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cool-power ? rev 1.3 vicorpower.com page 1 of 37 0 2/2016 800 927.9474 36 vin to 60 vin cool-power zvs buck regulator & led driver cool-power ? pi354x-00 product description the pi354x-00 is a family of high input voltage, wide input range dc-dc zvs-buck regulators integrating controller, power switches, and support components all within a high density system-in-package (sip). the integration of a high- performance zero-voltage switching (zvs) topology, within the pi354x-00 series, increases point of load performance providing best in class power efficiency. the pi354x-00 requires only an external inductor, two voltage selection resistors and minimal capacitors to form a complete dc-dc switching mode buck regulator. pi354x-00 family can operate in constant voltage output for typical buck regulation applications in addition to constant current output for led lighting and battery charging applications. features ? high efficiency hv zvs-buck topology ? wide input voltage range of 36 v to 60 v ? very fast transient response ? constant voltage or constant current operation ? constant current error amplifier and reference ? power-up into pre-biased load ? parallel capable with single wire current sharing ? two phase interleaving ? input over/undervoltage lockout (ovlo/uvlo) ? output overvoltage protection (ovp) ? overtemperature protection (otp) ? fast and slow current limits ? differential amplifier for output remote sensing ? user adjustable soft-start & tracking ? -40c to 125c operating range (t j ) applications ? hv to pol buck regulator applications ? computing, communications, industrial, automotive equipment ? constant current output operation: ? led lighting ? battery charging package information ? 10 mm x 10 mm x 2.6 mm lga sip device output voltage i out max set range pi3542-00-lgiz 2.5 v 2.2 v to 3.0 v 10 a PI3543-00-LGIZ 3.3 v 2.6 v to 3.6 v 10 a pi3545-00-lgiz 5.0 v 4.0 v to 5.5 v 10 a pi3546-00-lgiz 12 v 6.5 v to 14 v 9 a
cool-power ? rev 1.3 vicorpower.com page 2 of 37 2/2016 800 927.9474 pi354x-00 contents contents page order information 3 thermal, storage, and handling information 3 absolute maximum ratings 4 functional block diagram 5 pin description 6 package pin-out 6 pi354x-00 common electrical characteristics 7 pi3542-00 (2.5 vout) electrical characteristics 8 pi3543-00 (3.3 vout) electrical characteristics 12 pi3545-00 (5.0 vout) electrical characteristics 16 pi3546-00 (12.0 vout) electrical characteristics 20 functional description 24 enable (en) 24 remote sensing 24 switching frequency synchronization 24 soft-start 24 output voltage selection 24 output current limit protection 24 input undervoltage lockout 24 input overvoltage lockout 24 output overvoltage protection 25 overtemperature protection 25 pulse skip mode (psm) 25 variable frequency operation 25 parallel operation 25 contents page application description 25 output voltage trim 25 soft-start adjust and tracking 26 inductor pairing 26 thermal de-rating 26 small signal model - constant voltage mode 26 lighting mode 28 lgh amplifier small signal model 29 filter considerations 31 vdr bias regulator 32 sytem design considerations 32 layout guidelines 33 recommended pcb footprint and stencil 34 package drawings 35 revision history 36 warranty 37
cool-power ? rev 1.3 vicorpower.com page 3 of 37 0 2/2016 800 927.9474 pi354x-00 order information thermal, storage, and handling information cool-power output range i out max package transport media set range pi3542-00-lgiz 2.5 v 2.2 v to 3.0 v 10 a 10 mm x 10 mm lga tray PI3543-00-LGIZ 3.3 v 2.6 v to 3.6 v 10 a 10 mm x 10 mm lga tray pi3545-00-lgiz 5.0 v 4.0 v to 5.5 v 10 a 10 mm x 10 mm lga tray pi3546-00-lgiz 12 v 6.5 v to 14 v 9 a 10 mm x 10 mm lga tray name rating storage temperature -65c to 150c operating junction temperature -40c to 125c soldering temperature for 20 seconds 245c msl rating 3
