OKL2-T/20-W5N-C [MURATA]
民用设备,工业设备;
muRata 
OKL2-T/20-W5 Series
s
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
Typical unit
FEATURES
PRODUCT OVERVIEW
The OKL2-T/20-W5 series are non-isolated
The wide input range is 2.4 to 5.5Volts DC.
The maximum output current is 20Amps. Based
on fixed-frequency synchronous buck converter
switching topology, the high power conversion
efficient Point of Load (PoL) module features pro-
grammable output voltage and On/Off control.
These converters also include under voltage lock
iLGA inspectable Land Grid Array
point-of-Load(PoL) DC-DC power Converters for
embedded applications. The tiny form factor is
configured on a Land Grid Array (LGA) assembly
measuring only 1.3 x 0.53 x0.34 inches (33.02 x
13.46 x 8.75 mm). Applications include powering
CPU’s, datacom/telecom systems, distributed bus
2.4-5.5Vdc input voltage range
Programmable output voltage from 0.6-3.63Vdc
Drives 1000μF ceramic capacitive loads
High power conversion efficiency at 93%
Outstanding thermal derating performance
architectures (DBA), programmable logic and mixed out (UVLO), output short circuit protection, over-
voltage systems. current and over temperature protections.
Over temperature and over current protection
On/Off control
RoHS-6 hazardous substance compliance
Optional Sequence/Tracking operation
Connection Diagram
+Vin
+Vout
tꢀ4XJUDIJOH
tꢀ'JMUFST
F1
On/Off
Control
Controller
tꢀ$VSSFOUꢀ4FOTF
External
DC
Trim
Power
Source
Reference and
Error Amplifier
Open = On
Closed = Off
(Positive
On/Off)
Common
Common
4FRVFODFꢁ5SBDLJOH
Power Good
Figure 1. OKL2-T/20-W5
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
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MDC_OKL2-T/20-W5.B02 Page 1 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE
Output
R/N
Input
Dimensions
Inches (mm)
Efficiency (%)
Model Number
Regulation (max.)
Vin nom. Range Iin, no load Iin, full load
Vout Iout (Amps, Power
(mV p-p)
(Volts) ➀ max.) ➁ (Watts)
(Volts) (Volts) ➃ (mA) ➃ (Amps) ➁
Line
Load
Min.
Typ.
Max. ➃
OKL-T/20-W5P-C
OKL-T/20-W5N-C
OKL2-T/20-W5P-C
OKL2-T/20-W5N-C
Pos. no
Neg. no
Pos. yes
Neg yes
1.3 x 0.53 x 0.34
(33.02 x 13.46 x 8.75)
0.6-3.63
20
66
35
0.6% 0.3%
5
2.4-5.5
63
14.18
91.0 93.1
➀
➁
The output range is limited by Vin. See detailed specs.
➂
Use adequate ground plane and copper thickness adjacent to the converter.
All specifications are at nominal line voltage, Vout=nominal (3.3V) and full
load, +25°C. unless otherwise noted.
Ripple and Noise (R/N) and no-load input current are shown at Vout=1V.
See specs for details.
Output capacitors are are 2 x 47ꢀF. Input cap is 22 μF. See detailed
specifications. I/O caps are necessary for our test equipment and may not
be needed for your application.
PART NUMBER STRUCTURE
OK L 2 - T / 20 - W5 N - C
Okami Non-isolated PoL
iLGA Surface Mount
Sequence/tracking
RoHS Hazardous
Substance Compliance
C = RoHS-6 (does not claim EU RoHS exemption
Blank = Not Installed
2 = installed
7b – lead in solder)
Trimmable Output
Voltage Range
0.6 - 3.63Vdc
On/Off Logic
P = Positive Logic
N = Negative Logic
Maximum Rated Output
Current in Amps
Input Voltage Range
2.4 - 5.5Vdc
Product Label
Because of the small size of these products, the product label contains a
character-reduced code to indicate the model number and manufacturing date
code. Not all items on the label are always used. Please note that the label
differs from the product photograph. Here is the layout of the label:
Model Number
Product Code
L01020
OKL-T/20-W5P-C
OKL-T/20-W5N-C
OKL2-T/20-W5P-C
OKL2-T/20-W5N-C
L00020
L21020
L20020
The manufacturing date code is four characters:
XXXXXX
Product code
Revision level
Mfg.
date
code
First character – Last digit of manufacturing year, example 2009
Second character – Month code (1 through 9 = Jan-Sep;
O, N, D = Oct, Nov, Dec)
Third character – Day code (1 through 9 = 1 to 9, 10 = 0 and
11 through 31 = A through Z)
YMDX Rev.
