NQ16W50SMA16 SYNQOR | Alldatasheet

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SSpecificationpecification NQ16W50SMA16NQ16W50SMA16 Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 1 TThhee NNiiQQoorr®® SSMMTT DDCC//DDCC ccoonnvveerrtteerr iiss aa nnoonn--iissoollaatteedd bbuucckk rreegguullaattoorr,, wwhhiicchh eemmppllooyyss ssyynncchhrroonnoouuss rreeccttiiffiiccaattiioonn ttoo aacchhiieevvee eexxttrreemmeellyy hhiigghh ccoonnvveerrssiioonn eeffffiicciieennccyy.. TThhee NNiiQQoorr ffaammiillyy ooff ccoonnvveerrtteerrss aarree uusseedd pprreeddoommiinnaatteellyy iinn DDPPAA ssyysstteemmss uussiinngg aa ffrroonntt eenndd DDCC//DDCC hhiigghh ppoowweerr bbrriicckk ((4488VViinn ttoo llooww vvoollttaaggee bbuuss)).. TThhee nnoonn--iissoollaatteedd NNiiQQoorr ccoonnvveerrtteerrss aarree tthheenn uusseedd aatt tthhee ppooiinntt ooff llooaadd ttoo ccrreeaattee tthhee llooww vvoollttaaggee oouuttppuuttss rreeqquuiirreedd bbyy tthhee ddeessiiggnn.. TThhee wwiiddee ttrriimm mmoodduullee ccaann bbee pprroo-- ggrraammmmeedd ttoo aa vvaarriieettyy ooff oouuttppuutt vvoollttaaggeess tthhrroouugghh tthhee uussee ooff aa ssiinnggllee eexxtteerrnnaall rreessiissttoorr.. RRooHHSS ccoommpplliiaanntt ((sseeee ppaaggee 1122)).. NiQor surface mount module Non-IsolatedNon-Isolated InputInput OutputsOutputs CurrentCurrent IsolatedIsolated SurSur face Mountface Mount

  • Ultra high efficiency, up to 94% at full rated load
  • Delivers up to 16 Amps of output current with minimal derating - no heatsink required
  • Input Voltage Range : 6.0 - 16.0V
  • Fast transient response time
  • On-board input and output filter capacitor
  • No minimum load requirement means no preload resis- tors required Operational FeaturesOperational Features
  • Input under-voltage lockout disables converter at low input voltage conditions
  • Temperature compensated over-current shutdown pro- tects converter from excessive load current or short cir- cuits
  • Output over-voltage protection protects load from dam- aging voltages
  • Thermal shutdown protects converter from abnormal environmental conditions PrProtection Featuresotection Features
  • UL/cUL 60950-1 recognized (US & Canada)
  • TUV certified to EN60950-1
  • Meets 72/23/EEC and 93/68/EEC directives which facilitates CE Marking in user’s end product
  • Board and plastic components meet UL94V-0 flammabil- ity requirements Safety FeaturesSafety Features
  • DOSA standard SMT pin-out configuration
  • Industry standard size: 1.3” x 0.53” x 0.29” (33 x 13.5 x 7.3 mm)
  • Total weight: 0.18 oz. (5 grams), lower mass great- ly reduces vibration and shock problems
  • Open frame construction maximizes air flow cooling
  • Also available in SIP packaging Mechanical FeaturesMechanical Features
  • On/Off control
  • Output voltage trim (industry standard) permits custom voltages and voltage margining
  • Remote Sense (standard option) ContrContr ol Featuresol Features

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 2 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification Pin No. Name Function

