www.murata-ps.com
PRODUCT OVERVIEW
The OKL-T/3-W12 series are miniature non-iso-
lated 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 fixed-frequency synchronous buck converter
switching topology, the high power conversion
OKL-T/3-W12 Series
Programmable Output 3-Amp
iLGA
SMT PoLs
Typical unit
efficient 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 meet all standard UL/EN/IEC
60950-1 safety certifications (2nd Edition) and RoHS-6
hazardous substance compliance.
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 efficiency 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)
Meets UL/EN/IEC 60950-1 safety, 2nd Edition
RoHS-6 hazardous substance compliance
Contents
Description, Connection Diagram, Photograph
Ordering Guide, Product Label
Mechanical Specifications, Input/Output Pinout
Detailed Electrical Specifications
Output Voltage Adjustment, Application Notes
Performance Data and Oscillograms
Tape and Reel Information
Page
1
2
3
4
5
8
15
■
■
Connection Diagram
+Vin
F1
+Vout
On/Off
Control
Sense
Controller
External
DC
Power
Source
Trim
Open = On
Closed = Off
(Positive
On/Off)
Common
Reference and
Error Amplifier
Common
Power Good
Figure 1. OKL-T/3-W12
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
Sequence/Tracking
(OKL2 Models)
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
13 May 2010
email: sales@murata-ps.com
MDC_OKL-T/3-W12 Series.A09
Page 1 of 15
OKL-T/3-W12 Series
Programmable Output 3-Amp
iLGA
SMT PoLs
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
Model Number
Input
Efficiency
Package - Pinout P83
On/Off Seq/
Polarity Track
Case C83
inches (mm)
0.48x0.48x0.244 max
12.2x12.2x6.2 max
0.48x0.48x0.244 max
12.2x12.2x6.2 max
0.48x0.48x0.244 max
12.2x12.2x6.2 max
0.48x0.48x0.244 max
12.2x12.2x6.2 max
Vout
Iout (Amps, Power R/N (mV p-p) Regulation (max.) Vin nom. Range Iin, no load Iin, full load
(Volts)
➀
max.)
(Watts)
Max.
➃
(Volts) (Volts) (mA)
➃
(Amps)
➁
Min. Typ.
Line
Load
0.591-5.5
0.591-5.5
3
3
3
3
15.0
15.0
15.0
15.0
37
37
37
37
±0.25% ±0.25%
±0.25% ±0.25%
±0.25% ±0.25%
±0.25% ±0.25%
12
12
12
12
4.5-14
4.5-14
4.5-14
4.5-14
20
20
20
20
1.34
1.34
1.34
1.34
91% 93%
91% 93%
91% 93%
91% 93%
OKL-T/3-W12P-C
OKL-T/3-W12N-C
Pos.
Neg.
Pos.
Neg.
no
no
yes
yes
OKL2-T/3-W12P-C
0.591-5.5
OKL2-T/3-W12N-C
0.591-5.5
➀
➁
The output range is limited by Vin. See detailed specs.
All specifications 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 specifications.
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.
f
Ripple and Noise (R/N) and no-load input current are shown at Vout=1V. See specs for details.
PART NUMBER STRUCTURE
OK L 2
-
T
/
3
-
W12 N
-
C
Okami Non-isolated PoL
LGA Surface Mount
Sequence/tracking
Blank = Not installed
2 = Installed
Trimmable Output
Voltage Range
0.591-5.5Vdc
RoHS Hazardous
Substance Compliance
C
= RoHS-6 (does
not claim EU RoHS exemption
7b–lead in solder)
On/Off Polarity
P = Positive Polarity
N = Negative Polarity
Input Voltage Range
4.5-14Vdc
Maximum Rated Output
Current in Amps
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
OKL-T/3-W12P-C
OKL-T/3-W12N-C
OKL2-T/3-W12P-C
OKL2-T/3-W12N-C
Mfg.
date
code
XXXXXX
YMDX Rev.
