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LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
PRODUCT OVERVIEW
Fabricated on a Single Inline Package (SIP) module, the LSS-T/10-W12 series is a miniature non-isolated Point-of-Load (POL) switching DC/DC power converter for embedded applications. The converter offers both tight regulation and high efficiency directly at the power usage site. Typically, no extra outside components are required. The module mounts vertically, occupying a tiny board footprint. The upright mounting improves cooling airflow. Suggested applications include powering CPU's, distributed bus architectures (DBA) with a master bus power supply, programmable logic and mixed voltage systems. Based on synchronous buck converter topology, the extraordinary efficiency means very low heat and little electrical noise. The ultra wide input range is 4.5 to 13.8 Volts. Additional features include quick transient response to step loads and stable no-load operation. A key feature is selectable output voltage either by precision resistor, trim pot or user's voltage input. The output range is adjustable from 0.6 to 6 Vdc. A wealth of protection features prevents damage to both the converter and outside circuits. Inputs are protected from undervoltage and outputs offer short circuit protection, overcurrent and excess temperature shut down. The unit is designed to meet all EMI/RFI certifications as well as HALT reliability. RoHS6 hazardous material compliance is specified as standard. All units are precision assembled in a highly automated computercontrolled surface mount facility with ISO-traceable manufacturing quality standards. Additional system functions include a remote On/Off control.
FEATURES
Vertical SIP-mount small footprint package Output from 0.6 to 6 Volts up to 51 Watts Ultra-wide 4.5 to 13.8 Vdc input range Outstanding thermal performance and derating Extensive self-protection and short circuit features with no output reverse conduction On/Off control and trim functions High efficiency up to 93% with no heatsink Fully protected against temperature and voltage limits Designed to meet UL/IEC/EN60950-1 safety approvals
Simplified Block Diagram
+VIN
+VOUT On/Off Control OT Common Signal Conditioning Typical topology is shown. Common PWM Controller
Trim
For full details go to www.murata-ps.com/rohs
Figure 1. LSS-T/10-W12 Series, 10 Amp Model
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MDC_MDC_LSS-T10-W12.A05 Page 1 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
Performance Specifications and Ordering Guide
ORDERING GUIDE Output VOUT (Volts) 0.591 - 6 R/N (mVp-p) Regulation (Max.) IOUT (Amps Power VIN Nom. max) (Watts) Typ. Max. Line Load (Volts) 10 60 45 75 0.2% 1.4% 12 Range (Volts) 4.5 - 13.8 Input IIN, no load (mA) 80 IIN, full load (Amps) 4.48 Efficiency Min. Typ. 91.5 93 Case C72 0.41 x 0.65 x 0.4 (10.4 x 16.5 x 10.2) Pinout P73 Package
Root Model LSS-T/10-W12
Dimensions are in inches (mm). All specifications are at nominal line voltage, VOUT = 5V and full load, +25 C unless otherwise noted. See detailed specifications. Output capacitors are 2 x 0.47 F ceramic. Input cap is 22 F.
I/O caps are necessary for our test equipment and may not be needed for your application. VIN must be 2V or higher than VOUT for 3.3 to 5V outputs.
PART NUMBER STRUCTURE
L SS - T / 10 - W12 - C
Output Configuration: L = Unipolar Low Voltage Non-Isolated SIP Output Voltage Range T = Trimmable, 0.6 - 6 Volts Maximum Rated Output Current in Amps RoHS Hazardous Substance Compliance C = RoHS6 (does not
claim EU RoHS exemption 7b-lead in solder)
Wide Input Voltage Range W12 = 4.5 - 13.8 Volts (10Amp)
MECHANICAL SPECIFICATIONS
0.41 (10.4) 0.205 REF (5.2) 0.24 MAX (6.1) 0.38 MAX (9.7)
INPUT/OUTPUT CONNECTIONS LSS-T/10-W12 Pin 1 2 3 4 5 Function P73 Enable On/Off +VIN Ground +VOUT Output Trim
0.65 (16.5)
0.12 (3.0) 0.06 REF THK (1.5) 0.05 (1.3) .032 (0.8) .002 OR .025 (0.6) .002 TYP
Dimensions are in inches (mm shown for ref. only).
