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MIC28510 evaluation board 75v/4a hyper speed control ? synchronous dc/dc buck regulator hyper speed control is a trademark of micrel, inc micrel inc. ? 2180 fortune drive ? san jose, ca 95131 ? usa ? tel +1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com march 2012 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 ge is adjustable down to 0.8v with sted the switching fre es in in and output luation board are: ? input voltage ? 5v to 75v output voltage ? 0.8v to 5v at 4a (1) (2) ? l tion can be s web site at: www.micrel.com general description the MIC28510 dc/dc regulator operate input supply range of 4.5v to 75v and regulated output at up to 4a of output cu output volta s o ver an pr ovides a rrent. the a uency is quency put voltage typical accuracy of 1%. the switching freq a djustable and once adju r emains fairly constant with chang load. t he basic parameters of the eva ? 12v at up to 4a 250khz switching frequency (adjustable from 100khz to 500khz) notes: 1, 2. refer to thermal de-rating curves shown in typica characteristics section. datasheets and support documenta found on micrel? nly a ngle pab y. a d an n r, has been installed on the board to provide housekeeping (v dd ) for the MIC28510. the output load can either be a passive or an active load. precautions the MIC28510 evaluation board does not have reverse polarity protection. applying a negative voltage to the pvin and gnd terminals may damage the device. the maximum pvin of the board is rated at 75v. exceeding 75v on the pvin could damage the device. wer supply to the vin careful attention to the e range (5v < vin < can be monitored with ly power until step 4. r output . connect a gnd terminals. the load can ve) or an active (as in current meter may be terminal and load to re the output out terminal. s an internal 100k tor to vdd, which allows the output to eds its uvlo tor is provided on the evaluation board for users to easily access the feature. applying an external logic signal n pin to pull it low or using a jumper to will shut off the output of n board. 4. turn on the power . turn on the vin supply and verify that the output voltage is regulated to 3.3v. ordering information part number description requirements the MIC28510 evaluation board requires o power supply with at leas t 10a current ca linear regulator, which includes a zener an transisto si ilit np getting started 1. v in supply . connect a po and gnd terminals, paying polarity and supply voltag 75v). the input current iin a current meter. do not app 2. connect load and monito load to the v out and be either a passive (resisti an electronic load) type. a placed between the v out monitor the output current. ensu voltage is monitored at the v 3. enable input . the en pin ha pull-up resis be turned on when vdd exce threshold. an en connec enable on the e short the en pin to gnd tio the MIC28510 evalua MIC28510 5v ev evaluation board up to 5v output MIC28510 12v ev evaluation board 12v output
micrel, inc. MIC28510 4a evaluation board features march 2012 2 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 MIC28510 evaluation board, which is preset to 3.3v, is determined by the feedback divider, shown in equation 1: feedback resistors the output voltage on the ? ? ? ? ? ? += bottom ref out r r4 1vv where v ref = 0.8v, and r bottom is one o which corresponds ? ? eq. 1 f r5-r12, to 0.9v, 1.0v, 1.2v, 1.5v, 1.8v, 2.5v, 3.3v, or 5v. leaving the r bottom open gives a 0.8v output voltage. all above can be set by modifying r bottom alu according to equation 2: other voltages not listed v e ref out ref bottom vv r ? = note that the output voltage should not be vr4 eq. 2 5v due to the 6.3v voltage rating o mmended hown in the MIC28510 12v/4a e output d for 12v ode ng the t critical nt limit om fet. t of easurement the resistor, r13, is placed in series with the reg feedback path. the control loop gain can be measured by connecting an impedance analyzer across the resistor and select ing the resistor value in between 20 ? to 50 ? . setting the switching frequency the MIC28510 is an adjustable-frequency, synchronous buck regulator featuring a unique digitally modified adaptive on-time control architecture. be adjusted between ng the resistor divider connected network consisting of r18 and r19 from pvin to pgnd. the switching frequency can 100khz and 500khz by changi figure 1. switching frequency adjustment switching frequency: equation 3 illustrates the estimated set to n the exceed r19r18 r19 f f o sw_adj + = output capacitors. if higher than 5v output is desired, it is reco to use the designs s eq. 3 where f o = switching frequency when r18 is 100k and r19 being open, f o should be typically 450khz. for more precise setting, it is recommended to use figure 2: output eva luation board schematic, where th capacitors, l1, r3, and r17 are optimize output. sw n test point j11 (v sw ) is placed for monitori switching waveform, one of the mos waveforms for the converter. current limit the MIC28510 has internal fets, and the curre is implemented by sensing the r ds-on of bott the MIC28510 has a fixed current limi (typical). loop gain m 6.5a ulator figure 2. switching frequency vs. r19 the evaluation board design is optimized for a switching frequency of 250khz. if the switching frequency is programmed to either lower end or higher end, the design needs optimization.
