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參數(shù)資料
| 型號(hào)： | RT9173DPSP |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Cost-Effective, Peak 3A Sink/Source Bus Termination Regulator |
| 中文描述： | 成本效益，峰值3A條接收器/源總線終端穩(wěn)壓器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 233K |
| 代理商： | RT9173DPSP |
RT9173D
10
DS9173D-05 September 2007
www.richtek.com
General Regulator
The RT9173D could also serves as a general linear
regulator. The RT9173D accepts an external reference
voltage at REFEN pin and provides output voltage regulated
to this reference voltage as shown i
n Figure 3, where
V
OUT
= V
EXT
x R2/(R1+R2)
As other linear regulator, dropout voltage and thermal issue
should be special
ly considered. Figure 4 and 5 show the
R
DS(ON)
over temperature of RT9173D in PSOP-8 (Ex
posed
Pad) package. The minimum dropout voltage could be
obtained by the product of R
DS(ON)
and output current. For
thermal consideration, please refer to the relative sections
.
Application Information
Consideration while designs the resistance of voltage
divider
Make sure the sinking current capability of pull-down NMOS
if the lower resistance was chosen so that the voltage on
V
REFEN
is below 0.2V.
In addition, the capacitor and voltage divider form the low-
pass filter. There are two reasons doing this design; one is
for output voltage soft-start while another is for noise
immunity.
How to reduce power dissipation on Notebook PC or
the dual channel DDR SDRAM application
In notebook application, using RichTek's Patent
“
D
istributed Bus Terminator Topology
”
with choosing
RichTek's product is encouraged.
Distributed Bus Terminating Topology
Figure 2
Figure 4
Figure 5
R0
R9
R8
R7
R6
R5
R4
R3
R2
R1
R(2N)
R(2N+1)
RT9173D
RT9173D
VOUT
VOUT
REFEN
BUS(0)
BUS(1)
BUS(2)
BUS(3)
BUS(4)
BUS(5)
BUS(6)
BUS(7)
BUS(8)
BUS(9)
BUS(2N)
BUS(2N+1)
Terminator Resistor
R
DS(ON)
vs. Temperature
0.10
0.15
0.20
0.25
0.30
0.35
0.40
-50
-25
0
25
50
75
100
125
Temperature
R
D
(
)
(
°
C)
V
CNTL
= 5V
R
DS(ON)
vs. Temperature
0.10
0.15
0.20
0.25
0.30
0.35
0.40
-50
-25
0
25
50
75
100
125
Temperature
R
D
)
(
°
C)
V
CNTL
= 3.3V
Figure 3
VCNTL
REFEN
GND
VIN
VOUT
RT9173D
V
EXT
R1
R2
V
OUT
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| RT9174PS | 制造商:Richtek Technology Corporation 功能描述: |
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