Third Angle Projection
0.067 (1.7) 0.067 (1.7) 0.134 (3.4) 0.134 (3.4)
Tolerances (unless otherwise specified): .XX 0.02 (0.5) .XXX 0.010 (0.25) Angles 2 Components are shown for reference only.
Figure 2 . LSS-T/10-W12 Series Component locations are typical.
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MDC_MDC_LSS-T10-W12.A05 Page 2 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
Performance/Functional Specifications
All specifications are typical unless noted See Note 1.
Input
Dynamic Characteristics
Input Voltage Range Recommended External Fuse Isolation
See Ordering Guide. See note 19. 20 Amps Not isolated. The input and output commons internally connected. Start-up Voltage 4.2 Volts Undervoltage Shutdown 3.4 Volts Overvoltage Shutdown None Reflected (Back) Ripple Current 20 mA pk-pk Internal Input Filter Type Capacitive Reverse Polarity Protection1(Note 15) See fuse information Input Current: Full Load Conditions Inrush Transient Shutdown mode (Off, UV, OT) Output Short-Circuit No load, 5VOUT Low Line (VIN = Vmin, 5VOUT) Remote On/Off Control (Note 5) (LSS-T/10-W12, no suffix) Positive Logic Current See Ordering Guide 0.4 A2 sec 5 mA 60 mA 80 mA 11.95 Amps
Dynamic Load Response 20 Sec to within 2% of final value (0 to 50% load step, di/dt = 10A/Sec, no external caps) Turn-On Time 6 mSec for VOUT regulated Remote On/Off Time 6 mSec for VOUT regulated Switching Frequency 600 kHz
Environmental
Calculated MTBF (Note 4) Operating Temperature Range With Derating Storage Temperature Range Thermal Protection Shutdown Relative Humidity
TBC -45 to +85C (Note 9) See Derating Curves (Note 18) -55 to +125C +115C 85%/+85C
Physical
Outline Dimensions Weight Electromagnetic Interference (may require external filter)
See Mechanical Specifications 0.07 ounces (2 grams) Designed to meet FCC Part 15, EN55022, conducted and radiated Designed to meet UL/cUL 60950-1, CSA-C22.2 No. 60950-1, IEC/EN 60950-1
Absolute Maximum Ratings
On = +1.5 V to plus VIN max. or open pin Off = 0 to +0.2 V max. or ground pin 1 mA
Output
Safety
Minimum Loading (Note 7) Maximum Output Power Accuracy (50% load) Temperature Coefficient Ripple/Noise (20MHz bandwidth) Line Load Regulation (See Tech Notes) Efficiency Maximum Capacitive Loading Cap-ESR = 0.001 to 0.01 Cap-ESR > 0.01
No minimum load 51 Watts (Note 11) 1.5% of V setting See Ordering Guide 0.02% max. per C of VOUT range See Ordering Guide and Note 8 See Ordering Guide and Note 10 See Ordering Guide 5,000 F 10,000 F
Input Voltage Continuous or transient Output Power On/Off Control Input Reverse-Polarity Protection Output Current Storage Temperature Lead Temperature
15 Volts max. 51 Watts max. 0V. min to +VIN max. See Fuse section Current limited. Devices can withstand sustained output short circuits without damage. -40 to +125C See soldering guidelines
Voltage Adjustment Range (Notes 13, 19)
Current Limit Inception (98% of VOUT setting) (Note 12) 33 Amps (after warm up) Short Circuit Mode (Note 6, 12) Short Circuit Current Output 0.6 Amp Protection Method Hiccup autorecovery upon overload removal. (Note 16) Short Circuit Duration Continuous, no damage (output shorted to ground)
Absolute maximums 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 nor recommended. CAUTION: This product is not internally fused. To comply with safety agency certifications and to avoid injury to personnel or equipment, the user must supply an external fast-blow fuse to the input terminals. See fuse information.
