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data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a 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: ds06-131 ver. 1.09 pdf name: apth003a0x_ds.pdf applications ? distributed power architectures ? intermediate bus voltage applications ? telecommunications equipment ? servers and storage applications ? networking equipment ? industrial equipment features ? compliant to rohs eu directive 2002/95/ec (z versions) ? compatible in a pb-free or snpb reflow environment (z versions) ? wide input voltage range (2.4vdc-5.5vdc) ? output voltage programmabl e from 0.6vdc to 3.63 vdc via external resistor ? tunable loop tm to optimize dynamic output voltage response ? flexible output voltage sequencing ez- sequence ? apth versions ? remote sense ? fixed switching frequency ? output overcurrent protection (non-latching) ? overtemperature protection ? remote on/off ? ability to sink and source current ? cost efficient open frame design ? small size: 12.2 mm x 12.2 mm x 6.25 mm (0.48 in x 0.48 in x 0.25 in) ? 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 pico tlynx tm 3a power modules are non-isolated dc-dc converte rs that can deliver up to 3a of output current. these modules operate over a wide range of input voltage (v in = 2.4vdc-5.5vdc) and provide a precisely regulated output voltage from 0.6vdc to 3.63vdc, programmable via an external resistor . features include remote on/off, adjustable output voltage, over curr ent and overtemperature protection, and output voltage sequencing (apth versions). a new feature, the tunable loop tm , allows the user to optimize the dynamic response of the converter to match the load with reduced amount of output c apacitance leading to savings on cost and pwb area. trim vout sense gnd ctune rtune rtrim vin co cin vin+ vout+ on/off q1 seq module rohs compliant ez-sequence tm
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 2 absolute maximum ratings stresses in excess of the absolute maximum ratings ca n cause permanent damage to the device. these are absolute stress ratings only, functional operation of the dev ice is not implied at these or any other conditions in excess of those given in the operati ons sections of the data sheet. exposu re 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 6 vdc continuous sequencing voltage apth v seq -0.3 v in, max vdc 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, specificati ons apply over all operating input vo ltage, resistive load, and temperature conditions. parameter device symbol min typ max unit operating input voltage all v in 2.4 ? 5.5 vdc maximum input current all i in,max 3.5 adc (v in =2.4v to 5.5v, i o =i o, max ) input no load current v o,set = 0.6 vdc i in,no load 26 ma (v in = 5.0vdc, i o = 0, module enabled) v o,set = 3.3vdc i in,no load 75 ma input stand-by current all i in,stand-by 2.1 ma (v in = 5.0vdc, module disabled) inrush transient all i 2 t 1 a 2 s input reflected ripple current, peak-to-peak (5hz to 20mhz, 1 h source impedance; v in =0 to 5.5v , i o = i omax ; see test configurations) all 25 map-p input ripple rejection (120hz) all 40 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 an integrated part of sophist icated power architecture. to preserve maximum flexibility, internal fusing is not included; however, to achieve maximum safety and system protec tion, always use an input line fuse. the safety agencies require a fast-acting fuse with a maximum rating of 5a (s ee safety considerations section). based on the information provided in this data sheet on inrush energy and maximum dc in put current, the same type of fuse with a lower rating can be used. refer to the fuse manufactu rer?s data sheet for further information.