Figure 2. Label Artwork Layout
The label contains two rows of information:
Fourth character – Manufacturing information
First row – Model number product code (see table)
Second row – Manufacturing date code and revision level
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MDC_OKL2-T/20-W5.B02 Page 2 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Output Power
Conditions (1)
Full power operation
Minimum
Typical/Nominal
Maximum
6
72.6
Units
Vdc
W
0
0
Current-limited, no damage,
short-circuit protected
Output Current
0
20
A
On/Off Control
Sequence Pin
Storage Temperature Range
5.5
Vin max
125
Vdc
Vdc
˚C
Vin = Zero (no power)
-55
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other
than those listed in the Performance/Functional Specifications Table is not implied or recommended.
INPUT
Operating voltage range (7)
Recommended External Fuse
Turn On/Start-up threshold
Undervoltage Shutdown
Internal Filter Type
See output voltage vs input voltage
Fast blow
2.4
5
5.5
34
2.15
2.07
Vdc
A
Vdc
Rising input voltage
1.95
1.8
2.05
1.92
C-TYPE
Input current
Full Load Conditions
Low Line
Inrush Transient
Short Circuit Input Current
No Load Input Current
No Load Input Current
Shut-Down Mode Input Current
Reflected (back) ripple current (2)
GENERAL and SAFETY
Vin = nominal (3.3Vo set)
Vin @ min, 3.3 Vout
14.18
15.72
TBD
50
63
59
14.72
16.36
A
A
A2-Sec.
mA
3.3Vout, Iout @ 0
1.2V, Iout @ 0
90
86
mA
1
TBD
mA
mA, pk-pk
Measured at input with specified filter
@ Vin nom, 3.63Vout
@ Vin nom, 3.3Vout
@ Vin min=4.5Vin, 3.3Vout
@Vin nom, 1.8Vout
91.5
91
91
84
80
93.6
93.1
93.3
88.4
84.2
EFFICIENCY (5Vin @ 20A load current)
%
@Vin nom, 1.2Vout
Certified to UL-60950-1, CSA-C22.2
No.60950-1, IEC/60950-1, 2nd edition
(pending)
Safety
Yes
Per Telcordia SR332, issue 1 class 3, ground
fixed, Tambient=+25˚C
Calculated MTBF (4a)
6,355,830
4,941,433
Hours
Hours
Calculated MTBF (4b)
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Per Mil-HDBK-217N2 Method
600
KHz
mS
mS
Power On to Vout regulated
Remote ON to to Vout regulated
50-100-50% load step, settling time to within
2% of Vout di/dt =1 A/μSec
6
6
Startup Time
Dynamic Load Response
50
μSec
mV
Dynamic Load Peak Deviation
FEATURES and OPTIONS
Remote On/Off Control (5)
“N” suffix
same as above
300
Negative Logic, ON state
Negative Logic, OFF state
Control Current
Pin open=ON
open collector/drain
Pin open=ON
-0.2
Vin-0.7
Vin-1.7
+Vin-max
3
V
V
mA
“P” suffix
Positive Logic, ON state
Positive Logic, OFF state
Control Current
+Vin-0.7V
-0.3
Vin-max
0.8
3
V
V
mA
open collector/drain
Tracking/Sequencing(optional)
Slew Rate
Tracking Accuracy
2
V/mS
mV
mV
Rising input (0.5V/ms)
Falling input(0.5V/ms)
150
100
Tracking Accuracy
Power Good Option
PGOOD, Open Drain Configuration, Sinking:
Vout window for PGOOD: True
Vout window for PGOOD: False
Remote Sense
-10%
10%
500
Vset
Vdc
mV
0.05
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MDC_OKL2-T/20-W5.B02 Page 3 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
FUNCTIONAL SPECIFICATIONS (CONT.)
OUTPUT
Total Output Power
Voltage
0
66
72.6
W
Nominal Output Voltage Range (13)
Setting Accuracy
Output Voltage Overshoot-Startup
Current
See trim formula
At 50% load
0.6
-1.5
3.63
1.5
3
Vdc
% of Vnom.
% Vo set
Output Current Range
Minimum Load
Current Limit Inception (6)
Short Circuit
0
20
No minimum load
33
20
A
A
98% of Vnom., after warmup
20.2
Hiccup technique, autorecovery within 1%
of Vout
Short Circuit Current (17)
0.02
A
Short Circuit Duration (remove short for
recovery)
Short circuit protection method
Regulation (10)
Output shorted to ground, no damage
Current limiting
Continuous
Total Regulation Band
Line Regulation
Load Regulation
-2.5
Vo set
2.5
0.6
0.3
100
100
100
100
% Vo set
%
%
Vin=min. to max. Vout=nom.
