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參數(shù)資料
| 型號(hào)： | RT9173CGSP |
| 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)： | 2/13頁 |
| 文件大小： | 235K |
| 代理商： | RT9173CGSP |
RT9173C
2
DS9173C-12 September 2007
www.richtek.com
Functional Pin Description
VIN (Pin 1)
Input voltage which supplies current to the output pin. Connect this pin to a well-decoupled supply voltage. To prevent the
input rail from dropping during large load transient, a large, low ESR capacitor is recommended to use. The capacitor
should be placed as close as possible to the VIN pin.
GND [Pin 2, Exposed pad (9)]
Common Ground (Exposed pad is connected to GND). The GND pad area should be as large as possible and using many
vias to conduct the heat into the buried GND plate of PCB layer.
VCNTL (Pin 6)
VCNTL supplies the internal control circuitry and provides the drive voltage. The driving capability of output current is
proportioned to the VCNTL. Connect this pin
to 3.3V bias
supply to handle large output current with at least 10
μ
F
capacitor from this pin to GND.
REFEN (Pin 3)
Reference voltage input and active low shutdown control pin. Two resistors dividing down the VIN voltage on the pin to
create the regulated output voltage. Pulling the pin to ground turns off the device by an open-drain, such as 2N7002,
signal N-Channel MOSFET.
VOUT (Pin 4)
Regulator output. VOUT is regulated to REFEN voltage that is used to terminate the bus resistors. It is capable of sinking
and sourcing current while regulating the output rail. To maintain adequate large signal transient response, typical value
of 1000
μ
F AL electrolytic capacitor with 10
μ
F ceramic capacitors are recommended to reduce the effects of current
transients on VOUT.
NC (Pin 5, 7, 8)
No Internal Connect.
Typical Application Circuit
R
1
= R
2
= 100k
Ω
, R
TT
= 50
Ω
/ 33
Ω
/ 25
Ω
C
OUT(MIN)
= 10
μ
F (Ceramic) + 1000
μ
F under the worst case testing condition
C
SS
= 1
μ
F, C
IN
= 470
μ
F (Low ESR), C
CNTL
= 47
μ
F
VIN
REFEN
GND
VCNTL
VOUT
RT9173C
EN
2N7002
R
1
R
2
C
SS
V
IN
= 2.5V/1.8V/1.5V
V
CNTL
= 3.3V
C
CNTL
C
IN
R
TT
C
OUT
GND
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