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 3 electrical specifications (continued) parameter device symbol min typ max unit output voltage set-point (with 0.5% tolerance for external resistor used to set output voltage) all v o, set -1.5 +1.5 % v o, set output voltage all v o, set -3.0 ? +3.0 % v o, set (over all operating input voltage, resistive load, and temperature conditions until end of life) adjustment range all v o 0.6 3.63 vdc selected by an external resistor output regulation (for v o 2.5vdc) line (v in =v in, min to v in, max ) all ? +0.4 % v o, set load (i o =i o, min to i o, max ) all ? 10 mv output regulation (for v o < 2.5vdc) line (v in =v in, min to v in, max ) all ? 10 mv load (i o =i o, min to i o, max ) all ? 5 mv temperature (t ref =t a, min to t a, max ) all ? 0.4 % v o, set remote sense range all 0.5 v output ripple and noise on nominal output (v in =v in, nom and i o =i o, min to i o, max co = 0.1 f // 10 f ceramic capacitors) peak-to-peak (5hz to 20mhz bandwidth) all ? 20 35 mv pk-pk rms 15 25 mv rms external capacitance 1 without the tunable loop tm esr 1 m ? all c o, max 0 ? 47 f with the tunable loop tm esr 0.15 m ? all c o, max 0 ? 1000 f esr 10 m ? all c o, max 0 ? 3000 f output current all i o 0 3 adc output current limit inception (hiccup mode ) all i o, lim 200 % i o,max output short-circuit current all i o, s/c 0.12 adc (v o 250mv) ( hiccup mode ) efficiency v o,set = 0.6vdc 81.2 % v in = 3.3vdc, t a =25c v o, set = 1.2vdc 89.4 % i o =i o, max , v o = v o,set v o,set = 1.8vdc 91.4 % v o,set = 2.5vdc 93.9 % v in = 5vdc v o,set = 3.3vdc 94.4 % switching frequency all f sw ? 600 ? khz dynamic load response (dio/dt=10a/ s; v in = 5v; v out = 1.5v, t a =25c) load change from io= 0% to 50% of io,max; co = 0 peak deviation all v pk 90 mv settling time (vo<10% peak deviation) all t s 20 s load change from io= 50% to 0% of io,max: co = 0 peak deviation all v pk 100 mv settling time (vo<10% peak deviation) all t s 20 s 1 external capacitors may require using the new tunable loop tm feature to ensure that the module is stable as well as getting the best transient response. see the tunable loop tm section for details.
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 4 general specifications parameter min typ max unit calculated mtbf (i o =0.8i o, max , t a =40c) telcordia issue 2 method 1 case 3 16,139,760 hours weight ? 1.55 (0.0546) ? g (oz.) feature specifications unless otherwise indicated, specificati ons apply over all operating input vo ltage, resistive load, and temperature conditions. see feature descriptions for additional information. parameter device symbol min typ max units on/off signal interface (v in =v in, min to v in, max ; open collector or equivalent, signal referenced to gnd) device is with suffix ?4? ? positive logic (see ordering information) logic high (module on) input high current all i ih ? 10 a input high voltage all v ih 1.2 ? v in,max v logic low (module off) input low current all i il ? ? 0.3 ma input low voltage all v il -0.3 ? 0.3 v device code with no suffix ? negative logic (see ordering information) (on/off pin is open collector/drain logic input with external pull-up resistor; signal referenced to gnd) logic high (module off) input high current all i ih D D 1 ma input high voltage all v ih v in ? 0.8 D v in, max vdc logic low (module on) input low current all i il D D 0.2 ma input low voltage all v il -0.2 D v in ? 1.6 vdc turn-on delay and rise times (v in =v in, nom , i o =i o, max , v o to within 1% of steady state) case 1: on/off input is enabled and then input power is applied (delay from instant at which v in = v in, min until v o = 10% of v o, set ) all tdelay D 2 D msec case 2: input power is applied for at least one second and then the on/off input is enabled (delay from instant at which von/off is enabled until v o = 10% of v o, set ) all tdelay D 2 D msec output voltage rise time (time for v o to rise from 10% of vo, set to 90% of vo, set) all trise D 5 D msec output voltage overshoot (t a = 25 o c 3.0 % v o, v in = v in, min to v in, max ,i o = i o, min to i o, max ) with or without maximum external capacitance over temperature protection all t ref 140 c (see thermal considerations section) sequencing delay time delay from v in, min to application of voltage on seq pin apth ts eq-delay 10 msec tracking accuracy (power-up: 2v/ms) apth v seq ?v o 100 mv (power-down: 2v/ms) apth v seq ?v o 100 mv (v in, min to v in, max ; i o, min to i o, max v seq < v o )