cool-power ? rev 1.3 vicorpower.com page 4 of 37 2/2016 800 927.9474 pi354x-00 absolute maximum ratings notes: at 25c ambient temperature. stresses beyond these limits may cause permanent damage to the device. operation at these conditio ns or conditions beyond those listed in the electrical specifications table is not guaranteed. all voltage nodes are referenced to pgnd unless otherwise noted. name rating v in -0.7 v to 75 v vs1 -0.7 to 75 v, -4 v for 5 ns v out -0.5 v to 25 v sgnd 100 ma trk -0.3 v to 5.5 v / 30 ma vdr, synci, synco, pwrgd, en, lgh, comp, eao, eain, vdiff, vsn, vsp, testx -0.3 v to 5.5 v / 5 ma
cool-power ? rev 1.3 vicorpower.com page 5 of 37 0 2/2016 800 927.9474 pi354x-00 functional block diagram vin pgnd s gnd synco pwrgd q1 q2 vcc en synci trk eao eain power control + - 2f vdr 0 zvs control digital parametric trim 1v comp + - 100mv vsp + - vsn lgh vdiff vs1 vout testx simplified block diagram
cool-power ? rev 1.3 vicorpower.com page 6 of 37 2/2016 800 927.9474 pi354x-00 package pin-out pin description block 1: v in ; k9-10, j9-10, h9-10, g9-10 block 2: vs1; k1-7 block 3: pgnd; h1-7, g1-7,f1-7, e2-8, d2-8, c2-5 block 4: sgnd; d9, c6-9, b4-9, a7 85 pad lga sip (10 mm x 10mm) (top through view) name location i/o description vs1 block 2 (see pkg pin-out dwg) i/o switching node: and zvs sense for power switches. vin block 1 i input voltage: and sense for uvlo, ovlo and feed forward ramp. vdr 1e i/o gate driver v cc : internally generated 5.1 v. may be used as reference or low power bias supply for up to 2 ma. must be impedance limited by the user. synci 1d i synchronization input: synchronize to the falling edge of external clock frequency. synci is a high impedance digital input node and should always be connected to sgnd when not in use. synco 1c o synchronization output: outputs a high signal for ? of the minimum period for synchronization of other regulators. testx 1b, 1a, 2b, 2a i/o test connections: use only with factory guidance. connect to sgnd for proper operation. pwrgd 3a o power good: high impedance when regulator is operating and v out is in regulation. may also be used as ?parallel good? ? see applications section. en 4a i enable input: regulator enable control. asserted high or left floating ? regulator enabled; asserted low, regulator output disabled. trk 5a i soft-start and track input: an external capacitor may be connected between trk pin and sgnd to decrease the rate of rise during soft-start. lgh 6a i lighting (lgh)/constant current (cc) sense input: input with a 100 mv threshold. used for lighting and constant current type applications.when not using the constant current mode (cc mode), the lgh pin should be connected to sgnd. comp 8a o compensation capacitor: connect capacitor for control loop dominant pole. eao 9a o error amp output : external connection for additional compensation and current sharing. eain 10a i error amp inverting input: connection for the feedback divider tap. vdiff 10b o independent amplifier output: if unused connect in unity gain with vsp connected to sgnd. vsn 10c i independent amplifier inverting input vsp 10d i independent amplifier non-inverting input vout 9e, 10e i/o output voltage: and sense for power switches and feed-forward ramp. sgnd block 4 - signal ground: internal logic ground for ea, trk, synci, synco communication returns. sgnd and pgnd are star connected within the regulator package. pgnd block 3 - power ground: v in and v out power returns.