Iout=min. to max.
3.3Vo, 12Vin
40
35
35
2.5Vo, 12Vin
1.8Vo, 12Vin
0.6Vo, 7Vin
Ripple and Noise (8)
mV pk-pk
30
Temperature Coefficient
At all outputs
0.02
% of Vnom./°C
Low ESR; >0.001, <0.01 ohm
ESR > 0.01 ohm
94
1000
10000
ꢀF
ꢀF
Maximum Capacitive Loading (14)
MECHANICAL
Outline Dimensions
1.3X0.53X0.34
33.02x13.46x8.75
Inches
mm
Weight
0.2
5.4
Ounces
Grams
ENVIRONMENTAL
full power, all output voltages, see derating
curves
Operating Ambient Temperature Range (9)
-40
-55
85
˚C
Storage Temperature
Thermal Protection/Shutdown
RoHS rating
Vin = Zero (no power)
Measured in center
125
˚C
˚C
TBD
RoHS-6
Notes
(1) Specifications are typical at +25°C, Vin = nominal (+5V), Vout = nominal (+3.3V), full load, external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
airflow. All models are tested and specified with external 2×47ꢀF ceramic output capacitors and a 22 ꢀF external
input capacitor. All capacitors are low ESR types. These capacitors are necessary to accommodate our test
equipment and may not be required to achieve specified performance in your applications. However, Murata
Power Solutions recommends installation of these capacitors. All models are stable and regulate within spec
under no-load conditions.
low frequency components which exceed the ripple specification. The output may be operated indefinitely with
no load.
(9) All models are fully operational and meet published specifications, including “cold start” at –40˚ C.
(10) Regulation specifications describe the deviation as the line input voltage or output load current is varied from a
nominal midpoint value to either extreme.
(11) Other input or output voltage ranges will be reviewed under scheduled quantity special order.
(12) Maximum PC board temperature is measured with the sensor in the center of the converter.
(13) Do not exceed maximum power specifications when adjusting the output trim.
(2) Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin = 2 x
100 ꢀF ceramic, Cbus = 1000 ꢀF electrolytic, Lbus = 1 ꢀH.
(14) The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of the external
output capacitor and, to a lesser extent, the distance and series impedance to the load. Larger caps will reduce
output noise but may change the transient response. Newer ceramic caps with very low ESR may require lower
capacitor values to avoid instability. Thoroughly test your capacitors in the application. Please refer to the Output
Capacitive Load Technical Note.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airflow, the DC-DC converter will tolerate brief full current outputs if the total RMS
current over time does not exceed the Derating curve.
(4a) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed
conditions, Tpcboard = +25 ˚C, full output load, natural air convection.
(15) Do not allow the input voltage to degrade lower than the input undervoltage shutdown voltage at all times.
Otherwise, you risk having the converter turn off. The undervoltage shutdown is not latching and will attempt to
recover when the input is brought back into normal operating range.
(4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25oC., full output
load, natural convection.
(5) The On/Off Control Input should use either a switch or an open collector/open drain transistor referenced to
-Input Common. A logic gate may also be used by applying appropriate external voltages which do not exceed +Vin.
(16) The outputs are not intended to sink appreciable reverse current.
(17) “Hiccup” overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the
overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse
prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers
normal operation.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
(7) Please observe the voltage input and output specifications in the voltage range graph.
