Figure 1. OKL-T/3-W12
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifi cations.
The OKL-T/3-W12 series are miniature
non -isolated Point-of-Load (PoL) DC/DC power
converters for embedded applications. Featuring
inspectable Land Grid Array (iLGA) format, the
OKL-T/3-W12 measures only 0.48 x 0.48 x 0.244
inches max. (12.2 x 12.2 x 6.2 mm max.).
The wide input range is 4.5 to 14 Volts DC.
The maximum output current is 3 Amps. Based
on fi xed-frequency synchronous buck converter
switching topology, the high power conversion
effi cient Point of Load (PoL) module features
programmable output voltage and On/Off control.
These converters also include under voltage lock
out (UVLO), output short circuit protection, and
over-current protections.
An optional sequence/tracking feature on
OKL2-T/3-W12 models allows power sequencing of
PoL’s. These units are certifi ed to all standard UL/EN/
IEC 60950-1 safety certifi cations (2nd Edition) and
RoHS-6 hazardous substance compliance.
PRODUCT OVERVIEW
Connection Diagram
External
DC
Power
Source
F1 On/Off
Control
Common
Common
Sequence/Tracking
(OKL2 Models)
Power Good
Open = On
Closed = Off
+Vin +Vout
Trim
Sense
Controller
Reference and
Error Amplifier
t4XJUDIJOH
t'JMUFST
t$VSSFOU4FOTF
(Positive
On/Off)
FEATURES
■ iLGA inspectable Land Grid Array
■ 4.5-14Vdc input voltage range
■ Programmable output voltage from 0.591-5.5Vdc
■ Drives up to 200 µF ceramic capacitive loads
■ High power conversion effi ciency at 93%
■ Outstanding thermal derating performance
■ Short circuit and over current protection
■ On/Off control and Power Good signal
■ Optional Sequence/Tracking operation
(OKL2-T/3-W12 models)
■ Certifi ed to UL/EN/IEC 60950-1 safety, 2nd Edition
■ RoHS-6 hazardous substance compliance
Typical unit
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 1 of 18
www.murata-ps.com
www.murata-ps.com/support
For full details go to
www.murata-ps.com/rohs
　
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 2 of 18
www.murata-ps.com/support
Performance Specifi cations and Ordering Guide
ORDERING GUIDE
Model Number
Output Input Effi ciency On/Off
Logic
Seq/
Track
Package - Pinout P83
Vout
(Volts) ➀
Iout (Amps,
max.)
Power
(Watts)
R/N (mV p-p)
Max. ➃
Regulation (max.) Vin nom.
(Volts)
Range
(Volts)
Iin, no load
(mA) ➃
Iin, full load
(Amps) ➁
Case C83
inches (mm)
Line Load Min. Typ.
OKL-T/3-W12P-C 0.591-5.5 3 15.0 37 ±0.25% ±0.25% 12 4.5-14 20 1.34 91% 93% Pos. no 0.48x0.48x0.244 max
12.2x12.2x6.2 max
OKL-T/3-W12N-C 0.591-5.5 3 15.0 37 ±0.25% ±0.25% 12 4.5-14 20 1.34 91% 93% Neg. no 0.48x0.48x0.244 max
12.2x12.2x6.2 max
OKL2-T/3-W12P-C 0.591-5.5 3 15.0 37 ±0.25% ±0.25% 12 4.5-14 20 1.34 91% 93% Pos. yes 0.48x0.48x0.244 max
12.2x12.2x6.2 max
OKL2-T/3-W12N-C 0.591-5.5 3 15.0 37 ±0.25% ±0.25% 12 4.5-14 20 1.34 91% 93% Neg. yes 0.48x0.48x0.244 max
12.2x12.2x6.2 max
➀ The output range is limited by Vin. See detailed specs.
➁ All specifi cations are at nominal line voltage, Vout=nominal (5V for W12 models) and full load,
+25 deg.C. unless otherwise noted.