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MDC_MDC_LSS-T10-W12.A05 Page 3 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
Notes
(1) All models are tested and specified with external 1||10 F ceramic/tantalum output capacitors and a 22 F 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. All specifications are typical unless noted. General conditions for Specifications are +25 C, VIN=nominal, VOUT=5V, full load. Adequate airflow must be supplied for extended testing under power. (2) Input Ripple Current is tested and specified over a 5 Hz to 20 MHz bandwidth. Input filtering is CIN=2 x 100 F, 100V tantalum, CBUS=1000 F, 100V electrolytic, LBUS=1 H. (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. All Derating curves are presented at sea level altitude. Be aware of reduced power dissipation with increasing density altitude. (4) Mean Time Before Failure is calculated using the Telcordia (Belcore) SR-332 Method 1, Case 3, ground fixed conditions, Tpcboard=+25C, full output load, natural air convection. (5) The On/Off Control is normally controlled by a switch or open collector or open drain transistor. But it may also be driven with external logic or by applying appropriate external voltages which are referenced to Input Common. (6) Short circuit shutdown begins when the output voltage degrades approximately 2% from the selected setting. (7) The outputs are not intended to sink appreciable reverse current. This may damage the outputs. (8) Output noise may be further reduced by adding an external filter. See I/O Filtering and Noise Reduction. Use only as much output filtering as needed and no more. Larger caps may slow transient response or degrade dynamic performance. Thoroughly test your system under full load, especially with low-ESR ceramic capacitors. (9) All models are fully operational and meet published specifications, including "cold start" at -40C. (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) For the LSS-T/10-W12, the maximum rated output power is 51 Watts (5.1 Volts and 10 Amps). Output adjustment up to 6 Volts must reduce current to remain within the 51 Watt output limit. (12) Output current limit and short circuit protection is non-latching. When the overcurrent fault is removed, the converter will immediately recover. (13) Do not exceed maximum power specifications when adjusting the output trim. (14) At zero output current, the output may contain low frequency components which exceed the ripple specification. The output may be operated indefinitely with no load. (15) Input Fusing: If reverse polarity is accidentally applied to the input, a body diode will become forward biased and will conduct considerable current. To ensure reverse input protection with full output load, always connect an external input fast-blow fuse in series with the +VIN input. Use approximately twice the full input current rating with nominal input voltage. (16) "Hiccup" overcurrent operation repeatedly attempts to restart the converter with a brief, full-current output. If the overcurrent condition still exists, the restart current will be removed and then tried again. This short current pulse prevents overheating and damaging the converter. Once the fault is removed, the converter immediately recovers normal operation. (17) Output accuracy is dependent on user-supplied trim resistors. To achieve high accuracy, use 1% or better tolerance metal-film resistors. (18) At full power, on-board component package temperatures must not exceed +128C. (19) VIN must be 2 Volts or higher than VOUT for +3.3 to +5V outputs.
Trim Connections
+VOUT RTRIM Trim RLOAD
Ground RTRIM (k) = 1.182 VOUT - 0.591
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 atmospheric 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 Maximum Pot Temperature Maximum Solder Dwell Time 115 C. 270 C. 7 seconds
For Sn/Pb based solders: Maximum Preheat Temperature Maximum Pot Temperature Maximum Solder Dwell Time 105 C. 250 C. 6 seconds
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
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MDC_MDC_LSS-T10-W12.A05 Page 4 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
