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data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0vdc ? 5.8vdc input; 0.75vdc to 4.0vdc outp ut; 5a output current * ul is a registered trademark of underwriters laboratories, inc. ? csa is a registered trademark of canadian standards association. ? vde is a trademark of verband deutscher elektrotechniker e.v. ** iso is a registered trademark of the international organization of standards document no: ds03-082 ver. 1.34 pdf name: microlynx_smt_3.3v-5v.pdf applications ? distributed power architectures ? intermediate bus voltage applications ? telecommunications equipment ? servers and storage applications ? networking equipment features ? compliant to rohs eu directive 2002/95/ec (-z versions) ? compliant to rohs eu directive 2002/95/ec with lead solder exemption (non-z versions) ? delivers up to 5a output current ? high efficiency ? 94% at 3.3v full load (v in = 5.0v) ? small size and low profile: ? 20.3 mm x 11.4 mm x 5.97 mm ? (0.80 in x 0.45 in x 0.235 in) ? low output ripple and noise ? high reliability: ? calculated mtbf = 19m hours at 25 o c full-load ? constant switching frequency (300 khz) ? output voltage programmable from 0.75 vdc to 4.0vdc via external resistor ? line regulation: 0.3% (typical) ? load regulation: 0.4% (typical) ? temperature regulation: 0.4 % (typical) ? remote on/off ? output overcurrent protection (non-latching) ? wide operating temperature range (-40c to 85c) ? ul * 60950-1recognized, csa ? c22.2 no. 60950-1- 03 certified, and vde ? 0805:2001-12 (en60950-1) licensed ? iso** 9001 and iso 14001 certified manufacturing facilities description the austin microlynx tm smt (surface mount technology) power modules are non-isolated dc-dc converters that can deliver up to 5a of output current with full load efficiency of 94.0% at 3.3v output. these modules provide a precisely regulated output voltage programmable via an external resistor from 0.75vdc to 4.0vdc over a wide range of input voltage (v in = 3.0 ? 5.8vdc). their open-frame construction and small footprint enable designers to develop cost- and space-efficient solutions. standard features include remote on/off, programmable output voltage, overcurrent and overtemperature protection. rohs compliant
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0 v dc output; 5a output current lineage power 2 absolute maximum ratings stresses in excess of the absolute maximum ratings can cause permanent damage to the device. these are absolute stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those given in the operations sections of the data sheet. exposure to absolute maximum ratings for extended periods can adversely affect the device reliability. parameter device symbol min max unit input voltage all v in -0.3 5.8 vdc continuous operating ambient temperature all t a -40 85 c (see thermal considerations section) storage temperature all t stg -55 125 c electrical specifications unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. parameter device symbol min typ max unit operating input voltage v o,set v in ? 0.5v v in 3.0 ? 5.8 vdc maximum input current all i in,max 5.0 adc (v in = v in, min to v in, max , i o =i o, max v o,set = 3.3vdc) input no load current v o,set = 0.75 vdc i in,no load 20 ma (v in = 5.0vdc, i o = 0, module enabled) v o,set = 3.3vdc i in,no load 45 ma input stand-by current all i in,stand-by 0.6 ma (v in = 5.0vdc, module disabled) inrush transient all i 2 t 0.04 a 2 s input reflected ripple current, peak-to-peak (5hz to 20mhz, 1 h source impedance; v in, min to v in, max, i o = i omax ; see test configuration section) all 35 map-p input ripple rejection (120hz) all 30 db caution: this power module is not internally fused. an input line fuse must always be used. this power module can be used in a wide variety of applications, ranging from simple standalone operation to being part of a complex power architecture. to preserve maximum flexibility, internal fusing is not included, however, to achieve maximum safety and system protection, always use an input line fuse. the safety agencies require a fast- acting fuse with a maximum rating of 6 a (see safety considerations section). based on the information provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating can be used. refer to the fuse manufacturer?s data sheet for further information.