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 5 feature specifications (cont.) parameter device symbol min typ max units input undervoltage lockout turn-on threshold all 2.2 vdc turn-off threshold all 1.75 vdc hysteresis all 0.08 0.2 vdc
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 6 characteristic curves the following figures provide typical characteristics for the pico tlynx tm 3a modules at 0.6vo and at 25 o c. 70 72 74 76 78 80 82 84 86 00.511.522.53 vin=5.5v vin=2.4v vin=3.3v 0 0.5 1 1. 5 2 2.5 3 3.5 20 30 40 50 60 70 80 90 0 lfm efficiency, (%) output current, i o (a) output current, io (a) ambient temperature, t a o c figure 1. converter efficiency versus output current. figure 2. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) time, t (1 s/div) output current, output voltage i o (a) (1adiv) v o (v) (100mv/div) time, t (20 s /div) figure 3. typical output ripple and noise (v in = 5v, i o = i o,max ). figure 4. transient response to dynamic load change from 0% to 50% to 0% with v in =5v. on/off voltage output voltage v on/off (v) (2v/div) v o (v) (200mv/div) time, t (1ms/div) input voltage output voltage v in (v) (2v/div) v o (v) (200mv/div) time, t (1ms/div) figure 5. typical start-up using on/off voltage (i o = i o,max ). figure 6. typical start-up using input voltage (v in = 5v, i o = i o,max ).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 7 characteristic curves (continued) the following figures provide typical characteristics for the pico tlynx tm 3a modules at 1.2vo and at 25 o c. 70 75 80 85 90 95 0 0.5 1 1.5 2 2.5 3 vin=5.5v vin=2.4v vin=3.3v 0 0.5 1 1. 5 2 2.5 3 3.5 20 30 40 50 60 70 80 90 0 lfm efficiency, (%) output current, i o (a) output current, io (a) ambient temperature, t a o c figure 7. converter efficiency versus output current. figure 8. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) time, t (1 s/div) output current, output voltage i o (a) (1adiv) v o (v) (100mv/div) time, t (20 s /div) figure 9. typical output ripple and noise (v in = 5v, i o = i o,max ). figure 10. transient response to dynamic load change from 0% to 50% to 0% with v in =5v. on/off voltage output voltage v on/off (v) (2v/div) v o (v) (500mv/div) time, t (1ms/div) input voltage output voltage v in (v) (2v/div) v o (v) (500mv/div) time, t (1ms/div) figure 11. typical start-up using on/off voltage (i o = i o,max ). figure 12. typical start-up using input voltage (v in = 5v, i o = i o,max ).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 8 characteristic curves (continued) the following figures provide typical characteristics for the pico tlynx tm 3a modules at 1.8vo and at 25 o c. 70 75 80 85 90 95 00.511.522.53 vin=5.5v vin=2.4v vin=3.3v 0 0.5 1 1. 5 2 2.5 3 3.5 20 30 40 50 60 70 80 90 0 lfm efficiency, (%) output current, i o (a) output current, io (a) ambient temperature, t a o c figure 13. converter efficiency versus output current. figure 14. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) time, t (1 s/div) output current, output voltage i o (a) (2adiv) v o (v) (200mv/div) time, t (20 s /div) figure 15. typical output ripple and noise (v in = 5v, i o = i o,max ). figure 16. transient response to dynamic load change from 0% to 50% to 0% with v in =5v. on/off voltage output voltage v on/off (v) (2v/div) v o (v) (500mv/div) time, t (1ms/div) input voltage output voltage v in (v) (2v/div) v o (v) (1v/div) time, t (1ms/div) figure 17. typical start-up using on/off voltage (i o = i o,max ). figure 18. typical start-up using input voltage (v in = 5v, i o = i o,max ).