(8) Output noise may be further reduced by adding an external filter. At zero output current, the output may contain
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MDC_OKL2-T/20-W5.B02 Page 4 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
OKL2-T/20-W5 PERFORMANCE DATA AND OSCILLOGRAMS
Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 3.3V)
100
Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=3.3V)
22
20
18
16
14
12
10
8
95
VIN = 4.5V
VIN = 5V
VIN = 5.5V
90
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
85
6
80
75
4
2
0
20
30
40
50
60
70
80
90
0
4
8
12
16
20
Ambient Temperature (°C)
Load Current (Amps)
On/Off Enable Delay (Vin=5.0V, Vout=3.3V, Iout=20A, Cload=94μF) Trace2=Enable,
Trace1=Vout
Output Ripple and Noise (Vin=5.0V, Vout=3.3V, Iout=20A, Cload=94μF,
ScopeBW=20MHz)
Step Load Transient Response (Vin=5.0V, Vout=3.3V, Cload=94μF, Iout=6A to 12A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
Step Load Transient Response (Vin=5.0V, Vout=3.3V, Cload=94μF, Iout=20A to 10A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
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MDC_OKL2-T/20-W5.B02 Page 5 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
OKL2-T/20-W5 PERFORMANCE DATA AND OSCILLOGRAMS
Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 2.5V)
100
Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=2.5V)
22
20
18
16
14
12
10
8
95
VIN = 3.3V
VIN = 5V
VIN = 5.5V
90
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
85
6
80
75
4
2
0
20
30
40
50
60
70
80
90
0
4
8
12
16
20
Ambient Temperature (°C)
Load Current (Amps)
On/Off Enable Delay (Vin=5.0V, Vout=2.5V, Iout=20A, Cload=94μF) Trace2=Enable,
Trace1=Vout
Output Ripple and Noise (Vin=5.0V, Vout=2.5V, Iout=20A, Cload=94μF,
ScopeBW=20MHz)
Step Load Transient Response (Vin=5.0V, Vout=2.5V, Cload=94μF, Iout=6A to 12A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
Step Load Transient Response (Vin=5.0V, Vout=2.5V, Cload=94μF, Iout=20A to 10A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
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MDC_OKL2-T/20-W5.B02 Page 6 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
OKL2-T/20-W5 PERFORMANCE DATA AND OSCILLOGRAMS
Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 1.8V)
100
Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=1.8V)
22
20
18
16
14
12
10
8
95
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
90
VIN = 2.8V
VIN = 3.3V
VIN = 5.5V
85
6
80
75
4
2
0
20
30
40
50
60
70
80
90
0
4
8
12
16
20
Ambient Temperature (°C)
Load Current (Amps)
On/Off Enable Delay (Vin=5.0V, Vout=1.8V, Iout=20A, Cload=94μF) Trace2=Enable,
Trace1=Vout
Output Ripple and Noise (Vin=5.0V, Vout=1.8V, Iout=20A, Cload=94μF,
ScopeBW=20MHz)
Step Load Transient Response (Vin=5.0V, Vout=1.2V, Cload=94μF, Iout=6A to 12A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
Step Load Transient Response (Vin=5.0V, Vout=1.2V, Cload=94μF, Iout=20A to 10A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
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MDC_OKL2-T/20-W5.B02 Page 7 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
OKL2-T/20-W5 PERFORMANCE DATA AND OSCILLOGRAMS
Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 1.2V)
95
Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=1.2V)
22
20
18
16
14
12
10
8
90
85
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
V
V
V
IN = 2.4V
IN = 3.3V
IN = 5.5V
80
75
70
6
4
2
0
20
30
40
50
60
70
80
90
0
4
8
12
16
20
Ambient Temperature (°C)
Load Current (Amps)
On/Off Enable Delay (Vin=12V, Vout=1.2V, Iout=20A, Cload=94μF) Trace2=Enable,
Trace1=Vout
Output Ripple and Noise (Vin=12V, Vout=1.2V, Iout=20A, Cload=94μF,
ScopeBW=20MHz)
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=94μF, Iout=6A to 12A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
Step Load Transient Response (Vin=5V, Vout=1.2V, Cload=94μF, Iout=20A to 10A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
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MDC_OKL2-T/20-W5.B02 Page 8 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
OKL2-T/20-W5 PERFORMANCE DATA AND OSCILLOGRAMS
Efficiency vs. Line Voltage and Load Current @Ta = +25 °C (Vout = 0.6V)
90
Maximum Current Temperature Derating at Sea Level (Vin=5V, Vout=0.6V)
22
20
18
16
14
12
10
8
85
80
75
Natural Convection
0.5 m/s (100 LFM)
1.0 m/s (200 LFM)
V
V
V
IN = 2.4V
IN = 3.3V
IN = 5.5V
6
4
70
65
2
0
20
30
40
50
60
70
80
90
0
4
8
12
16
20
Ambient Temperature (°C)
Load Current (Amps)
On/Off Enable Delay (Vin=5V, Vout=0.6V, Iout=20A, Cload=94μF) Trace2=Enable,
Trace1=Vout
Output Ripple and Noise (Vin=5V, Vout=0.6V, Iout=20A, Cload=94μF,
ScopeBW=20MHz)
Step Load Transient Response (Vin=5V, Vout=0.6V, Cload=94μF, Iout=6A to 12A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
Step Load Transient Response (Vin=5V, Vout=0.6V, Cload=94μF, Iout=20A to 10A)
Trace 1=Vout, 200 mV/div, Trace 4=Iout, 10A/div.
