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Single Output LSN-W3 Models
Performance/Functional Speci?cations
Typical @ T A = +25°C under nominal line voltage and full-load conditions unless noted. ?
Input
Non-Isolated, 3-5.5V IN , 0.75-3.3V OUT
16 Amp DC/DC Converters
Input Voltage Range
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition ?
Input Re?ected Ripple Current ? ?
Input Filter Type
Overvoltage Protection
Reverse-Polarity Protection
Undervoltage Shutdown
On/Off Control ? ?
3-5.5 Volts (5V nominal) ?
See Ordering Guide
0.02A 2 sec
8mA
60-110mA average (model dependent)
10-20mAp-p, model dependent
Capacitive
None
None. Install external fuse.
None
On = open or low (<0.4V max.)
Off = high (>2.5V to V IN max.), 1mA
? 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 ?ltering. See
I/O Filtering and Noise Reduction.
? MTBF’s are calculated using Telcordia SR-332(Bellcore), ground ?xed, T A = +25°C, full power,
natural convection, +67°C pcb temperature.
? Input Ripple Current is tested/speci?ed over a 5-20MHz bandwidth with an external 2 x 100μF input
capacitor and a simulated source impedance of 1000μF and 1μH. 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.
Absolute Maximum Ratings
V OUT Accuracy (50% load)
Temperature Coef?cient
Minimum Loading ?
Maximum Capacitive Load
Output
±1.5% ?
±0.02%/°C
No load
5000μF (electrolytic),
2000μF (0.02 ? ESR, OSCON)
Input Voltage:
Continuous or transient
On/Off Control (Pin 1)
Input Reverse-Polarity Protection
Output Overvoltage Protection
6 Volts (0.75, 1, 1.2, 1.5, 1.8, 2, 2.5 V OUT)
7 Volts (3.3V OUT and "T" models)
+V IN
None. Install external fuse.
None
V OUT Trim Range ±10%
Ripple/Noise (20MHz BW) ? ? ? See Ordering Guide
Total Accuracy 3% over line/load/temperature
Ef?ciency See Ordering Guide
Overcurrent Detection and Short-Circuit Protection: ?
Output Current
Storage Temperature
Lead Temperature
Current limited. Devices can withstand
sustained output short circuits without
damage.
–40 to +125°C
See Re?ow Solder Pro?le
Current-Limiting Detection Point 20-36 Amps (model dependent)
Short-Circuit Detection Point 98% of V OUT set
SC Protection Technique Hiccup with auto recovery
Short-Circuit Current 600mA average
Dynamic Characteristics
These 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 Speci?cations Table is not implied.
Transient Response (50% load step)
Start-Up Time: ?
V IN to V OUT and On/Off to V OUT
Switching Frequency
30-70μsec to ±2% of ?nal value
(model dependent)
7msec
300 ±50kHz
TECHNICAL NOTES
I/O Filtering and Noise Reduction
All models in the LSN W3 Series are tested and speci?ed with external 22μF
tantalum input and output capacitors. These capacitors are necessary to
Environmental
accommodate our test equipment and may not be required to achieve desired
Calculated MTBF ?
TBD
performance in your application. The LSN’s are designed with high-quality,
Operating Temperature: (Ambient) ?
Without Derating (Natural convection) –40 to +63/71°C (model dependent,
see Derating Curves)
With Derating See Derating Curves
high-performance internal I/O caps, and will operate within spec in most
applications with no additional external components.
In particular, the LSN’s input capacitors are speci?ed for low ESR and are
PC-Board Temperature
Thermal Shutdown
Dimensions
Pin Dimensions/Material
Weight
Flamability Rating
EMI
Safety
+100°C maximum
+115°C (110 to 125°C)
Physical
See Mechanical Speci?cations
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
0.28 ounces (7.8g)
UL94V-0
EN55022/CISPR22 (requires external ?lter)
UL/cUL/IEC/EN 60950-1, CSA-C22.2 No.234
fully rated to handle the units’ input ripple currents. Similarly, the internal
output capacitors are speci?ed for low ESR and full-range frequency response.
In critical applications, input/output ripple/noise may be further reduced using
?ltering 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-
? All models are tested/speci?ed with external 22μF tantalum input and output capacitors. These
capacitors are necessary to accommodate our test equipment and may not be required to achieve
ances can greatly affect system stability. Your speci?c system con?guration
may necessitate additional considerations.
speci?ed performance in your applications. All models are stable and regulate within spec under
no-load conditions.
? See Technical Notes and Performance Curves for details.
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MDC_LSN W3 Models.B01 Page 3 of 8
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