Output capacitors are 10 µF ceramic. Input cap is 22 µF. See detailed specifi cations.
I/O caps are necessary for our test equipment and may not be needed for your application.
➂ Use adequate ground plane and copper thickness adjacent to the converter.
Ripple and Noise (R/N) and no-load input current are shown at Vout=1V. See specs for details.
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:
The label contains three rows of information:
First row – Murata Power Solutions logo
Second row – Model number product code (see table)
Third row – Manufacturing date code and revision level
The manufacturing date code is four characters:
First character – Last digit of manufacturing year, example 2009
Second character – Month code (1 through 9 and O through D)
Third character – Day code (1 through 9 = 1 to 9, 10=O and
11 through 31 = A through Z)
Fourth character – Manufacturing information
Figure 2. Label Artwork Layout
XXXXXX Product code
Mfg.
date
code
Revision levelYMDX Rev.
Model Number Product Code
OKL-T/3-W12P-C L01103
OKL-T/3-W12N-C L00103
OKL2-T/3-W12P-C L21103
OKL2-T/3-W12N-C L20103
PART NUMBER STRUCTURE
Non-isolated PoL
Maximum Rated Output
Current in Amps
LGA Surface Mount
Sequence/tracking
Blank = Not installed
2 = Installed
Trimmable Output
Voltage Range
0.591-5.5Vdc
Input Voltage Range
4.5-14Vdc
On/Off Logic
P = Positive Logic
N = Negative Logic
OK L 2 -/ W12-T 3 C-
RoHS Hazardous
Substance Compliance
C = RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
N
Performance and Functional Specifi cations
See Note 1
Input
Input Voltage Range See Ordering Guide and Note 7.
Isolation Not isolated
Start-Up Voltage 4.2 V
Undervoltage Shutdown (see Note 15) 3.4 V
Overvoltage Shutdown None
Refl ected (Back) Ripple Current (Note 2) 49 mA pk-pk
Internal Input Filter Type Capacitive
Recommended External Fuse 4A
Reverse Polarity Protection None, install external fuse
Input Current:
Full Load Conditions See Ordering Guide
Inrush Transient 0.16 A2Sec.
Shutdown Mode (Off, UV, OT) 1 mA
Output in Short Circuit 5 mA
Low Line (Vin=Vmin) 2.24 A.
Remote On/Off Control (Note 5)
Negative Logic ON = Open pin or -0.2V to +0.3V. max.
OFF = +3.5V min. to +Vin max.
Positive Logic ON = Open pin (internally pulled up) or
+3.5V to +Vin max.
OFF = -0.3V to +0.4V. max. or ground
Current 1 mA max.
Tracking/Sequencing (optional) See technical note on page 16
Slew Rate 2 Volts per millisecond, max.
Tracking accuracy, rising input Vout = ±100 mV of Sequence In
Tracking accuracy, falling input Vout = ±100 mV of Sequence In
Output
Output Power 16.5W max.
Output Voltage Range See Ordering Guide
Minimum Loading No minimum load
Accuracy (50% load, untrimmed) ±1.5 % of Vnominal
Voltage Output Range (Note 13) See Ordering Guide
Overvoltage Protection (Note 16) None
Temperature Coeffi cient ±0.02% per °C of Vout range
Ripple/Noise (20 MHz bandwidth) See Ordering Guide and note 8
Line/Load Regulation See Ordering Guide and note 10
Effi ciency See Ordering Guide
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms 200 F
Cap-ESR >0.01 Ohms TBD
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up) 6 Amps
Short Circuit Mode
Short Circuit Current Output 10 mA
Protection Method Hiccup autorecovery upon overload
removal. (Note 17)
Short Circuit Duration Continuous, no damage
(output shorted to ground)
Prebias Startup Converter will start up if the external
output voltage is less than Vnominal.
Power Good output open drain confi guration, 5 mA sink max.
PGood TRUE (HI) (Vset -10%) < Vout < (Vset +10%)
PGood FALSE (LO) 0.0V < Vout < 0.4V. See App. note.