1 N/C No Connection

2 GND Ground

3 Vout(+) Positive output voltage

4 TRIM Output Voltage Trim

5 SENSE(+) Positive remote sense

6 Vin(+) Positive input voltage

7 ON/OFF Input to turn converter on/off

1) SMT Contacts: Material - Brass Finish - Gold over Nickel plate 2) Undimensioned components are shown for visual reference only. 3) All dimensions in inches (mm) 4) Coplanarity for pins 1-7 is 0.004” max 5) Weight: 0.18 oz. (5 g) typical 6) Workmanship: Meets or exceeds IPC-A-610C Class II 1.057 (26.85) 1.177 (29.90) 0.487 (12.37) 0.297 (7.54) 0.677 (17.20) 0.867 (22.02) 0.53 (13.5)0.405 (10.29) 0.048 (1.22) see Note 4 0.075 (1.91) 0.025 (0.64) 0.063 (1.6) 0.288+.018 (7.32+0.45) 0.012+.007 (0.3+0.17) 0.100 (2.54) 1.30 (33.0) 1 2345 Surface Mount Package Side View Bottom View SMT CONTACT DESIGNATIONS MECHANICAL DIAGRAM Typ. Bottomside Clearance 0.063 (1.60) Typ. Recommended SMT Pad Size: Minimum: 0.074” x 0.122” (1.88mm x 3.1mm) Maximum: 0.095” x 0.140” (2.41mm x 3.56mm) Pins in Italics Shaded text are Optional

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 3 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification Parameter Module Min. Typ. Max. Units Notes & Conditions ABSOLUTE MAXIMUM RATINGS Input Voltage Non-Operating All 0 18 V Continuous Operating All 16 V Continuous Operating Temperature All -40 105 °C Storage Temperature All -55 125 °C Voltage at ON/OFF input pin All -3 15 V RECOMMENDED OPERATING CONDITIONS Input Voltage Range All 6 16 V Input Fuse Rating All 20 A Fast blow external fuse recommended External Input Capacitance All 100 µF ESR<1.5 W Output Voltage All 0.75 5.5 V Output Current All 0 16 A INPUT CHARACTERISTICS Input Under-Voltage Lockout Turn-On Voltage Threshold All 5.35 5.73 6.10 V Turn-Off Voltage Threshold All 4.50 4.73 4.95 V Lockout Hysteresis All 1 V Maximum Input Current 0.75V 2.8 A 6Vin, 100% load “ 2.5V 7.5 A “ “ 5.0V 14.0 A “ No-Load Input Current 0.75V 31 mA 12Vin “ 2.5V 71 mA “ “ 5.0V 132 mA “ Disabled Input Current All 3 mA Inrush Current Transient Rating All 0.1 A 2s With min. output capacitance Input Filter Capacitor Value All 30 µF Input Reflected-Ripple Current 0.75V 36 mA 12Vin, 100% load, pk-pk value “ 2.5V 68 mA “ “ 5.0V 98 mA “ OUTPUT CHARACTERISTICS Output Voltage Set Point 0.75V 0.745 0.75 0.755 V 12Vin 50% load Output Voltage Range All 0.75 5.0 V Set output by Rtrim-up Operating Output Current Range All 0 16 A Output Voltage Regulation Over Line All 0.5 % With sense pin Over Load All 0.5 % “ Over Temperature All 1 % “ Total Output Voltage Range All 3 % With sense pin, over sample, line, load, temp. & life Output Voltage Ripple and Noise (pk-pk\\RMS) 1.0V 27\\5.0 mV Full load; 20MHz bandwidth Output DC Over Current Shutdown All 20 24 28 A External Output Capacitance All 100 5000 µF >0.5mW DYNAMIC CHARACTERISTICS Input Voltage Ripple Rejection All 50 dB 120Hz Output Voltage during Current Transient For a Step Change in Output Current (0.1A/µs) All 180 mV 50%-75%-50% Iout max; 100uF For a Step Change in Output Current (3A/µs) All 180 mV 50%-75%-50% Iout max; 470uF Settling Time All 100 µs To within 1.5% Vout nom. Turn on Transient Inhibit Time All 2 4 ms Resistive load Rise Time All 2 6 ms “ Output Voltage Overshoot All 0 V “ EFFICIENCY 100% Load 0.75V 77.0 % “ 2.5V 90.0 % “ 5.0V 94.0 % 50% Load 0.75V 81.0 % “ 2.5V 91.5 % “ 5.0V 94.0 % ELECTRICAL CHARACTERISTICS - NQ16W50SMA16 Series TA=25°C, airflow rate=300 LFM, V in=12Vdc unless otherwise noted; full operating temperature range is -40°C to +105°C ambient tem- perature with appropriate power derating. Specifications subject to change without notice.

