LSM16A-D12 MURATA | Alldatasheet
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Technical content
FEATURES
Step-down buck regulators for new distributed 12V power architectures 12V input (10-14V range) Non-isolated, fi xed-frequency, synchronous-rectifi er topology Tape and reel SMT package ±1.25% setpoint accuracy Effi ciencies to 96% @ 16 Amps Noise as low as 50mVp-p Stable no-load operation Remote on/off control Sense pin and output voltage trim No derating to +65°C with 200 lfm Designed to meet UL/IEC/EN60950-1 safety EMC compliant Ḥ +INPUT (2) COMMON (3) PWM CONTROLLER CURRENT SENSE REFERENCE & ERROR AMP VCC ON/OFF CONTROL (1) VOUT TRIM (5) +OUTPUT (4) +SENSE (6) COMMON (3) Figure 1. Simplifi ed Schematic ber of non-isolated, step-down buck regulators. and are only 0.34 inches (8.6mm) high.
Output Input Effi ciency (Full Load) Package (Case, Pinout) VOUT (Volts) IOUT (Amps) R/N (mVp-p) ➁ Regulation (Max.) ➂ VIN Nom. (Volts) Range (Volts) IIN ➃ (mA/A) VIN = nom. V IN = min LSM-1/16-D12 1 16 50 75 ±0.1% ±0.25% 12 10-14 35/1.57 83% 85% 86% C45, P63 LSM-2/16-D12 2 16 50 75 ±0.1% ±0.25% 12 10-14 55/2.93 89% 91% 91.5% C45, P63 Pin Function P63
1 On/Off Control
3 Common
➀ Typical at TA = +25°C under nominal line voltage and full-load conditions, 200 lfm air fl ow for extended operation, unless otherwise noted. All models are tested and specifi 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 specifi ed performance in your applications. See I/O Filtering and Noise Reduction. ➁ Ripple/Noise (R/N) is tested/specifi ed over a 20MHz bandwidth and may be reduced with external fi ltering. See I/O Filtering and Noise Reduction for details. ➂ These devices have no minimum-load requirements and will regulate under no-load conditions. Regulation specifi cations describe the output-voltage deviation as the line voltage or load is varied from its nominal/midpoint value to either extreme. ➃ Nominal line voltage, no-load/full-load conditions. ➄ RoHS6 compliance does not claim EU RoHS exemption 7b–lead in solder. Performance Specifi cations and Ordering Guide ➀ Case C45 0.34 (8.64) 0.53 (13.46) 0.48 (12.19) 0.430 (10.92) 0.405 (10.29) 0.085 (2.16) 1.30 (33.02) SMT COPPER LEADS COPLANAR 0.004 1.177 (29.90) 0.310 (7.87) 0.048 (1.22) 0.075 (1.91) BOTTOM VIEW RECOMMENDED PAD LAYOUT 0.05 (1.27) 0.062 (1.57) TYP . 0.112 (2.84) TYP . 0.570 (14.48) 3 EQ. SP . @ 0.190 (4.83) 0.310 (7.87) Recommended Pad Size: 0.15 x 0.10 (3.81 x 2.54) 0.297 (7.54) 0.570 (14.48) 3 EQ. SP . @ 0.190 (4.83) 3 4 5 6 6 5 4 3 Maximum Rated Output Current in Amps Non-Isolated SMT Output Confi guration: L = Unipolar Low Voltage Nominal Output Voltage: Input Voltage Range: D12 = 10 to 14 Volts (12V nominal) L SM 16- / D12-1.8 1.36 (34.54) 0.375 (9.53) 0.112 TY P. (2.84) 0.052 (1.32) 0.60 (15.24) 0.049 (1.24) 0.310 (7.87) 0.010 (0.254) 0.55 (13.97) 0.052 (1.32) 0.062 (1.57) 0.047 (1.19) 0.570 (14.48) 3E Q .S P .@ 0.190 (4.83) 3456 NOTCH IN SHELL INDICATES PIN ONE CAUTION PRESS TO REMOVE THE HEAT SHIELD AFTER THE SOLDER PROCESS NOTCH IN SHELL INDICATES PIN ONE LSM WITH REMOVABLE HEAT SHIELD FOR HIGH TEMPERATURE SOLDER BOTTOM VIEW Note: Not all model number combinations are available. Contact MPS. RoHS6 hazardous substance compliant*➄ C * Contact Murata Power Solutions for availability. Part Number Structure Mechanical Specifications Third Angle Projection Dimensions are in inches (mm shown for ref. only). Components are shown for reference only. Tolerances (unless otherwise specified): .XX ± 0.02 (0.5) Angles ± 2˚ LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 2 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