External pullup voltage +5V max., referred to -Vin
Dynamic Characteristics
Dynamic Load Response 200Sec max. to within ±2% of fi nal value
(50-100% load step, di/dt=1A/µSec) (Note 1)
Peak Deviation 250 mV
Start-Up Time 6 mSec for Vout=nominal (Vin On)
(Vin on or On/Off to Vout regulated) 6 mSec for Vout=nominal (Remote On/Off)
Switching Frequency 600 KHz
Environmental
Calculated MTBF (hours) OKL-T/3-W12 OKL2-T/3-W12
Telecordia method (4a) 10,011,000 9,227,000
Calculated MTBF (hours)
MIL-HDBK-217N2 method (4b) 5,549,000 4,860,000
Operating Temperature Range (Ambient, vertical mount)
See derating curves -40 to +85 °C. with derating (Note 9)
Storage Temperature Range -55 to +125 °C.
Thermal Protection/Shutdown Included in PWM
MSL Rating 2
Relative Humidity to 85%/+85 °C., non-condensing
Physical
Outline Dimensions See Mechanical Specifi cations
Weight 0.06 ounces (1.6 grams)
Safety Certifi ed to UL/cUL 60950-1, CSA-
C22.2 No. 60950-1, IEC/EN 60950-1,
2nd Edition
Restriction of Hazardous Substances RoHS-6 (does not claim EU RoHS exemption
7b–lead in solder)
Absolute Maximum Ratings
Input Voltage (Continuous or transient) 0 V. to +15 Volts max.
On/Off Control 0 V. min. to +Vin max.
Input Reverse Polarity Protection None, install external fuse
Output Current (Note 7) Current-limited. Devices can withstand a
sustained short circuit without damage.
The outputs are not intended to accept
appreciable reverse current.
Storage Temperature -55 to +125 ˚C.
Lead Temperature See soldering specifi cations
Absolute maximums are stress ratings. Exposure of devices to greater than any of
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 or recommended.
Specifi cation Notes:
(1) Specifi cations are typical at +25 °C, Vin=nominal (+12V.), Vout=nominal (+5V), full load, external caps and
natural convection unless otherwise indicated. Extended tests at full power must supply substantial forced
airfl ow.
All models are tested and specifi ed with external 10F 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 specifi ed 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.
(2) Input Back Ripple Current is tested and specifi ed over a 5 Hz to 20 MHz bandwidth. Input fi ltering is Cin=2 x
100 F ceramic, Cbus=1000 F electrolytic, Lbus=1 H.
(3) Note that Maximum Power Derating curves indicate an average current at nominal input voltage. At higher
temperatures and/or lower airfl ow, 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 fi xed
conditions, Tpcboard=+25 ˚C, full output load, natural air convection.
(4b) Mean Time Before Failure is calculated using the MIL-HDBK-217N2 method, ground benign, +25ºC., full
output load, natural convection.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 3 of 18
www.murata-ps.com/support
Specifi cation Notes, Cont.:
(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.
(6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting.
(7) Please observe the voltage input and output specifi cations in the Voltage Range Graph on page 16.
(8) Output noise may be further reduced by adding an external fi lter. At zero output current, the output may contain
low frequency components which exceed the ripple specifi cation. The output may be operated indefi nitely with
no load.
(9) All models are fully operational and meet published specifi cations, including “cold start” at –40˚ C.
(10) Regulation specifi cations 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 specifi cations when adjusting the output trim.
(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 Application Note.
(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.