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 3 electrical specifications (continued) parameter device symbol min typ max unit output voltage set-point all v o, set ?2.0 ? +2.0 % v o, set (v in = in, min , i o =i o, max , t a =25c) output voltage all v o, set ?3% ? +3% % v o, set (over all operating input voltage, resistive load, and temperature conditions until end of life) adjustment range all v o 0.7525 4.0 vdc selected by an external resistor output regulation line (v in =v in, min to v in, max ) all ? 0.3 % v o, set load (i o =i o, min to i o, max ) all ? 0.4 % v o, set temperature (t ref =t a, min to t a, max ) all ? 0.4 % v o, set output ripple and noise on nominal output (v in =v in, nom and i o =i o, min to i o, max cout = 1 f ceramic//10 ftantalum capacitors) rms (5hz to 20mhz bandwidth) all ? 10 15 mv rms peak-to-peak (5hz to 20mhz bandwidth) all ? 40 50 mv pk-pk external capacitance esr 1 m ? all c o, max ? ? 1000 f esr 10 m ? all c o, max ? ? 3000 f output current all i o 0 ? 5 adc output current limit inception (hiccup mode ) all i o, lim ? 220 ? % i o output short-circuit current all i o, s/c ? 2 ? adc (v o 250mv) ( hiccup mode ) efficiency v o,set = 0.75vdc 79.0 % v in = v in, nom , t a =25c v o, set = 1.2vdc 85.0 % i o =i o, max , v o = v o,set v o,set = 1.5vdc 87.0 % v o,set = 1.8vdc 88.5 % v o,set = 2.5vdc 92.0 % v o,set = 3.3vdc 94.0 % v o,set = 4.0vdc 95.0 % switching frequency all f sw ? 300 ? khz dynamic load response (dio/dt=2.5a/ s; v in = v in, nom ; t a =25c) all v pk ? 130 ? mv load change from io= 50% to 100% of io,max; 1 f ceramic// 10 f tantalum peak deviation settling time (vo<10% peak deviation) all t s ? 25 ? s (dio/dt=2.5a/ s; v in = v in, nom ; t a =25c) all v pk ? 130 ? mv load change from io= 100% to 50%of io,max: 1 f ceramic// 10 f tantalum peak deviation settling time (vo<10% peak deviation) all t s ? 25 ? s
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0 v dc output; 5a output current lineage power 4 electrical specifications (continued) parameter device symbol min typ max unit dynamic load response (dio/dt=2.5a/ s; v v in = v in, nom ; t a =25c) all v pk ? 50 ? mv load change from io= 50% to 100% of io,max; co = 2x150 f polymer capacitors peak deviation settling time (vo<10% peak deviation) all t s ? 50 ? s (dio/dt=2.5a/ s; v in = v in, nom ; t a =25c) all v pk ? 50 ? mv load change from io= 100% to 50%of io,max: co = 2x150 f polymer capacitors peak deviation settling time (vo<10% peak deviation) all t s ? 50 ? s general specifications parameter min typ max unit calculated mtbf (i o =i o, max , t a =25c) 19, 000,000 hours weight ? 2.8 (0.1) ? g (oz.)
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 5 feature specifications unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature conditions. see feature descriptions for additional information. parameter device symbol min typ max unit remote on/off signal interface (v in =v in, min to v in, max ; open collector pnp or equivalent compatible, von/off signal referenced to gnd see feature description section) logic low (on/off voltage pin open - module on) von/off all v il D D 0.4 v ion/off all i il D D 10 a logic high (von/off > 2.5v ? module off) von/off all v ih D D v in v ion/off all i ih D D 1 ma turn-on delay and rise times (i o =i o, max , v in = v in, nom, t a = 25 o c, ) case 1: on/off input is set to logic low (module on) and then input power is applied (delay from instant at which v in =v in, min until vo=10% of vo,set) all tdelay 3.9 msec case 2: input power is applied for at least one second and then the on/off input is set to logic low (delay from instant at which von/off=0.3v until vo=10% of vo, set) all tdelay 3.9 msec output voltage rise time (time for vo to rise from 10% of v o,set to 90% of vo, set) all trise D 4.2 8.5 msec output voltage overshoot ? startup D 1 % v o, set i o = i o, max ; v in = 3.0 to 5.8vdc, t a = 25 o c overtemperature protection all t ref ? 150 ? c (see thermal consideration section) input undervoltage lockout turn-on threshold all ? 2.2 ? v turn-off threshold all ? 2.0 ? v