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 9 characteristic curves (continued) the following figures provide typical characteristics for the pico tlynx tm 3a modules at 2.5vo and at 25 o c. 70 75 80 85 90 95 100 00.5 11.522.53 vin=5.5v vin=3v vin=3.3v 0 0.5 1 1. 5 2 2.5 3 3.5 20 30 40 50 60 70 80 90 0 lfm efficiency, (%) output current, i o (a) output current, io (a) ambient temperature, t a o c figure 19. converter efficiency versus output current. figure 20. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) time, t (1 s/div) output current, output voltage i o (a) (2adiv) v o (v) (200mv/div) time, t (20 s /div) figure 21. typical output ripple and noise (v in = 5v, i o = i o,max ). figure 22. transient response to dynamic load change from 0% to 50% to 0% with v in =5v. on/off voltage output voltage v on/off (v) (5v/div) v o (v) (1v/div) time, t (1ms/div) input voltage output voltage v in (v) (2v/div) v o (v) (1v/div) time, t (1ms/div) figure 23. typical start-up using on/off voltage (i o = i o,max ). figure 24. typical start-up using input voltage (v in = 5v, i o = i o,max ).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 10 characteristic curves (continued) the following figures provide typical characteristics for the pico tlynx tm 3a modules at 3.3vo and at 25 o c. 70 75 80 85 90 95 100 00.5 11.522.53 vin=5.5v vin=4v vin=5v 0 0.5 1 1. 5 2 2.5 3 3.5 20 30 40 50 60 70 80 90 0 lfm efficiency, (%) output current, i o (a) output current, io (a) ambient temperature, t a o c figure 25. converter efficiency versus output current. figure 26. derating output current versus ambient temperature and airflow. output voltage v o (v) (20mv/div) time, t (1 s/div) output current, output voltage i o (a) (1adiv) v o (v) (200mv/div) time, t (20 s /div) figure 27. typical output ripple and noise (v in = 5v, i o = i o,max ). figure 28. transient response to dynamic load change from 0% 50 % to 0% with v in =5v. on/off voltage output voltage v on/off (v) (2v/div) v o (v) (1v/div) time, t (1ms/div) input voltage output voltage v in (v) (2v/div) v o (v) (1v/div) time, t (1ms/div) figure 29. typical start-up using on/off voltage (i o = i o,max ). figure 30. typical start-up using input voltage (v in = 5v, i o = i o,max ).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a 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 31. 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. vo+ com 0.1uf resistive load scope u sing bnc socket copper strip ground plane 10uf figure 32. 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 33. output voltage and efficiency test setup. = v o . i o v in . i in x 100 % efficiency design considerations input filtering the pico tlynx tm 3a module should be connected to a low ac-impedance source. a highly inductive source can affect the stab ility 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 voltag e ripple, low-esr ceramic capacitors are recommended at the input of the module. figure 34 shows the input ripple voltage for various output voltages at 3a of load current with 1x22 f or 2x22 f ceramic capacitors and an input of 5v. figure 35 shows data for the 3.3vin case, with 1x22f or 2x22f of ceramic capacitors at the input. input ripple voltage (mvp-p) 0 10 20 30 40 50 60 0.51 1.522.533.5 1x22uf 2x22uf output voltage (vdc) figure 34. input ripple voltage for various output voltages with 1x22 f or 2x22 f ceramic capacitors at the input (3a load). input voltage is 5v. input ripple voltage (mvp-p) 0 10 20 30 40 50 60 0.511.522.53 1x22uf 2x22uf output voltage (vdc) figure 35. input ripple voltage in mv, p-p for various output voltages with 1x22 f or 2x22 f ceramic capacitors at the input (3a load). input voltage is 3.3v.
