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www.irf.com 1 high reliability class k hybrid,radiation hardened, non-isolated point of load (pol) voltage regulator sbb series descriptionthe sbb series point of load (pol) dc to dc voltage regulators are high reliability hermetically sealed thick film hybrids designed to provide a single regulated dc output from a dc voltage source. the output power rating is 14w to 30w depending on output voltage, with maximum current rating of 14a. the pols are class k qualified per mil-prf-38534. these products are designed to operate continuously on board a space craft up to the rated power output without power derating for case temperature of 85c. the pols are suitable for harsh radiation environments normally encountered in the geo-synchronous orbit (geo), medium earth orbit (meo), low earth orbit (leo), deep space, and for other challenging radiation design applications. the sbb pol is a non isolated synchronous buck regulator. it incorporates irs heritage- rich components and circuit design library for long term reliability expected of system designs with a mission life of up to 18 years or more. the sbb series of pols operate from a dc input power source with the voltage range of 4.5v to 5.5v. it converts dc input voltage down to a fixed and highly stable dc output. the standard voltage outputs are 1.0v, 1.2v, 1.5v, 1.8v, 2.5v, and 3.3v. the output is adjustable with the addition of an external resistor. the output adjustment range is approximately 10% of a nominal output voltage. also included is remote sensing capability to compensate for voltage drops in the output lines. this feature, in combination with the output adjustment capability, enables an output voltage of a pol to be accurately set as needed. single output with its excellent efficiency performance, sbb polsare ideal as the point of load regulators for the distributed power architecture (dpa) design systems. other key benefits include excellent dynamic load response, precise voltage setting, remote output voltage sensing and synchronization. features total dose >100k rads (si) see hardness rated with let > 82 mev-cm 2 /mg operates from 4.5v to 5.5v dc supply fixed output voltage: 1v, 1.2v, 1.5v, 1.8v, 2.5v and 3.3v are standards output power up to 30w or 14a maximum without de-rating high efficiency to 89% remote sense compensation fixed 400 khz operating frequency output adjustable to 10% of nominal output with an external resistor enable function pin for remote on/off control input undervoltage and output under voltage protection overload and short circuit protection low noise with integrated input and output filters no external filter capacitors required soft start under voltage lockout (uvlo) synchronization output status telemetry(pok) -55 to +85c operating case temperature without output power derating mil-prf-38534 element evaluated components custom versions available derating per mil-std-1547 for space flight mtbf > 2.8 million hours for space flight environments standard microcircuit drawings (smds) available pd-97563b downloaded from: http:///
2 www.irf.com sbb seriessingle output circuit descriptionthe sbb series pols utilize a non-isolated buck circuit design topology with synchronous output rectification to maximize efficiency. the nominal switching frequency is 400 khz. an internal emi filter minimizes the reflected switching ripple current to meet most space applications at the system level. a two-stage output filter reduces the output ripple and noise to a very low level required by todays digital loads. no external filter capacitors are required for typical design applications. output current is limited under any load fault condition. it is designed to behave similar to a constant current source with the output voltage dropping below nominal. the sbb pol will resume normal operation when the load current is reduced below the current limit point. this protects the pol from both overload and short circuit conditions. the current limit threshold exhibits a negativetemperature coefficient to reduce the possibility of thermal runaway. undervoltage lockout (uvlo) : an uvlo circuit prohibits the pol from operating when the linevoltage is too low to maintain the output voltage. the pol will not start until the line input voltage rises to approximately 4.3 volts and will shut down when the input voltage drops below 3.9 volts. the products package footprint is less than three square inches. the package and lid materials arecold rolled steel. the low profile package measures 1.9"l x 1.5"w x 0.335"h, excluding mounting tabs and input/output (i/o) pins. the ceramic sealed i/o pins protrude the packages side walls with the mounting tabs on the corners of the side walls. the i/o pins are copper