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 6 characteristic curves the following figures provide typical characteristics for the austin microlynx tm smt modules at 25oc. 70 73 76 79 82 85 88 0 123 45 vin = 5.5v vin = 5.0v vin = 3.0v 70 75 80 85 90 95 012345 vin = 5.5v vin = 5.0v vin = 3.0v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure 1. converter efficiency versus output current (vout = 0.75vdc). figure 4. converter efficiency versus output current (vout = 1.8vdc). 70 75 80 85 90 95 01234 5 vin = 5.5v vin = 5.0v vin = 3.0v 70 75 80 85 90 95 10 0 012345 vin = 5.5v vin = 5.0v vin = 3.0v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure 2. converter efficiency versus output current (vout = 1.2vdc). figure 5. converter efficiency versus output current (vout = 2.5vdc). 70 75 80 85 90 95 0 123 45 vin = 5.5v vin = 5.0v vin = 3.0v 70 75 80 85 90 95 10 0 0 12345 vin = 5.5v vin = 5.0v vin = 4.5v efficiency, (%) output current, i o (a) efficiency, (%) output current, i o (a) figure3. converter efficiency versus output current (vout = 1.5vdc). figure 6. converter efficiency versus output current (vout = 3.3vdc).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 7 characteristic curves the following figures provide typical characteristics for the austin microlynx tm smt modules at 25oc. 70 75 80 85 90 95 100 012345 vin=5.8v vin=5.5v vin=5.0v efficiency, (%) output current, i o (a) figure 7. converter efficiency versus output current (vout = 4.0vdc).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 8 characteristic curves (continued) the following figures provide typical characteristics for the austin microlynx tm smt modules at 25oc. 0 1 2 3 4 5 6 0.5 1.5 2.5 3.5 4.5 5.5 io =0a io =5a io =2.5a input current, i in (a) input voltage, v in ( v ) output current, output voltage i o (a) (2a/div) v o (v) (100mv/div) time , t ( 5 ) figure 8. input voltage vs. input current (vout = 2.5vdc). figure 11. transient response to dynamic load change from 50% to 100% of full load (vo = 3.3vdc). output voltage v o (v) (20mv/div) time, t (2 s/div) output current, output voltage i o (a) (2a/div) v o (v) (100mv/div) time, t (5 s/div) figure 9. typical output ripple and noise (vin = 5.0v dc, vo = 0.75 vdc, io=5a). figure 12. transient response to dynamic load change from 100% to 50% of full load (vo = 3.3 vdc). output voltage v o (v) (20mv/div) time, t (2 s/div) output current, output voltage i o (a) (2a/div) v o (v) (50mv/div) time, t (10 s/div) figure 10. typical output ripple and noise (vin = 5.0v dc, vo = 3.3 vdc, io=5a). figure 13. transient response to dynamic load change from 50% to 100% of full load (vo = 5.0 vdc, cext = 2x150 f polymer capacitors).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 9 characteristic curves (continued) the following figures provide typical characteristics for the austin microlynx tm smt modules at 25oc. output current, outputvoltage i o (a) (2a/div) v o (v) (50mv/div) time, t (10 s/div) output voltage, input voltage v o (v) (1v/div) v in (v) (2v/div) time, t (2 ms/div) figure 14. transient response to dynamic load change from 100% of 50% full load (vo = 5.0 vdc, cext = 2x150 figure 17. typical start-up with application of vin (vin = 5.0vdc, vo = 3.3vdc, io = 5a). output voltage on/off voltage v o v) (1v/div) v on/off (v) (2v/div) time, t (2 ms/div) output voltage on/off voltage v o v) (1v/div) v on/off (v) (2v/div) time, t (2 ms/div) figure 15. typical start-up using remote on/off (vin = 5.0vdc, vo = 3.3vdc, io = 5.0a). figure 18. typical start-up using remote on/off with prebias (vin = 3.3vdc, vo = 1.8vdc, io = 1.0a, vbias =1.0vdc). output voltage on/off voltage v o v) (1v/div) v on/off (v) (2v/div) time, t (2 ms/div) output current, i o (a) (5a/div) time, t (5ms/div) f igure 16. typical start-up using remote on/off with low-esr external capacitors (7x150uf polymer) (vin = 5.0vdc, vo = 3.3vdc, io = 5.0a, co = 1050 f). figure 19. output short circuit current (vin = 5.0vdc, vo = 0.75vdc).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 10 characteristic curves (continued) the following figures provide thermal derating curves for the austin microlynx tm smt modules. 0 1 2 3 4 5 6 20 30 40 50 60 70 80 90 0.5m/s (100 lfm) nc 1.0m/s (200 lfm) 0 1 2 3 4 5 6 20 30 40 50 60 70 80 90 nc 1.0m/s (200 lfm) 0 .5m/ s (10 0 lfm ) output current, io (a) ambient temperature, t a o c output current, io (a) ambient temperature, t a o c figure 20. derating output current versus local ambient temperature and airflow (vin = 5.0, vo=3.3vdc). figure 23. derating output current versus local ambient temperature and airflow (vin = 3.3dc, vo=0.75 vdc). 