micrel, inc. MIC28510 4a evaluation board march 2012 3 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 MIC28510 0.8v to 5v/4a evaluati on board typical characteristics efficiency (v in = 48v) vs. output current 10 20 30 40 50 60 70 80 90 100 012345 output current (a) efficiency (%) 6 5.0v 3.3v 2.5v 1.8v 1.5v 1.2v 1.0v 0.9v 0.8v f sw = 250khz thermal derating 0 1 2 3 4 25 40 55 70 85 100 maximum ambient temperature (c) load current (a) v out = 3.3v fsw = 250khz l = 10h t j_max =125c v in = 5v v in = 75v v in = 48v thermal derating 0 1 2 3 4 25 40 55 70 85 100 maximum ambient temperature (c) load current (a) v out = 5v f sw = 250khz l = 10h t j_max = 125c v in = 8v v in = 75v v in = 48v thermal derating thermal derating 0 1 2 3 4 25 40 55 70 85 100 maximum ambient temperature (c) load current (a) v out = 3.3v f sw = 250khz l = 10h t j_max = 125c v in =18v v in = 12v v in = 24v thermal derating 0 1 2 3 4 25 40 55 70 85 100 maximum ambient temperature (c) load current (a) v out = 2.5v f sw = 250khz l = 10h t j_max = 125c v in =18v v in = 12v v in = 24v 0 l 1 2 3 4 25 40 55 70 85 100 maximum ambient temperature (c) oad current (a) v out = 5v f sw = 250khz l = 10h t j_max = 125c v in =18v v in = 24v v in = 12v die temperature* : the temperature measurement was taken at the hottest point on the MIC28510 case mounted on a 5 square inch 4 layer, 0.62?, fr-4 pcb with 2oz. finish copper weight per layer, see ther mal measurement section. actual results will depend upon the size of the pcb, ambient temperature and proximity to other heat emitting components.
micrel, inc. MIC28510 4a evaluation board march 2012 4 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 MIC28510 0.8v to 5v/4a output evaluation board schematic MIC28510 evaluation board for 0.8v to 5v/4a output
micrel, inc. MIC28510 4a evaluation board march 2012 5 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 ll of 0.8v to u item manufacturer description qty. bi materials 5v/4a o tput part number c1 eeu-fc2a10 1b pa or, smd, 100v 1 nasonic (1) 100f aluminum capacit grm32er72a22 5ka m 35l urata (2) c2, c3 25kt5 tdk x7r, size 1210, 100v 2 c3225x7r2a2 (3) 2.2f ceramic capacitor, grm32er60j10 7me m 20l urata (2) c13 mat2a avx 10, 6.3v 1 12106d107 (4) 100f ceramic capacitor, x5r, size 12 06035c104kat2 a avx (4) grm188r71h 104ka93d murata (2) c6 4k (3) 0.1f ceramic capacitor, x7r, size 0603, 50v 1 c1608x7r1h10 tdk grm188r72a 104ka35d murata (2) c10 k tdk (3) 0.1f ceramic capacitor, x7r, size 0603, 100v 1 c1608x7s2a104 0805zc225 mat2a avx (4) grm21br71a22 5ka murata (2) 01l c8, c9 1a225k 2.2f ceramic capacitor, x7r, size 0805, 10v 2 c2012x7r tdk (3) grm188r72a 