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 4 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification STANDARDS COMPLIANCE ParameterP Notes STANDARDS COMPLIANCE UL/cUL 60950-1 File # E194341 EN60950-1 Certified by TUV 72/23/EEC 93/68/EEC Needle Flame Test (IEC 695-2-2) Test on entire assembly; board & plastic components UL94V-0 compliant IEC 61000-4-2 ESD test, 8kV - NP, 15kV air - NP (Normal Performance) GR-1089-CORE Section 7 - electrical safety, Section 9 - bonding/grounding Telcordia (Bellcore) GR-513

  • An external input fuse must always be used to meet these safety requirements. Contact SynQor for official safety certificates on new releases or download from the SynQor website . QUALIFICATION TESTING ParameterP # Units Test Conditions QUALIFICATION TESTING Life Test 32 95% rated V in and load, units at derating point, 1000 hours Vibration 5 10-55Hz sweep, 0.060” total excursion,1 min./sweep, 120 sweeps for 3 axis Mechanical Shock 5 100g minimum, 2 drops in x and y axis, 1 drop in z axis Temperature Cycling 10 -40°C to 100°C, unit temp. ramp 15°C/min., 500 cycles Power/Thermal Cycling 5 T operating = min to max, Vin = min to max, full load, 100 cycles Design Marginality 5T min-10°C to Tmax+10°C, 5°C steps, Vin = min to max, 0-105% load Humidity 5 85°C, 85% RH, 1000 hours, continuous Vin applied except 5min./day Solderability 15 pins MIL-STD-883, method 2003
  • Extensive characterization testing of all SynQor products and manufacturing processes is performed to ensure that we supply robust, reliable product. Contact the factory for official product family qualification documents. OPTIONS SynQor provides various options for Packaging, Enable Logic, and Feature Set for this family of DC/DC converters. Please con- sult the last page for information on available options. PATENTS SynQor is protected under various patents. Please consult the last page for further details. ELECTRICAL CHARACTERISTICS (continued) - NQ16W50SMA16 Series Parameter Module Min. Typ. Max. Units Notes & Conditions TEMP LIMITS FOR POWER DERATING Semiconductor Junction Temperature All 125 °C Package rated to 150°C Board Temperature All 125 °C UL rated max operating temp 130°C FEATURE CHARACTERISTICS Switching Frequency All 275 300 325 kHz Half on small duty cycle (e.g. 16Vin; 0.75Vout) ON/OFF Control Open Logic (O) ON/OFF Control See Figure A Off-State Voltage All 1.5 6.5 V On-State Voltage All -3.0 0.6 V Input Resistance All 20 kW Positive Logic (P) ON/OFF Control Open collector/drain input; see Figure A Logic Low Voltage Range All -0.2 1.0 V Logic High Voltage Range (internal pullup) All 2.2 Vin V Pull-up Voltage All 5 V Pull-up Resistance All 100 kW Output Voltage Trim Range All 0.75 5.5 V Measured Vout+ to common pins Output Over-Voltage Protection All 5.6 6.0 6.4 V Over full temp range Over-Temperature Shutdown All 128 °C Average PCB Temperature Over-Temperature Shutdown Restart Hysteresis All 10 °C RELIABILITY CHARACTERISTICS Calculated MTBF (Telcordia) All 15.6 106 Hrs. TR-NWT-000332; 100% load, 200LFM, 40oC Ta Calculated MTBF (MIL-217) All 10.0 106 Hrs. MIL-HDBK-217F; 100% load, 200LFM, 40oC Ta Field Demonstrated MTBF All 106 Hrs. See our website for details

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 5 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification 0 25 40 55 70 85 Ambient Air Temperature (°C) Iout (A) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 6 layers 2oz cu board Figure 5: Maximum output power derating curves for 1.8Vo, 2.5Vo units under various thermal conditions and nominal input voltage. See Thermal Considerations section for more details. Figure 6: Thermal plot of 1.8Vo, 2.5Vo converters at nominal Vin and 16 amp load current mounted on a 70 °C, 6-Layer, 2 oz. copper board (typical installation). 100 0 2 4 6 8 10 12 14 16 Load Current (A) Efficiency (%)

