www.murata-ps.com

LSN2 Series

Non-isolated, DOSA-SIP, 6/10/16A

Selectable-Output DC/DC Converters

MDC_LSN2.B06 Page 4 of 15

(1)

All models are tested and specified with external 1 || 10μF ceramic/tantalum output capacitors and

a 22μF 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. All models are stable and regulate within spec under no-load conditions.

output voltage is +5V for D12 models and +3.3V for W3 models.

(2)

Input Back Ripple Current is tested and specified over a 5-20MHz bandwidth. Input filtering is

(3)

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.

(4)

Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3,

(5)

The On/Off Control may be driven with external logic or by applying appropriate external voltages

which are referenced to –Input Common. The On/Off Control Input should use either an open

: external pullup

(6)

Short circuit shutdown begins when the output voltage under increasing load degrades approxi-

mately 2% from the selected setting.

(7)

If Sense is connected remotely at the load, up to 0.5 Volts difference is allowed between the Sense

cause the converter to exceed maximum power dissipation.

(8)

Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction.

(9)

All models are fully operational and meet published specifications, including “cold start” at –40°C.

(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 are available under scheduled quantity special order.

(12)

Maximum PC board temperature is measured with the sensor in the center.

(13)

Do not exceed maximum power specifications when adjusting the output trim.

(14)

When Sequencing is not used, the Power Good output is TRUE at any time the output is within

approximately ±10% of the voltage set point. Power Good basically indicates if the converter is in

regulation. Power Good detects Over Temperature if the PWM has shut down due to OT. Power

Good does not directly detect Over Current.

If Sequencing is in progress, Power Good will falsely indicate TRUE (valid) before the output

reaches its setpoint. Ignore Power Good if Sequencing is in transition.

(15)

The maximum output capacitive loads depend on the the Equivalent Series Resistance (ESR) of

the external output capacitor.

(16)

Do not use Pre-bias startup and sequencing together. See Technical Notes below.

(17)

After short circuit shutdown, if the load is partially removed such that the load still exceeds the

overcurrent (OC) detection, the converter will remain in hiccup restart mode.

(18)

For best noise performance, leave the Track/Sequence pin OPEN when not used.

PERFORMANCE/FUNCTIONAL SPECIFICATION NOTES

ABSOLUTE MAXIMUM RATINGS

Input Voltage (Continuous or transient)

W3 models

+7 Volts

12V models

+15 Volts

On/Off Control

Input Reverse Polarity Protection

See Fuse section

Current-limited. Devices can

withstand sustained short circuit

without damage.

Storage Temperature

–55 to +125°C

Lead Temperature

See soldering guidelines

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 Specifications Table is not implied.

Soldering Guidelines

Murata Power Solutions recommends the specifications below when installing these

converters. These specifications vary depending on the solder type. Exceeding these

specifications may cause damage to the product. Be cautious when there is high atmo-

spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your

production environment may differ; therefore please thoroughly review these guidelines

with your process engineers.

Wave Solder Operations for through-hole mounted products (THMT)

For Sn/Ag/Cu based solders:

Maximum Preheat Temperature

115° C.

Maximum Pot Temperature

270° C.

Maximum Solder Dwell Time

7 seconds

For Sn/Pb based solders:

Maximum Preheat Temperature

105° C.

Maximum Pot Temperature

250° C.

Maximum Solder Dwell Time

6 seconds