102ka01d murata (2) c1608x7r2a10 2k tdk (3) c11 at2a avx , x7r, size 0603, 100v 1 06031c102k (4) 1nf ceramic capacitor grm188r 71h472ka01d murata (2) c1608 x7r2a472k tdk (3) c12 at2a avx (4) ramic capacitor, x7r, size 0603, 50v 1 06035 c472k 4.7nf ce grm 21br71a105k m a01l urata (2) c16 7r1a105 r, size 0805, 10v 1 c2012x k tdk (3) 1f ceramic capacitor, x7 c4, c5, c 14, c15 7, c open bat46w-tp mcc (5) d1 io schottky diode 1 bat46w-7-f d des inc. (6) small signal mmxz5232b-t p mcc (5) d2 en iode 1 cmdz5l6 c tral semi (7) 5.6v zener d l1 dr125-100-r cooper bussmann (8) 10h inductor, 5.35a rms, 7a saturation current 1 q1 fcx493 diodes inc/zetex (6) 100v npn transistor 1 r1 crcw06034r75fkea vishay dale (9) 4.75? resistor, size 0603, 1% 1 r2, r16 crcw08051r21fkea vishay dale (9) 1.21? resistor, size 0805, 1% 2 r3 crcw060316k5fkea vishay dale (9) 16.5k ? resistor, size 0603, 1% 1 r4 crcw060310k0fkea vishay dale (9) 10k ? resistor, size 0603, 1% 1 r5 crcw060380k6fkea vishay dale (9) 80.6k ? resistor, size 0603, 1% 1 r6 crcw060340k2fkea vishay dale (9) 40.2k ? resistor, size 0603, 1% 1
micrel, inc. MIC28510 4a evaluation board march 2012 6 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 ll of mat 8v output (co ) em mb description qty. bi erials 0. to 5v/4a ntinued it part nu er m anufacturer r7 0f r, size 0603, 1% 1 crcw060320k kea vi shay dale (9) 20k ? resisto r8 5f 3, 1% 1 crcw060311k kea vi shay dale (9) 11.5k ? resistor, size 060 r9 06f 3, 1% 1 crcw06038k kea vi shay dale (9) 8.06k ? resistor, size 060 r10 f 3, 1% 1 crcw06034k75 kea vi shay dale 4.75k ? (9) resistor, size 060 r11 24f istor, size 0603, 1% 1 crcw06033k kea vi shay dale (9) 3.24k ? res r12 91f stor, size 0603, 1% 1 crcw06031k kea vi shay dale (9) 1.91k ? resi r13 crcw06030000z , size 0603 1 0eahp vi shay dale (9) 0 ? resistor r14 crcw080510k 0j 5, 1% 1 nea vi shay dale 10k ? res (9) istor, size 080 r15 crcw060349r 9 , size 0603, 1% 1 fkea vi shay dale 49.9 ? resistor (9) r17 (op 603715r 1% en) crcw0 fkea vi shay dale (9) 715? resistor, size 0603, r1 8, r19 crcw0603100kfkeahp vishay dale (9) 100k ? resistor, size 0603, 1% 2 r20 crcw06 032 r00fkea vishay dale (9) 2 ? resistor, size 0603, 1% 1 r21 (open) c rcw0603348rfkea vishay dale (9) 348? resistor, size 0603, 1% u1 mi c28510yjl micrel. inc. (10) 75v/4a synchronous buck dc/dc regulator 1 notes: 1. panasonic: www.panasonic. com . 2. murata: www.murata.com . 3. tdk: www.tdk.com . 4. avx: www.avx.com . 5. mcc: www.mccsemi.com . 6. diode inc.: www.diodes.com . 7. central semi: www.centralsemi.com . 8. cooper: www.cooperbussman.com . 9. vishay: www.vishay.com . 10. micrel, inc.: www.micrel.com .