cool-power ? rev 1.3 vicorpower.com page 7 of 37 0 2/2016 800 927.9474 pi354x-00 pi354x-00 common electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 8 of 37 2/2016 800 927.9474 pi354x-00 pi3542-00 (2.5 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 9 of 37 0 2/2016 800 927.9474 pi354x-00 pi3542-00 (2.5 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 10 of 37 2/2016 800 927.9474 pi354x-00 efficiency at 25? i out (a) efficiency (%) 36 vin 48 vin 60 vin 60 65 70 75 80 85 90 012345678910 figure 1 ? regulator efficiency figure 2 ? transient response: 5 a to 10 a, at 1 a/s. 48 v in to 2.5 v out , c out = 6 x 100 f ceramic figure 4 ? output ripple: 48 v in , 2.5 v out at 10 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 100 f ceramic figure 3 ? output short circuit @ v in = 48 v pi3542-00 (2.5 v out ) electrical characteristics figure 6 ? output ripple: 48 v in , 2.5 v out at 5 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 100 f ceramic switching frequency vs. load current i out (a) frequency (khz) 36 vin 48 vin 60 vin 250 275 300 325 350 375 400 425 450 012345678910 figure 5 ? switching frequency vs. load current
cool-power ? rev 1.3 vicorpower.com page 11 of 37 0 2/2016 800 927.9474 pi354x-00 load current vs. ambient temperature, 0 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 7 ? load current vs. ambient temperature, 0 lfm load current vs. ambient temperature, 200 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 8 ? load current vs. ambient temperature, 200 lfm load current vs. ambient temperature, 400 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 9 ? load current vs. ambient temperature, 400 lfm pi3542-00 (2.5 v out ) electrical characteristics v(eao) volts output current dc amps i out @ v in = 36 v i out @ v in = 48 v i out @ v in = 60 v output current vs. error voltage v(eao) 0 2 4 6 8 10 12 0 0.5 1 1.5 2 2.5 3 figure 10 ? output current vs. error voltage v(eao) v(eao) volts dc output resistance ohms - dcm req_out_dcm @ v in = 36 v req_out_dcm @ v in = 48 v req_out_dcm @ v in = 60 v req_out_crcm @ v in = 60 v req_out_crcm @ v in = 36 v req_out_crcm @ v in = 48 v 0 5 10 15 20 25 30 35 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 0123 output equivalent resistance vs. error voltage v(eao) figure 12 ? output equivalent resistance vs.error voltage v(eao) v(eao) volts modulator gain siemens g mod @ v in = 36 v g modt @ v in = 48 v g mod @ v in = 60 v modulator gain vs. error voltage (veao) 0 1 2 3 4 5 6 7 8 0123 figure 11 ? modulator gain vs. error voltage (veao)
cool-power ? rev 1.3 vicorpower.com page 12 of 37 2/2016 800 927.9474 pi354x-00 pi3543-00 (3.3 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 13 of 37 0 2/2016 800 927.9474 pi354x-00 pi3543-00 (3.3 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 14 of 37 2/2016 800 927.9474 pi354x-00 efficiency at 25? i out (a) efficiency (%) 36 vin 48 vin 60 vin 012345678910 70 75 80 85 90 95 figure 13 ? regulator efficiency figure 14 ? transient response: 5 a to 10 a, at 1 a/s. 48 v in to 3.3 v out , figure 16 ? output ripple: 48 v in , 3.3 v out at 10 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 100 f ceramic figure 15 ? output short circuit @ v in = 48 v pi3543-00 (3.3 v out ) electrical characteristics figure 18 ? output ripple: 48 v in , 3.3 v out at 5 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 100 f ceramic switching frequency vs. load current i out (a) frequency (khz) 36 vin 48 vin 60 vin 012345678910 250 300 350 400 figure 17 ? switching frequency vs. load current
cool-power ? rev 1.3 vicorpower.com page 15 of 37 0 2/2016 800 927.9474 pi354x-00 load current vs. ambient temperature, 0 lfm ambient temperature (?c) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 19 ? load current vs. ambient temperature, 0 lfm load current vs. ambient temperature, 200 lfm ambient temperature (?c) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 20 ? load current vs. ambient temperature, 200 lfm load current vs. ambient temperature, 400 lfm ambient temperature (?c) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 21 ? load current vs. ambient temperature, 400 lfm pi3543-00 (3.3 v out ) electrical characteristics v(eao) volts output current dc amps i out @ v in = 36 v i out @ v in = 48 v i out @ v in = 60 v output current vs. error voltage v(eao) 0 2 4 6 8 10 12 01234 figure 22 ? output current vs. error voltage v(eao) v(eao) volts dc output resistance ohms - dcm req_out_dcm @ v in = 36 v req_out_dcm @ v in = 48 v req_out_dcm @ v in = 60 v req_out_crcm @ v in = 60 v req_out_crcm @ v in = 36 v req_out_crcm @ v in = 48 v output equivalent resistance vs. error voltage v(eao) 0 20 40 60 80 100 120 0 0.5 1 1.5 2 2.5 3 3.5 01234 figure 24 ? output equivalent resistance vs. error voltage v(eao) v(eao) volts modulator gain siemens g mod @ v in = 36 v g modt @ v in = 48 v g mod @ v in = 60 v modulator gain vs. error voltage (veao) 0 1 2 3 4 5 6 7 8 01234 figure 23 ? modulator gain vs. error voltage (veao)