(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.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 4 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
OKL-T/3-W12 Maximum Current Temperature Derating at Sea Level
(VIN = 12V, VOUT = 5V)
20 30 40 50 60 70 80 90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Natural convection
100 LFM
Output Current (Amps)
Ambient Temperature (ºC)
On/Off Enable Startup Delay (Vin=12V, Vout=5.0V, Iout=3A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=5.0V, Iout=3A, Cload=0, ScopeBW=20MHz)
Step Load Transient Response (Vin=12V, Vout=5.0V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=5.0V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
OKL2-T/3-W12 Effi ciency vs. Line Voltage and Load Current +25 ˚C
(Vout = 5V)
01 23
100
95
90
85
80
75
70
65
Load Current (Amps)
Efficiency (%)
VIN = 6V
VIN = 12V
VIN = 14V
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 5 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
On/Off Enable Startup Delay (Vin=12V, Vout=3.3V, Iout=3A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=3.3V, Iout=3A, Cload=0, ScopeBW=20MHz)
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=3.3V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
OKL-T/3-W12 Maximum Current Temperature Derating at Sea Level
(VIN = 12V, VOUT = 3.3V)
20 30 40 50 60 70 80 90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Natural convection
Output Current (Amps)
Ambient Temperature (ºC)
OKL2-T/3-W12 Effi ciency vs. Line Voltage and Load Current +25 ˚C
(Vout = 3.3V)
01 23
100
95
90
85
80
75
70
65
60
Load Current (Amps)
Efficiency (%)
VIN = 4.5V
VIN = 12V
VIN = 14V
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 6 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
On/Off Enable Startup Delay (Vin=12V, Vout=2.5V, Iout=3A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=2.5V, Iout=3A, Cload=0, ScopeBW=20MHz)
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=2.5V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
OKL-T/3-W12 Maximum Current Temperature Derating at Sea Level
(VIN = 12V, VOUT = 2.5V)
20 30 40 50 60 70 80 90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Natural convection
Output Current (Amps)
Ambient Temperature (ºC)
OKL2-T/3-W12 Effi ciency vs. Line Voltage and Load Current +25 ˚C
(Vout = 2.5V)
01 23
95
90
85
80
75
70
65
60
Load Current (Amps)
Efficiency (%)
VIN = 4.5V
VIN = 12V
VIN = 14V
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 7 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
Step Load Transient Response (Vin=12V, Vout=1.8V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=1.8V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Output Ripple and Noise (Vin=12V, Vout=1.8V, Iout=3A, Cload=0, ScopeBW=20MHz)
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 8 of 18
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OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
On/Off Enable Startup Delay (Vin=12V, Vout=1.2V, Iout=3A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Output Ripple and Noise (Vin=12V, Vout=1.2V, Iout=3A, Cload=0, ScopeBW=20MHz)
Step Load Transient Response (Vin=12V, Vout=1.2V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=1.2V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
OKL-T/3-W12 Maximum Current Temperature Derating at Sea Level
(VIN = 12V, VOUT = 1.2V)
20 30 40 50 60 70 80 90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Natural convection
Output Current (Amps)
Ambient Temperature (ºC)
OKL2-T/3-W12 Effi ciency vs. Line Voltage and Load Current +25 ˚C
(Vout = 1.2V)
01 23
95
90
85
80
75
70
65
60
55
Load Current (Amps)
Efficiency (%)
VIN = 4.5V
VIN = 12V
VIN = 14V
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 9 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
Output Ripple and Noise (Vin=12V, Vout=1.0V, Iout=3A, Cload=0, ScopeBW=20MHz)
Step Load Transient Response (Vin=12V, Vout=1.0V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=1.0V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 10 of 18
www.murata-ps.com/support
OKL-T/3-W12 PERFORMANCE DATA AND OSCILLOGRAMS
On/Off Enable Startup Delay (Vin=12V, Vout=0.591V, Iout=3A, Cload=0)
Trace 4=Enable In, Trace2=Vout
Step Load Transient Response (Vin=12V, Vout=0.591V, Cload=0, Iout=1.5A to 3A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Step Load Transient Response (Vin=12V, Vout=0.591V, Cload=0, Iout=3A to 1.5A)
Trace 2=Vout, 100 mV/div. Trace 4=Iout, 2.5A/div.