alloy 52. the pins are gold plated for long term storage. gold is to be removed prior to assembly. a complete pol weighs less than 60 grams. cooling of this device can be accomplished by bonding the base of the package to a metal plateor heat sink with a thermally conductive material. the packages mechanical outline and i/o pins functional assignment are included in this data sheet. the sbb pols are designed, manufactured, tested, and qualified at irs facility in san jose, california which is qualified to iso9001 and mil-prf-38534 by dscc. flight hardware is 100% screened and fully compliant to class k per mil-prf-38534. abbreviated screening version or engineering model (em) of the sbb is available for engineering evaluation. please refer to the device screening table for details. output voltage adjustment: the output voltage (vout) of an sbb can be adjusted to 10% of anominal output voltage. one external resistor with a power rating of > 0.125 watt is required for this function. following is the formula to determine an approximate value of the resistor and how it needs to beconnected to the functional pins for a higher and a lower output voltage with respect to the nominal output voltage. to reduce vout, connect an adjust resistor to vadjust pin and output pin ? ?? ? ?? ? ? ?? ? ?? ? ? ? = vnom vout vnom vout radj 2 2 10280 11280 to increase vout, connect an adjust resistor tovadjust pin and output return pin ? ?? ? ?? ? ? ?? ? ?? ? ? ? = vnom vout vnom vout radj 2 2 10280 9280 where:radjust is the value of the adjust resistor in ohms( ? ) vnom is the nominal output voltage of the sbb downloaded from: http:///
www.irf.com 3 sbb seriessingle output enable : an enable pin is provided to remotely turn the pol on or off. it can also be used for outputsequenceing for multiple sbb pol regulators. the nominal threshold relative to the input return (pin 2) is 2.5v. if 3.9 volts or greater are applied to the inhibit pin (pin 3) then the pol will operate normally. the pin may be left open for normal operation. a voltage of 0.4v or less will cause the sbb pol to shut down. synchronization : an external synchronization port is provided to allow the multiple sbb pols to besynchronized to an external frequency source to minimize the noise interference coming from the switching operation of the pols. the synchronization frequency ranges from 360 khz to 440 khz and thesynchronization signal port can be driven from 5v logic. the sbb series pols use a proven conservative design methodology with careful incorporation of known radiation performance devices and established reliability components. all components are fullyderated to mil-std-1547. standard design analyses include stress, thermal, failure modes and effects (fmea), reliability & worst case and are available upon request. pok :the sbb pol also provides a power ok (pok) output status signal at pin 11. a logic high signal ispresent when the pols output voltage is greater than 95% of the nominal output voltage. a logic low signal at pin 11 indicates the pols output voltage drops below the output voltage threshold of 95% remote sense : output pins 4 and 5 must be connected to +sense pin 6 for proper operation. the +sense pinmay be connected remotely to the output line at the load to compensate for a voltage drop in the output line for precise optimum output regulation. the maximum voltage compensation in combination with the output voltage adjustment (if required) is limited to 10% of the nominal output voltage.to enhance the load regulation performance input return (pin 2) may be connected externally to output return (pin 3). downloaded from: http:///
4 www.irf.com sbb seriessingle output electrical performance characteristics for notes to electrical performance characteristics table, refer to page 6 1 meets derating per mil-std-1547 input voltage range -0.5vdc to +7.0vdc input voltage range 4.5vdc to 5.5vdc output power internally limited output power 0 to max. rated lead temperature 300c for 10 seconds operating case temperature -55c to +125c operating case temperature 1 -55c to +85c storage temperature -55c to +125c storage temperature -55c to +125c recommended operating conditions absolute maximum ratings limits parameter group a subgroup conditions -55 c t c +85 c v in = 5.0v dc 5%, c l = 0 unless otherwise specified min nom max unit input voltage 4.5 5.0 5.5 v output voltage (v out ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1 1 1 1 1 1 2,3 2,3 2,3 2,3 2,3 2,3 i out = 100% rated load i out = 100% rated load 0.985 1.182 1.478 1.773 2.463 3.251 0.970 1.164 1.462 1.755 2.450 3.234 1.000 1.200 1.500 1.800 2.500 3.300 1.015 1.218 1.523 1.827 2.538 3.350 1.030 1.236 1.537 1.855 2.550 3.366 v output power (p out ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 v in = 4.5, 5.0 and 5.5v, note 2 14 16.8 21 25.2 30 30 w output current (i out ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 v in = 4.5, 5.0 and 5.5v, note 2 0 0 0 0 0 0 14 14 14 14 12 9.1 a line regulation (vr line ) 1,2,3 v in = 4.5, 5.0, 5.5 volts i out = 0, 50%, 100% rated -0.25 0.25 % load regulation (vr load ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 v in = 4.5, 5.0, 5.5 volts i out = 0, 50%, 100% rated -15 -15 -15 -15 -13 -17 15 15 15 15 17 17 mv switching frequency (f s ) 1,2,3 sync input (pin 9) open 360 400 440 khz downloaded from: http:///