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MDC_OKL2-T/20-W5.B02 Page 9 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
MECHANICAL SPECIFICATIONS
8.75
Max
SIDE VIEW
Figure 3. OKL2-T/20-W5 Mechanical Outline
8
1
1
8
33.02
31.80
7
6
24.26
19.43
7
6
5
4
L䠆䠆䠆䠆䠆
䐟䐠䐡䐢
1.78×3.10×10PLACES
9
5
4
3
14.60
9.78
9
4.95
3
1.90
Y
1
0
2
2
10
X
0
TOP VIEW
BOTTOM VIEW
UNIT[mm]
[Tolerances 0.25mm]
INPUT/OUTPUT CONNECTIONS
Pin
1
2
Function
On/Off Control*
VIN
3
4
Sequence/Tracking
Ground
5
VOUT
Dimensions are in inches (mm shown for ref. only).
6
Trim
Third Angle Projection
7
8
9
+Sense (VOUT)
-Sense (Ground)
N.C.
10
N.C.
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1˚
*The Remote On/Off can be provided with
either positive (P suffix) or negative (N suffix)
logic.
Components are shown for reference only.
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MDC_OKL2-T/20-W5.B02 Page 10 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
RECOMMENDED LAYOUT
TOP VIEW
Unit:mm
1.22
7.54
4.83
4.83
4.82
4.83
4.95
8 PLACES
7
6
5
4
3
(B)
(B)
(B)
(B)
(B)
(B)
10
(A)
(A)
8
(B)
2
9
(B)
1
2 PLACES
1.90
Product outline
SOLDER PAD NOTES:
[1] To avoid incorrect contacts with exposed vias and plated through holes on the bottom of the
converter, do not have any exposed copper in the center area of the host PC board (see drawing).
Except for connections to the pads, keep all external circuits away from the board edges.
[2] Do not connect any additional components between the Trim pin and Vout or between the Trim
and Sense pins. Use only the specified connections.
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Tolerances (unless otherwise specified):
.XX 0.02 (0.5)
.XXX 0.010 (0.25)
Angles 1˚
Components are shown for reference only.
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MDC_OKL2-T/20-W5.B02 Page 11 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
TAPE AND REEL INFORMATION (MSL RATING 2)
Tape Detail
Vacuum Pickup
Point in Center
Pulling direction
A-A' SECTION
Reel Detail
Reel Information (200 units per reel)
Key Description
Length (mm)
A
B
C
Tape trailer (no modules)
240 40
Pocket tape length before modules
Cover tape length before pocket tape
240 60
240 40
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MDC_OKL2-T/20-W5.B02 Page 12 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
TECHNICAL NOTES
Output Voltage Adustment
capacitor inputs), the converter shuts off and then restarts as the external
capacitor recharges. Such situations could oscillate. To prevent this, make
sure the operating input voltage is well above the UV Shutdown voltage AT
ALL TIMES.
The output voltage may be adjusted over a limited range by connecting an
external trim resistor (Rtrim) between the Trim pin and Ground. The Rtrim
resistor must be a 1/10 Watt precision metal film type, 0.5% accuracy or
better with low temperature coefficient, 100 ppm/degC. or better. Mount
the resistor close to the converter with very short leads or use a surface
mount trim resistor.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to
Vout Start-Up Time (see Specifications) is the time interval between the
point when the ramping input voltage crosses the Start-Up Threshold and
the fully loaded regulated output voltage enters and remains within its
specified accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, input voltage slew rate and final
value of the input voltage as it appears at the converter.
In the table below, the calculated resistance is given. Do not exceed the
specified limits of the output voltage or the converter’s maximum power
rating when applying these resistors. Also, avoid high noise at the Trim
input. However, to prevent instability, you should never connect any capaci-
tors to Trim.
OKL2-T/20-W5
These converters include a soft start circuit to moderate the duty cycle of
its PWM controller at power up, thereby limiting the input inrush current.
The On/Off Remote Control interval from On command to Vout regulated
Output Voltage
3.3 V
Calculated Rtrim (KΩ)
0.444
0.63
2.5 V
assumes that the converter already has its input voltage stabilized above
the Start-Up Threshold before the On command. The interval is measured
from the On command until the output enters and remains within its
specified accuracy band. The specification assumes that the output is fully
loaded at maximum rated current. Similar conditions apply to the On to Vout
regulated specification such as external load capacitance and soft start
circuitry.