0 1 2 3 4 5 6 20 30 40 50 60 70 80 90 nc 1.0m/s (200 lfm) 0 .5m/ s ( 10 0 lfm ) output current, io (a) ambient temperature, t a o c figure 21. derating output current versus local ambient temperature and airflow (vin = 5.0vdc, vo=0.75 vdc). 0 1 2 3 4 5 6 20 30 40 50 60 70 80 90 nc 1.0m/s (200 lfm) 0.5m/s (100 lfm) output current, io (a) ambient temperature, t a o c figure 22. derating output current versus local ambient temperature and airflow (vin = 3.3vdc, vo=2.5 vdc).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 11 test configurations to oscilloscope current probe l test 1 h battery c s 1000 f electrolytic e.s.r.<0.1 @ 20c 100khz 2x100 f tantalum v in (+) com note: measure input reflected ripple current with a simulated source inductance (l test ) of 1 h. capacitor c s offsets possible battery impedance. measure current as shown above. c in figure 24. input reflected ripple current test setup. note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. v o (+) com 1uf . resistive load scope copper strip ground plane 10uf figure 25. output ripple and noise test setup. v o com v in (+) com r load r contact r distribution r contact r distribution r contact r contact r distribution r distribution v in v o note: all voltage measurements to be taken at the module terminals, as shown above. if sockets are used then kelvin connections are required at the module terminals to avoid measurement errors due to socket contact resistance. figure 26. output voltage and efficiency test setup. = v o . i o v in . i in x 100 % efficiency design considerations input filtering the austin microlynx tm smt module should be connected to a low-impedance source. a highly inductive source can affect the stability of the module. an input capacitance must be placed directly adjacent to the input pin of the module, to minimize input ripple voltage and ensure module stability. to minimize input voltage ripple, low-esr polymer and ceramic capacitors are recommended at the input of the module. figure 27 shows the input ripple voltage (mvp- p) for various outputs with 1x150 f polymer capacitors (panasonic p/n: eefue0j151r, sanyo p/n: 6tpe150m) in parallel with 1 x 47 f ceramic capacitor (panasonic p/n: ecj-5yb0j476m, taiyo- yuden p/n: cejmk432bj476mmt) at full load. figure 28 shows the input ripple with 2x150 f polymer capacitors in parallel with 2 x 47 f ceramic capacitor at full load. input ripple voltage (mvp-p) 0 20 40 60 80 10 0 12 0 01234 vin = 3.3v v in = 5.0 v output voltage (vdc) figure 27. input ripple voltage for various output with 1x150 f polymer and 1x47 f ceramic capacitors at the input (full load). input ripple voltage (mvp-p) 0 20 40 60 80 10 0 12 0 01234 vin = 3.3v v in = 5.0 v output voltage (vdc) figure 28. input ripple voltage for various output with 2x150 f polymer and 2x47 f ceramic capacitors at the input (full load).
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 12 design considerations (continued) output filtering the austin microlynx tm smt module is designed for low output ripple voltage and will meet the maximum output ripple specification with 1 f ceramic and 10 f tantalum capacitors at the output of the module. however, additional output filtering may be required by the system designer for a number of reasons. first, there may be a need to further reduce the output ripple and noise of the module. second, the dynamic response characteristics may need to be customized to a particular load step change. to reduce the output ripple and improve the dynamic response to a step load change, additional capacitance at the output can be used. low esr polymer and ceramic capacitors are recommended to improve the dynamic response of the module. for stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in the electrical specification table. safety considerations for safety agency approval the power module must be installed in compliance with the spacing and separation requirements of the end-use safety agency standards, i.e., ul 60950-1, csa c22.2 no. 60950-1-03, and vde 0850:2001-12 (en60950-1) licensed. for the converter output to be considered meeting the requirements of safety extra-low voltage (selv), the input must meet selv requirements. the power module has extra-low voltage (elv) outputs when all inputs are elv. the input to these units is to be provided with a fast- acting fuse with a maximum rating of 6a in the positive input lead .
