PCN20070902

Product Change Notices
PCN No.:20070902
Date: 09/28/2007
This is to inform you that AT9173 datasheet has been changed from Rev. B.01 to
Rev. C.01. This notification is for your information and concurrence.
If you require data or samples to qualify this change, please contact AME, Inc.
within 30 days of receiving of this notification.
If we do not receive any response from you within 30 calendar days from the
date of this notification, we will consider that you have accepted this PCN.
If you have any questions concerning this change, please contact:
PCN Originator:
Name: Fanny Hsieh
Email: [email protected]
Expected 1st Device Shipment Date: N/A
Earliest Year/Work Week of Changed Product: N/A
Description of Change:
Changed output sourcing and sinking capability from 3A to 2.5A. Deleted
waveforms of Load Transient Response: IOUT = 0A, 3A, 0A and Load Transient
Response: IOUT = -0A, -3A, -0A.
Reason for Change:
After volume evaluation we change the output source and sink capability.
QPM018B-B
AME, Inc.
AT9173
Bus Termination Regulator
n Features
n General Description
Support Both DDR I (1.25VTT) and DDR II
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
The voltage output of the regulator can be used as a
termination voltage for DDR SDRAM.
Adjustable VOUT by External Resistors
Minimum External Components
Current limits in both sourcing and sinking mode, plus
on-chip thermal shutdown make the circuit tolerant of
the output fault conditions.
Shutdown for Standby or Suspend Mode
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.
(0.9VTT) Requirements
Operation with High-impedance Output
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
AT9173 A-SOP 8
DDR_2.5 V
1
R2
100K
C4
0.1 uF
C2
470uF
2
3
4
R4
100K
1
VIN
VCNTL
GND
VCNTL
REFEN
VCNTL
VOUT
VCNTL
AT9173 A
SOP-8
VCC_ 3.3 V
8
7
6
DDR_VTT
1.25V/1.5A
5
C8
4.7uF
C6
470uF
Rev. C.01
AME, Inc.
Bus Termination Regulator
AT9173
n Typical Application(Contd.)
C3
0.1uF
C4
470uF
2
3
4
R3
100K
VIN
NC
GND
NC
REFEN
VOUTL
G ND_PA D
1
R1
100 K
VCC_ 3.3V
AT9173 E-SOP 8 / PP
DDR_2.5V
VCNTL
NC
8
7
6
DDR_ VTT
1 .25V /2A
5
C7
4.7uF
AT9173 E
SOP-8/PP
C5
470uF
n Function Block Diagram
VCNTL
Thermal
Sensor
VIN
+
VOUT
Thermal
&
Over Current
Protection Circuit
REFEN
VCNTL
+
GND
2
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Pin Configuration
SOP- 8
Top View
8
7
6
SOP- 8/PP
Top View
5
AT9173
1
2
3
4
AT9173A
1. IN
2. GND
3. REFEN
4. OUT
5. VCNTL
6. VCNTL
7. VCNTL
8. VCNTL
8
7
6
5
AT9173
1
2
3
4
AT9173E
1. IN
2. GND
3. REFEN
4. OUT
5. NC
6. VCNTL
7. NC
8. NC
n Pin Description
Pin name
IN
GND
Pin Description
Input voltage pin which supplies current to the V OUT pin. Connect this pin to a welldecoupled voltage to prevent the input rail from dropping during large load transient. A
large and low ESR capacitor is recommended to use that should be placed as close as
possible to the V IN pin.
Ground pin. Tie directly to ground plance.
VCNTL
Voltage control pin which 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 5V bias supply to handle large output current with at least 1uF capacitor from
this pin to GND. An important note is that VIN should be kept lower or equal to VCNTL.
REFEN
Reference voltage input and active low shutdown control pin. Two resistors dividing
down the VIN voltage on this pin to create the regulatedoutput voltage. Pulling this pin to
GND to turn off the device by an open-drain, such as 2N7002 N-Channel MOSFET.
OUT
Regulator output. V OUT is regulated from 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 1000uF
electrolytic capacitor with 10uF ceramic capacitors are recommended to reduce the
effects of current transients on VOUT.
NC*
No Connection. Not internal connected.
GND Pad*
Connected to GND plance for better heat dissipation.
* By SOP-8/PP only
3
Rev. C.01
AME, Inc.
Bus Termination Regulator
AT9173
n Ordering Information
Part Number
Marking
Output Voltage
Package
AT9173AG
AT9173AG
yyww* AB
xxxxxxx##**
ADJ
SOP-8
Operating Temp. Range
o
o
-25 C to +85 C
AT9173EG
AT9173EG
yyww* AC
xxxxxxx##**
ADJ
SOP-8/PP
Note:
* yy and ww represents the data code.