micrel, inc. MIC28510 4a evaluation board march 2012 7 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 MIC28510 12v/4a output evaluation board typical characteristics efficiency vs. output current 50 55 60 65 70 75 80 85 90 95 100 012345 6 efficiency (%) thermal derating 0 1 2 3 4 25 40 55 70 85 100 115 v out = 12v f sw =250khz l=27 h t j_max =125c 18v 24v 30v 48v 75v 24v in output current (a) v out = 12v f sw = 250khz l = 27 h maximum ambient temperature (c) load current (a) 18v in 48v in 75v in die temperature* : the temperature measurement was taken at the hottest point on the MIC28510 case mounted on a 5 square inch 4 layer, 0.62?, fr-4 pcb with 2oz. finish copper weight per layer, see ther mal measurement section. actual results will depend upon the size of the pcb, ambient temperature and proximity to other heat emitting components.
micrel, inc. MIC28510 4a evaluation board march 2012 8 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 MIC28510 12v/4a output evaluation board schematic MIC28510 evaluation board for 12v/4a output
micrel, inc. MIC28510 4a evaluation board march 2012 9 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 ll of (12v up qty. bi materials to 4a) output item part number man ufacturer description c1 eeu-fc2a10 1b a or, smd, 100v 1 p nasonic (1) 100f aluminum capacit grm32er61c476me 15 m (2) urata c2, c3 76mm- iyo yuden r, size 1210, 100v 2 emk325bj4 t ta (3) 2.2f ceramic capacitor, x7 grm32er6 1c476me15 murata (2) c13, c4 476mm-t taiyo yuden , x5r, size 1210, 16v 2 emk325bj (3) 47f ceramic capacitor 06035c104kat2a avx (4) grm188r71h 104ka93d murata (2) c6 c1608x7r1h 104k t (5) r, size 0603, 50v 1 dk 0.1f ceramic capacitor, x7 grm188r 72a104ka 35d murata (2) c10 k tdk (5) 0.1f ceramic capacitor, x7r, size 0603, 100v 1 c1608x7s2a104 0805zc225 mat2a avx (4) grm21br7 1a225ka01l murata (2) c8, c9 5k (5) 2.2f ceramic capacitor, x7r, size 0805, 10v 2 c2012x7r 1a22 tdk grm188r72a 102ka01d murata (2) c1608x7r2a10 2k (5) tdk c11 06031c102 kat2a avx r, size 0603, 100v 1 (4) 1nf ceramic capacitor, x7 grm188r 71h472ka01d murata (2) c1608 x7r2a472k (5) tdk c12 06035 c472kat2a avx capacitor, x7r, size 0603, 50v 1 (4) 4.7nf ceramic grm21br7 1a105ka m 01l urata (2) c16 x7r1a105k 1f ceramic capacitor, x7r, size 0805, 10v 1 c2012 tdk (5) c5, c7, c 15 en 14, op c bat46w-tp mcc (6) d1 io schottky diode 1 bat46w-7-f d des inc. (7) small signal mmxz5232b-t p mcc (6) d2 cmdz5l6 cen iode 1 tral semi (8) 5.6v zener d l1 7447709270 wurth (9) 27h inductor, 5.8a saturation current 1 q1 fcx493 diodes inc./zetex (7) 100v npn transistor 1 r1 crcw06034r75fkea vishay dale (10) 4.75? resistor, size 0603, 1% 1 r2, r16 crcw08051r21fkea vishay dale (10) 1.21? resistor, size 0805, 1% 2 r3 crcw060345k3fkea vishay dale (10) 45.3k ? resistor, size 0603, 1% 1 r4 crcw060310k0fkea vishay dale (10) 10k ? resistor, size 0603, 1% 1 r5 (open) crcw060380k6fkea vishay dale (10) 80.6k ? resistor, size 0603, 1% r6 (open) crcw060340k2fkea vishay dale (10) 40.2k ? resistor, size 0603, 1%
