www.murata-ps.com
PRODUCT OVERVIEW
The OKL-T/1-W12 series are non-isolated Point-
of-Load (PoL) DC/DC power converters for embed-
ded applications. Featuring inspectable Land Grid
Array (iLGA) format, the OKL-T/1-W12 measures
only 0.488 x 0.488 x 0.18 inches max. (12.4 x 12.4
x 4.57 mm max.).
The wide input range is 2.9 to 14 Volts DC. The
maximum output current is 1 Amp. Based on fixed-
frequency synchronous buck converter switching
topology, the high power conversion efficient Point
OKL-T/1-W12 Series
Programmable Output 1-Amp
iLGA
SMT PoLs
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 protec-
tions.
These units are designed to meet all standard UL/
EN/IEC 60950-1 safety certifications (2nd Edition) and
RoHS-6 hazardous substance compliance.
Typical unit
FEATURES
■
■
■
■
■
■
■
■
■
■
iLGA
inspectable Land Grid Array
2.9-14Vdc input voltage range
Programmable output voltage from 0.9-5.5Vdc
Drives up to 200 μF ceramic capacitive loads
High power conversion efficiency at 90%
Outstanding thermal derating performance
Short circuit and over current protection
On/Off control
UL/EN/IEC 60950-1 safety (pending)
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
5
6
9
16
Connection Diagram
+Vin
F1
+Vout
On/Off
Control
Controller
External
DC
Power
Source
Trim
Open = On
Closed = Off
(Positive
On/Off)
Common
Reference and
Error Amplifier
Common
Figure 1. OKL-T/1-W12
Note: Murata Power Solutions strongly recommends an external input fuse, F1.
See specifications.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
09 Feb 2011
email: sales@murata-ps.com
MDC_OKL-T/1-W12 Series.A01
Page 1 of 16
OKL-T/1-W12 Series
Programmable Output 1-Amp
iLGA
SMT PoLs
Performance Specifications and Ordering Guide
ORDERING GUIDE
Output
Model Number
Input
Efficiency
Typ.
Pos.
Neg.
Package - Pinout P83
On/Off
Polarity
Case C83
inches (mm)
0.488x0.488x0.18 max
12.4x12.4x4.57 max
0.488x0.488x0.18 max
12.4x12.4x4.57 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.
Line
Load
0.9-5.5
0.9-5.5
1
1
5
5
10
10
±0.25% ±0.25%
±0.25% ±0.25%
12
12
2.9-14
2.9-14
10
10
0.46
0.46
OKL-T/1-W12P-C
OKL-T/1-W12N-C
➀
➁
88.7% 90%
88.7% 90%
The output range is limited by Vin. (Vin x 0.8) ≥ Vout.
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
-
T
/
1
-
W12 N
-
C
Okami Non-isolated PoL
LGA Surface Mount
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
Trimmable Output
Voltage Range
0.591-5.5Vdc
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/1-W12P-C
OKL-T/1-W12N-C
Product Code
L01101
L00101
The manufacturing date code is four characters:
Mfg.
date
code
XXXXXX
YMDX Rev.
Product code
Revision level
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
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
www.murata-ps.com
09 Feb 2011
email: sales@murata-ps.com
MDC_OKL-T/1-W12 Series.A01
Page 2 of 16
OKL-T/1-W12 Series
Programmable Output 1-Amp
iLGA
SMT PoLs
Performance and Functional Specifications
See Note 1
Input
Environmental
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
2.45 V
2.4 V
None
49 mA pk-pk
Capacitive
2A
None, install external fuse
See Ordering Guide
0.16 A
2
Sec.
1 mA
5 mA
0.78 A.
ON = Open pin or -0.2V to +0.3V. max.
OFF = +1.2V min. to +Vin max.
ON = Open pin (internally pulled up) or
+1.2V to +Vin max.
OFF = -0.3V to +0.8V. max. or ground
0.250 mA
Calculated MTBF (hours)
Telecordia method (4a)
Calculated MTBF (hours)
MIL-HDBK-217N2 method (4b)
OKL-T/1-W12
TBC
TBC
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
0.024 ounces (0.67 grams)
Designed to meet 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
Absolute Maximum Ratings
Input Voltage (Continuous or transient)
On/Off Control
Input Reverse Polarity Protection
Output Current (Note 7)
Current
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
5.15W max.
See Ordering Guide
No minimum load
±3 % 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
1000 μF
2.4 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)
(3)
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.
Min. cap = 0 μF
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.
(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.
Dynamic Characteristics
(6)
Dynamic Load Response
(50-100% load step, di/dt=1A/μSec)
Peak Deviation
Start-Up Time
(Vin on or On/Off to Vout regulated)
Switching Frequency
200μSec max. to within ±2% of final value
(Note 1)
150 mV
3.4 mSec for Vout=nominal (Vin On)
3.5 mSec for Vout=nominal (Remote On/Off)
800 KHz
www.murata-ps.com
09 Feb 2011
email: sales@murata-ps.com
MDC_OKL-T/1-W12 Series.A01
Page 5 of 16
Embedded System
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