cool-power ? rev 1.3 vicorpower.com page 16 of 37 2/2016 800 927.9474 pi354x-00 pi3545-00 (5.0 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 17 of 37 0 2/2016 800 927.9474 pi354x-00 pi3545-00 (5.0 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 18 of 37 2/2016 800 927.9474 pi354x-00 efficiency at 25? i out (a) efficiency (%) 36 vin 48 vin 60 vin 012345678910 70 75 80 85 90 95 figure 25 ? regulator efficiency figure 26 ? transient response: 5 a to 10 a, at 1 a/s. 48 v in to 5.0 v out c out = 6 x 47 f ceramic figure 28 ? output ripple: 48 v in , 5.0 v out at 10 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 47 f ceramic figure 27 ? output short circuit @ v in = 48 v pi3545-00 (5.0 v out ) electrical characteristics figure 30 ? output ripple: 48 v in , 5.0 v out at 5 a. v out = 20 mv/div, 2.0 s/div; c out = 6 x 47 f ceramic switching frequency vs. load current i out (a) frequency (khz) 36 vin 48 vin 60 vin 012345678910 400 450 500 550 600 figure 29 ? switching frequency vs. load current
cool-power ? rev 1.3 vicorpower.com page 19 of 37 0 2/2016 800 927.9474 pi354x-00 load current vs. ambient temperature, 0 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 31 ? load current vs. ambient temperature, 0 lfm load current vs. ambient temperature, 200 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 32 ? load current vs. ambient temperature, 200 lfm load current vs. ambient temperature, 400 lfm ambient temperature (?) output load current (a) 36 vin 48 vin 60 vin 0 2 4 6 8 10 12 50 75 100 125 figure 33 ? load current vs. ambient temperature, 400 lfm pi3545-00 (5.0 v out ) electrical characteristics v(eao) volts output current dc amps i out @ v in = 36 v i out @ v in = 48 v i out @ v in = 60 v output current vs. error voltage v(eao) 0 2 4 6 8 10 12 0 0.5 1 1.5 2 2.5 3 figure 34 ? output current vs. error voltage v(eao) v(eao) volts dc output resistance ohms - dcm req_out_dcm @ v in = 36 v req_out_dcm @ v in = 48 v req_out_dcm @ v in = 60 v req_out_crcm @ v in = 60 v req_out_crcm @ v in = 36 v req_out_crcm @ v in = 48 v output equivalent resistance vs. error voltage v(eao) 0 5 10 15 20 25 30 35 40 45 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 0123 figure 36 ? output equivalent resistance vs. error voltage v(eao) v(eao) volts modulator gain siemens g mod @ v in = 36 v g modt @ v in = 48 v g mod @ v in = 60 v modulator gain vs. error voltage (veao) 0 1 2 3 4 5 6 7 8 0123 figure 35 ? modulator gain vs. error voltage (veao)
cool-power ? rev 1.3 vicorpower.com page 20 of 37 2/2016 800 927.9474 pi354x-00 pi3546-00 (12.0 v out ) electrical characteristics specifications apply for -40c cool-power ? rev 1.3 vicorpower.com page 31 of 37 0 2/2016 800 927.9474 pi354x-00 filter considerations the pi354x-00 requires low impedance ceramic input capacitors (x7r/x5r or equivalent) to ensure proper start up and high frequency decoupling for the power stage. the pi354x-00 will draw nearly all of the high frequency current from the low impedance ceramic capacitors when the main high side mosfet(s) are conducting. during the time the mosfet(s) are off, the input capacitors are replenished from the source. table 4 shows the recommended input and output capacitors to be used for the pi354x-00 as well as per capacitor rms ripple current and the input and output ripple voltages. table 5 includes the recommended input and output ceramic capacitors. it is very important to verify that the voltage supply source as well as the interconnecting lines are stable and do not oscillate. input filter case 1; inductive source and local, external, input decoupling capacitance with negligible esr (i.e.: ceramic type): the voltage source impedance can be modeled as a series r(line) l(line) circuit. the high performance ceramic decoupling capacitors will not significantly damp the network because of their low esr; therefore in order to guarantee stability the following conditions must be verified: where r_eqin can be calculated by dividing the lowest line voltage by the full load input current. it is critical that the line source impedance be at least an octave lower than the converters dynamic input resistance, equation (17). however, r_line cannot be made arbitrarily low otherwise equation (16) is violated and the system will show instability, due to an under-damped rlc input network. input filter case 2; inductive source and local, external input decoupling capacitance