LSN-10A D3 Models
Single Output, Non-Isolated, 3.3VIN, 1-2.5VOUT, 10A, DC/DC's in SIP Packages
Typical Units
Features
■
Industry-standard SIP pinout
■
Shorter (2.0" vs. 2.5") package length
■
3.0-3.6V input range
■
1/1.2/1.25/1.5/1.8/2/2.5V outputs @ 10A
■
■
Non-isolated, fully synchronous,
300kHz, buck topology
Outstanding performance:
• ±1% setpoint accuracy
• Efficiencies to 94% @ 10 Amps
• Noise as low as 10mVp-p
• Stable no-load operation
• Trimmable output voltage
■
Remote on/off and sense pins
■
Thermal Shutdown
■
No derating to +71°C, natural convection
■
UL/IEC/EN60950 certified
■
DATEL’s new LSN D3 Series SIP’s (single-in-line packages) are
non-isolated DC/DC converters that accept a 3.3V input (3.0V to 3.6V
input range) and deliver 1V, 1.2V, 1.25V, 1.5V, 1.8V, 2V or 2.5V outputs at 10 Amps. LSN D3 SIP’s are designed to take on-board 3.3V
power and convert it, with the highest efficiency in the smallest space,
to any lower voltage required by today’s current-hungry DSP’s, ASIC’s
and CPLD’s.
The miniature size of LSN D3's makes them ideal for true point-of-use power
processing. Vertical-mount packages occupy a mere 0.7 square inches (440 sq.
mm), and they are available in industry-standard and Tyco-compatible pinout.
Horizontal-mount packages ("H" suffix) are only 0.34 inches (8.6mm) high.
The LSN's best-in-class power density is achieved with a fully synchronous,
fixed-frequency (300kHz), buck topology that also delivers: high efficiency (94% for
2.5VOUT models), low noise (10mVp-p typ.), tight line/load regulation (±0.1%/±0.25%
max.), quick step response (100µsec), stable no-load operation, and no output
reverse conduction.
The fully functional LSN’s feature output overcurrent detection, continuous shortcircuit protection, an output-voltage trim function, a remote on/off control pin
(pull high to disable), thermal shutdown, and a sense pin. High efficiency enables the
LSN D3's to deliver rated output currents of 10 Amps at ambient temperatures to
+71°C with no air flow (natural convection).
If your low-voltage, high-current requirements have made the use of inefficient
linear regulators impractical, take a look at one of DATEL’s easy-to-use, low-cost
LSN SIP’s. All devices are UL/IEC/EN60950 certified and EMC compliant. UL, CB,
HALT and EMC reports are available upon request.
EMC compliant
+OUTPUT
(1,2,4)
+INPUT
(7,8)
10.5Ω
330µF
44µF
47.1µF
470µF
+SENSE ➀
(3)
COMMON
(5)
COMMON
(6)
CURRENT
SENSE
VOLTAGE
BOOST
VCC
ON/OFF
CONTROL
(11)
Typical topology is shown
PWM
CONTROLLER
REFERENCE &
ERROR AMP
TRIM
(10)
Figure 1. Simplified Schematic
➀ For devices with the sense-pin removed ("B" suffix),
the feedback path is through the +Output pin and not
the +Sense pin.
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN10A-D3.B02 Page 1 of 14
LSN-10A D3 Models
Performance/Functional Specifications
Single Output, Non-Isolated, 3.3VIN, 1-2.5VOUT, 10A, DC/DC's in SIP Packages
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
Absolute Maximum Ratings
Input
Input Voltage Range
3.0 to 3.6 Volts (3.3V nominal)
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition ➁
Input Voltage:
Continuous or transient
6 Volts
See Ordering Guide
0.02A2sec
3mA
70mA average
On/Off Control (Pin 11)
+VIN
Input Reflected Ripple Current ➁
50mAp-p
None
Undervoltage Shutdown
None
–40 to +125°C
Lead Temperature (soldering, 10 sec.)
Reverse-Polarity Protection
Current limited. Devices can
withstand sustained output short
circuits without damage.
Storage Temperature
None
None
+300°C
Capacitive (374µF)
Overvoltage Protection
None
Output Overvoltage Protection
Output Current
Input Filter Type
Input Reverse-Polarity Protection
Sense Range
10% of VOUT
On/Off Control ➁ ➂
On = open (internal pulldown)
Off = +2.8V to +VIN (<3mA)
Output
T E C H N I C A L
VOUT Accuracy (50% load)
±1% maximum
Minimum Loading ➀
No load
Maximum Capacitive Load
10,000µF (electrolytic)
VOUT Trim Range ➁
±10%
Ripple/Noise (20MHz BW) ➀ ➁ ➃
See Ordering Guide
Temperature Coefficient
±0.02%/°C
Total Accuracy
3% over line/load/temperature
Efficiency ➁
See Ordering Guide
Overcurrent Detection and Short-Circuit Protection: ➁
Current-Limiting Detection Point
16 (12.5 to 22) Amps
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)
100µsec to ±2% of final value
Start-Up Time: ➁
VIN to VOUT
On/Off to VOUT
7msec
6msec
Switching Frequency
300kHz (+40kHz, –50kHz)
Environmental
MTBF ➄
2.1 million hours
Operating Temperature: (Ambient) ➁ –40 to +85°C with Derating
See Derating Curves
Thermal Shutdown
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.
+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 60950-1, CSA-C22.2 No. 234
➀ 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.
➁ See Technical Notes and Performance Curves for details.
➂ The On/Off Control (pin 11) is designed to be driven with open-collector logic or the application of appropriate voltages (referenced to Common, pins 5 and 6).
➃ Output noise may be further reduced with the installation of additional external output
filtering. See I/O Filtering and Noise Reduction.
➄ Calculated using the Telcordia (Bellcore) SR-332 Method 1, Case 3, ground fixed conditions,
TA = +25°C, full load, natural convection, +55°C component temperature.
www.murata-ps.com
N O T E S
Return Current Paths
The LSN D3 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 D3 Series are tested and specified with external 22µF
input and output capacitors. These capacitors are necessary to accommodate
our test equipment and may not be required to achieved desired performance
in your application. The LSN D3's are designed with high-quality, highperformance internal I/O caps, and will operate within spec in most applications with no additional external components.
In particular, the LSN D3'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
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
additional external output capacitors. Output capacitors function as true filter
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
MDC_LSN10A-D3.B02 Page 3 of 14