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 12 output filtering the pico tlynx tm 3a modules are designed for low output ripple voltage and will meet the maximum output ripple specification with 0.1 f ceramic and 10 f ceramic capacitors at t he output of the module. however, additional output f iltering 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 ceramic and polymer capacitors are recommended to improve the dynamic response of the module. figure 36 provides output ripple information for different external capacitance values at various vo and for load currents of 3a while maintaining an input voltage of 5v. fig 37 shows the performance with a 3.3v input. for stable operation of the module, limit the capacitance to less than the maximum output capacitance as specified in th e electrical specification table. optimal performance of the module can be achieved by using the tunab le loop feature described later in this data sheet. 0 5 10 15 20 25 30 0.511.522.533.5 output voltage(volts) ripple(mvp-p) 1x10uf external cap 1x47uf external cap 2x47uf external cap 4x47uf external cap figure 36. output ripple voltage for various output voltages with external 1x10 f, 1x47 f, 2x47 f or 4x47 f ceramic capacitors at the output (3a load). input voltage is 5v. 0 5 10 15 20 0.511.522.53 output voltage(volts) ripple(mvp-p) 1x10uf external cap 1x47uf external cap 2x47uf external cap 4x47uf external cap figure 37. output ripple voltage for various output voltages with external 1x10 f, 1x47 f, 2x47 f or 4x47 f ceramic capacitors at the output (3a load). input voltage is 3.3v. 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 5a in the positive input lead . feature descriptions remote on/off the pico tlynx tm 3a modules feature an on/off pin for remote on/off operation. two on/off logic options are available. in the po sitive logic on/off option, (device code suffix ?4?- see ordering information), the module turns on during a logic high on the on/off pin and turns off during a logic low. with the negative logic on/off option, (no device code suffix, see ordering information), the module turns off during logic high and on during logic low. the on/off signal is always referenced to gr ound. for either on/off logic option, leaving the on/off pin disconnected will turn the module on when input voltage is present. for positive logic modules, the circuit configuration for using the on/off pin is show n in figure 38. when the external transistor q1 is in the off state, q2 is on, the internal pwm enable signal is pulled low and the
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 13 module is on. when transistor q1 is turned on, the on/off pin is pulled low, q2 is turned off and the internal pwm enable signal is pulled high through the 100k internal pull-up resistor and the module is off. figure 38. circuit configuration for using positive on/off logic. for negative logic on/off modules, the circuit configuration is shown in fig. 39. the on/off pin should be pulled high with an external pull-up resistor (suggested value for the 2.4v to 5.5vin range is 3.6kohms). when transistor q1 is in the off state, the on/off pin is pulled high and the module is off. the on/off threshold for logic high on the on/off pin depends on the input voltage and its minimum value is v in ? 1.6v. to turn the module on, q1 is turned on pulling the on/off pin low. 100k q1 gnd pwm enable on/off vin+ on/off _ + v i module rpullup on/off 2.05k 20k figure 39. circuit configuration for using negative on/off logic. overcurrent protection to provide protection in a fault (output overload) condition, the unit is equipped with internal current-limiting circuitry a nd 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. overtemperature protection to provide protection in a fault condition, the unit is equipped with a thermal shutdown circuit. the unit will shutdown if the overtemperature threshold of 140 o c is exceeded at the thermal reference point t ref . the thermal shutdown is not in tended as a guarantee that the unit will survive temperatures beyond its rating. once the unit goes into thermal shutdown it will then wait to cool before attempting to restart. input undervoltage lockout at input voltages below the input undervoltage lockout limit, the module operation is disabled. the module will begin to operate at an input voltage above the undervoltage lockout turn-on threshold. output voltage programming the output voltage of the pico tlynx tm 3a modules can be programmed to any voltage from 0.6vdc to 3.63vdc by connecting a resistor between the trim and gnd pins of the module. certain restrictions apply on the output voltage set poi nt depending on the input voltage. these are shown in the output voltage vs. input voltage