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 13 feature description remote on/off the austin microlynx tm smt power modules feature an on/off pin for remote on/off operation of the module. if not using the remote on/off pin, leave the pin open (module will be on). the on/off pin signal (von/off) is referenced to ground. to switch the module on and off using remote on/off, connect an open collector pnp transistor between the on/off pin and the v in pin (see figure 29). when the transistor q1 is in the off state, the power module is on (logic low on the on/off of the module) and the maximum von/off of the module is 0.4 v. the maximum allowable leakage current of the transistor when von/off = 0.4v and v in = v in,max is 10 a. during a logic-high when the transistor is in the active state, the power module is off. during this state von/off = 2.5v to 5.8v and the maximum ion/off = 1ma. v in (+) gnd enable 20k 14k on/off pin css i on/off q1 lynx-series module figure 29. remote on/off implementation. remote on/off can also be implemented using open- collector logic devices with an external pull-up resistor. figure 30 shows the circuit configuration using this approach. pull-up resistor r pull-up , for the configuration should be 5k (+/- 5%) for proper operation of module over the entire temperature range. q1 r1 r2 q2 css gnd pwm enable on/off vin+ on/off _ + v i module pull-up r on/off figure 30. remote on/off implementation using logic-level devices and an external pull-up resistor. overcurrent protection to provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry and can endure current limiting continuously. at the point of current-limit inception, the unit enters hiccup mode. the unit operates normally once the output current is brought back into its specified range. the typical average output current during hiccup is 2a. input undervoltage lockout at input voltages below the input undervoltage lockout limit, module operation is disabled. the module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. overtemperature protection to provide over temperature protection in a fault condition, the unit relies upon the thermal protection feature of the controller ic. the unit will shutdown if the thermal reference point t ref , exceeds 150 o c (typical), but the thermal shutdown is not intended as a guarantee that the unit will survive temperatures beyond its rating. the module will automatically restart after it cools down.
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 14 feature descriptions (continued) output voltage programming the output voltage of the austin microlynx tm smt can be programmed to any voltage from 0.75 vdc to 4.0 vdc by connecting a single resistor (shown as rtrim in figure 31) between the trim and gnd pins of the module. without an external resistor between trim pin and the ground, the output voltage of the module is 0.75 vdc. to calculate the value of the resistor rtrim for a particular output voltage vo, use the following equation: ? ? ? ? ? ? ? ? = 5110 7525 . 0 21070 vo rtrim for example, to program the output voltage of the austin microlynx tm module to 1.8 vdc, rtrim is calculated is follows: ? ? ? ? ? ? ? ? = 5110 7525 . 0 8 . 1 21070 rtrim = k rtrim 004 . 15 v o (+) trim gnd r trim load v in (+) on/off vout figure 31. circuit configuration for programming output voltage using an external resistor. the austin microlynx tm can also be programmed by applying a voltage between the trim and the gnd pins (figure 32). the following equation can be used to determine the value of vtrim needed to obtain a desired output voltage vo: {} () 7525 . 0 1698 . 0 7 . 0 ? ? = vo vtrim for example, to program the output voltage of a microlynx tm module to 3.3 vdc, vtrim is calculated as follows: {} ) 7525 . 0 3 . 3 1698 . 0 7 . 0 ( ? ? = vtrim v vtrim 2670 . 0 = v o (+) trim gnd v t rim load v in (+) on/off + - figure 32. circuit configuration for programming output voltage using external voltage source. table 1 provides rtrim values required for some common output voltages, while table 2 provides values of the external voltage source, vtrim for the same common output voltages. table 1 v o, set (v) rtrim ( k ? ) 0.7525 open 1.2 41.973 1.5 23.077 1.8 15.004 2.5 6.947 3.3 3.160 table 2 v o, set (v) vtrim (v) 0.7525 open 1.2 0.6240 1.5 0.5731 1.8 0.5221 2.5 0.4033 3.3 0.2674 by using a 1% tolerance trim resistor, set point tolerance of 2% is achieved as specified in the electrical specification. the pol programming tool, available at www.lineagepower.com under the design tools section, helps determine the required external trim resistor needed for a specific output voltage.