Product code
Revision level
Product Code
L01103
L00103
L21103
L20103
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
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
www.murata-ps.com
13 May 2010
email: sales@murata-ps.com
MDC_OKL-T/3-W12 Series.A09
Page 2 of 15
OKL-T/3-W12 Series
Programmable Output 3-Amp
iLGA
SMT PoLs
MECHANICAL SPECIFICATIONS
Top View
0.48
(12.19)
0.043 (1.09)
NOM. PCB
THK
INPUT/OUTPUT CONNECTIONS
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Function
On/Off Control*
V
IN
Ground
V
OUT
Sense
Trim
Ground
No Connection
Sequence/Tracking
†
Power Good out
No Connection
No Connection
Bottom View
0.48
(12.19)
Side View
0.244
(6.2)
max.
NOTE:
This semicircle is connected to
Vout and should not make any
other connection.
*The Remote On/Off can be provided with
either positive (P suffix) or negative (N
suffix) polarity
†
OKL2 Models
End View
Recommended Footprint
-through the Board-
0.480 (12.19)
0.135
0.180
(3.43)
(4.57)
0.045
(1.14)
2
Vin
Vout
0.480 REF (12.19)
Gnd
Vin
On/Off
PGood
NC
Gnd
NC
Seq
9
12
0.150 (3.81)
7
0.240 (6.10)
8
0.420 (10.67)
0.330 (8.38)
9
Seq
NC Gnd
8
7
NC
12
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
Bottom View
0.060 (1.52)
0.195 (4.95)
0.375 (9.53)
0.070 x 0.160 x3
(1.77 x 4.07)
4
0
4
0.420 (10.67)
0.375 (9.53)
5
11
0.150 (3.81)
6
0.060 (1.52)
0
Trim
3
2
3
Gnd
Vout
Sense
NC
C
L
0.240 (6.10)
Sense
NC
1
10
C
L
1 On/Off
0.090
(2.29)
10
PG
0.180 (4.57)
0.135 (3.43)
5
11
6
0.180 (4.57)
Trim
0.090
(2.29)
0.180 0.090
(4.57) (2.29)
0.040 x 0.040 x9
(1.01 x 1.01)
Tolerances (unless otherwise specified):
.XX ± 0.02 (0.5)
.XXX ± 0.010 (0.25)
Angles ± 1˚
Figure 3. OKL-T/3-W12 Mechanical Outline
Components are shown for reference only.
www.murata-ps.com
13 May 2010
email: sales@murata-ps.com
MDC_OKL-T/3-W12 Series.A09
Page 3 of 15
OKL-T/3-W12 Series
Programmable Output 3-Amp
iLGA
SMT PoLs
Performance and Functional Specifications
See Note 1
Input
Peak Deviation
Start-Up Time
(Vin on or On/Off to Vout regulated)
Switching Frequency
250 mV
6 mSec for Vout=nominal (Vin On)
6 mSec for Vout=nominal (Remote On/Off)
600 KHz
Input Voltage Range
Isolation
Start-Up Voltage
Undervoltage Shutdown (see Note 15)
Overvoltage Shutdown
Reflected (Back) Ripple Current (Note 2)
Internal Input Filter Type
Recommended External Fuse
Reverse Polarity Protection
Input Current:
Full Load Conditions
Inrush Transient
Shutdown Mode (Off, UV, OT)
Output in Short Circuit
Low Line (Vin=Vmin)
Remote On/Off Control (Note 5)
Negative Logic
Positive Logic
See Ordering Guide and Note 7.
Not isolated
4.2 V
3.4 V
None
49 mA pk-pk
Capacitive
4A
None, install external fuse
See Ordering Guide
0.16 A
2
Sec.
1 mA
5 mA
2.24 A.
ON = Open pin or -0.2V to +0.3V. max.
OFF = +3.5V min. to +Vin max.
ON = Open pin (internally pulled up) or
+3.5V to +Vin max.
OFF = -0.3V to +0.4V. max. or ground
1 mA max.