with significant rcin_ext esr (i.e.: electrolytic type): in order to simplify the analysis in this case, the voltage source impedance can be modeled as a simple inductor lline. notice that, the high performance ceramic capacitors cin_int within the pi354x-00 should be included in the external electrolytic capacitance value for this purpose. the stability criteria will be: equation (19) shows that if the aggregate esr is too small C for example by using very high quality input capacitors (c in_ext ) C the system will be under-damped and may even become destabilized. as noted, an octave of design margin in satisfying equation (18) should be considered the minimum. when applying an electrolytic capacitor for input filter damping the esr value must be chosen to avoid loss of converter efficiency and excessive power dissipation in the electrolytic capacitor. figure 66 ? gmlgh(s) gain/phase plot compensated 1 10 100 1000 10000 100000 1000000 0 50 100 150 150 100 50 0 gain - dbv phase-degrees frequency- hz gain-dbv phase-degrees figure 67 ? lighting application loop gain/phase plot 1 10 100 1000 10000 100000 1000000 50 0 50 100 150 0 50 100 150 gain - dbv phase-degrees frequency- hz gain-dbv phase-degrees r line > (16) l line (cin int + cin ext ) ? |r_eqin| r line << |r_eqin| (17) |r_eqin| > r cin ext (18) l line (cin int ? r cin ext ) > |r_eqin| (19)
cool-power ? rev 1.3 vicorpower.com page 32 of 37 2/2016 800 927.9474 pi354x-00 vdr bias regulator the vdr internal bias regulator is a zvs switching regulator that resides internal to the pi354x-00 product family. it is intended strictly for use to power the internal controller and driver circuitry. the power capability of this regulator is sized only for the pi354x-00, with adequate reserve for the application it was intended for. it may be used for as a pull- up source for open collector applications and for other very low power use with the following restrictions: 1. no direct connection is allowed. any noise source that can disturb the vdr voltage can also affect the internal controller operation. 2. all loads must be locally de-coupled using a 0.1 f ceramic capacitor. this capacitor must be connected to the vdr output through a series resistor no smaller than 1 k. which forms a loss pass filter and limits the total current to 5 ma. system design considerations 1. inductive loads- as with all power electronic applications, consideration must be given to driving inductive loads that may be exposed to a fault in the system which could result in consequences beyond the scope of the power supply primary protection mechanisms. an inductive load could be a filter, fan motor or even excessively long cables. consider an instantaneous short circuit through an un-damped inductance that occurs when the output capacitors are already at an initial condition of fully charged. the only thing that limits the current is the inductance of the short circuit and any series resistance. even if the power supply is off at the time of the short circuit, the current could ramp up in the external inductor and store considerable energy. the release of this energy will result in considerable ringing, with the possibility of ringing nodes connected to the output voltage below ground. the system designer should plan for this by considering the use of other external circuit protection such as load switches, fuses, and transient voltage protectors. the inductive filters should be critically damped to avoid excessive ringing or damaging voltages. adding a high current schottky diode from the output voltage to pgnd close to the pi354x-00 is recommended for these applications. 2. low voltage operation C there is no isolation from an selv (safety-extra-low-voltage) power system. powering low voltage loads from input voltages as high as 60 v may require additional consideration to protect low voltage circuits from excessive voltage in the event of a short circuit from input to output. a fast tvs (transient voltage suppressor) gating an external load switch is an example of such protection. 3. use of lighting mode (lgh) as a battery charger is certainly very feasible. it is fashionable to design these chargers such that the battery is always connected to it. since the buck topology is not isolated, shorting the input terminals or capacitors of an unpowered regulator/charger could allow damaging current flow through the body diode of the high side mosfet that would be unprotected by a conventional input fuse. it is recommended to connect the pi354x-00 family to the battery using an active oring device if lgh mode is used as a constant current battery charger. the same should be considered for super-capacitor applications as well.