5.0 Vout

2.5 Vout

0.75 Vout

Figure 1: Efficiency at nominal output voltage vs. load current for nom- inal input voltage at 25 °C. 0 2 4 6 8 10 12 14 16 Load Current (A) Power Dissipation (W) 5.0 Vout Figure 2: Power dissipation at nominal output voltage vs. load current for nominal input voltage at 25 °C. 0 25 40 55 70 85 Ambient Air Temperature (°C) Iout (A) 400 LFM (2.0 m/s) 300 LFM (1.5 m/s) 200 LFM (1.0 m/s) 100 LFM (0.5 m/s) 6 layers 2oz cu board Figure 3: Maximum output power derating curves for 0.75Vo, 1.2Vo, 1.5Vo units under various thermal conditions and nominal input volt- age. See Thermal Considerations section for more details. Figure 4: Thermal plot of 0.75Vo, 1.2Vo converters at nominal Vin and 16 amp load current mounted on a 85 °C, 6-Layer, 2 oz. copper board (typical installation). Semiconductor junction temperature is within 1°C of surface temperature Semiconductor junction temperature is within 1°C of surface temperature

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 7 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification 0.0001 0.001 0.01 0.1 10 100 1,000 10,000 100,000 Hz Output Impedance (ohms) 5 Vout

1.5 Vout

Figure 17: Magnitude of incremental output impedance (Z out = vout/iout) for nominal input voltage at full rated power with 100 µF tan- talum output capacitor. -90 -80 -70 -60 -50 -40 -30 -20 -10 100 1,000 10,000 100,000 1,000,000 Hz Forward Transmission (dB)

5 Vout

Figure 18: Magnitude of incremental forward transmission (FT = vout/vin) for nominal input voltage at full rated power with 100 µF tan- talum output capacitor. Figure 13: Test set-up diagram showing measurement points for Input Reflected Ripple Cur rent (Figure 14), Input Terminal Ripple V oltage (Figure 15), and Output Voltage Ripple (Figure 16). Figure 14: Input Reflected Ripple Current, i s, through a 1 µH source inductor at nominal input voltage and rated load cur rent (100 mA/div). See Figure 13. Figure 15: Input Terminal Ripple Voltage at nominal input voltage and rated load current (200 mV/div). Load capacitance: 22 µF ceramic cap and 100µF tantalum cap. Bandwidth: 20 MHz. See Figure 13. Figure 16: Output Voltage Ripple at nominal input voltage and rated load current (50 mV/div). Load capacitance: 22 µF ceramic cap and 100µF tantalum cap.. Bandwidth: 20 MHz. See Figure 13. 1.8Vout 3.3Vout 5.0Vout 0.9Vout 1.8Vout 3.3Vout 5.0Vout 0.9Vout 1.8Vout 3.3Vout 5.0Vout 0.9Vout 1 µH source impedance See Fig. 14 See Fig. 15 See Fig. 16 22 µF ceramic capacitor 100 µF 100mW ESR tantalum capacitor VSOURCE iS VOUTVIN * See values for recommended external input capacitance. Inductor optional as needed. DC/DC Converter

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 8 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification -45 -40 -35 -30 -25 -20 -15 -10 10 100 1,000 10,000 100,000 1,000,000 Hz Reverse Transmission (dB)5 Vout Figure 19: Magnitude of incremental reverse transmission (RT = iin/iout) for nominal input voltage at full rated power with 100 µF tanta- lum output capacitor. 0.0001 0.001 0.01 0.1 100 10 100 1,000 10,000 100,000 Hz Input Impedance (ohms) Figure 20: Magnitude of incremental input impedance (Z in = vin/iin) for nominal input voltage at full rated power with 100µF tantalum out- put capacitor .

