MDC_DDR Series.B03 Page 1 of 5
DDR Series
9A Active Power Power Terminator
for DDR Memories
www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
Typical topology is shown
FEATURES
For high performance termination of
DDR computer memory busses
Compatible to JEDEC JESD 79 and 8-9 DDR
specifi cations
Ideal for active wideband termination of
SSTL-2 logic
Non-isolated design with 1.25V typ. @
±9 Amps output
3-5.5V input with 85% (typ.) effi ciency
Miniature industry standard 1.6 x 0.5 x 0.2
inch surface mount or SIP package
Offers unique source/sink DDR requirements
plus automatic reference tracking
Retains controlled impedances and mini-
mizes distortion of DDR digital data
and double-side clocks
Operates over –40 to +65°C with
200 lfm airfl ow
Standard vertical mount, optional
horizontal mount
The DDR terminators are supplied in a 1.6 by
0.5inch surface-mount or SIP package measuring
only 0.2 inches high. Full output power (3.3VIN) is
available up to +65°Celsius with only 200 LFM
(linear feet per minute) of cooling airfl ow. No heat-
sink is required.
Modern SSTL-2 logic uses reduced power volt-
ages (typically 2.5 Volts), high switching currents
and a relatively narrow voltage threshold window
for logic switching. These factors contribute to
the 266MHz data transfer rate. The Vtt termination
voltage output of the DDR operates approximately
at the midpoint voltage of the bus (i.e, about 1.25V)
and therefore will either source or sink current up
to 9 Amps. To maintain a reliable window in the
logic threshold, the design tracks the Vref input
voltage at high bandwidth, operating typically at
one half the bus Vddq voltage of 2.5V. In addition,
the DDR series features a very high current slew
rate of up to 40 Amps per microsecond and fast
settling while switching from source to sink or sink
to source. These features insure no data errors on
the memory bus.
The DDR is supplied either in a vertical SIP
(Single Inline Package) mount or a horizontal
pinned mount. The converter meets UL 60950-1,
CSA and IEC safety certifi cations and both conduct-
ed and radiated EMI (electromagnetic interference)
specifi cations. The output is rated for continuous
short circuit protection and the on-board control-
ler will shut down the converter if the temperature
reaches 110°C or output current exceeds 11 Amps.
The DDR-9-W3H-C is available with RoHS reduc-
tion of hazardous substance compliance.
SIMPLIFIED SCHEMATIC
Designed for efficient termination of SSTL-2 (Series Stub Terminated Logic)
signals in DDR (Dual Data Rate) memories, the DDR series non-isolated
DC/DC converters are powered by the bus supply of 3 to 5.5Volts and
are compatible to industry-standard JEDEC JESD specifications for
DDR memories.
PRODUCT OVERVIEW
/6%2
4%-0%2!452%
2%-/4%
/./&&).
#/--/.
#/.42/,,%2 6
/54
3)'.!,
'2/5.$
3%.3%).
n3%.3%).
6
).
6
2%&
).054
#/--/.
Typical unit
MDC_DDR Series.B03 Page 2 of 5
DDR Series
9A Active Power Power Terminator
for DDR Memories
DDR MEMORY APPLICATION
$$2
!#4)6%
4%2-).!4/2
#/- #/-
n3%.3%
3%.3%
7
2%-/4%
/./&&
6
2%&
6
).
6
$$1
6 6
##
TO6
6
/54
6
44
6
2%&
3NUBBER!RRAY
LINES
TYPICAL
$)--
-EMORY-ODULES
$)--
.
!'0
'RAPHICS
0#)
"US
#05
-%-/29
#/.42/,,%2
"US
4RANSCEIVERS
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS
Pin Function P66 Pin Function P66
1+Sense Input 8 Common
2–Sense Input 9 Common
3On/Off Input 10 Common
4+Input 11 –Output
5+Input 12 –Output
6+Input 13 –Output
7Common 14 VREF Input
$)!