2 Volts per millisecond, max.
Vout = ±100 mV of Sequence In
Vout = ±100 mV of Sequence In
Environmental
Calculated MTBF (hours)
Telecordia method (4a)
Calculated MTBF (hours)
MIL-HDBK-217N2 method (4b)
OKL-T/3-W12
10,011,000
5,549,000
OKL2-T/3-W12
9
,227,000
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
None
Relative Humidity
to 85%/+85
°
C., non-condensing
Physical
Outline Dimensions
Weight
Safety
See Mechanical Specifications
0.06 ounces (1.6 grams)
Meets UL/cUL 60950-1, CSA-
C22.2 No. 60950-1, IEC/EN 60950-1,
2nd Edition
RoHS-6 (does
not claim EU RoHS exemption
7b–lead in solder)
Restriction of Hazardous Substances
Current
Tracking/Sequencing (optional)
Slew Rate
Tracking accuracy, rising input
Tracking accuracy, falling input
Absolute Maximum Ratings
Input Voltage (Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current (Note 7)
Output
Output Power
Output Voltage Range
Minimum Loading
Accuracy (50% load, untrimmed)
Voltage Output Range (Note 13)
Overvoltage Protection (Note 16)
Temperature Coefficient
Ripple/Noise (20 MHz bandwidth)
Line/Load Regulation
Efficiency
Maximum Capacitive Loading (Note 14)
Cap-ESR=0.001 to 0.01 Ohms
Cap-ESR >0.01 Ohms
Current Limit Inception (Note 6)
(98% of Vout setting, after warm up)
Short Circuit Mode
Short Circuit Current Output
Protection Method
Short Circuit Duration
Prebias Startup
Power Good output
PGood TRUE (HI)
PGood FALSE (LO)
15.23W max.
See Ordering Guide
No minimum load
±1.5 % of Vnominal
See Ordering Guide
None
±0.02% per °C of Vout range
See Ordering Guide and note 8
See Ordering Guide and note 10
See Ordering Guide
200 μF
TBD
6 Amps
0 V. to +15 Volts max.
0 V. min. to +Vin max.
None, install external fuse
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 specifications
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 Specifications
Table is not implied nor recommended.
Specification Notes:
(1)
Specifications 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
airflow.
All models are tested and specified with external 10μF ceramic output capacitors and a 22 μF 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.
(2)
Input Back Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is Cin=2 x
100 μF ceramic, Cbus=1000 μF electrolytic, Lbus=1 μH.
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.
10 mA
Hiccup autorecovery upon overload
removal. (Note 17)
Continuous, no damage
(output shorted to ground)
Converter will start up if the external
output voltage is less than Vnominal.
open drain configuration, 10 mA sink
(Vset -10%) < Vout < (Vset +10%)
0.0V < Vout < 0.4V
(3)
(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.
(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.
Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected
setting.
(6)
Dynamic Characteristics
Dynamic Load Response
(50-100% load step, di/dt=1A/μSec)
200μSec max. to within ±2% of final value
(Note 1)
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MDC_OKL-T/3-W12 Series.A09
Page 4 of 15
OKL-T/3-W12 Series
Programmable Output 3-Amp
iLGA
SMT PoLs
Specification Notes, Cont.:
(7)
(8)
Please observe the voltage input and output specifications in the Voltage Range Graph on page 7.
Output noise may be further reduced by adding an external filter. At zero output current, the output may
contain low frequency components which exceed the ripple specification. The output may be operated
indefinitely with no load.
All models are fully operational and meet published specifications, including “cold start” at –40˚ C.
APPLICATION NOTES
(9)
(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.
(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.
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, i.e. IEC/EN/UL 60950-1.
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
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 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.
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
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.
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.
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 must be a 1/10 Watt precision metal film type, ±0.5% accuracy or
better with low temperature coefficient, ±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
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.
OKL-T/3-W12
Output Voltage
5.0 V.
3.3 V.
2.5 V.
2.0 V.
1.8 V.
1.5 V.
1.2 V.
1.0 V.
0.591 V.
Calculated Rtrim (KΩ)
1.34
2.18
3.1
4.19
4.88
6.50
9.70
14.45
∞ (open)
Resistor Trim Equation, OKL-T/3-W12 models:
5.91
R
TRIM
(k:) = _____________
V
OUT
– 0.591
www.murata-ps.com
13 May 2010
email: sales@murata-ps.com
MDC_OKL-T/3-W12 Series.A09
Page 5 of 15
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