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參數(shù)資料
| 型號： | RT9173C |
| 廠商： | Richtek Technology Corporation |
| 英文描述： | Cost-Effective, 2A Sink/Source Bus Termination Regulator |
| 中文描述： | 成本效益，甲匯/源總線終端穩(wěn)壓器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 235K |
| 代理商： | RT9173C |
RT9173C
10
DS9173C-12 September 2007
www.richtek.com
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
R0
R9
R8
R7
R6
R5
R4
R3
R2
R1
R(2N)
R(2N+1)
RT9173C
RT9173C
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
= 3.3V
Figure 3
General Regulator
The RT9173C could also serves as a general linear
regulator. The RT9173C 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)
For sourcing 2A output applications, the RT9173C could
works with low-ESR ceramic capacitors as a general linear
regulator. It offers significant cost and space savings for
power applications, especially for hand-held wireless
devices and notebooks application. The recommended
input and output capacitors must be 10
μ
F or greater X7R/
X5R ceramic capacitors. The input and output capacitors
should be located as close as possible to the IC.
It
’
s not recommended for sinking application while using
ceramic capacitors. When the sinking function is used with
ceramic capacitors, the system may be unstable. If the
current sinking function is necessary for this regulator,
please refer to the RT9173C Typical Application Circuit as
shown on page 2 for component selection.
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 RT9173C 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
.
VCNTL
REFEN
GND
VIN
VOUT
RT9173C
V
EXT
R1
R2
V
OUT
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|---|---|
| RT9173CGSP | 功能描述:IC REG BUS TERMINATION 2A 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| RT9173DGSP | 功能描述:IC REG BUS TERMINATION 3A 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| RT9173GS | 功能描述:IC REG BUS TERMINATION 1.5A 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| RT9173PS | 制造商:RICHTEK 功能描述:REGULATOR |
| RT9174GS | 功能描述:IC REG CTRLR TRPL POS ADJ 8SOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性晶體管驅(qū)動器 系列:- 產(chǎn)品培訓(xùn)模塊:More Information on LDOs 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:正，固定式 輸出數(shù):2 輸出電壓:2.8V，3.3V 電流 - 電源:12mA 輸入電壓:5 V ~ 22 V 工作溫度:0°C ~ 70°C 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC 包裝:帶卷 (TR) |
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