** XXXXXXX represents the wafer lot number, ## represents the wafer number
4
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Absolute Maximum Ratings
Parameter
Symbol
Maximum
Unit
VIN
6
V
ESD Rating (Human Body Mode)
VESD
2
KV
Storage Temperature
TSTG
150
O
C
TL
245
O
C
Input Voltage. VIN to GND
Lead Temperature (Soldering. 5sec)
n Recommended Operating Conditions
Parameter
Symbol
Rating
Unit
VIN
1.8 to 3.3
V
Supply Voltage to VCNT
VCNT
3.3
V
Output Current of VOUT Pin *
*IOUT
-2 to 2
A
TJ
-25 to 125
Supply Voltage to VIN
Junction Temperature
O
C
*The symbol "+" means the VOUT sources current to load; the symbol "-" means the VOUT
sinks current to GND
n Thermal Characteristics
Parameter
Thermal Resistance*
(Junction to Case)
Thermal Resistance
(Junction to Ambient)
Package
SOP-8
SOP-8/PP
SOP-8
SOP-8/PP
SOP-8
Internal Power Dissipation
SOP-8/PP
5
Die Attch
Non-Conductive
Epoxy
Conductive
Epoxy
Non-Conductive
Epoxy
Conductive
Epoxy
Non-Conductive
Epoxy
Conductive
Epoxy
Symbol Maximum
Unit
55
JC
19
O
C/W
120
JA
84
PD
1300
mW
1450
Rev. C.01
AME, Inc.
Bus Termination Regulator
AT9173
n Electrical Specifications
Limits in standard typeface are for TA=25℃, unless otherwise specified:
VIN=2.5V, VCNTL=3.3V, VREFEN =0.5V IN.
Parameter
Output Offset Voltage
Load Regulation
(DDR 1/2)
Test Condition
Symbol
VOS
VLOAD
Min
Typ
Max
Units
I OUT=0A (Note 1)
-20
0
20
mV
I L=0~1.5A (Fig 4)
-20
0
20
I L=0~-1.5A
-20
0
20
1.6
2.5/1.8
4
2.5
3.3
6
mV
Input Voltage Range (DDR
1/2)
V CNTL
KEEP VCNTL ≥ VIN on operation
power on and power off
Operating Current of VCNTL
ICNTL
No Load
Current In Shutdown Mode
ISHDN
VREFEN < 0.2V, RL=180Ω (Fig 5)
SOP-8 Current Limit
ILIMIT
Fig 6,7
2.1
A
PSOP-8 Current Limit
ILIMIT
Fig 6,7
2.4
A
TSD
3.3V
VIN
V
1.4
mA
25.6
µA
Short Circuit Protection
Over Temperature Protection
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
≤ VCNTL ≤ 5 V
125
O
C
Guaranteed by design
30
Note1: VOS offset is the voltage measurement defined as VOUT subtracted from VREFEN .
6
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Application Information
VCNTL = 5 V
VIN = 1.8V
R TT
R1
REFEN
2N7002
EN
R2
VCNTL
VIN
C SS
AT9173
C IN
C CNTL
VOUT
GND
COUT
R DUMMY
R1 = R2 = 100K , RTT = 50 / 33 / 25
COUT(MIN) = 10uF (Ceramic) + 1000uF under the worst case testing condition
RDUMMY = 1K as for VOUT discharge when VIN is not presented but VCNTL is presented
CSS = 1uF, CIN = 470uF (Low ESR), CCNTL = 47uF
n Application Circuit
n General Regulator
Typical application circuit is used as a regulator to provide
termination voltage in double data rate (DDR) memory
system. The regulator could source and sink up to 2A peak
current. The output voltage will follow REFEN which
generated by two external dividing resistors down from VIN
or to the desired output voltage set externally by forcing a
voltage level to REFEN pin. To add a shutdown function ,
connect a small transistor to REFEN pin. To perform
shutdown function , put a logic high 5V signal to EN yield a
low (0V) to REFEN pin thus force output voltage to zero
voltage. The capacitor Css is used to softstart the output
voltage since VOUT will follow REFEN.
The AT9173 can be used as a general regulator.
To get a desired output voltage, put a reference
voltage to REFEN pin or dividing resistors down a
input voltage source. To drive inside N-Channel
MOSFET the VCNTL should be larger than VIN to get
enough driving voltage. The minimum dropout
voltage could be IOUT*0.1, where IOUT is the output
current.
Time constant for this circuit is Css*(R1//R2). The Css
could also used as the bypass capacitor to filter out noise in
REFEN pin. So carefully layout should put Css close to
REFEN pin to maintain noise immunity. The CIN an CCNTL is
used as power decoupling capacitor. COUT is composed of
10uF ceramic plus 1000uF electrolyte capacitors. The first
one is to used as high frequency filter and the second one is
used to reduce voltage drop during load regulating.
7
n Layout issue
Place a bypass capacitor as close as possible to
VIN and VCNTL pin is necessary. A low ESR
capacitor is recommended for this bypass
capacitor. Use wide and short PCB traces to
connect in between VIN power source VOUT to
reduce PCB resistance thus to reduce undesired
power dissipation.
