MDC_LSN W3 Models.A01 Page 3 of 8
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www.murata-ps.com
Single Output LSN-W3 Models
Non-Isolated, 3-5.5Vin, 0.75-3.3Vout
16 Amp DC/DC Converters
Input
Input Voltage range
3-5.5 Volts (5V nominal)
Input Current:
Normal Operating Conditions
See Ordering Guide
Inrush Transient
0.02A2 sec
Standby/Off Mode
8mA
Output Short-Circuit Condition
60-110mA average (model dependent)
Input reflected ripple Current 10-20mAp-p, model dependent
Input Filter type
Capacitive
Overvoltage Protection
None
reverse-Polarity Protection
None
undervoltage Shutdown
None
On/Off Control
On = open or low (<0.4V max.)
Off = high (>2.5V to VIN max.), 1mA
Output
VOut accuracy (50% load)
±1.5%
temperature Coefficient
±0.02%/°C
minimum Loading
No load
maximum Capacitive Load
5000F (electrolytic),
2000F (0.02
ESR, OSCON)
VOut trim range
±10%
ripple/Noise (20MHz BW)
See Ordering Guide
total accuracy
3% over line/load/temperature
efficiency
See Ordering Guide
Overcurrent Detection and Short-Circuit Protection:
Current-Limiting Detection Point
20-36 Amps (model dependent)
Short-Circuit Detection Point
98% of VOUT set
SC Protection Technique
Hiccup with auto recovery
Short-Circuit Current
600mA average
Dynamic Characteristics
transient response (50% load step)
30-70sec to ±2% of final value
(model dependent)
Start-up time:
VIN to VOUT and On/Off to VOUT
7msec
Switching Frequency
300 ±50kHz
Environmental
Calculated mtbF
TBD
Operating temperature: (Ambient)
Without Derating (Natural convection) –40 to +63/71°C (model dependent,
see Derating Curves)
With Derating
See Derating Curves
PC-board temperature
+100°C maximum
thermal Shutdown
+115°C (110 to 125°C)
Physical
Dimensions
See Mechanical Specifications
Pin Dimensions/material
0.112"x 0.062" (2.84 x 1.57mm) rectangular
tellurium copper alloy with 100-300
microinches of tin electroplate over
100 microinches of nickel underplate
Weight
0.28 ounces (7.8g)
Flamability rating
UL94V-0
emI Conducted and Radiated
FCC Part 15, EN55022 Class B may
require external filter
Safety
UL/cUL/IEC/EN 60950-1, CSA-C22.2 No.234
All models are tested/specified with external 22F tantalum input and output capacitors.These
capacitors are necessary to accommodate our test equipment and may not be required to achieve
specified performance in your applications. All models are stable and regulate within spec under
no-load conditions.
Performance/Functional Specifications
Typical @ Ta = +25°C under nominal line voltage and full-load conditions unless noted.
Input Voltage:
Continuous or transient
6 Volts (0.75, 1, 1.2, 1.5, 1.8, 2, 2.5 VOUT)
7 Volts (3.3VOUT and "T" models)
On/Off Control (Pin 1)
+VIN
Input reverse-Polarity Protection
None
Output Overvoltage Protection
None
Output Current
Current limited. Devices can withstand
sustained output short circuits without
damage.
Storage temperature
–40 to +125°C
Lead temperature
See Reflow Solder Profile
These are stress ratings. Exposure of devices to 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.
Absolute Maximum Ratings
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All models in the LSN W3 Series are tested and specified with external 22F
tantalum input and output capacitors. These capacitors are necessary to
accommodate our test equipment and may not be required to achieve desired
performance in your application. The LSN’s are designed with high-quality,
high-performance internal I/O caps, and will operate within spec in most appli-
cations with no additional external components.
In particular, the LSN’s input capacitors are specified for low ESR and are
fully rated to handle the units’ input ripple currents. Similarly, the internal
output capacitors are specified for low ESR and full-range frequency response.
In critical applications, input/output ripple/noise may be further reduced using
filtering techniques, the simplest being the installation of external I/O caps.
External input capacitors serve primarily as energy-storage devices. They
minimize high-frequency variations in input voltage (usually caused by IR drops
in conductors leading to the DC/DC) as the switching converter draws pulses of
current. Input capacitors should be selected for bulk capacitance (at appropri-
ate frequencies), low ESR, and high rms-ripple-current ratings. The switching
nature of modern DC/DC’s requires that the dc input voltage source have low
ac impedance at the frequencies of interest. Highly inductive source imped-
ances can greatly affect system stability. Your specific system configuration
may necessitate additional considerations.
See Technical Notes and Performance Curves for details.
The On/Off Control is designed to be driven with open-collector logic or the application of appropriate
voltages (referenced to Common, pin 3). Applying a voltage to On/Off Control when no input voltage is
applied to the converter may cause permanent damage.
Output noise may be further reduced with the installation of additional external output filtering. See
I/O Filtering and Noise Reduction.
MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fixed, Ta = +25°C, full power,
natural convection, +67°C pcb temperature.
Input Ripple Current is tested/specified over a 5-20MHz bandwidth with an external 2 x 100F input
capacitor and a simulated source impedance of 1000F and 1H. See I/O Filtering, Input Ripple
Current, and Output Noise for details.
Setting accuracy for LSN-T/16-W3 is ±2%.
Input voltage must be 4.5V minimum for 3.3V output.