Input Voltage Range 10-14 Volts (12V nominal) Startup Voltage 8.5-9.2 Volts (model dependent) Input Current: Normal Operating Conditions See Ordering Guide Inrush Transient 0.08A 2 sec Standby/Off Mode 1.5mA Output Short-Circuit Condition ➁ 12-40mA average (model dependent) Input Refl ected Ripple Current ➁ ➅ 20-50mAp-p, model dependent Input Filter Type Capacitive Overvoltage Protection None Reverse-Polarity Protection None Undervoltage Shutdown 7.5-8 Volts (model dependent) On/Off Control ➁ ➂ On = open lead Off = -0.3V to +0.2V (3µA max.) Output VOUT Accuracy (50% load) ±1.25% Minimum Loading ➀ No load Maximum Capacitive Load 1000µF (low ESR, OSCON) VOUT Trim Range ±10% Ripple/Noise (20MHz BW) ➀ ➁ ➃ See Ordering Guide Total Accuracy 3% over line/load/temperature Effi ciency See Ordering Guide Overcurrent Detection and Short-Circuit Protection: ➁ Current-Limiting Detection Point 21-33 Amps (model dependent) Short-Circuit Detection Point 98% of V OUT set SC Protection Technique Hiccup with auto recovery Short-Circuit Current 125-420mA average (model dependent) Dynamic Characteristics Transient Response (50% load step) 30-135µsec to ±2% of fi nal value (model dependent) Start-Up Time: ➁ V IN to VOUT and On/Off to VOUT 60msec for V OUT = 1V and 0.75V 40msec for V OUT = 1.2V to 5V Switching Frequency 260kHz ±10% Environmental Calculated MTBF ➄ LSM-1.2/16-D12 9,160,138 hours LSM-1.5/16-D12 8,674,318 hours LSM-1.8/16-D12 8,334,117 hours LSM-2.5/16-D12 8,534,580 hours LSM-3.3/16-D12 7,817,255 hours LSM-5/16-D12 7,756,061 hours Operating Temperature: (Ambient) ➁ –40 to +85°C (with Derating) See Derating Curves Thermal Shutdown +115°C (110 to 125°C) Physical Lead Dimensions/Material 0.112" x 0.062" (2.84 x 1.57mm) rectangular copper alloy with gold plate over nickel underplate Weight 0.28 ounces (7.8g) Flamability Rating UL94V-0 Safety Designed to meet UL/cUL/IEC/EN 60950-1, CSA-C22.2 No. 234 Performance/Functional Specifi cations Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀ ➀ All models are tested and specifi 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 specifi ed 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 1) is designed to be driven with open-collector logic (referenced to Common, pin 3) or a switch to ground. ➃ Output noise may be further reduced with the installation of additional external output fi ltering. See I/O Filtering and Noise Reduction. ➄ MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fi xed, T a = +25°C, full power, natural convection, +67°C pcb temperature. ➅ Input Ripple Current is tested/specifi ed over a 5Hz-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.Input Voltage: Continuous or transient 15 Volts On/Off Control (Pin 1) +6V Input Reverse-Polarity Protection None Output Overvoltage Protection None Output Current Current limited. Devices can withstand sustained output short circuits without damage. Storage Temperature –55 to +125°C Lead Temperature See Refl ow Solder Profi le 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 Specifi cations Table is not implied. Absolute Maximum Ratings I/O Filtering and Noise Reduction All models in the LSM D12 Series are tested and specifi 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 desired performance in your application. The LSM 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 LSM D12s input capacitors are specifi ed for low ESR and are fully rated to handle the units’ input ripple currents. Similarly, the internal output capacitors are specifi ed 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 fi 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/DCs requires that the dc input voltage source have low ac impedance at the frequencies of interest. Highly inductive source imped- ances can greatly affect system stability. Your specifi c system confi guration may necessitate additional considerations. Technical Notes LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 3 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
Where VO is the desired output voltage. CAUTION: To retain proper regulation, do not exceed the 5 Volt output. (Trim pin open), the output is 0.7525 Volts. Figure 7. Trim Connections Using Fixed Resistors values. Recall, untrimmed devices are guaranteed to be ±1.25% accurate. rated power must not be exceeded (see Remote Sense). to tolerances of resistors and factory-adjusted, initial output accuracy. VO = desired output voltage. VONOM = nominal output voltage.