cool-power ? rev 1.3 vicorpower.com page 33 of 37 0 2/2016 800 927.9474 pi354x-00 device v in (v) i load (a) c input ceramic x5r c output ceramic x5r c input ripple current ( irms ) c output ripple current (i rms ) input ripple (mvpp) output ripple (mvpp) transient deviation (mvpk) recovery time (s) load step (a) (slew/s) pi3542 48 10 5 x 2.2 f 100 v 6 x 100 f 0.7 1.32 416 47 -/+80 40 5 (1 a/s) 5 220 22 pi3543 48 10 5 x 2.2 f 100 v 6 x 100 f 0.8 1.3 464 61.6 -/+90 40 5 (1 a/s) 5 230 31 pi3545 48 10 5 x 2.2 f 100 v 6 x 47 f .88 1.37 485 62 -/+150 40 5 (1 a/s) 5 245 32 pi3546 48 9 5 x 2.2 f 100 v 6 x 10 f 1.12 1.26 880 114 -/+300 20 5 (1 a/s) 4.5 125 33 table 3 ? recommended input and output capacitance table 4 ? capacitor manufacturer part numbers murata part number description c3225x7s1h1106m250ab 2.2 f 100 v 1210 x7r c3225x7s1h106m250ab 10 f 50 v 1210 x7r grm31cr60j107me39l 100 f 6.3 v 1206 x7r grm31cr61a476me15l 47 f 10 v 1206 x5r grm32er61h106ma12 10 f 50 v 1210 x7r layout guidelines to optimize maximum efficiency and low noise performance from a pi354x-00 design, layout considerations are necessary. reducing trace resistance and minimizing high current loop returns along with proper component placement will contribute to optimized performance. a typical buck converter circuit is shown in figure 68. the potential areas of high parasitic inductance and resistance are the circuit return paths, shown as lr below. the path between the cout and cin capacitors is of particular importance since the ac currents are ?owing through both of them when q1 is turned on. figure 69, schematically, shows the reduced trace length between input and output capacitors. the shorter path lessens the effects that copper trace parasitics can have on the pi354x-00 performance. when q1 is on and q2 is off, the majority of c in s current is used to satisfy the output load and to recharge the c out capacitors. when q1 is off and q2 is on, the load current is supplied by the inductor and the c out capacitor as shown in figure 70. during this period c in is also being recharged by the v in . minimizing c in loop inductance is important to reduce peak voltage excursions when q1 turns off. also, the difference in area between the c in loop and c out loop is vital to minimize switching and gnd noise. in c in v in v out c figure 68 ? typical buck regulator out c n v out c n v i n v c figure 69 ? current flow: q1 closed out c n v c out c n v i n v c figure 70 ? current flow: q2 closed
the recommended component placement, shown in figure 71, illustrates the tight path between c in and c out (and v in and v out ) for the high ac return current. this optimized layout is used on the pi354x-00 evaluation board. figure 72 details the recommended receiving footprint for pi354x-00 10 mm x 10 mm package. all pads should have a ?nal copper size of 0.55 mm x 0.55 mm, whether they are solder-mask de?ned or copper de?ned, on a 1 mm x 1 mm grid. all stencil openings are 0.45 mm when using either a 5 mil or 6 mil stencil. cool-power ? rev 1.3 vicorpower.com page 34 of 37 2/2016 800 927.9474 pi354x-00 detail a - recommended soldermask openings. cdp = copper de?ed pads. a 0.50mm 1.00mm 0.50mm pin a1 outline of 10mm x 10 mm sip package. all pads are on 1mm square grid. 0.55mm 0.55mm (cdp) 0.65mm 0.55mm 0.65mm 0.55mm (cdp) 1.00mm figure 72 ? recommended receiving pcb footprint in c out c out in v v gnd vsw gnd figure 71 ? recommended component placement and metal routing recommended pcb footprint and stencil
cool-power ? rev 1.3 vicorpower.com page 35 of 37 0 2/2016 800 927.9474 pi354x-00 package drawings package bottom view package top view package side view detail a detail b notes e represents the basic terminal pitch. specifies the true ge ome tri c pos ition of the termi na l a xis. dimension b applies to metallized pad opening. d im en sio n ? ? in cl u de s p ac kag e w ar pa ge. ex pos ed metal lized p ads a re cu pa ds wi th surfa ce finish prote ctio n. all dimensions in millimeters. d e pin 1 index pad o pening b l l1 pin 1 index d1 e1 1 e se e notes see notes detail a mold cap subs tra te a seating plane pad o pening solder mask a2 a1 3 1 2 3 4 b a aaa c c aaa c 5 bbb c / / ddd c m b a c eee m 2 ddd c m b a c eee m b l e se e notes 1 4x dimensions 10.00 bsc 10.00 bsc 9.00 bsc 9.00 bsc 1.00 bsc max 2.63 0.04 2.59 0.60 0.60 0.275 0.10 0.10 0.08 0.10 0.08 symbol a a1 a2 b l d e d1 e1 e l1 aaa bbb ccc ddd eee nom 2.56 0.55 0.55 0.225 min 2.49 0.50 0.50 0.175 datum a datum b detail b
cool-power ? rev 1.3 vicorpower.com page 36 of 37 2/2016 800 927.9474 pi354x-00 revision history revision date description page number(s) 1.0 - 1.1 05/2015 released engineering format/style n/a 1.2 10/12/15 reformatted in new template n/a 1.3 02/19