Output Ripple and Noise (Vin=12V, Vout=0.591V, Iout=3A, Cload=0, ScopeBW=20MHz)
OKL2-T/3-W12 Effi ciency vs. Line Voltage and Load Current +25 ˚C
(Vout = 0.591V)
01 23
90
85
80
75
70
65
60
55
50
45
40
Load Current (Amps)
Efficiency (%)
VIN = 4.5V
VIN = 12V
VIN = 14V
OKL-T/3-W12 Maximum Current Temperature Derating at Sea Level
(Vin = 12V, Vout = 0.591V)
20 30 40 50 60 70 80 90
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
Natural convection
Output Current (Amps)
Ambient Temperature (ºC)
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 11 of 18
www.murata-ps.com/support
MECHANICAL SPECIFICATIONS
INPUT/OUTPUT CONNECTIONS
Pin Function
1 On/Off Control*
2VIN
3 Ground
4VOUT
5 Sense
6 Trim
7 Ground
8 No Connection
9 Sequence/Tracking†
10 Power Good out
11 No Connection
12 No Connection
*The Remote On/Off can be provided with
either positive (P suffi x) or negative (N
suffi x) logic
† OKL2 Models
Third Angle Projection
Dimensions are in inches (mm shown for ref. only).
Components are shown for reference only.
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
0.330 (8.38)
0
0.060 (1.52)
0.150 (3.81)
0.240 (6.10)
0.240 (6.10)
0.420 (10.67)
0
0.060 (1.52)
0.195 (4.95)
0.375 (9.53)
0.150 (3.81)
0.375 (9.53)
0.420 (10.67)
Bottom View
Top View
Side View
Bottom View
ViewEnd
0.48
(12.19)
0.48
(12.19)
0.244
(6.2)
max.
0.043 (1.09)
PCB
THK
NOM.
9
VinGnd
Vout
On/Off
PGood
Seq
NCGnd
NC
Trim
NC
Sense 1
24
5
11
6
12
10
3
87
Recommended Footprint
-through the Board-
0.50
12.7
0.50
12.7 0.135
3.43
0.090
2.29
0.180
4.57
0.090
2.29
0.180
4.57
0.090
2.29
0.180
4.57
0.045
1.14
0.135
3.43
0.180
4.57
1.27
0.050
(14 PLS)
12.40
0.488
12.40
0.488
0.070-0.080 [1.78-2.03mm]
x
0.160-0.170 [4.06-4.32mm]
3 PLACES
0.040-0.050 [1.02-1.27mm]
SQUARE PAD (9 PLS)
10
8712
6
11
5
432
1
Sense
NC
Trim1
NC
Gnd
PG
NC
Vout1
Gnd
Vin
C
L
C
L
Seq
9
On/Off
Copper Pads
No
Exposed
Copper
Permitted
SOLDER PAD NOTES:
[1] To avoid incorrect contacts with exposed via’s and plated through holes on the bottom of the converter, do not have any
exposed copper around the unit aside from our recommended footprint. 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 specifi ed connections.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 12 of 18
www.murata-ps.com/support
Figure 3. OKL-T/3-W12 Mechanical Outline
L00103
YMDX Rev.
L00103
YMDX Rev.
L00103
YMDX Rev.
16.00±0.1
12.60±0.1
A-A’ SECTION
A’
B’
(7.0º)
12.60±0.1
B-B’ SECTION
(7.0º)
4.00±0.1
11.50±0.1 1.75±0.1
2.00±0.1 Round
Sprocket
Holes
Vacuum Pickup
Point in Center
7.40±0.1
0.40±0.05
ø1.50
+0.1
-0
24.00
+0.3
-0.1
AB
Pulling direction
Notes
1) The radius (R) is 0.3mm max.
2) Cumulative tolerance of 10 pitches of the sprocket hole is ±0.2mm.
Tape Detail
Reel Detail
A
Reel diameter 330.2
Inner diameter 101.6
End of modules
All dimensions are in millimeters.