490
0,!34)#(%!$%2
#/00%2,%!$3
6%24)#!,-/5.4
1.60
(40.64)
HORIZONTAL MOUNT
0.50
(12.70)
1 2 3 4 5 6 7 8 9 14 13 12 11 10
Dimensions in inches (mm)
Case B9
Case B10
1.30
(33.02)
0.100 TYP (2.54)
0.13
(3.30)
0.045
(1.14)
0.020ر.001
(5.08)
COPPER LEADS
0.165
(4.19)
PLASTIC HEADER
0.35
(8.89)
Component locations are typical.
Actual units may vary slightly.
MDC_DDR Series.B03 Page 3 of 5
DDR Series
9A Active Power Power Terminator
for DDR Memories
Ordering Guide
Model Number Mounting
DDR-9-W3 Single Inline Package (vertical), non-RoHS
DDR-9-W3-C Single Inline Package (vertical), RoHS compliant
DDR-9-W3H Horizontal mount, non-RoHS
DDR-9-W3H-C Horizontal mounting, RoHS compliant
Performance/Functional Specifi cations
Typical at TA = +25°C under nominal line voltage, VOUT = 1.25V, full-load conditions unless noted.
Input
Input Voltage Range 3 to 5.5 Volts (3.3V nominal)
Start-Up Threshold 2 Volts min., 2.5 Volts typ.
Input Current, Current Sourcing Mode
At 3.3VIN, 1.25VOUT 4.15 Amps max.
At 3.3VIN, 0.9VOUT 3.18 Amps max.
At 5VIN, 1.25VOUT 2.75 Amps max.
At 5VIN, 0.9VOUT 2.13 Amps max.
Inrush Transient 0.003A2/sec, maximum
No-load Input Current 70mA typ., 100mA max.
Short Circuit Current 4 Amps
Shut Down Mode Input Current 7mA
Input Refl ected Ripple Current 10mAp-p
VREF Input Range 0.7 to 1.45V
VREF External Reference Current 0.1μA (VREF min. to max., IOUT = ±9A)
Remote On/Off Control
+Positive Logic On = no connection, open collector or
0.8V to +VIN max. applied at 60µA.
Off = 0 to 0.7V or pulled low.
Remote Sense Range + 10% of VOUT
Output
Maximum Output Power 11.36 Watts (VREF = 1.25V)
Minimum Loading No minimum load
Maximum Capacitive Loading 2000μF, OSCON low-ESR (0.02)
10,000μF (aluminum electrolytic)
Output Voltage Accuracy V
REF ±1%
Total Accuracy (Line, Load, Temp.) ±5%
Output Current, Source +9.00 Amps maximum
Output Current, Sink –9.00 Amps maximum
Short Circuit Current 13 Amps
Short Circuit Duration Continuous, output shorted to ground
Short Circuit Protection Fold back technique, autorecovery
Current Limit Inception 11 Amps, sourcing mode
Transfer Characteristics
Effi ciency, Current Sourcing Mode, 9A load
At 3.3VIN, 1.25VOUT 83% typ., 85% max.
At 3.3VIN, 0.9VOUT 78% typ., 80% max.
At 5VIN, 1.25VOUT 82.5% typ., 84.5% max.
At 5VIN, 0.9VOUT 77% typ., 79% max.
Effi ciency, Current Sinking Mode, 9A load
At 3.3VIN, 1.25VOUT 81% typ., 83% max.
At 3.3VIN, 0.9VOUT 74.5% typ., 76.5% max.
At 5VIN, 1.25VOUT 80% typ., 82% max.
At 5VIN, 0.9VOUT 73.5% typ., 75.5% max.
Temperature Coeffi cient ±0.02%/°C
Switching Frequency 550kHz min., 700kHz max.
Line Regulation (VIN = min. to max.) ±0.75%
Load Regulation (VIN = min. to max.) ±1.5%
Dynamic Characteristics
Output Slew Rate 40 Amps/μsec
Load Step, 0 to 9A 175mV, peak deviation
Load Step Settling Time, 0 to 9A 200μsec
Ripple and Noise, 20 MHz bandwidth 40mVp-p, typical
60mVp-p, maximum
Turn-On Time (Remote On/Off
or VIN to VOUT regulated) 5.5msec
Absolute Maximum Ratings
Input Voltage 7Vdc max., 100msec duration
Input Reverse Polarity None
Output Current Current-limited. Device can
withstand indefi nite short circuit.
