQ
1.5 / 3.3V
R1
1K
C2
1000uF
R1
1K
R1
5K
C6
10nF
3.3V
5V
C1
1uF
1 VDD
2 DRI1
3 FB1
4 GND
DRI3 8
7
FB3
6
DRI2
FB2 5
RT9174
D1
1N4148
R8
1K
#TYPEDET
Q2
2SD1802
VO2
R4
1.8V
250
C3
R5 470uF
200
Q3
2SD1802
R6
424
C3
R7 470uF
200
3.3V
VO3
2.5V
VDDQ = 3.3V if FB1>1.3V
#TYPEDET = 0V to VDDQ = 1.5V
#TYPEDET = Open to VDDQ = 3.3V
Figure 1. Triple LDOs with VDDQ for M/B Application
12V
C1
1uF
R1
3.3V
5K
Q1
PHD45N03LT
VDDQ
1.5 / 3.3V
R2
4.3K
C6
10nF
C2
1000uF
R3
3.3V
4.99K
5V
C1
1uF
1 VDD
2 DRI1
3 FB1
4 GND
DRI3 8
7
FB3
6
DRI2
FB2 5
RT9174
D1
1N4148
R8
1K
#TYPEDET
VTTESL
R9
VTTPG
1K
R10
1K
C8
0.01uF
Q3
MMBT3904
3.3V
Q2
2SD1802
R4
250
R11 R5
374 200
C3
470uF
VTT
R6
3K
C7
1uF R12
8.2K
www.richtek.com
2
Figure 2. Dual LDOs with VTTPG for VRM 8.5 Application
DS9174-06 March 2007
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