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 9 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification BASIC OPERATION AND FEATURES The NiQor series non-isolated converter uses a buck-converter that keeps the output voltage constant over variations in line, load, and temperature. The NiQor modules employ synchronous rectification for very high efficiency. Dissipation throughout the converter is so low that it does not require a heatsink or metal baseplate for operation. The NiQor converter can thus be built more simply and reliably using high yield surface mount techniques on a single PCB substrate. The NiQor series of SIPs and SMT converters uses the established industry standard footprint and pin-out configurations. CONTROL FEATURES REMOTE ON/OFF: The ON/OFF input permits the user to con- trol when the converter is on or off. There are currently two options available for the ON/OFF input described in the table below. Others may become available if demand exists. OUTPUT VOLTAGE TRIM: The TRIM input permits the user to adjust the output voltage according to the trim range specifica- tions by using an external resistor. If the TRIM feature is not being used, leave the TRIM pin disconnected. TRIM-UP: To increase the output voltage from the nominal set- point of 0.7525V using an external resistor, connect the resistor Rtrim-up between the TRIM and the Ground pin according to the diagram below. For a desired increase of the nominal output voltage, the value of the resistor should be: To maintain the accuracy of the output voltage over load current, it is vital that any trim-up resistor be terminated directly to the con- verter's ground foot, not at the connection to the load. A sepa- rate Kelvin connection to the PCB pad for the ground foot is opti- mal. Trim-down resistors should be terminated at the converter's Sense+ pin. We do not recommend bypassing the trim pin directly to ground with a capacitor. The voltage gain from the trim pin to output is rather large, 15:1. Ground bounce through a bypass capacitor could introduce significant noise to the converter's control circuit. PROTECTION FEATURES Input Under-Voltage Lockout : The converter is designed to turn off when the input voltage is too low, helping avoid an input system instability problem, described in more detail in the appli- cation note titled “Input System Instability”. The lockout circuitry is a comparator with DC hysteresis. When the input voltage is rising, it must exceed the typical Turn-On Voltage Threshold value (listed on the specification page ) before the converter will turn on. Once the converter is on, the input voltage must fall below the typical Turn-Off Voltage Threshold value before the converter will turn off. Output Current Limiting : To provide protection in an output over load fault condition, the unit is equipped with internal over- current protection. When the over-current protection is triggered, the unit enters hiccup mode. The units operate normally once the fault condition is removed. Internal Over-Voltage Protection : To fully protect from excessive output voltage, the NQ16 series contains an Output Over-Voltage Shutdown circuitry. This OVP is independent of the trimmed setpoint. As such, the converter's load is protected from faults in the external trim cir- cuitry (such as a trim pin shorted to ground). Since the setpoint of this OVP does not track trim, it is set at 6.0V, in the wide-trim W50 model. Rtrim-up Vin On/Off Vout Sense+ Trim Gnd (W)Rtrim-up = where VDES = Desired Output Voltage VDES - 0.7525 10500 _ 1000 (W)VOUT = 10500 Rtrim-up + 1000 or 0.7525 + Option Description Pin-Open Float Voltage Pin-Open Converter State Pin Action P Logic Positive/Open 5 On Pull Low = Off O Logic Negative/Open 0 On Pull High = Off

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 10 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification The shutdown point is fixed on standard option. SMA also offers adjustable OVP set point. For more detailed information contact SynQor technical support. Over-Temperature Shutdown : A temperature sensor on the converter senses the average temperature of the module. The thermal shutdown circuit is designed to turn the converter off when the temperature at the sensed location reaches the Over- Temperature Shutdown value. It will allow the converter to turn on again when the temperature of the sensed location falls by the amount of the Over-Temperature Shutdown Restart Hysteresis value. APPLICATION CONSIDERATIONS Input Filtering/Capacitance/Damping : The filter circuit of Figure E is often added to the converter's input to prevent switch - ing noise from reaching the input voltage bus. In the SMA16 (surface mount) converters Cin = 30µF of high quality ceramic capacitors. With Lin of 1µH, Cd should be 100- 200µF and Rd should be 0.1-0.2 W, in most applications. For more information on designing the input filter and choosing prop- er values, contact SynQor technical support. Adding significant external pure ceramic capacitance directly across the converter's input pins is not recommended. Parasitic inductance associated with the input pin geometry and PCB traces can create a high-Q CLC circuit with any external capaci- tors. Just a few nano-Henries of parasitic inductance can create a resonance (or an overtone) near the converter's switching fre- quency. Cin has a reactance of 10-20m W at the 300kHz switch- ing frequency. To avoid this high-frequency resonance, any exter- nal input filter should exhibit a net source impedance of at least 20mW resistive through this frequency range. This requirement is easily met with the damping elements discussed above. Adding a small amount (a few µF) of high-frequency external ceramic will not violate it. If using converters at higher powers, consider the ripple current rating of Cd. Contact SynQor technical support for details. Output Capacitance : It is recommended to add at least 100µF of capacitance, with an ESR in the 0.1 W range, to the out- put of the SMA16 series of converters. The VMA16 series has this capacitance included internally. In many applications, how- ever, additional external output capacitance is required to reduce the response to load transients to an allowable level. The output impedance of these converters can be quite accurately modeled from DC to about 100kHz as shown in Figure F. A further simplified ver- sion of it, valid below 40Hz and above 1kHz, is shown in Figure G. In the SMA16 case, the mod- els depict the minimum recommended output capacitance, Ct with its resistance Rt. In the VMA16 family, that capacitor is again included in the con- verter. If the dynamic char- acteristics of the load are known, any stan- dard simulator can use these models to predict the in-circuit transient response. For minimal overshoot upon recover y, Cd should be related to the minimum in-circuit net ESR. For more detailed derivations of these values contact SynQor technical support. Figure F: NQ16 Passive Output Model Figure G: Simplified NQ16 Output Model Figure H: Converter with Additional Output Capacitance Cd > parallel (L1, L2) ESRdmin Figure E: NQ16 converter with Input Filter