1.8 V
1.00
1.5 V
1.33
1.2 V
2.00
1.0 V
3.00
0.6 V
∞ (open)
Resistor Trim Equation, OKL2-T/20-W5 models:
Recommended Input Filtering
The user must assure that the input source has low AC impedance to
provide dynamic stability and that the input supply has little or no inductive
content, including long distributed wiring to a remote power supply. The
converter will operate with no additional external capacitance if these
conditions are met.
1.2
VOUT – 0.6
________
RTRIM (kΩ) =
Input Fusing
For best performance, we recommend installing a low-ESR capacitor
immediately adjacent to the converter’s input terminals. The capacitor
should be a ceramic type such as the Murata GRM32 series or a poly-
mer type. Initial suggested capacitor values are 44 μF, rated at twice the
expected maximum input voltage. Make sure that the input terminals do
not go below the under voltage shutdown voltage at all times. More input
bulk capacitance may be added in parallel (either electrolytic or tantalum)
if needed.
Certain applications and/or safety agencies may require fuses at the inputs
of power conversion components. Fuses should also be used when there
is the possibility of sustained input voltage reversal which is not current
limited. For greatest safety, we recommend a fast blow fuse installed in the
ungrounded input supply line.
The installer must observe all relevant safety standards and regulations.
For safety agency approvals, install the converter in compliance with the
end-user safety standard.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no
additional external capacitor. However, the user may install more exter-
nal output capacitance to reduce the ripple even further or for improved
dynamic response. Again, use low-ESR ceramic (Murata GRM32 series)
or polymer capacitors. Initial values of 94 μF may be tried, either single or
multiple capacitors in parallel. Mount these close to the converter. Measure
the output ripple under your load conditions.
Use only as much capacitance as required to achieve your ripple and noise
objectives. Excessive capacitance can make step load recovery sluggish
or possibly introduce instability. Do not exceed the maximum rated output
capacitance listed in the specifications.
Input Under-Voltage Shutdown and Start-Up Threshold
Under normal start-up conditions, converters will not begin to regulate
properly until the ramping-up input voltage exceeds and remains at the
Start-Up Threshold Voltage (see Specifications). Once operating, convert-
ers will not turn off until the input voltage drops below the Under-Voltage
Shutdown Limit. Subsequent restart will not occur until the input voltage
rises again above the Start-Up Threshold. This built-in hysteresis prevents
any unstable on/off operation at a single input voltage.
Users should be aware however of input sources near the Under-Voltage
Shutdown whose voltage decays as input current is consumed (such as
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MDC_OKL2-T/20-W5.B02 Page 13 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
Input Ripple Current and Output Noise
Temperature Derating Curves
All models in this converter series are tested and specified for input
reflected ripple current and output noise using designated external input/
output components, circuits and layout as shown in the figures below. The
Cbus and Lbus components simulate a typical DC voltage bus. Please note
that the values of Cin, Lbus and Cbus will vary according to the specific
converter model.
The graphs in this data sheet illustrate typical operation under a variety of
conditions. The derating curves show the maximum continuous ambient air
temperature and decreasing maximum output current which is accept-
able under increasing forced airflow measured in Linear Feet per Minute
(“LFM”). Note that these are AVERAGE measurements. The converter will
accept brief increases in current or reduced airflow as long as the average
is not exceeded.
Note that the temperatures are of the ambient airflow, not the converter
itself which is obviously running at higher temperature than the outside
air. Also note that very low flow rates (below about 25 LFM) are similar to
“natural convection”, that is, not using fan-forced airflow. Murata makes
Characterization measurements in a closed cycle wind tunnel with cali-
brated airflow. We use both thermocouples and an infrared camera system
to observe thermal performance.
TO
CURRENT
PROBE
OSCILLOSCOPE
+VIN
-VIN
L
BUS
+
–
+
–
VIN
C
BUS
CIN
CAUTION: These graphs are all collected at slightly above Sea Level
altitude. Be sure to reduce the derating for higher density altitude.
C
IN = 2 x 100μF, ESR < 700mꢁ @ 100kHz
BUS = 1000μF, ESR < 100mꢁ @ 100kHz
Output Voltage Sequencing
C
The OKL modules include a sequencing feature that enables users to
implement various types of output voltage sequencing in their applications.
This is accomplished via an additional sequencing pin. When not using the
sequencing feature, either tie the sequence pin to Vin or leave it uncon-
nected.
LBUS = 1μH
Figure 4. Measuring Input Ripple Current
When an analog voltage is applied to the sequence pin, the output
voltage tracks this voltage until the output reaches the set-point voltage.