micrel, inc. MIC28510 4a evaluation board march 2012 10 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 b f mat v up utput (conti mbe a description qty. ill o erials 12 -to 4a o nued) item part nu r m nufacturer r7 (ope n) crcw060320 k0fk sh or, size 0603, 1% 1 ea vi ay dale (10) 20k ? resist r8 (ope n) crcw060311 k5fk sh stor, size 0603, 1% 1 ea vi ay dale (10) 11.5k ? resi r9 (ope n) crcw06038k 06fk sh stor, size 0603, 1% 1 ea vi ay dale (10) 8.06k ? resi r10 (op en) crcw06034k75fk sh istor, size 0603, 1% 1 ea vi ay dale 4.75k (10) ? res r11 (op 24fk sh sistor, size 0603, 1% 1 en) crcw06033k ea vi ay dale (10) 3.24k ? re r12 (op 91fk sh istor, size 0603, 1% 1 en) crcw06031k ea vi ay dale (10) 1.91k ? res r13 00z0 sh r, size 0603 1 crcw060300 eahp vi ay dale (10) 0 ? resisto r14 crcw080510 k0jn sh 5, 1% 1 ea vi ay dale 10k ? re (10) sistor, size 080 r15 crcw060349 r9fkea sh stor, size 0603, 1% 1 vi ay dale 49.9 ? resi (10) r17 603715rfk sh 1 crcw0 ea vi ay dale (10) 715? resistor, size 0603, 1% r1 8, r19 crcw0603100kfkeahp vishay dale (10) 100k ? resistor, size 0603, 1% 2 r20 crcw06 032 r00fkea vishay dale (10) 2 ? resistor, size 0603, 1% 1 r21 (open) crcw06033 48rfkea vishay dale (10) 348? resistor, size 0603, 1% u1 m ic28510yjl micrel. inc. (10) 75v/4a synchronous buck dc/dc regulator 1 no tes: 1. panasonic: www.pan asonic.com . 2. murata: www.murata.com . 3. taiyo yuden: www .t ai yo-yuden.com . 4. avx: www.avx.com . 5. tdk: www.tdk.com . 6. mcc: www.mccsemi.com . 7. diode inc.: www.diodes.com . 8. central semi: www.centralsemi.com . 9. wurth: www.wurth.com . 10. vishay dale: www.vishay.com . 11. micrel, inc.: www.micrel.com .
micrel, inc. MIC28510 4a evaluation board march 2012 11 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 evaluation board pcb layout MIC28510 evaluation board ? silkscreen top MIC28510 evaluation board ? copper layer 1 (top)
micrel, inc. MIC28510 4a evaluation board march 2012 12 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 evaluation board pcb layout (continued) MIC28510 evaluation board ? copper layer 2 MIC28510 evaluation board ? copper layer 3
micrel, inc. MIC28510 4a evaluation board march 2012 13 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 evaluation board pcb layout (continued) MIC28510 evaluation board ? copper layer 4 MIC28510 evaluation board ? silkscreen bottom
micrel, inc. MIC28510 4a evaluation board march 2012 14 m9999-030712 hbwhelp@micrel.com or (408) 955-1690 micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel +1 (408) 944-0800 fax +1 (408) 474-1000 web ://www.micrel.com http micrel makes no representations or warranties with respect to the accuracy or comple teness of the information furnished in this data sheet. this information is not intended as a warranty and micrel does not assume responsibility for it s use. micrel reserves the right to change circuitry, specifications and descriptions at any time without notice. no license, whether express, implied, arising by estoppel or other wise, to any intellectual property rights is granted by this document. except as provided in micrel?s terms and conditions of sale for such products, mi crel assumes no liability whatsoever, and mi crel disclaims any express or implied warranty rela ting to the sale and/or use of micrel products i ncluding liability or warranties relating to fitness for a particular purpose, merchantab ility, or infringement of any patent, copyright or other int ellectual property right. micrel products are not designed or authorized for use as components in life suppor t appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. li fe support devices or systems are devices or systems that (a ) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to resul t in a significant injury to the user. a purchaser?s use or sale of micrel products for use in life support app liances, devices or systems is a purchaser ?s own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2012 micrel, incor p orated.

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