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 11 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification Thermal Performance (SMA16): While impossible to be exact, a simplified thermal model for the mounted converter is detailed below.

  • Rt_J-Pcb models the conduction of heat from the converter's hottest junction to the converter's PCB at large. It is about 3oC/W for converters running at higher output voltage, and about 4oC/W for lower voltage converters.
  • Rt_Pcb-Amb models the power dissipation from converter PCB to the air stream. It ranges from about 15 oC/W at 400LFM to about 25oC/W 100LFM.
  • Rt_Pcb-Feet expresses the thermal path from the converter's PCB though its mounting feet; it is about 3 oC/W.
  • Rt_spread models the heat spreading on the PCB to which the converter is mounted and is largely dependent upon the con- struction and layout of that PCB.
  • T_mount is the temperature of that PCB in the greater vicinity of the converter. As is evident, the values for Rt_spread and T_mount will have great effect upon the thermal operation of the converter. With Rt_Pcb-Amb being 5 to 8 times as large as Rt_Pcb-Feet, in most applications these converters will be predominantly cooled via thermal conduction through their feet. Airflow and T_Amb will have only a minimal cooling effect.
  • Rt_spread should be minimized. Attach the converter to large copper planes, on multiple layers, with multiple vias near the mounting feet.
  • T_mount should also be minimized. Place the converter far enough away from other sources of heat on the PCB so that it is as cool as practical.
  • If operation near derating limits is even suspected, thermal per- formance should be verified with the unit mounted in its intend- ed manner and powered in circuit with all neighboring circuit - ry active. Attach a thermocouple to the converter's hotspot as shown in Figures 4 , 6, and 8 in the Performance Curves sec- tion. SURFACE MOUNT INFORMATION PCB Layout Considerations: SynQor recommends that the customer use a non-solder mask defined pad design. The mini- mum recommended pad size is 0.074" x 0.122" (1.88mm x 3.1mm) and the maximum pad size is 0.095" x 0.140" (2.41mm x 3.56mm), see the mechanical diagram on page 2 . Interconnection to internal power planes is typically required. This can be accomplished by placing a number of vias between the SMT pad and the relevant plane. The number and location of the vias should be determined based on electrical resistance, current and thermal requirements. "Via-in-pad" design should be avoided in the SMT pads. Solder mask should be used to elimi- nate solder wicking into the vias. Pick and Place: The NiQor surface mount modules are designed for automated assembly using standard SMT pick and place equipment. The modules have a centrally located inductor component with a flat surface area to be used for component pick-up. The units use open frame construction and have a low mass that is within the capability of standard pick and place equipment. Those modules however have a larger mass than most conventional SMT components and so variables such as nozzle size, tip style, handling speed, and placement pressure should be optimized for best results. A conformal tipped place - ment nozzle design is recommended. Coplanarity of better than 0.004" (0.1mm) is achieved through the SMT NiQor's ter minal design. Figure I: Thermal Model for NQ16 Surface Mount