Many DC/DCs using synchronous rectifi cation suffer from Output Reverse Conduction. If those devices have a voltage applied across their output before a voltage is applied to their input (this typically occurs when another power supply starts before them in a power-sequenced application), they will either fail to start or self destruct. In both cases, the cause is the “freewheeling” or “catch” FET biasing itself on and effectively becoming a short circuit. LSM D12 SMT DC/DC converters do not suffer from Output Reverse Conduc- tion. They employ proprietary gate drive circuitry that makes them immune to applied output voltages. Thermal Considerations and Thermal Protection The typical output-current thermal-derating curves shown below enable designers to determine how much current they can reliably derive from each model of the LSM D12 SMTs under known ambient-temperature and air-fl ow conditions. Similarly, the curves indicate how much air fl ow is required to reli- ably deliver a specifi c output current at known temperatures. The highest temperatures in LSM D12 SMTs occur at their output inductor, whose heat is generated primarily by I 2R losses. The derating curves were developed using thermocouples to monitor the inductor temperature and vary- ing the load to keep that temperature below +110°C under the assorted condi- tions of air fl ow and air temperature. Once the temperature exceeds +115°C (approx.), the thermal protection will disable the converter. Automatic restart occurs after the temperature has dropped below +110°C. As you may deduce from the derating curves and observe in the effi ciency curves on the following pages, LSM D12 SMT's maintain virtually constant effi ciency from half to full load, and consequently deliver very impressive temperature performance even if operating at full load. Lastly, when LSM D12 SMT's are installed in system boards, they are obviously subject to numerous factors and tolerances not taken into account here. If you are attempting to extract the most current out of these units under demanding temperature conditions, we advise you to monitor the output- inductor temperature to ensure it remains below +110°C at all times. LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 7 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
Typical Performance Curves for LSM D12 SMT Series ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). UQQ-5/17-Q12P Efficiency vs. Line Voltage and Load Current @ 25°C Load Current (Amps) Efficiency (%) VIN = 10V VIN = 12V VIN = 14V 1 2 3 4 5 6 7 8 ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 8 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM Typical Performance Curves for LSM D12 SMT Series LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 9 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT # ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). ,3- %FFICIENCYVS,INE6OLTAGEAND,OAD#URRENT ,OAD#URRENT!MPS %FFICIENCY 6). 6). 6). n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM n ,3- $-AXIMUM#URRENT4EMPERATURE$ERATING 6). AIRFLOWDIRECTIONISTRANSVERSE /UTPUT#URRENT!MPS !MBIENT4EMPERATUREo# LFM LFM LFM .ATURAL #ONVECTION LFM Typical Performance Curves for LSM D12 SMT Series LSM-16A D12 Models Non-Isolated, 13-80W SMT DC/DC Converters MDC_LSM 16A D12 Models.A05 P age 10 of 12 Technical enquiries email: sales@murata-ps.com, tel: +1 508 339 3000www.murata-ps.com
Figure 6. Refl ow Solder Profi le and subsequently refl owed using high-temperature, lead-free solder. demand you “cool down” the Sn63 profi le you are likely using today. of the unit’s copper leads. These leads are gold-plated with a nickel underplate. See Mechanical Data for additional information. temperature differentials as high as 50°C develop inside-to-outside the shield.