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 15 feature description (continued) voltage margining output voltage margining can be implemented in the austin microlynx tm modules by connecting a resistor, r margin-up , from the trim pin to the ground pin for margining-up the output voltage and by connecting a resistor, r margin-down , from the trim pin to the output pin for margining-down. figure 31 shows the circuit configuration for output voltage margining. the pol programming tool, available at www.lineagepower.com under the design tools section, also calculates the values of r margin-up and r margin-down for a specific output voltage and % margin. please consult your local lineage power technical representative for additional details. vo austin lynx or lynx ii series gnd trim q1 rtrim rmargin-up q2 rmargin-down figure 33. circuit configuration for margining output voltage.
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 16 thermal considerations power modules operate in a variety of thermal environments; however, sufficient cooling should always be provided to help ensure reliable operation. considerations include ambient temperature, airflow, module power dissipation, and the need for increased reliability. a reduction in the operating temperature of the module will result in an increase in reliability. the thermal data presented here is based on physical measurements taken in a wind tunnel. note that the airflow is parallel to the long axis of the module as shown in figure 34. the test set-up is shown in figure 35. the derating data applies to airflow in either direction of the module?s long axis. air flow t ref to p view bottom view figure 34. t ref temperature measurement location. the thermal reference point, t ref used in the specifications is shown in figure 34. for reliable operation this temperature should not exceed 115 o c. figure 35. thermal test set-up. heat transfer via convection increased airflow over the module enhances the heat transfer via convection. thermal derating curves showing the maximum output current that can be delivered at different local ambient temperatures (t a ) for airflow conditions ranging from natural convection and up to 1m/s (200 ft./min) are shown in the characteristics curves section. the output power of the module should not exceed the rated power of the module (vo,set x io,max). please refer to the application note ?thermal characterization process for open-frame board- mounted power modules? for a detailed discussion of thermal aspects including maximum device temperatures. a ir flow x po w e r m o d u le w ind tunne l pwbs 5.97_ (0.235) 76.2_ (3.0) probe location for measuring airflow and ambient temperature 25.4_ (1.0)
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 17 mechanical outline dimensions are in millimeters and (inches). tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.) co-planarity (max): 0.004 (0.102)
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 18 recommended pad layout dimensions are in millimeters and (inches). tolerances: x.x mm 0.5 mm (x.xx in. 0.02 in.) [unless otherwise indicated] x.xx mm 0.25 mm (x.xxx in 0.010 in.)
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 19 packaging details the austin microlynx tm smt version is supplied in tape & reel as standard. modules are shipped in quantities of 500 modules per reel. all dimensions are in millimeters and (in inches). reel dimensions: outside dimensions: 330.2 mm (13.00) inside dimensions: 177.8 mm (7.00?) tape width: 44.00 mm (1.732?)
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4. 0vdc output; 5a output current lineage power 20 surface mount information pick and place the austin microlynx tm smt modules use an open frame construction and are designed for a fully automated assembly process. the modules are fitted with a label designed to provide a large surface area for pick and place operations. the label meets all the requirements for surface mount processing, as well as safety standards, and is able to withstand reflow temperatures of up to 300 o c. the label also carries product information such as product code, serial number and the location of manufacture. all dimensions are in millimeters and (inches). figure 36. pick and place location. nozzle recommendations the module weight has been kept to a minimum by using open frame construction. even so, these modules have a relatively large mass when compared to conventional smt compon ents. variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. the minimum recommended nozzle diameter for reliable operation is 6mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 9 mm. oblong or oval nozzles up to 11 x 9 mm may also be used within the space available. reflow soldering information the austin microlynx tm smt power modules are large mass, low thermal resistance devices and typically heat up slower than other smt components. it is recommended that the customer review data sheets in order to customize the solder reflow profile for each application board assembly. the following instructions must be