PERFORMANCE DATA: EFFICIENCY VS LINE VOLTAGE AND LOAD CURRENT
Ta = +25C VOUT = 1.2V
92% 90% 88% 86% 84%
98% 96% 94% 92% 90%
VOUT = 3.3V
Efficiency (%)
82% 80% 78% 76%
VIN = 7 V VIN = 12 V VIN = 14 V
Efficiency (%)
88% 86% 84% 82%
VIN = 4.5 V VIN = 12 V VIN = 14 V
74% 72% 70% 68% 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A
80% 78% 76% 1A 2A 3A 4A 5A 6A 7A 8A 9A 10A
Load Current (Amps)
Load Current (Amps)
VOUT = 1.8V
96% 94% 92% 90% 88%
92% 100% 98% 96% 94%
VOUT = 5V
Efficiency (%)
86% 84% 82% 80% 78% 76% 74% 72% 1A 2A 3A
VIN = 4.5 V VIN = 12 V VIN = 14 V
Efficiency (%)
VIN = 7 V VIN = 12 V VIN = 14 V
90% 88% 86% 84% 82% 80% 78%
4A
5A
6A
7A
8A
9A
10A
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
Load Current (Amps)
Load Current (Amps)
VOUT = 6V
100% 98% 96% 94% 92%
VIN = 7 V VIN = 12 V VIN = 14 V
Efficiency (%)
90% 88% 86% 84% 82% 80% 78%
1A
2A
3A
4A
5A
6A
7A
8A
9A
10A
Load Current (Amps)
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MDC_MDC_LSS-T10-W12.A05 Page 5 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
PERFORMANCE DATA: MAXIMUM CURRENT TEMPERATURE DERATING
(VIN = 12V, transverse airflow, at sea level) VOUT = 1.2V
10.00 9.75 9.50 9.25 9.00
VOUT = 2.5V
10.03 9.78 9.53 9.28 9.03 8.78 8.53 8.28 8.03 7.78 7.53 7.28 7.03 6.78 6.53 6.28 6.03 5.78 5.53 5.28 5.03 4.78 4.53 20
300 LFM 400 LFM
300 LFM 400 LFM
8.50
Output Current (Amps) s
8.25 8.00 7.75 7.50 7.25 7.00 6.75 6.50 6.25 6.00 5.75 5.50 20
Natural Convection a 100 LFM 200 LFM
Output Current (Amps)
8.75
Natural Convection 100 LFM 200 LFM
25
30
35
40
45
50
55
60
65
70
75
80
85
90
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (C)
Ambient Temperature (C)
VOUT = 1.8V
10.00 9.75 9.50 9.25 9.00
VOUT = 3.3V
300 LFM 400 LFM
10.03 9.78 9.53 9.28 9.03 8.78 8.53 8.28 8.03 7.78 7.53 7.28 7.03 6.78 6.53 6.28 6.03 5.78 5.53 5.28 5.03 4.78 4.53 20
300 LFM 400 LFM
Output Current (Amps)
8.75 8.50 8.25 8.00 7.75 7.50 7.25 7.00 6.75 6.50 6.25 6.00 5.75 5.50 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90
Natural Convection 100 LFM 200 LFM
Output Current (Amps)
Natural Convection 100 LFM 200 LFM
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (C)
Ambient Temperature (C)
VOUT = 5V
10.03 9.78 9.53 9.28 9.03 8.78 8.53 8.28 8.03 7.78 7.53 7.28 7.03 6.78 6.53 6.28 6.03 5.78 5.53 5.28 5.03 4.78 4.53 20
300 LFM 400 LFM
Output Current (Amps)
Natural Convection 100 LFM 200 LFM
25
30
35
40
45
50
55
60
65
70
75
80
85
90
Ambient Temperature (C)
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MDC_MDC_LSS-T10-W12.A05 Page 6 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
PERFORMANCE DATA: OUTPUT RIPPLE AND NOISE (PARD)
VIN = 12V VOUT = 1.2V VOUT = 3.3V
VOUT = 1.8V
VOUT = 5V
VOUT = 2.5V
VOUT = 6V
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MDC_MDC_LSS-T10-W12.A05 Page 7 of 8
LSS-T/10-W12
Adjustable Output 10 Amp SIP-mount DC/DC Converter
PERFORMANCE DATA: TURN-ON, TURN-OFF TIMES
VIN = 12V On/Off Enable VIN Power On
On/Off Disable
VIN Power Off
USA: Canada: UK: France: Germany: Japan: China: Singapore:
Mansfield (MA), Tel: (508) 339-3000, email: sales@murata-ps.com Toronto, Tel: (866) 740-1232, email: toronto@murata-ps.com Milton Keynes, Tel: +44 (0)1908 615232, email: mk@murata-ps.com Montigny Le Bretonneux, Tel: +33 (0)1 34 60 01 01, email: france@murata-ps.com Munchen, Tel: +49 (0)89-544334-0, email: munich@murata-ps.com Tokyo, Tel: 3-3779-1031, email: sales_tokyo@murata-ps.com Osaka, Tel: 6-6354-2025, email: sales_osaka@murata-ps.com Shanghai, Tel: +86 215 027 3678, email: shanghai@murata-ps.com Guangzhou, Tel: +86 208 221 8066, email: guangzhou@murata-ps.com Parkway Centre, Tel: +65 6348 9096, email: singapore@murata-ps.com
Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000
Murata Power Solutions, Inc. 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Tel: (508) 339-3000 (800) 233-2765 Fax: (508) 339-6356
www.murata-ps.com email: sales@murata-ps.com ISO 9001 and 14001 REGISTERED
03/25/09
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. (c) 2009 Murata Power Solutions, Inc.
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