Storage Temperature –55 to +125 °C
Lead Temperature +300°C, 10 seconds maximum
Absolute maximums are stress ratings. Exposure of devices to any of these conditions
may adversely affect long-term reliability. Proper operation under conditions other than
those listed in the Performance/Functional Specifi cations Table is not implied nor
recommended.
See Absolute Maximum Ratings for allowable input voltage.
Input Ripple Current is tested and specifi ed over a 5-20 MHz bandwidth. Input fi ltering is
C
IN = 200µF, CBUS = 1000µF, LBUS = 1µH.
Current limit inception is given at either cold start-up or after warm-up for VREF = 0.9 or
1.25V.
Mean Time Before Failure is calculated using the Telecordia (Bellcore) SR-332 Method 1,
Case 3, ground fi xed conditions, TCASE = +40°C, Full load.
Environmental
Operating Temperature Range (Ambient)
No derating, vertical mount –40 to +65°C @ 200 lfm airfl ow
Derating See derating curves
PCB/Case Temperature Range –40 to +100°C, no derating.
Thermal Protection/Shutdown 110°C
Storage Temperature Range –55 to +125°C
Altitude 0 to 10,000 feet
Relative Humidity 10% to 90%, non-condensing
Physical, Safety
Outline Dimensions 1.60 x 0.50 x 0.20 inches
40.64 x 12.7 x 5.08mm
Weight 0.25 ounces (7g)
Pin Material Nickel plate over copper alloy
Pin Dimensions 0.02 inches (0.508mm)
Calculated MTBF TBD hours
Electromagnetic Interference Conducted (FCC part 15, EN55055)
Radiated (FCC part 15, EN55055)
Safety UL/cUL 60950-1, CSA-C22.2 No.234
IEC/EN 60950-1
MDC_DDR Series.B03 Page 4 of 5
DDR Series
9A Active Power Power Terminator
for DDR Memories
Typical Performance Curves
$$27
%FFICIENCYVS,OAD#URRENT#URRENT3OURCING-ODE6/546
,OAD#URRENT!MPS
%FFICIENCY
6
).
6
6
).
6
86
84
82
80
78
76
74
72
70
DDR-9-W3
Efficiency vs. Load Current (Current Sinking Mode, VOUT = 0.9V)
–1 –3 –5 –7 –9
Load Current (Amps)
Efficiency (%)
V
IN
= 3.3V
V
IN
= 5V
$$27
%FFICIENCYVS,OAD#URRENT#URRENT3OURCING-ODE6/546
,OAD#URRENT!MPS
%FFICIENCY
6
).
6
6
).
6
89
87
85
83
81
79
77
75
DDR-9-W3
Efficiency vs. Load Current (Current Sinking Mode, VOUT = 1.25V)
–1 –3 –5 –7 –9
Load Current (Amps)
Efficiency (%)
V
IN
= 3.3V
V
IN
= 5V
MDC_DDR Series.B03 Page 5 of 5
DDR Series
9A Active Power Power Terminator
for DDR Memories
www.murata-ps.com/support
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifi cations are subject to change without
notice. © 2012 Murata Power Solutions, Inc.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfi eld, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(3.3VIN, 0.9VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(5VIN, 0.9VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(3.3VIN, 1.25VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
300 lfm
0 lfm Airflow
–40 0 15 25 35 45 55 65 75 85 95 105 115 125
DDR-9-W3 Maximum Current Temperature Derating
(5VIN, 1.25VOUT, Current Sourcing Mode)
Output Current (Amps)
Ambient Temperature (°C)
10
9
8
7
6
5
4
3
2
1
0
100 lfm
400 lfm
200 lfm
0 lfm Airflow
300 lfm
Typical Performance Curves