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 12 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification Reflow Soldering Guidelines: Figure J shows a typical reflow profile for a eutectic sol- der process. Due to variations in customer applications, materials and processes, it is not feasible for SynQor to recommend a specific reflow profile. The customer should use this pro- file as a guideline only. Since the NiQor sur- face mount modules have a larger thermal mass and lower thermal resistance than standard SMT components, it may be necessary to opti- mize the solder reflow profile based on limita- tions of the other components on the customer board. Sufficient reflow time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. The solder reflow profile should be confirmed by accurately measuring the SMT interconnect leads. Maximum case temperature of 260°C (exposure for 5 seconds or less) is not exceeded for the NiQor units. Moisture Sensitivity: The NiQor surface mount modules have an MSL rating 1 per IPC/JEDEC J-STD-033A. Cleaning and Drying: When possible, a no-clean solder paste system should be used to solder the NiQor SMT units to their application board. The modules are suitable for aqueous washing, however, the user must ensure sufficient drying to remove all water from the converter before powering up. Inadequate cleaning and drying can affect the reliability of the converter and the testing of the final assembly . RoHS Compliance: The EU led RoHS (Restriction of Hazardous Substances) Directive bans the use of Lead, Cadmium, Hexavalent Chromium, Mercury, Polybrominated Biphenyls (PBB), and Polybrominated Diphenyl Ether (PBDE) in Electrical and Electronic Equipment. This SynQor product is 6/6 RoHS compliant. For more information please refer to SynQor’s RoHS addendum available at our RoHS Compliance / Lead Free Initiative web page or e-mail us at rohs@synqor .com. 2 to 4 min. Maximum Temperature (+210-260oC) Eutectic Solder Melting Point (+183oC) (+150-155oC) Pre-heat Soak Reflow Cool Down

  • < 2.5oC/sec
  • 0.5-0.6oC/sec
  • 60 to 90 sec., typ., 2 min max
  • 1.3-1.6oC/sec
  • 30 to 60 sec., typ., 90 sec max Figure J: Typical Eutectic (96.5Sn/3.0Ag/0.5Cu) Solder Pr ofile

Product # NQ16W50SMA16 Phone 1-888-567-9596 www.synqor.com Doc.# 005-2NS12WE Rev. A 11/26/07 Page 13 Input:Input: Outputs:Outputs: Current:Current: PPackage:ackage: 16A16A SMTSMTTTechnical Sechnical Specificationpecification PART NUMBERING SYSTEM The part numbering system for SynQor’s NiQor DC/DC con- verters follows the format shown in the example below. The first 12 characters comprise the base part number and the last 3 characters indicate available options. A “-G” suffix indicates the product is 6/6 RoHS compliant. Application Notes A variety of application notes and technical white papers can be downloaded in pdf format from our website . PATENTS (additional patent applications may be filed) SynQor holds the following patents, one or more of which might apply to this product: 5,999,417 6,222,742 6,545,890 6,577,109 6,594,159 6,731,520 6,894,468 6,896,526 6,927,987 7,050,309 7,072,190 7,085,146

ORDERING INFORMATION

The tables below show the valid model numbers and ordering options for converters in this product family. When ordering SynQor converters, please ensure that you use the complete 15 character part number consisting of the 12 character base part number and the additional 3 characters for options. A “-G” suffix indicates the product is 6/6 RoHS compliant. The following option choices must be included in place of the x y z spaces in the model numbers listed above. Output Max Output Voltage Current NQ16W50SMA16xyz -G 6.0 - 16.0 V 0.75-5.0 V 16 A Model Number Input Voltage P - Pos./Open O - Neg./Open S - Standard S - Sense N - None Options Description: x y z Enable Logic Pin Style Feature Set Warranty SynQor offers a three (3) year limited warranty. Complete warranty information is listed on our website or is available upon request from SynQor. Information furnished by SynQor is believed to be accurate and reliable. However, no responsibility is assumed by SynQor for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SynQor. Contact SynQor for further information: Phone: 978-849-0600 Toll Free: 888-567-9596 Fax: 978-849-0602 E-mail: power@synqor .com Web: www .synqor.com Address: 155 Swanson Road Boxborough, MA 01719 USA NQ 16 W50 S M A 16 P S S - G Product Family Package Size Performance Level Thermal Design Output Current 6/6 RoHS Options (see Ordering Information) Input Voltage Output Voltage