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S151-084-S151-00
www.murata-ps.com
DC/DC Converter
FEATURES
„
High output 15A
OBSOLETE PRODUCT
„
3.3V ±5%, 5/12V ±10% Input
„
Regulation ±0.4% line and load
„
Industry standard pin configuration
„
High efficiency to 91%
„
Remote Sense, Trim and Enable
This product is not fuse protected. User is responsible for providing system protection. Consult factory for application information.
„
Short Circuit protection
„
MTBF 2.9 million hours
„
Output voltage trimmable down to 0.6V using
the optional
„
voltage reference
„
Can source and sink output current
Specifications *
S151-03
S151-05
S151-12
3.3V ± 10%
5.0V ± 10%
Minimum 680μF
12V ± 10%
INPUT SPECIFICATIONS
Input voltage range
External input capacitor
Measured at +Vin pin
See also note on pg 9 and charts on pg 7
OUTPUT SPECIFICATIONS
0.8V
0.9V
Standard output voltages
Output current
Load regulation
Line regulation
External output capacitor
Short circuit protection
1.2V
1.5V
1.8V
15A
1.0V
1.2V
1.5V
1.8V
1.5V
1.8V
15A
15A**
±0.5%
±0.5%
>150μF with maxESR = 100mΩ
18A (at 70°C) to 32A (at -40°C)
Outputs 0.8V and 1.0V trimmable down to 0.6V using the on-board voltage reference (option 7 or F, see pg 2 and trimming equations on pg 8). Standard setpoint
accuracy varies from ±1.5% at the low end of the output voltage range, to ±3% at
the high end. (see chart on pg 2) Contact factory for tighter tolerances. See note on
pg 8 for trimming to different voltages.
200 LFM at 70°C (see also derating curves page 5-6)
0 to 15A load
Over specified input voltage range
See also note on pg 9
GENERAL SPECIFICATIONS
Enable ***
Efficiency
Isolation
Switching frequency
Approvals and Standards
Protection
Operating Temperature ****
Storage Temperature
Weight
MTBF
ON-open or low / OFF-high (max 15V)
90% typical
Non-isolated
See efficiency curves on pg 4
300kHz
UL 94V-0
Fusing
-40°C to 70°C
-40°C to 85°C
Fixed
Unit is not fused.
200 LFM at 70°C (see also derating curves)
Non-condensing
0.4 oz (11.3 gm)
2.7 million hours
Per RAC PRISM at 50°C ambient and 200 LFM
* All specifications are typical at nominal input, full load at 25°C unless otherwise stated.
** Max 10A for 5.0V output.
*** Pull below 0.4V and sink greater than 50 μA or leave open to enable the SIP; pull above 2V (do not exceed 15V) and source greater than 150 μA
to disable the SIP.
**** The output capacitors must meet the max ESR = 100 mΩ requirement over the operating temperature range.
For full details go to
www.murata-ps.com/rohs
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email: [email protected]
30 Apr 2010
MDC_S151-084-S151-00.B01 Page 1 of 10
S151-084-S151-00
DC/DC Converter
PART NUMBER CODING
S151 - 05 2 0 XYZ - B B
Model Number
Pin Length
B = .145 inch (Standard)
Consult Factory for Other Options
Input Voltage
03 = 3.3V
05 = 5V
12 = 12V
Feature Options
B = Remote Sense, Trim and Enable (Standard)
Consult Factory for Other Options
Mechanical Options
2 = Vertical Top Side Pins (Standard)
Consult Factory for Other Options
Output Voltage
XYZ = X.YZ Volts
Set Point Tolerance
0 = Factory Standard (See Initial Setpoint Tolerances)
INITIAL SETPOINT TOLERANCE
Initial Setpoint Tolerance
for 3.3V and 12V input SIPs
Initial Setpoint Tolerance
for 5V input SIPs
PIN ASSIGNMENT
CONNECTOR
J1
PIN
FUNCTION
1
2
3*
Remote Sense (Empty Optional)
4
VOUT
5
Ground
CONNECTOR
PIN
FUNCTION
VOUT
1
Ground
VOUT
2
VIN
J2
3
VIN
4*
Empty (Reference Voltage Optional)
5
Trim
6
Enable
* Pin is present only when feature is selected.