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
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 is
PD = (V IN − V OUT ) xI OUT
And also the maximum power dissipation is
PD , MAX = (T J , MAX − T A ) / θ JA
Where Tj,max is the maximum operation junction 125 degree C, Ta is the ambient temperature and the is θ JA
the junction to ambient thermal resistance. The junction to ambient thermal resistance is 70 ℃ /W for exposed
pad SOP-8 package. It can be dramatically reduced by placing a large area PCB trace under exposed pad to
emit heat generated by the die attached to the exposed pad.
8
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Test Circuit
Fig 4: Output Voltage Tolerance, △ VOUT
Fig 5: Current in Shutdown Mode, ISHDN
9
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
Figure 6: Current Limit for High Side, ICLHIGH
Figure 7: Current Limit for Low Side, ICLLOW
10
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Typical Characteristics
Quiescent VCNTL Current (mA)
Quiescent VCNTL Current vs Junction Temperature
Junction Temperature (C)
Vout Offset Voltage
Voltage Offset Voltage vs Junction Temperature
Junction Temperature
11
Rev. C.01
AME, Inc.
Bus Termination Regulator
AT9173
n Operation Waveforms DDR1
Load Transient Response
VIN=2.5V, VCNTL=3.3V
VREF is 1.25V supplied by a regulator
COUT=1000uF/35V
IOUT slew rate = +-0.25A/mS
+ 0 A → + 1.5 A → + 0 A
+0A →+ 2 A → + 0 A
+ 0 A → + 2.5 A → + 0 A
Ch1= IOUT , Ch4= VOUT
Ch1= I OUT , Ch4= V OUT
Ch1= IOUT , Ch4= VOUT
- 0 A → - 1.5 A → - 0 A
-0A → -2A → - 0A
- 0 A → - 2.5 A → - 0 A
Ch1= I OUT , Ch4= VOUT
Ch1= IOUT , Ch4= V OUT
Ch1= IOUT , Ch4= VOUT
Load Transient Response
VIN=2.5V, VCNTL=3.3V
VREF is 1.25V supplied by a regulator
COUT=1000uF/35V
IOUT slew rate = +-0.25A/mS
12
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n Date Code Rule
Marking
Date Code
Year
A
A
A
W
W
xxx0
A
A
A
W
W
xxx1
A
A
A
W
W
xxx2
A
A
A
W
W
xxx3
A
A
A
W
W
xxx4
A
A
A
W
W
xxx5
A
A
A
W
W
xxx6
A
A
A
W
W
xxx7
A
A
A
W
W
xxx8
A
A
A
W
W
xxx9
n Tape and Reel Dimension
SOP- 8
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
13
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOP-8
12.0±0.1 mm
4.0±0.1 mm
2500pcs
330±1 mm
Rev. C.01
AME, Inc.
Bus Termination Regulator
AT9173
n Tape and Reel Dimension
SOP- 8/PP
P
W
AME
AME
PIN 1
Carrier Tape, Number of Components Per Reel and Reel Size
14
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
SOP-8/PP
12.0±0.1 mm
4.0±0.1 mm
2500pcs
330±1 mm
Rev. C.01
AME, Inc.
AT9173
Bus Termination Regulator
n SOP-8/SOP-8/PP package Information
SOP-8
Top View
Side View
SYMBOLS
E
MAX
A
1.35
1.75
0.05315 0.068898
A1
0.10
0.30
0.00394 0.011811
A2
D
L
θ
Front View
A
A2
A1
e
1.473 REF
MIN
MAX
0.05799 REF
B
0.33
0.51
0.01299 0.020079
C
0.19
0.25
0.00748 0.009843
D
4.80
5.33
0.18898 0.209843
E
3.80
4.00
0.14961
1.27 BSC
e
7 o(4X)
INCHES
MIN
C
H
MILLIMETERS
0.15748
0.05000 BSC
L
0.40
1.27
0.01575
0.05000
H
5.80
6.30
0.22835
0.24803
y
-
0.10
-
0.00394
θ
o
0
8
o
0
o
8o
B
SOP-8/PP
SYMBOLS
INCHES
MIN
MAX
MIN
MAX
A
-
1.700
-
0.067
A1
0.050
0.150
0.002
0.006
A2
1.350
1.550
0.053
0.061
C
0.100
0.250
0.004
0.010
E
3.750
4.150
0.148
0.163
E1
5.700
6.300
0.224
0.248
L
0.300
0.700
0.012
0.028
b
0.310
0.510
0.012
0.020
D
4.720
5.120
0.186
0.202
e
θ
15
MILLIMETERS
1.270 BSC
0
o
8
0.05 BSC
o
0
o
8
o
Rev. C.01
www.ame.com.tw
E-Mail: [email protected]
Life Support Policy:
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
of AME, Inc.
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.
 AME, Inc. , July 2007
Document: ATT-DS9173-C.01
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U.S.A (Subsidiary)
AME, Inc.
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2F, 302 Rui-Guang Road, Nei-Hu District
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Tel: 886 2 2627-8687
Fax: 886 2 2659-2989
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Tel : (408) 988-2388
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