The final value of the sequence voltage must be set higher than the set-
point voltage of the module. The output voltage follows the voltage on the
sequence pin on a one-to-one volt basis. By connecting multiple modules
together, multiple modules can track their output voltages to the voltage
applied on the sequence pin.
+VOUT
-VOUT
RLOAD
SCOPE
Cext
For proper voltage sequencing, first, input voltage is applied to the
module. The On/Off pin of the module is left unconnected (or tied to GND
for negative logic modules or tied to Vin for positive logic modules) so that
the module is ON by default. After applying input voltage to the module,
a minimum 10msec delay is required before applying voltage on the
sequence pin. During this time, a voltage of 50mV ( 20 mV) is maintained
on the sequence pin. This delay gives the module enough time to complete
its internal powerup soft-start cycle. During the delay time, the sequence
pin should be held close to ground (nominally 50mV 20 mV). This is re-
quired to keep the internal opamp out of saturation thus preventing output
overshoot during the start of the sequencing ramp. By selecting resistor R1
according to the following equation
Figure 5. Measuring Output Ripple and Noise (PARD)
The capacitor Cext value is found on the electrical data page.
Minimum Output Loading Requirements
All models regulate within specification and are stable under no load to full
load conditions. Operation under no load might, however, slightly increase
output ripple and noise.
Thermal Shutdown
23500
R1 = ———— ohms,
Vin – 0.05
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC-DCs to rise above the Operating Temperature Range
up to the shutdown temperature, an on-board electronic temperature
sensor will power down the unit. When the temperature decreases below
the turn-on threshold, the converter will automatically restart.
the voltage at the sequencing pin will be 50mV when the sequencing
signal is at zero. See figure 6 for R1 connection for the sequencing signal to
the SEQ pin.
CAUTION: If you operate too close to the thermal limits, the converter
may shut down suddenly without warning. Be sure to thoroughly test your
application to avoid unplanned thermal shutdown.
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MDC_OKL2-T/20-W5.B02 Page 14 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
Output Current Limiting
mode”. The hiccup cycling reduces the average output current, thereby
preventing excessive internal temperatures and/or component damage. A
short circuit can be tolerated indefinitely.
Current limiting inception is defined as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifica-
tions. Note particularly that the output current may briefly rise above its
rated value in normal operation as long as the average output power is
not exceeded. This enhances reliability and continued operation of your
application. If the output current is too high, the converter will enter the
short circuit condition.
The “hiccup” system differs from older latching short circuit systems
because you do not have to power down the converter to make it restart.
The system will automatically restore operation as soon as the short circuit
condition is removed.
Remote On/Off Control
Output Short Circuit Condition
The OKL Series power modules can be specified with either a positive or nega-
tive logic type. See Figures 6 and 7 for On/Off circuit control. In the positive logic
on/off option the unit turns on during a logic high on the On/Off pin and turns off
during a logic low. In a negative logic on/off option, the unit turns off during logic
high and on during logic low. The On/Off signal should always be reference to
ground. For positive or negative option, leaving then On/Off pin disconnected
will turn the unit on when input voltage is present.
When a converter is in current-limit mode, the output voltage will drop
as the output current demand increases. If the output voltage drops too
low (approximately 98% of nominal output voltage for most models), the
magnetically coupled voltage used to develop primary side voltages will
also drop, thereby shutting down the PWM controller. Following a time-out
period, the PWM will restart, causing the output voltage to begin ramping
up to its appropriate value. If the short-circuit condition persists, another
shutdown cycle will initiate. This rapid on/off cycling is called “hiccup
Positive—Units are enabled when the on/off pin is left open or is pulled
high to +Vin. The On/Off circuit control is shown in figure 6. When the
external transistor Q1 is in the off state, the internal PWM enable pin is pull
high causing the unit to turn on. When Q1 is turn on, the On/Off pin is pulled
low and the units is off. Rp should be around 3KΩ.
OKL P Module
+Vin
Rp
+Vin
Negative—Units are enabled when the ON/Off is open or brought to
within a low voltage (see specifications) with respect to –Vin. The unit is off
when the ON/Off is pulled high with respect to –Vin (see specifications). The
On/Off circuitry is shown in figure 7. The On/Off pin should be pulled high
with an external pull-up resistor (3KΩ). When Q1 is in the off state, the On/
Off pin is pulled high, transistor Q3 is turn on and the unit is off. To turn on
the unit, Q1 is turn on, pulling the On/Off pin low and turning Q3 off result-
ing on the unit being on.