Start of
modules
in pockets
Start of
cover tape
Start of
pocket tape
Hub diameter 13.00
C
B
TAPE AND REEL INFORMATION (MSL RATING 2)
Reel Information (400 units per reel)
Key Description Length (mm)
ATape trailer (no modules) 800 ±40
BPocket tape length before modules 200 min.
CCover tape length before pocket tape 240 ±40
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 13 of 18
www.murata-ps.com/support
Output Voltage Adustment
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 is recommended to have a ±0.5% accuracy (or better) with low
temperature coeffi cient, ±100 ppm/°C or better. Mount the resistor close to
the converter with very short leads or use a surface mount trim resistor.
In the tables below, the calculated resistance is given. Do not exceed the
specifi ed 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 capacitors to Trim.
OKL-T/3-W12
Output Voltage Calculated Rtrim (KΩ)
5.0 V. 1.34
3.3 V. 2.18
2.5 V. 3.1
2.0 V. 4.19
1.8 V. 4.88
1.5 V. 6.50
1.2 V. 9.70
1.0 V. 14.45
0.591 V. ∞ (open)
Resistor Trim Equation, OKL-T/3-W12 models:
TECHNICAL NOTES
Do not connect any additional components between the Vtrim pin and Vout
or between the Trim and Sense pins. Use only the specifi ed connections as
recommended per this data sheet.
Input Fusing
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.
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 Specifi cations). 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
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.
Start-Up Time
Assuming that the output current is set at the rated maximum, the Vin to
Vout Start-Up Time (see Specifi cations) 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
specifi ed accuracy band. Actual measured times will vary with input source
impedance, external input capacitance, input voltage slew rate and fi nal
value of the input voltage as it appears at the converter.
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
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
specifi ed accuracy band. The specifi cation assumes that the output is fully
loaded at maximum rated current. Similar conditions apply to the On to
Vout regulated specifi cation such as external load capacitance and soft
start circuitry.
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.
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 polymer type. Initial
suggested capacitor values are 10 to 22 µF, rated at twice the expected maxi-
mum input voltage. Make sure that the input terminals do not go below the
undervoltage shutdown voltage at all times. More input bulk capacitance may
be added in parallel (either electrolytic or tantalum) if needed.
Recommended Output Filtering
The converter will achieve its rated output ripple and noise with no
additional external capacitor. However, the user may install more external
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 10 to 47 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 slug-
gish or possibly introduce instability. Do not exceed the maximum rated
output capacitance listed in the specifi cations.
Input Ripple Current and Output Noise
All models in this converter series are tested and specifi ed for input
refl ected ripple current and output noise using designated external input/
output components, circuits and layout as shown in the fi gures 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 specifi c
converter model.
RTRIM (k) = _____________
VOUT – 0.591
5.91
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 14 of 18
www.murata-ps.com/support
Minimum Output Loading Requirements
All models regulate within specifi cation and are stable under no load to full
load conditions. Operation under no load might however slightly increase
output ripple and noise.
Thermal Shutdown
To prevent many over temperature problems and damage, these converters
include thermal shutdown circuitry. If environmental conditions cause the
temperature of the DC/DC’s 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. There is a
small amount of hysteresis to prevent rapid on/off cycling.
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.
Temperature Derating Curves
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 airfl ow measured in Linear Feet per Minute
(“LFM”). Note that these are AVERAGE measurements. The converter will
accept brief increases in current or reduced airfl ow as long as the average
is not exceeded.
Note that the temperatures are of the ambient airfl ow, not the converter
itself which is obviously running at higher temperature than the outside
air. Also note that very low fl ow rates (below about 25 LFM) are similar to
“natural convection”, that is, not using fan-forced airfl ow.
Murata Power Solutions makes Characterization measurements in a
closed cycle wind tunnel with calibrated airfl ow. We use both thermocou-
ples and an infrared camera system to observe thermal performance.