set point area plot in fig. 40. the upper limit curve shows that the entire output voltage range is available with the maximum input voltage of 5.5v. the lower limit curve shows that for output voltages of 1.8v and higher, the input voltage needs to be larger than the minimum of 2.4v. 0 1 2 3 4 5 6 0.511.522.533.54 output voltage (v) input voltage (v) upper limit lower limit figure 40. output voltage vs. input voltage set point area plot showing limits where the output voltage can be set for different input voltages. without an external resistor between trim and gnd pins, the output of the module will be 0.6vdc. to calculate the value of the trim resistor, rtrim for a desired output voltage, use the following equation: () ? ? ? ? ? ? ? = k vo rtrim 6 . 0 2 . 1 100k q1 gnd pwm enable on/off vin+ on/off _ + i v module on/off 20k q2 20k
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 14 rtrim is the external resistor in k ? vo is the desired output voltage. table 1 provides rtrim values required for some common output voltages. table 1 v o, set (v) rtrim ( k ? ) 0.6 open 1.0 3.0 1.2 2.0 1.5 1.333 1.8 1.0 2.5 0.632 3.3 0.444 by using a 0.5% tolerance trim resistor with a tc of 25ppm, a set point tolerance of 1.5% can be achieved as specified in the electrical specification. the pol programming tool available at www.lineagepower.com under the design tools section, helps determine t he required trim resistor needed for a specific output voltage. v o + trim gnd r trim load v in + on/off sense figure 41. circuit configuration for programming output voltage using an external resistor. remote sense the pico tlynx tm 3a modules have a remote sense feature to minimize the effe cts of distribution losses by regulating the voltage at the sense pin. the voltage between the sense pin and vout pin must not exceed 0.5v. note that t he output voltage of the module cannot exceed the specified maximum value. this includes the voltage drop between the sense and vout pins. when the remote sense feature is not being used, connect the sense pin to the vout pin . voltage margining output voltage margining can be implemented in the pico tlynx tm 3a 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 output pin for margining-down. figure 42 shows the circuit configuration for output volt age 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 module gnd trim q1 rtrim rmargin-up q2 rmargin-down figure 42. circuit configuration for margining output voltage monotonic start-up and shutdown the pico tlynx tm 3a modules have monotonic start- up and shutdown behavior for any combination of rated input voltage, output current and operating temperature range. startup into pre-biased output the 5.5v pico tlynx tm 6a modules can start into a prebiased output as long as the prebias voltage is 0.5v less than the set output volt age. note that prebias operation is not supported when output voltage sequencing is used. output voltage sequencing the pico tlynx tm modules include a sequencing feature, ez-sequence t hat enables users to implement various types of output voltage sequencing in their applications. this is accomplished via an additional sequencing pin. when not using the sequencing feature, either tie the seq pin to v in or leave it unconnected. when an analog voltage is applied to the seq pin, the output voltage tracks this voltage until the output reaches the set-point voltage. the final value of the seq voltage must be set higher than the set-point voltage of the module. t he output voltage follows the
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 15 voltage on the seq pin on a one-to-one volt basis. by connecting the seq pins of multiple modules together, all modules can track their output voltages to the voltage applied on the seq pin. for proper voltage sequencing, first, input voltage is applied to the module. the on/off pin of the module is left unconnected (or tied to gnd for negative logic modules or tied to v in for positive logic modules) so that the module is on by default. after applying input voltage to the module, a minimum 10msec delay is required before applying voltage on the seq pin. this delay gives the module enough time to complete its internal power-up soft-start cycle. during the delay time, the seq pin should be held close to ground (nominally 50mv 20 mv). this is required to keep the internal op-amp out of saturation thus preventing output overshoot during the start of the sequencing ramp. by selecting resistor r1 (see fig. 43) according to the following equation 05 . 