observed when soldering these units. failure to observe these instructions may result in the failure of or cause damage to the modules, and can adversely affect long-term reliability. typically, the eutectic solder melts at 183 o c, wets the land, and subsequently wicks the device connection. sufficient time must be allowed to fuse the plating on the connection to ensure a reliable solder joint. there are several types of smt reflow technologies currently used in the industry. these surface mount power modules can be reliably soldered using natural forced convection, ir (radiant infrared), or a combination of convection/ir. for reliable soldering the solder reflow profile should be established by accurately measuring the modules pin temperatures. figure 37. reflow profile. an example of a reflow profile (using 63/37 solder) for the austin microlynx tm smt power module is : ? pre-heating zone: room temperature to 183 o c (2.0 to 4.0 minutes maximum) ? initial ramp rate < 2.5 o c per second ? soaking zone: 155 o c to 183 o c ? 60 to 90 seconds typical (2.0 minutes maximum) ? reflow zone ramp rate:1.3 o c to 1.6 o c per second ? reflow zone: 210 o c to 235 o c peak temperature ? 30 to 60 seconds (90 seconds maximum
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 21 surface mount information (continued) lead free soldering the ?z version austin microlynx smt modules are lead-free (pb-free) and rohs compliant and are both forward and backward compatible in a pb-free and a snpb soldering process. failure to observe the instructions below may result in the failure of or cause damage to the modules and can adversely affect long-term reliability. pb-free reflow profile power systems will comply with j-std-020 rev. c (moisture/reflow sensitivity classification for nonhermetic solid state surface mount devices) for both pb-free solder profiles and msl classification procedures. this standard provides a recommended forced-air-convection reflow profile based on the volume and thickness of the package (table 4-2). the suggested pb-free solder paste is sn/ag/cu (sac). the recommended linear reflow profile using sn/ag/cu solder is shown in fig. 38. msl rating the austin microlynx smt modules have a msl rating of 1. storage and handling the recommended storage environment and handling procedures for moisture-sensitive surface mount packages is detailed in j-std-033 rev. a (handling, packing, shipping and use of moisture/reflow sensitive surface mount devices). moisture barrier bags (mbb) with desiccant are required for msl ratings of 2 or greater. these sealed packages should not be broken until time of use. once the original package is broken, the floor life of the product at conditions of 30c and 60% relative humidity varies according to the msl rating (see j-std-033a). the shelf life for dry packed smt packages will be a minimum of 12 months from the bag seal date, when stored at the following conditions: < 40 c, < 90% relative humidity . post solder cleaning and drying considerations post solder cleaning is usually the final circuit-board assembly process prior to electrical board testing. the result of inadequate cleaning and drying can affect both the reliability of a power module and the testability of the finished circuit-board assembly. for guidance on appropriate soldering, cleaning and drying procedures, refer to board mounted power modules: soldering and cleaning application note (an04-001). per j-std-020 rev. c 0 50 100 150 200 250 300 reflow time (seconds) reflow temp (c) heating zone 1c/second peak temp 260c * min. time above 235c 15 seconds *time above 217c 60 seconds cooling zone figure 38. recommended linear reflow profile using sn/ag/cu solder.
data sheet june 24, 2008 austin microlynx tm smt non-isolated power modules: 3.0 ? 5.8vdc input; 0.75vdc to 4.0vdc output; 5a output current lineage power 22 document no: ds03-082 ver. 1.34 pdf name: microlynx_smt_3.3v-5v.pdf ordering information please contact your lineage power sales representative for pricing, availability and optional features. table 3. device codes product codes input voltage output voltage output current efficiency 3.3v @ 5a connector type comcode AXH005A0X-SR 3.0 ? 5.8 vdc 0.75 ? 4.0 vdc 5a 94.0% smt 108979667 AXH005A0X-SRz 3.0 ? 5.8 vdc 0.75 ? 4.0 vdc 5a 94.0% smt 109100518 -z refers to rohs-compliant parts world wide headquarters lineage power corporation 3000 skyline drive, mesquite, tx 75149, usa +1-800-526-7819 (outside u.s.a.: +1-972-284-2626 ) www.lineagepower.com e-mail: techsupport1@lineagepower.com asia-pacific headquarters tel: +65 6416 4283 europe, middle-east and africa headquarters tel: +49 89 6089 286 india headquarters tel: +91 80 28411633 lineage power reserves the right to make changes to the product(s) or information contained herein without notice. no liability is assumed as a result of their use or application. no rights under any patent accompany the sale of any such product(s) or information. ? 2008 lineage power corporation, (mesquite, texas) all international rights reserved.

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