AME, Inc.
AME9172
n
General Description
The AME9172 is a voltage regulator which could con-
vert the input voltage ranging from 1.3V to 6V to an output
voltage that user settled. The regulator can provide sourc-
ing or sinking current. The AME9172 used in conjunc-
tion with series termination resistors, provides an excel-
lent 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.
Bus Termination Regulator
n
Features
l
Support Both DDR 1 (1.25VTT), DDR 2
(0.9VTT) & DDR 3 (0.75VTT) Requirements
l
Capable of Sourcing and Sinking Current
l
Current-limiting Protection
l
Thermal Protection
l
Integrated Power MOSFETs
l
Generates Termination Voltages for SSTL-2
l
High Accuracy Output Voltage at Full-Load
l
Adjustable VOUT by External Resistors
l
Minimum External Components
l
Shutdown for Standby or Suspend Mode
Operation with High-impedance Output
l
All AME’s Lead Free Products Meet RoHS
Standards
n
Applications
l
DDR Memory Termination Supply
l
Active Termination Buses
l
Desktop PC/AGP Graphics
l
Supply Splitters
l
Set Top Box/IPC
1
Rev. A.01
AME, Inc.
AME9172
n
Block Diagram
VCNTL
VIN
Bus Termination Regulator
Thermal
Sensor
Thermal
+
-
VOUT
&
Over
Current
REFEN
Protection
circuit
+
-
VCNTL
GND
2
Rev. A.01
AME, Inc.
AME9172
n
Application Circuit
Bus Termination Regulator
DDR_2.5V
AME9172AAHAZ
SOP-8
VIN
GND
REF
VOUT
VCNT
VCNT
VCNT
VCNT
VCC_3V
1
R2
100K
C4
0.1µ
C2
470µ
8
7
6
5
DDR_VTT
1.25V/1.5A
2
3
4
R4
100K
C8
4.7u
C6
470u
AME9172AAHAZ
SOP-8
Fig 1 : Application Circuit AME9172AAHAZ
DDR_2.5V
1
C3
R1
0.1µ
C4
470µ
AME9172AAZAZ
SOP-8/PP
VCC_3V
VIN
GND_PAD
NC
NC
VCNT
NC
8
7
6
5
DDR_VTT
1.25V/2A
2
3
4
GND
REF
VOUT
100K
R3
100K
C7
4.7µ
C
5
470µ
AME9172AAZAZ
SOP-8/PP
Fig 2 : Application Circuit AME9172AAZAZ
3
Rev. A.01
AME, Inc.
AME9172
n
Pin Configuration
Part Number
Pin Configurations
Bus Termination Regulator
VIN
AME9172AAHAZ
(SOP-8)
1
2
3
8
7
6
5
VCNTL
VCNTL
VCNTL
VCNTL
GND
REFEN
VOUT
4
AME9172 Pin Assignment
Part Number
Pin Configurations
AME9172AAZAZ
(SOP-8/PP)
VIN
GND
REFEN
VOUT
1
2
3
4
8
7
6
5
NC
NC
VCNTL
NC
NC= No internal connection
= Thermal Pad (Connected to GND plane
for better heat dissipation). The Pad of dimension
is 0.090 x 0.090 (Inch)
AME9172 Pin Assignment
4
Rev. A.01
AME, Inc.
AME9172
n
Ordering Information
AME9172
x x x x x
Special Feature
Number of Pins
Package Type
Operating Ambient Temperature Range
Pin Configuration
Operating Ambient
Temperature Range
A: -25
O
C to 85
O
C
Number
of
Pins
A: 8
Bus Termination Regulator
Pin Configuration
Package Type
Special Feature
A: 1. VIN
(SOP-8)
2. GND
3. REF
4. VOUT
5. VCNT
6. VCNT
7. VCNT
8. VCNT
A: 1. VIN
(SOP-8/PP)
2. GND
3. REF
4. VOUT
5. NC
6. VCNT
7. NC
8. NC
H: SOP
Z: SOP/PP
Z: Lead free
n
Ordering Information
Part Number
AME9172AAHAZ
Marking*
9172
AAHA
yyww
9172
AAZA
yyww
Output Voltage
N/A
Package
SOP-8
Operating Ambient
Temperature Range
-25
o
C to 85
o
C
AME9172AAZAZ
N/A
SOP-8/PP
-25
o
C to 85
o
C
Note: yyww represents the date code.
* A line on top of the first letter represents lead free plating such as 9172
Please consult AME sales office or authorized Rep./Distributor for package type availability.
5
Rev. A.01
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