www.irf.com 5 sbb seriessingle output for notes to electrical performance characteristics table, refer to page 6 electrical performance characteristics ( continued ) limits parameter group a subgroup conditions -55 c t c +85 c v in = 5.0v dc 5%, c l = 0 unless otherwise specified min nom max unit i out = 0, pin 10 open 130 200 input current (i in ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s pin 10 shorted to pin 2 40 50 ma output ripple (v ri p ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 v in = 4.5, 5.0, 5.5 volts i out = 100% rated load, note 3 30 30 30 30 25 20 mv p-p efficiency (e ff ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 i out = 100% rated load 67 70 73 76 82 86 % enable input (inhibit function) open circuit voltage drive current (sink) voltage range 1,2,3 note 1 v in - 0.8 -0.5 v in 500 50 v a v synchronization input frequency range pulse high level pulse low level pulse transition time pulse duty cycle 1,2,3 external clock for s y nc input (pin 9) note 1 360 vin -0.5 -0.5 20 440 vin +0.5 +0.5 50 80 khz v v ns % current limit point sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 v out = 90% of nominal 14.5 14.5 14.5 14.5 12.5 9.5 21.5 21.5 21.5 21.5 17.9 13.7 a power dissipation, load fault (p d ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 1,2,3 short circuit, overload, note 5 11 11 11 11 9.5 8.0 w output response to step load changes (v tld ) sbb501s sbb501r2s sbb501r5s sbb501r8s sbb502r5s sbb503r3s 4,5,6 half load to/from full load, note 6 -150 -150 -150 -150 -200 -200 150 150 150 150 200 200 mv downloaded from: http:///
6 www.irf.com sbb seriessingle output electrical performance characteristics ( continued ) electrical performance characteristics - notes 1. parameter is tested as part of design characterization or after design changes. thereafter, parameter shall be guaranteed to the limits specified. 2. parameter verified during line and load regulation tests. 3. guaranteed for a d.c. to 20mhz bandwidth. tested using a 20khz to 10mhz bandwidth. 4. capacitive load may be any value from 0 to the maximum limit without compromising dc performance. a capacitive load in excess of the maximum limit may cause erratic behavior during turn-on. 5. overload power dissipation is defined as the device power dissipation with the load set such that v out = 90% of nominal. 6. load step transition time 1.0 s/a for 3.3v & 2.5v models and 0.1 s/a for 1.0v, 1.2v, 1.5v & 1.8v models. 7. recovery time is measured from the initiation of the transient to where v out has returned to within 1% of its steady state value. 8. line step transition time 10 s. 9. turn-on delay time from either a step application of input power or a logic low to a logic high transition on the enable pin (pin 10) to the point where v out = 90% of nominal. notes: international rectifier currently does not have a dla land and maritime (formerly dscc) certifiedradiation hardness assurance program. limits parameter group a subgroup conditions -55 c t c +85 c v in = 5.0v dc 5%, c l = 0 unless otherwise specified min nom max unit recovery time, step load changes (t tld ) 4,5,6 half load to/from full load, notes 6,7 200 s output response to step line changes (v tln ) 4,5,6 4.5v to/from 5.5v i out = 100% rated load, notes 1, 8 -100 100 mv pk recovery time, step line changes (t tln ) 4,5,6 4.5v to/from 5.5v i out = 100% rated load, notes 1,7,8 200 s turn-on response overshoot (v os ) turn-on delay (t dly ) 4,5,6 no load, full load, note 9 0.5 100 10 mv ms capacitive load (c l ) 1 i out = 100% rated load no effect on dc performance notes 1, 4 10000 f line rejection 1 i out = 100% rated load dc to 50khz, note 1 28 db device weight 60 g mtbf mil-hdbk-217f2, sf, 40 c 2.8 x10 6 hr radiation performance characteristics test conditions min typ unit mil-prf-883, method 1019 total ionizing dose ( gamma ) operating bias applied during exposure, 100 krads (si) 2 / 3 rated load, v in = 5.0v single event effects heavy ions (let) seu, sel, segr, seb operating bias applied during exposure, 82 mev cm 2 /mg full rated load, vin = 5.5v test lab: cyclotron institute, texas a & m university downloaded from: http:///