cool-power ? rev 1.3 vicorpower.com page 37 of 37 0 2/2016 800 927.9474 pi354x-00 vicor?s comprehensive line of power solutions includes high density ac-dc and dc-dc modules and accessory components, fully configurable ac-dc and dc-dc power supplies, and complete custom power systems. information furnished by vicor is believed to be accurate and reliable. however, no responsibility is assumed by vicor for its use. vicor makes no representations or warranties with respect to the accuracy or completeness of the contents of this publication. vicor reserves the right to make changes to any products, specifications, and product descriptions at any time without notice. information published by vicor h as been checked and is believed to be accurate at the time it was printed; however, vicor assumes no responsibility for inaccuracies. testing and other quality controls are used to the extent vicor deems necessary to support vicor?s product warranty. except where mandated by government requirements , testing of all parameters of each product is not necessarily performed. specifications are subject to change without notice. vicor?s standard terms and conditions all sales are subject to vicor?s standard terms and conditions of sale, which are available on vicor?s webpage or upon request. product warranty in vicor?s standard terms and conditions of sale, vicor warrants that its products are free from non-conformity to its standard specifications (the ?express limited warranty?). this warranty is extended only to the original buyer for the period expiring two (2) years after t he date of shipment and is not transferable. unless otherwise expressly stated in a written sales agreement signed by a duly authorized vicor signatory, vicor disclaims all representations, liabilities, and warranties of any kind (whether arising by implication or by operation of law) with respect to the products, including, without limitation, any warranties or representations as to merchantability, fitness for particular purpose, infringement of any patent, copyright, or other intellectual property right, or any other matter. this warranty does not extend to products subjected to misuse, accident, or improper application, maintenance, or storage. vico r shall not be liable for collateral or consequential damage. vicor disclaims any and all liability arising out of the application or use of any pro duct or circuit and assumes no liability for applications assistance or buyer product design. buyers are responsible for their products and applications us ing vicor products and components. prior to using or distributing any products that include vicor components, buyers should provide adequate design, testing and operating safeguards. vicor will repair or replace defective products in accordance with its own best judgment. for service under this warranty, the buyer must contact vicor to obtain a return material authorization (rma) number and shipping instructions. products returned without prior author ization will be returned to the buyer. the buyer will pay all charges incurred in returning the product to the factory. vicor will pay all re shipment charges if the product was defective within the terms of this warranty. life support policy vicor?s products are not authorized for use as critical components in life support devices or systems without the express prior written approval of the chief executive officer and general counsel of vicor corporation. as used herein, life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) support or sustain life and wh ose failure to perform when properly used in accordance with instructions for use provided in the labeling can be reasonably expected to result in a s ignificant injury to the user. a critical component is any component in a life support device or system whose failure to perform can be reasonably expec ted to cause the failure of the life support device or system or to affect its safety or effectiveness. per vicor terms and conditions of sale, the user of vicor products and components in life support applications assumes all risks of such use and indemnifies vicor against all liability and damag es. intellectual property notice vicor and its subsidiaries own intellectual property (including issued u.s. and foreign patents and pending patent applications ) relating to the products described in this data sheet. no license, whether express, implied, or arising by estoppel or otherwise, to any intel lectual property rights is granted by this document. interested parties should contact vicor's intellectual property department. the products described on this data sheet are protected by the following u.s. patents numbers: 6,788,033; 7,154,250; 7,561,446; 7,361,844; d496,906; d506,438; 6,940,013; 7,038,917; 6,969,909; 7,166,898; 6,421,262; 7,368,95 7; re 40,072 vicor corporation 25 frontage road andover, ma 01810 usa picor corporation 51 industrial drive north smithfield, ri 02896 usa email customer service: custserv@vicorpower.com technical support: apps@vicorpower.com

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