at9173eg

Manufacturer Part Numberat9173eg
DescriptionBus Termination Regulator
ManufacturerAME, Inc.
at9173eg datasheet
 


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AME, Inc.
AT9173
n General Description
The AT9173 is a voltage regulator which could
convert the input voltage ranging from 1.8V to 5V to an
output voltage that user settled. The regulator can
provide sourcing or sinking current.The AT9173, 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.
n Applications
DDRI/DDRII Memory Termination Supply
Active Termination Buses
Desktop PC,NoTebook,Server and workstation
Graphic Card
Set Top Box
Embedded System
n Typical Application
DDR _2.5 V
C4
R2
0.1 uF
100KO
R4
100KO
Rev. C.05
n Features
AT9173 A-SOP 8
VIN
VCNTL
1
C2
VCNTL
GND
2
470uF
VCNTL
REFEN
3
VOUT
VCNTL
4
AT9173A
SOP-8
Bus Termination Regulator
Support Both DDR I (1.25VTT) and DDR II
(0.9VTT) Requirements
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
by External Resistors
OUT
Minimum External Components
Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
VCC_ 3.3 V
8
7
6
DDR_VTT
5
1.25V/1.5A
C 6
C 8
470uF
4.7uF
1

at9173eg Summary of contents

  • Page 1

    ... AME, Inc. AT9173 n General Description The AT9173 is a voltage regulator which could convert the input voltage ranging from 1. output voltage that user settled. The regulator can provide sourcing or sinking current.The AT9173, used in conjunction with series termination resistors, provides an excellent voltage source for active ...

  • Page 2

    ... AME, Inc. AT9173 n Typical Application(Contd.) DDR_2. 0.1uF 100 KO R3 100KO n Function Block Diagram Thermal Sensor REFEN 2 AT9173 E-SOP VIN 1 GND C4 2 470uF REFEN VCNTL 3 VOUTL 4 AT9173E SOP-8/ Thermal & Over Current Protection Circuit + - Bus Termination Regulator VCC_ 3. ...

  • Page 3

    ... AME, Inc. AT9173 n Pin Configuration SOP- 8 Top View AT9173 Pin Description Pin name Input voltage pin which supplies current to the V decoupled voltage to prevent the input rail from dropping during large load transient large and low ESR capacitor is recommended to use that should be placed as close as ...

  • Page 4

    ... Part Number AT9173AG AT9173EG Note and ww represents the data code. ** XXXXXXX represents the wafer lot number, ## represents the wafer number 4 Marking Output Voltage AT9173AG yyww* AB ADJ xxxxxxx##** AT9173EG yyww* AC ADJ xxxxxxx##** Bus Termination Regulator Package Operating Temp. Range SOP +85 SOP-8/ Rev ...

  • Page 5

    ... AME, Inc. AT9173 n Absolute Maximum Ratings Parameter Input Voltage GND IN VCNTL to GND ESD Rating (Human Body Mode) Storage Temperature n Recommended Operating Conditions Parameter Supply Voltage 1 Supply Voltage 2 Output Current of V Pin * OUT Junction Temperature *The symbol "+" means the VOUT sources current to load; the symbol "-" means the VOUT ...

  • Page 6

    ... AME, Inc. AT9173 n Electrical Specifications Limits in standard typeface are for T V =2.5V, V =3.3V, V =0.5V IN CNTL REFEN Parameter Output Offset Voltage Load Regulation (DDR 1/2) Input Voltage Range (DDR 1/2) Operating Current of V CNTL Current In Shutdown Mode Short Circuit Protection SOP-8 Current Limit PSOP-8 Current Limit ...

  • Page 7

    ... AME, Inc. AT9173 n Application Information V = 3.3V CNTL 2N7002 100KO 50O / 33O / 25O 10uF (Ceramic) + 1000uF under the worst case testing condition OUT(MIN 1KO as for V discharge when V DUMMY OUT C = 1uF 470uF (Low ESR Application Circuit ...

  • Page 8

    ... AME, Inc. AT9173 n Thermal issue AT9173 has a internal thermal protection to protect the device at any overload conditions. For safety reason the operation junction temperature should not exceed 125 ℃. The dissipation of the device OUT OUT And also the maximum power dissipation is ...

  • Page 9

    ... AME, Inc. AT9173 n Test Circuit Rev. C.05 Fig 4: Output Voltage Tolerance, Fig 5: Current in Shutdown Mode, I Bus Termination Regulator △ V OUT SHDN 9 ...

  • Page 10

    ... AME, Inc. AT9173 10 Figure 6: Current Limit for High Side, I Figure 7: Current Limit for Low Side, I Bus Termination Regulator CLHIGH CLLOW Rev. C.05 ...

  • Page 11

    ... AME, Inc. AT9173 n Typical Characteristics Rev. C.05 Bus Termination Regulator 11 ...

  • Page 12

    ... AME, Inc. AT9173 n Operation Waveforms DDR1 Load Transient Response V =2.5V, V =3.3V IN CNTL V is 1.25V supplied by a regulator REF C =1000uF/35V OUT I slew rate = +-0.25A/mS OUT + 0 A → + 1.5 A → Ch4 = VOUT Ch1= I OUT Load Transient Response V =2.5V, V =3.3V IN CNTL V is 1.25V supplied by a regulator ...

  • Page 13

    ... AME, Inc. AT9173 n Operation Waveforms DDR2 Load Transient Response V =1.8V, V =3.3V IN CNTL V is 0.9V supplied by a regulator REF C =1000uF/35V OUT I slew rate = +-0.25A/mS OUT + 0 A → + 1.5 A → Ch1 Ch4= I OUT OUT Load Transient Response V =1.8V, V =3.3V IN CNTL V is 0.9V supplied by a regulator REF C =1000uF/35V ...

  • Page 14

    ... AME, Inc. AT9173 n Date Code Rule Marking Date Code Tape and Reel Dimension SOP- 8 PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size ...

  • Page 15

    ... AME, Inc. AT9173 n Tape and Reel Dimension SOP- 8/PP PIN 1 Carrier Tape, Number of Components Per Reel and Reel Size Package Carrier Width (W) SOP-8/PP Rev. C.05 P AME AME Pitch (P) 12.0±0.1 mm 4.0±0.1 mm Bus Termination Regulator W Part Per Full Reel Reel Size 2500pcs 330± ...

  • Page 16

    ... AME, Inc. AT9173 n Package Dimension SOP-8 Top View E H PIN 1 D Front View o 7 (4X SOP-8/PP Top View Front View Side View C SYMBOLS L θ Side View SYMBOLS θ Bus Termination Regulator MILLIMETERS MIN MAX MIN A 1.35 1.75 0.05315 A 0 ...

  • Page 17

    ... These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. ...