E
R1
On/Off
PWM
Q1
Dynamic control of the On/Off function should be able to sink the speci-
fied signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a finite time in milliseconds
(see specifications) between the time of On/Off Control activation and
stable, regulated output. This time will vary slightly with output load type
and current and input conditions.
GND
GND
BOM ꢀ Rp ꢀ 3KΩ
BOM ꢀ Q1 ꢀ Q SMT MOS P 30V
Figure 6. On/Off Circuit Control for Using Positive On/Off Logic
OKL N Module
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated specifications. Users should only consider adding capacitance to
reduce switching noise and/or to handle spike current load steps. Install
only enough capacitance to achieve noise objectives. Excess external
capacitance may cause regulation problems, degraded transient response
and possible oscillation or instability.
+Vin
Rp
+Vin
PWM
GND
E
On/Off
Q3
Q1
GND
GND
BOM ꢀ Rp ꢀ 3KΩ
BOM ꢀ Q1 ꢀ Q SMT MOS P 30V
Figure 7. On/Off Circuit Control for Using Negative On/Off Logic
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MDC_OKL2-T/20-W5.B02 Page 15 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
Voltage Range Graph
Please observe the limits below for voltage input and output ranges. These
limits apply at all output currents (Ta = 25°C).
6
5.5
5
4.5
4
3.5
3
2.5
2
1.5
Vin=2.4V / Vout=1.8V
1
0.5
0
Upper Limit
Lower Limit
0
0.5
1
1.5
2
2.5
3
3.5
4
Output Voltage (V)
Figure 8. Voltage Range Graph
Soldering Guidelines
Recommended Lead-free Solder Reflow Profile
Murata Power Solutions recommends the specifications below when installing these
converters. These specifications vary depending on the solder type. Exceeding these
Peak Temp.
235-260° C
250
specifications may cause damage to the product. Your production environment may differ
200
therefore please thoroughly review these guidelines with your process engineers.
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
Reflow Zone
150
Soaking Zone
time above 217° C
45-75 sec
120 sec max
Preheat Temperature
Time over Liquidus
Less than 1 ºC. per second
45 to 75 seconds
100
<1.5° C/sec
High trace = normal upper limit
Low trace = normal lower limit
Preheating Zone
240 sec max
50
0
Maximum Peak Temperature
Cooling Rate
260 ºC.
Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature
Time over Liquidus
0
30
60
90
120
150
Time (sec)
180
210
240
270
300
Less than 1 ºC. per second
60 to 75 seconds
CAUTION: Do not reflow the DC-DC converter as follows, because the
DC-DC converter may fall from the substrate during reflowing.
Maximum Peak Temperature
Cooling Rate
235 ºC.
Less than 3 ºC. per second
DC-DC Converter
Substrate
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MDC_OKL2-T/20-W5.B02 Page 16 of 17
OKL2-T/20-W5 Series
Programmable Output 20-Amp iLGA SMT PoL
DC-DC Converter Series
Vertical Wind Tunnel
Murata Power Solutions employs a computer controlled
custom-designed closed loop vertical wind tunnel, infrared
video camera system, and test instrumentation for accurate
airflow and heat dissipation analysis of power products.
The system includes a precision low flow-rate anemometer,
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
IR Transparent
optical window
Variable
speed fan
Unit under
test (UUT)
The IR camera monitors the thermal performance of the
Unit Under Test (UUT) under static steady-state conditions. A
special optical port is used which is transparent to infrared
wavelengths.
IR Video
Camera
Both through-hole and surface mount converters are
soldered down to a 10" x 10" host carrier board for realistic
heat absorption and spreading. Both longitudinal and trans-
verse airflow studies are possible by rotation of this carrier
board since there are often significant differences in the heat
dissipation in the two airflow directions. The combination of
adjustable airflow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
Heating
element
Precision
low-rate
anemometer
3” below UUT
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airflow turbulence. Such turbu-
lence influences the effective heat transfer characteristics
and gives false readings. Excess turbulence removes more
heat from some surfaces and less heat from others, possibly
causing uneven overheating.
Ambient
temperature
sensor
Airflow
collimator
Both sides of the UUT are studied since there are different
thermal gradients on each side. The adjustable heating element
and fan, built-in temperature gauges, and no-contact IR camera mean
that power supplies are tested in real-world conditions.
Figure 9. Vertical Wind Tunnel
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/
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.
© 2016 Murata Power Solutions, Inc.
www.murata-ps.com/support
MDC_OKL2-T/20-W5.B02 Page 17 of 17
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