www.irf.com 7 sbb seriessingle output block diagram input filter high-side gate drive uvlo pwm high-side switch low-side switch output filter low-side gate drive current controller enable interface voltage controller sync. interface clock generator current sense power ok sense output +sense vadjust input enable sync. in pok sync. out 10 case input return 8 9 11 12 3 5 output return 6 7 4 output 2 1 fig 1: typical efficiency @-55c - 1.2v output (for part number sbb501r2s) typical efficiency at -55 degrees c, 1.2v output sbb501r2s 50% 55% 60% 65% 70% 75% 80% 85% 01 234567891 01 11 21 31 4 output current, a efficiency, % vin = 4.5v vin = 5.0v vin = 5.5v downloaded from: http:///
8 www.irf.com sbb seriessingle output fig 2: typical efficiency @25c - 1.2v output (for part number sbb501r2s) typical efficiency at 25 degrees c, 1.2v output sbb501r2s 50% 55% 60% 65% 70% 75% 80% 85% 012345678 91 01 11 21 31 4 output current, a efficiency, % vin = 4.5v vin = 5.0v vin = 5.5v fig 3: typical efficiency @+85c - 1.2v output (for part number sbb501r2s) typical efficiency at +85 degrees c, 1.2v output sbb501r2s 50% 55% 60% 65% 70% 75% 80% 85% 01234567 891 01 11 21 31 4 output current, a efficiency, % vin = 4.5v vin = 5.0v vin = 5.5v downloaded from: http:///
www.irf.com 9 sbb seriessingle output fig 4: typical efficiency @ 25c - 1.5v output (for part number sbb501r5s) typical efficiency at 25 degrees c, 1.5v output p/n sbb501r5s 50% 55% 60% 65% 70% 75% 80% 85% 01234567891 01 11 21 31 41 5 output current, a efficiency, % vin = 4.5v vin = 5.0v vin = 5.5v fig 5:typical efficiency @ 25c - 3.3v output (for part number sbb503r3s) typical efficiency at 25 degrees c, 3.3v output sbb503r3s 70% 75% 80% 85% 90% 95% 01234567891 0 output current, a efficiency, % vin = 4.5v vin = 5.0v vin = 5.5v downloaded from: http:///
10 www.irf.com sbb seriessingle output mechanical outline pin designation pin # designation 1 input 2 input return 3 output return 4o u t p u t 5o u t p u t 6 +sense 7 vadjust 8s y n c i n 9s y n c o u t 10 enable 11 pok 12 case note: input and output returns are internally connected standard microcircuit ir standard drawing number part number 5962-1120601kxa sbb501s/cka 5962-1120601kxc sbb501s/ckc 5962-1120602kxa sbb501r2s/cka 5962-1120602kxc sbb501r2s/ckc 5962-1120603kxa sbb501r5s/cka 5962-1120603kxc sbb501r5s/ckc 5962-1120604kxa sbb501r8s/cka 5962-1120604kxc sbb501r8s/ckc 5962-1120605kxa sbb502r5s/cka 5962-1120605kxc sbb502r5s/ckc 5962-1120606kxa sbb503r3s/cka 5962-1120606kxc sbb503r3s/ckc standard microcircuit drawing equivalence table 0.375 1.15 1.900 1.50 1.75 2.000 0.30 0.55 4 places 0.050 max. 0.20 typ. non-cum. 0.128 0.040 pin 0.170 1.00 ref. 0.25 0.25 2.40 ref. 0.335 max. 0.25 5 eq. spaces 0.20 tolerance: .xx = 0.01 .xxx = 0.005 0.25 typ downloaded from: http:///
www.irf.com 11 sbb seriessingle output part numbering device screening requirement mil-std-883 method no suffix ck em temperature range -55c to +85c -55c to +85c -55c to +85c element evaluation mil-prf-38534 class k class k n/a non-destructive bond pull 2023 yes yes n/a internal visual 2017 yes yes temperature cycle 1010 cond c cond c cond c constant acceleration 2001, y1 axis 3000 gs 3000 gs 3000 gs pind 2020 cond a cond a n/a 320 hrs @ 125c 320 hrs @ 125c 48 hrs @ 125c ( 2 x 160 hrs ) ( 2 x 160 hrs ) final electrical mil-prf-38534 -55c, +25c, -55c, +25c, -55c , +25c, ( group a ) & specification +85c +85c +85c pda mil-prf-38534 2% 2% n/a seal, fine and gross 1014 cond a, c cond a, c cond a radiographic 2012 yes yes n/a external visual 2009 yes yes burn-in 1015 notes: best commercial practice. ck is a dla land and maritime ( formerl y dscc ) p art markin g used to desi g nate a class k com p liant h y brid. the ck marking does not indicate the hybrid is radiation certified. no suffix is a radiation rated device but not available as a dla land an d maritime qualified smd per mil-prf-38534. international rectifier currently does not have a dla land and maritime certified rad iation hardness assurance program . world headquarters: 233 kansas st., el segundo, california 90245, tel: (310) 252-7105 ir san jose: 2520 junction avenue, san jose, california 95134, tel: (408) 434-5000 visit us at www.irf.com for sales contact information . data and specifications subject to change without notice. 11/2012 output voltage model nominal input voltage 5 = 5v screening level (please refer to screening table) no suffix, ck, em 01 = 1v, 01r2 = 1.2v 01r5 = 1.5v, 01r8 = 1.8v 02r5 = 2.5v, 03r3 = 3.3v output s = single sbb 5 01 s /xx x lead finish for ck only a = solder dipped c = gold plated blank for no suffix and em lead finish for no suffix = gold plated lead finish for em is gold plated or solder dipped depending on availability sbb = 30 watts downloaded from: http:///

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