RT9173BCS Richtek Technology Corporation, RT9173BCS Datasheet

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RT9173BCS

Manufacturer Part Number
RT9173BCS
Description
2 A Bus Termination Regulator
Manufacturer
Richtek Technology Corporation
Datasheet

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Company
Part Number
Manufacturer
Quantity
Price
Part Number:
RT9173BCS
Manufacturer:
RICHTEK
Quantity:
17 270
Part Number:
RT9173BCS
Manufacturer:
RICHTEK/立锜
Quantity:
20 000
General Description
The RT9173B regulator is designed to convert
voltage supplies ranging from 1.7V to 6V into a
desired output voltage of which adjusted by two
external voltage divider resistors. The regulator is
capable of sourcing or sinking up to 2A of current
while regulating an output voltage to within 40mV.
The RT9173B, used in conjunction with series
termination resistors, provides an excellent voltage
source for active termination schemes of high speed
transmission lines as those seen in high speed
memory buses and distributed backplane designs.
The voltage output of the regulator can be used as a
termination voltage for DDR SDRAM.
Current limits in both sourcing and sinking mode, plus
on-chip thermal shutdown make the circuit tolerant of
the output fault conditions.
The RT9173B are available in the popular 5-lead
TO-252 and fused SOP-8 (the multiple V
the SOP-8 package are internally connected but
lowest thermal resistance) surface mount packages.
Ordering Information
RT9173B
DS9173B-00
June 2003
Package Type
S : SOP-8
L5 : TO-252-5
Operating Temperature Range
C: Commercial Standard
CNTL
pins on
Preliminary
2A Bus Termination Regulator
Features
Applications
Pin Configurations
RT9173BCS
(Plastic SOP-8)
RT9173BCL5
(Plastic TO-252-5)
Support Both DDR I (1.25V
(0.9V
SOP-8 and TO-252-5 Packages
Capable of Sourcing and Sinking Current
Current-limiting Protection
Thermal Protection
Integrated Power MOSFETs
Generates Termination Voltages for SSTL-2
High Accuracy Output Voltage at Full-Load
Adjustable V
Minimum External Components
Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
DDR Memory Termination Supply
Active Termination Buses
Desktop PC/AGP Graphics
Set Top Box/IPC
Supply Splitter
Part Number
TT
) Requirements
OUT
by External Resistors
REFEN
VOUT
1 2 3 4 5
GND
Pin Configurations
VIN
TT
1
2
3
4
TOP VIEW
) and DDR II
RT9173B
TOP VIEW
1. VIN
2. GND
3. VCNTL (TAB)
4. REFEN
5. VOUT
www.richtek.com
8
7
6
5
VCNTL
VCNTL
VCNTL
VCNTL
1

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RT9173BCS Summary of contents

Page 1

... Operation with High-impedance Output Applications DDR Memory Termination Supply Active Termination Buses Desktop PC/AGP Graphics pins on Set Top Box/IPC CNTL Supply Splitter Pin Configurations Part Number RT9173BCS (Plastic SOP-8) RT9173BCL5 (Plastic TO-252-5) RT9173B ) and DDR External Resistors OUT Pin Configurations TOP VIEW ...

Page 2

RT9173B Typical Application Circuit V = 3.3V CNTL C CNTL 2N7002 100KΩ 10µF (Ceramic) + 1000µF under the worst case test condition C OUT(min 1kΩ as for V ...

Page 3

Absolute Maximum Ratings Input Voltage Power Dissipation ESD Susceptibility (Note 2) Storage Temperature Range Lead Temperature (Soldering, 10 sec.) Package Thermal Resistance TO-252,θ JC SOP-8, θ JC Recommended Operating Conditions Junction Temperature Range Electrical Characteristics (V = 2.5V ...

Page 4

RT9173B Note 1. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the ...

Page 5

V REFEN 0.2V 1.25V V OUT 0V DS9173B-00 June 2003 Preliminary Power Supply with Current Limit 3.3V 2.5V VCNTL VIN RT9173B REFEN VOUT GND Fig.4 Current Limit for Low Side, I 3.3V VCNTL RT9173B REFEN GND V would ...

Page 6

RT9173B Typical Operating Characteristics Source Current Limit vs. Temperature Source Current vs. Temperature 3.8 3.4 3 2.6 2.2 1.8 -40 -25 - Temperature Sink Current Limit vs. Temperature Sink Current vs. Temperature 3 1.8V,V ...

Page 7

Output Voltage vs. Temperature 1. 2. 3.3V CNTL 1.255 1.25 1.245 1.24 -40 -25 - Temperature (°C) 0. Transient Response 0.9V REFEN Swing Frequency: 1kHz 100 ...

Page 8

RT9173B Output Short-Circuit Protection Source Force the output shorted to ground Time (1ms/DIV) Power Dissipation vs. Copper Area 300 125°C 250 200 150 65°C 100 50 0 ...

Page 9

... Minimize trace length and use wide traces between the voltage regulator output and the RT9173B V (Inductance, Resistance, and Capacitance), which can cause undesired ringing. The RT9173BCS regulator is packaged in plastic Terminator Resistor SOP-8 package. This small footprint package is unable to convectively dissipate the heat generated R0 BUS(0) when the regulator is operating at high current levels ...

Page 10

... RT9173B Use vias to conduct the heat into the buried or backside of PCB RT9173BCS (SOP-8) The PCB heat sink copper area should be solder-painted without masked. This approaches a “best case” pad heat sink. Fig. 6 Layout Consideration To prevent this maximum junction temperature from being exceeded, the appropriate power plane heat sink MUST be used ...

Page 11

Package Information Symbol DS9173B-00 June 2003 Preliminary Dimensions In Millimeters Min Max 4.801 5.004 3.810 3.988 1.346 1.753 0.330 0.508 0.406 1.270 1.194 1.346 ...

Page 12

RT9173B D A Symbol www.richtek.com 12 Preliminary Dimensions In Millimeters Min Max 2.184 2.388 0.381 0.889 4.953 5.461 0.457 0.889 5.334 ...

Page 13

DS9173B-00 June 2003 Preliminary RT9173B www.richtek.com 13 ...

Page 14

RT9173B RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com 14 Preliminary RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, ...

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