C
IN
V
IN
C
BUS
L
BUS
C
IN
= 2 x 100µF, ESR < 700mΩ @ 100kHz
C
BUS
= 1000µF, ESR < 100mΩ @ 100kHz
L
BUS
= 1µH
+INPUT
-INPUT
CURRENT
PROBE
TO
OSCILLOSCOPE
+
–
+
–
Figure 4. Measuring Input Ripple Current
C1
C1 = 1µF
C2 = 10µF
LOAD 2-3 INCHES (51-76mm) FROM MODULE
C2 RLOAD
+OUTPUT
-OUTPUT
SCOPE
Figure 5. Measuring Output Ripple and Noise (PARD)
CAUTION: These graphs are all collected at slightly above Sea Level
altitude. Be sure to reduce the derating for higher density altitude.
Power Good Output
The PGood signal is an open drain output requiring a user’s external pullup
resistor to +5V or less referred to -Vin. PGood indicates when the converter
has stabilized and the output is approximately within regulation. PGood is
TRUE (open drain, high impedance state) if the converter’s power output
voltage within about +/-10% of the setpoint. When PGood is FALSE (satu-
rated low impedance state, LOW), the output resides within about +0.4V or
less referred to -Vin, depending on the pullup current.
Note that PGood does not directly measure an output overcurrent condi-
tion. However, gross overcurrent or output short circuit will set PGood to
FALSE (less than +0.4V saturation, low impedance condition). Because of
the open drain design, several converters may connect their PGood’s in
parallel with a common external pullup resistor in a wired-OR method.
The following conditions will render PGood as FALSE (Low):
+Vout is greater than 10% error from Vset.
Softstart is active and not yet complete.
An input undervoltage is present at +Vin.
An output short circuit has occurred.
An over temperature (OT) condition has occurred.
At power up, before the converter has achieved stable regulation, PGood
approximates a forward-biased diode to ground.
CAUTION - PGood is connected directly to the PWM controller and a
small signal FET inside the PWM. Use electrostatic protection. The PWM
may be destroyed by inadvertant static discharge or excess current into
the PGood signal. Pull down current should be limited to 5 mA maximum
and the external pullup voltage should never exceed +5V referred to the
negative input, -Vin.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 15 of 18
www.murata-ps.com/support
http://www.murata-ps.com/data/apnotes/dcan-61.pdf
http://www.murata-ps.com/datasheet/?http://www.murata-ps.com/data/apnotes/dcan-61.pdf
Figure 6. Power Good Circuit
5mA max.
Window
Comparator
HI impedance (Open Drain) = Power Ok
LO impedance (Saturation) = Power Not Ok
Power
Output
–Vin Logic
Ground
Common
Power
Good
External
+Logic Supply
(+5V max.)
User’s External
Logic
Soldering Guidelines
Murata Power Solutions recommends the specifi cations below when installing these
converters. These specifi cations vary depending on the solder type. Exceeding these
specifi cations may cause damage to the product. Your production environment may differ
therefore please thoroughly review these guidelines with your process engineers.
0
50
100
150
200
250
0 30 60 90 120 150 180 210 240 270 300
Time (sec)
Temperature (°C)
Preheating Zone
240 sec max
Soaking Zone
120 sec max
Reflow Zone
time above 217° C
45-75 sec
Peak Temp.
235-260° C
<1.5° C/sec High trace = normal upper limit
Low trace = normal lower limit
Reflow Solder Operations for surface-mount products (SMT)
For Sn/Ag/Cu based solders:
Preheat Temperature Less than 1 ºC. per second
Time over Liquidus 45 to 75 seconds
Maximum Peak Temperature 260 ºC.
Cooling Rate Less than 3 ºC. per second
For Sn/Pb based solders:
Preheat Temperature Less than 1 ºC. per second
Time over Liquidus 60 to 75 seconds
Maximum Peak Temperature 235 ºC.
Cooling Rate Less than 3 ºC. per second
Recommended Lead-free Solder Refl ow Profi le
Output Voltage Sequencing
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.
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 fi nal 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.
