Input

Input Voltage Range

10.8-13.2 Volts (12V nominal)

Input Current:

Normal Operating Conditions

See Ordering Guide

Inrush Transient

Standby/Off Mode

8mA

Output Short-Circuit Condition

40mA average

Input Reflected Ripple Current

100mAp-p

Input Filter Type

Capacitive (66μF)

Overvoltage Protection

None

Reverse-Polarity Protection

None

Undervoltage Shutdown

None

On/Off Control

On = open (internal pull-down)

Output

±1.25% maximum

Minimum Loading

No load

Maximum Capacitive Load

2000μF (low ESR, OSCON)

±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

17 (13-23.5) Amps

Short-Circuit Detection Point

SC Protection Technique

Hiccup with auto recovery

Short-Circuit Current

400mA average

Dynamic Characteristics

Transient Response (50% load step)

100μsec to ±2% of final value

Start-Up Time:

Switching Frequency:

1V/1.1V, 1.2V, 1.3 Models

105/125kHz ±10%

1.5V/1.8V, 2V Models

160/177kHz ±10%

2.5V, 3.3V, 5V Models

200kHz ±7.5%

Environmental

Calculated MTBF

Operating Temperature: (Ambient)

Without Derating (Natural convection)

–40 to +48/64°C (model dependent)

With Derating

See Derating Curves

Thermal Shutdown

+115°C

Physical

Dimensions

See Mechanical Specifications

Pin Dimensions/Material

0.03" (0.76mm) round copper alloy with

tin plate over nickel underplate

Weight

0.3 ounces (8.5g)

Flamability Rating

UL94V-0

Safety

UL/cUL/IEC/EN 60950, CSA-C22.2 No. 234

Performance/Functional Specifications

All models are tested/specified with external 22μF input/output capacitors.These caps

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.

See Technical Notes and Performance Curves for details.

The On/Off Control (pin 11) is designed to be driven with open-collector logic or the appli-

cation of appropriate voltages (referenced to Common, pins 5 and 6).

Output noise may be further reduced with the installation of additional external output

filtering. See I/O Filtering and Noise Reduction.

power, natural convection, +67°C pcb temperature.

TECHNICAL

NOTES

Input Voltage:

Continuous or transient

15 Volts

On/Off Control (Pin 11)

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 (soldering, 10 sec.)

+300°C

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

Return Current Paths

The LSN D12 SIP’s are non-isolated DC/DC converters. Their two Common

pins (pins 5 and 6) are connected to each other internally (see Figure 1). To

the extent possible (with the intent of minimizing ground loops), input return

current should be directed through pin 6 (also referred to as –Input or Input

Return), and output return current should be directed through pin 5 (also

referred to as –Output or Output Return). Any on/off control signals applied to

pin 11 (On/Off Control) should be referenced to Common

(specifically pin 6).

I/O Filtering and Noise Reduction

All models in the LSN D12 Series are tested and specified with external

22μF 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 D12's are designed with

high-quality, high-performance internal I/O caps, and will operate within spec

in most applications with no additional external components.

In particular, the LSN D12'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. As shown in the Performance Curves, removal of the external

22μF tantalum output caps has minimal effect on output noise.

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 appropriate 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 impedances can greatly affect system stability. Your specific system

configuration may necessitate additional considerations.

Output ripple/noise (also referred to as periodic and random deviations or

PARD) may be reduced below specified limits with the installation of addi-

tional external output capacitors. Output capacitors function as true filter

LSN-10A D12 Models

www.murata-ps.com

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