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 2 of 10
S151-084-S151-00
DC/DC Converter
MECHANICAL DIMENSIONS
2.77 (70.4) MAX
.050 (1.27)
2.650 (67.35)
.540(15.7)
.62
(13.72)
MAX
MAX
1 2 3 4 5
1 2 3
Topside
J1
J2
4 5 6
.155Length
Pin
MIN Option ± .02 (± .5)
NOTE 3
.100 (2.54)
1.800 TYP
(45.72)
1.400 (35.56)
.025 X .025
(0.64 X 0.64)
.40 (10.2)
Mechanical
Options 2
.435 MAX
.255 MAX
.110 MAX
.03
.03
Mech
Option
#2
(Standard)
1. Dimensions are in inches and (millimeters).
2. Tolerances: (unless otherwise noted)
Inches
.XX ± .020
.XXX ± .010
Pin:
± .002
Millimeters
.X ± 0.5
.XX ± 0.25
± 0.05
3. Pin is present only if feature is selected.
* Recommended Customer Hole Size 0.046 ±.003
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 3 of 10
S151-084-S151-00
DC/DC Converter
EFFICIENCY CURVES AT 25°C
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 4 of 10
S151-084-S151-00
DC/DC Converter
DERATING CURVES
No derating needed at 70°C with 200 LFM airflow or higher. *
* Extended operation at greater than rated current may degrade reliability.
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 5 of 10
S151-084-S151-00
DC/DC Converter
DERATING CURVES
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 6 of 10
S151-084-S151-00
DC/DC Converter
INPUT RIPPLE CURRENT
Approximate ripple current ratings required for input bulk capacitor
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 7 of 10
S151-084-S151-00
DC/DC Converter
RESISTOR TRIM EQUATIONS
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 8 of 10
S151-084-S151-00
DC/DC Converter
External Capacitance for SIP Products
All SIP products require external capacitance to be placed on the system board that the SIP will
be designed into. This application note is an attem pt to explain how to translate datasheet
inform ation and apply it to a system level board design.
Input Capacitance
Although input capacitance value is not critical, the input capacitors m ust be capable of storing
fairly large am ounts of energy. This m eans, for exam ple, sm all ceram ic capacitors would be
inappropriate. The prim ary criteria, though, for choosing the input capacitors is AC ripple
current rating. The SIP datasheet contains a chart showing ripple current vs. output current (o r
output power). The system designer determ ines the m axim um SIP output current required from
the SIP. Based on that num ber, the chart will show a corresponding ripple current rating the
designer needs to plan for when choosing input capacitors.
Exam ple using SIP S151-05 for 1.5 V output:
The designer knows the S151 output current will be m axim um 12.5A in his application.
The ripple current chart (5V input) shows a 7A rating required for the input capacitor.
Also known is that the capacitor the designer hopes to use has a ripple current rating o f
3A. Therefore, the designer m ust use three of the chosen capacitors in parallel for a
total ripple current capability of 9A. This will adequately cover the 7A need.
Output Capacitance
The only requirem ent for capacitance value is for basic circuit stability of the SIP. That value is
specified on the SIP datasheet— usually 150F. The other consideration for the output
capacitor is the total ESR (Equivalent Series Resistance). As with ripple current, every
capacitor has a specified ESR. W hen using m ultiple capacitors in parallel, this ESR is added
exactly like parallel resistors. Therefore, m ore capacitors m ean less ESR. The SIP datasheet
specifies a m axim um total ESR necessary for optim um SIP perform ance. The designer m ay
also choose to add m ore capacitance to reduce output ripple and noise.
Exam ple:
The datasheet specifies a m axim um ESR of 100m 7 for output capacitance. The system
designer wants to use a capacitor with a specified ESR of 130m 7. Since 130m 7 is
m ore than the needed 100m 7, two capacitors m ust be used in parallel for a total
effective ESR of 65m 7.
Generally, good, low ESR bulk capacitors are recom m ended for both input and output
capacitance so that fewer capacitors are needed since board real estate is usually an im portant
factor in today's designs.
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30 Apr 2010
MDC_S151-084-S151-00.B01 Page 9 of 10
S151-084-S151-00
DC/DC Converter
Impact on Output Voltage Ripple and Transient Response
If the custom er’s application req uires a very low output voltage ripple and / or very low
output voltage overshoot / undershoot during transients, then the guidelines previously
show n need to be exceeded and good layout practices becom e m andatory.
B y using four 330F O SC O N capacitors, each having E S R = 17m 7 , the output voltage
ripple can be decreased to 50m V pk-pk on a 1.2V output S IP . A lso during a transient load
condition (load current steps from 20% to 100% and back, at 2 A / sec) the output voltage
does not overshoot / undershoot m ore than 100m V .
W hen fast and deep transient loads are expected, the input capacitor becom es im portant as
w ell, especially if the SIP is far from its input voltage source. C apacitors having as m uch as
2000F and com bined ES R lower than 20m 7 m ig ht be needed.
P ractical results heavily depend on physical layout and specific load conditions. For critical
applications the custom er is encouraged to consult with the m anufacturer.
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
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. Specifications are subject to change without
notice.
© 2010 Murata Power Solutions, Inc.
www.murata-ps.com/locations
email: sa[email protected]
30 Apr 2010
MDC_S151-084-S151-00.B01 Page 10 of 10