For proper voltage sequencing, fi rst, 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
the voltage at the sequencing pin will be 50mV when the sequencing
signal is at zero.
Click here to view Application Note DCAN-61
R1 = ———— ohms,
Vin – 0.05
23500
Voltage Range Graph
Please observe the limits below for voltage input and output ranges. These
limits apply at all output currents.
0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Output Voltage (V)
0
2
4
6
8
10
12
14
16
Input Voltage (V)
Upper Limit
Lower Limit
Vin=14V / Vout=1V
Vin=4.5V / Vout=3.63V
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 16 of 18
www.murata-ps.com/support
Output Current Limiting
Current limiting inception is defi ned as the point at which full power falls
below the rated tolerance. See the Performance/Functional Specifi ca-
tions. Note particularly that the output current may briefl y 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.
Output Short Circuit Condition
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 mag-
netically coupled voltage used to develop PWM bias voltage will also drop,
thereby shutting down the PWM controller. Following a time-out period, the
PWM will restart, causing the output voltage to begin rising to its appropri-
ate value. If the short-circuit condition persists, another shutdown cycle
will initiate. This rapid on/off cycling is called “hiccup mode”. The hiccup
cycling reduces the average output current, thereby preventing excessive
internal temperatures and/or component damage.
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
The OKL Series power modules can be specifi ed with either a positive or nega-
tive logic type. See Figures 7 and 8 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.
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 fi gure 7. 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 20K ohms.
Negative—Units are enabled when the ON/Off is open or brought to
within a low voltage (see specifi cations) with respect to –Vin. The unit is off
when the ON/Off is pulled high with respect to –Vin (see specifi cations). The
On/Off circuitry is shown in fi gure 8. The On/Off pin should be pulled high
with an external pull-up resistor (20K ohms). 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
resulting on the unit being on.
Dynamic control of the On/Off function should be able to sink the speci-
fi ed signal current when brought low and withstand appropriate voltage
when brought high. Be aware too that there is a fi nite time in milliseconds
(see specifi cations) 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.
BOM Rp 20K
BOM Q1 Q SMT MOS P 30V
GND GND
+Vin +Vin
Rp
Q1
R1
E
PWM
OKL P Module
On/Off
Figure 7. On/Off Circuit Control for Using Positive On/Off Logic
BOM Rp 20K
BOM Q1 Q SMT MOS P 30V
GND GND
+Vin +Vin
Rp
Q1
Q3
E
GND
OKL N Module
On/Off
PWM
Figure 8. On/Off Circuit Control for Using Negative On/Off Logic
Output Capacitive Load
These converters do not require external capacitance added to achieve
rated specifi cations. 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 oscilla-
tion or instability.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 17 of 18
www.murata-ps.com/support
Figure 9. Vertical Wind Tunnel
IR Video
Camera
IR Transparent
optical window Variable
speed fan
Heating
element
Ambient
temperature
sensor
Airflow
collimator
Precision
low-rate
anemometer
3” below UUT
Unit under
test (UUT)
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
airfl ow and heat dissipation analysis of power products.
The system includes a precision low fl ow-rate anemometer,
variable speed fan, power supply input and load controls,
temperature gauges, and adjustable heating element.
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.
Both through-hole and surface mount converters are
soldered down to a host carrier board for realistic heat
absorption and spreading. Both longitudinal and transverse
airfl ow studies are possible by rotation of this carrier board
since there are often signifi cant differences in the heat
dissipation in the two airfl ow directions. The combination of
adjustable airfl ow, adjustable ambient heat, and adjustable
Input/Output currents and voltages mean that a very wide
range of measurement conditions can be studied.
The collimator reduces the amount of turbulence adjacent
to the UUT by minimizing airfl ow turbulence. Such turbu-
lence infl uences 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.
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.
OKL-T/3-W12 Series
Programmable Output 3-Amp iLGA SMT PoLs
MDC_OKL-T/3-W12 Series.A21 Page 18 of 18
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/