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RT9185B Datasheet

  • RT9185B

  • SHDN. EN. BP. FTR and POK2

  • 16頁

  • ETC

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RT9185
Triple, Ultra-Fast CMOS LDO Regulator
General Description
The RT9185 series are an efficient, precise triple-
channel CMOS LDO regulator specifically designed
for mother-board application. The device is intended
to powering the standby voltage in which 3.3V_PCI,
2.5V_Clock and 1.8V_ICH2 or 1.5V_ICH4 core
voltage of the PC based computer system.
Moreover, it is also optimized for CD/DVD-ROM,
CD/RW, XDSL Router or IA equipments applications.
The regulator outputs are capable of sourcing 1.5A,
0.8A and 0.3A of output current respectively.
The RT9185 also works with low-ESR ceramic
capacitors, reducing the amount of board space
necessary for power applications. The other features
include faster transient response, low dropout voltage,
high output accuracy, current limiting and thermal
shutdown protections.
The RT9185 regulators are available in fused SOP-8,
5-lead TO-252 and 5-lead TO-263 packages.
Features
Fixed Output Voltages: 3.35V at 1.5A, 2.55V at
0.8A and 1.5V or 1.8V at 0.3A
Low Quiescent Current (Typically 0.4mA)
Operating Voltage Ranges: 3.5V~5.5V
Ultra-Fast Transient Response
Tight Load and Line Regulation
Current Limiting Protection
Thermal Shutdown Protection
Only low-ESR Ceramic Capacitors Required
for Stability
Custom Voltage Available
Applications
Mother-board Power Supply
CD/DVD-ROM, CD/RW
XDSL Router
IA Equipments
Cable Modems
Pin Configurations
Part Number
RT9185 CS
(Plastic SOP-8)
Pin Configurations
Ordering Information
RT9185
Package Type
S : SOP-8
L5 : TO-252-5
M5 : TO-263-5
Operating Temperature Range
C: Commercial Standard
VOUT3
A : 1.8V
B : 1.5V
Other voltage versions please
contact RichTek for detail.
VOUT1
VDD
VOUT2
VOUT3
1
2
3
4
8
7
6
5
GND
GND
GND
GND
RT9185 CL5
(Plastic TO-252-5)
TOP VIEW
1.
2.
3.
4.
VOUT1
VDD
GND (TAB)
VOUT2
1 2 3 4 5
5. VOUT3
TOP VIEW
1.
2.
3.
4.
5.
VOUT1
VDD
GND (TAB)
VOUT2
VOUT3
RT9185 CM5
(Plastic TO-263-5)
1 2 3 4 5
DS9185-02 July 2003
www.richtek.com
1

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