0 24950 1 ? = in v r ohms, the voltage at the sequencing pin will be 50mv when the sequencing signal is at zero. r1 gnd vin+ seq + - out 10k 499k module figure 43. circuit showing connection of the sequencing signal to the seq pin. after the 10msec delay, an analog voltage is applied to the seq pin and the output voltage of the module will track this voltage on a one- to-one volt bases until the output reaches the set-point voltage. to initiate simultaneous shutdown of the modules, the seq pin voltage is lowered in a controlled manner. the output voltage of the modules tracks the voltages below their set-point voltages on a one-to-one basis. a valid input voltage must be maintained until the tracking and output voltages reach ground potential. when using the ez-sequence tm feature to control start-up of the module, pre- bias immunity during start- up is disabled. the pre-bias immunity feature of the module relies on the module being in the diode-mode during start-up. when using the ez-sequence tm feature, modules goes through an internal set-up time of 10msec, and will be in synchronous rectification mode when the voltage at the seq pin is applied. this will result in the module sinking current if a pre-bias voltage is present at the output of the module. when pre-bias immunity during start-up is required, the ez- sequence tm feature must be disabled. for additional guidelines on using the ez-sequence tm feature please refer to application note an04-008 ?application guidelines for non-isolated converters: guidelines for sequencing of multiple modules?, or contact the lineage power technical representative for additional information. tunable loop the 5v pico tlynx tm 3a modules have a new feature that optimizes transient resp onse of the module called tunable loop tm . external capacitors are usua lly added to the output of the module for two reasons: to reduce output ripple and noise (see figures 36 and 37) and to reduce output voltage deviations from the steady-state value in the presence of dynamic load current changes. adding external capacitance however affects the voltage control loop of t he module, typically causing the loop to slow down with sluggish response. larger values of external capacitance could also cause the module to become unstable. the tunable loop tm allows the user to externally adjust the voltage control lo op to match the filter network connected to the output of the module. the tunable loop is implemented by connecting a series r-c between the sense and trim pins of the module, as shown in fig. 44. this r-c allows the user to externally adjust the voltage loop feedback compensation of the module. figure. 44. circuit diagram showing connection of r tume and c tune to tune the control loop of the module. module vout sense trim gnd rtune ctune rtrim c o
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 16 recommended values of r tune and c tune for different output capacitor combinations are given in tables 2, 3, 4 and 5. tables 2 and 4 show the recommended values of r tune and c tune for different values of ceramic output capacitors up to 470uf that might be needed for an application to meet output ripple and noise requirements for 5vin and 3.3vin respectively. selecting r tune and c tune according to table 2 will ensure stable operation of the module. in applications with tight output voltage limits in the presence of dynamic current loading, additional output capacitance will be required. tables 3 and 5 list recommended values of r tune and c tune in order to meet 2% output voltage deviation limits for some common output voltages in the presence of a 1.5a to 3a step change (50% of full load), with an input voltage of 5vin and 3.3vin respectively please contact your lineage power technical representative to obtain more details of this feature as well as for guidelines on how to select the right value of external r-c to tune the module for best transient performance and stable oper ation for other output capacitance values or input voltages other than 3.3 or 5v. table 2. general recommended values of of r tune and c tune for vin=5v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 4x47 f 6x47 f 10x47 f r tune 33 33 33 33 33 c tune 6800pf 15nf 33nf 47nf 56nf table 3. recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 1.5a step load with vin=5v. vo 3.3v 2.5v 1.8v 1.2v 0.6v co 1 x 47 f 2 x 47 f 2 x 47 f 4 x 47 f 2 x 47 f +330 f polymer r tune 33 33 33 33 33 c tune 6800pf 15nf 15nf 33nf 82nf v 59mv 35mv 35mv 21mv 12mv table 4. general recommended values of of r tune and c tune for vin=3.3v and various external ceramic capacitor combinations. co 1x47 f 2x47 f 4x47 f 6x47 f 10x47 f r tune 33 33 33 33 33 c tune 15nf 27nf 47nf 56nf 68nf table 5. recommended values of r tune and c tune to obtain transient deviation of 2% of vout for a 1.5a step load with vin=3.3v. vo 2.5v 1.8v 1.2v 0.6v co 2 x 47 f2 x 47 f 4 x 47 f 4 x 47 f +330 f polymer r tune 33 33 33 33 c tune 22nf 27nf 47nf 150nf v 46mv 32mv 24mv 12mv
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 17 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. the test set-up is shown in figure 45. the preferred airflow direction for the module is shown in figure 46. a i r flow x power module w ind tunnel pwbs 12.7_ (0.50) 76.2_ (3.0) probe location for measuring airflow and ambient temperature 25.4_ (1.0) figure 45. thermal test setup. the thermal reference points, t ref used in the specifications are shown in figure 46. for reliable operation the temperatures at these points should not exceed 125 o c. 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. figure 46. preferred airflow direction and location of hot-spot of the module (tref).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 18 example application circuit requirements: vin: 3.3v vout: 1.8v iout: 2.25a max., worst case load transient is from 1.5a to 2.25a vout: 1.5% of vout (27mv) for worst case load transient vin, ripple 1.5% of vin (50mv, p-p) module vout sense gnd trim rtune ctune rtrim vin co1 + ci2 ci1 vin+ vout+ on/off q3 ci1 22 f/6.3v ceramic capacitor ci2 47 f/6.3v bulk electrolytic co1 2 x 47 f/6.3v ceramic capacitor (e.g. murata grm31cr60j476me19) ctune 27nf ceramic capacitor (can be 1206, 0805 or 0603 size) rtune 33 ohms smt resistor (can be 1206, 0805 or 0603 size) rtrim 1k smt resistor (can be 1206, 0805 or 0603 size, recommended tolerance of 0.1%)
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 19 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.) pin function 1 on/off 2 vin 3 gnd 4 vout 5 sense 6 trim 7 gnd 8 nc 9 seq 10 nc pin 7 pin 8 pin 10
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 20 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.) pin function 1 on/off 2 vin 3 gnd 4 vout 5 sense 6 trim 7 gnd 8 nc 9 seq 10 nc pin 8 pin 7 pin 10
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 21 packaging details the pico tlynx tm 3a modules are supplied in tape & reel as st andard. modules are shipped in quantities of 400 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: 24.00 mm (0.945?)
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 22 surface mount information pick and place the pico tlynx tm 3a 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. nozzle recommendations the module weight has been kept to a minimum by using open frame construction. variables such as nozzle size, tip style, vacuum pressure and placement speed should be considered to optimize this process. the minimum recommended inside nozzle diameter for reliable operation is 3mm. the maximum nozzle outer diameter, which will safely fit within the allowable component spacing, is 7 mm. lead free soldering the pico tlynx tm 3a modules are lead-free (pb-free) and rohs compliant and fully compatible in a pb-free 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. 47. soldering outside of the recommended profile requires testing to verify results and performance. msl rating the pico tlynx tm 3a modules have a msl rating of 2. 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. 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 47. recommended linear reflow profile using sn/ag/cu solder. 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).
data sheet september 9, 2009 pico tlynx tm 3a: non-isolated dc-dc power modules 2.4 ? 5.5vdc input; 0.6vdc to 3.63vdc output; 3a output current lineage power 23 document no: ds06-131 ver. 1.09 pdf name: apth003a0x_ds.pdf ordering information please contact your lineage power sales representativ e for pricing, availabili ty and optional features. table 6. device codes device code input voltage range output voltage output current on/off logic sequencing comcodes APXH003A0X-SRZ 2.4 ? 5.5vdc 0.6 ? 3.63vdc 3a negative no cc109113313 apxh003a0x4-srz 2.4 ? 5.5vdc 0.6 ? 3. 63vdc 3a positive no cc109113321 apth003a0x-srz 2.4 ? 5.5vdc 0.6 ? 3.63vdc 3a negative yes cc109113338 apth003a0x4-srz 2.4 ? 5.5vdc 0.6 ? 3.63vdc 3a positive yes cc109113346 apth003a0x-sr 2.4 ? 5.5vdc 0.6 ? 3.63vdc 3a negative yes cc109147484 table 7. coding scheme tlynx family sequencing feature. input voltage range output current output voltage on/off logic options rohs compliance ap t h 003a0 x 4 -sr z t = with seq. x = w/o seq. h = 2.4 ? 5.5v 3.0a x = programmable output 4 = positive no entry = negative s = surface mount r = tape&reel z = rohs6 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@li neagepower.com asia-pacific headquarters tel: +65 6416 4283 europe, middle-east and africa headquarters tel: +49 898 780 672 80 india headquarters tel: +91 80 28411633 lineage power reserves the right to m ake 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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