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dsp switcher? power modules 88mg815/88mg816, 1a r ated output current 88mg830/88mg831, 2a r ated output current non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions preliminary specificat ions, patent pending doc. no. mv-s101948-00, rev. d february 21, 2006
no part of this document may be reproduced or transmitted in any form or by any means, electronic or mechanical, including phot ocopying and recording, for any purpose, without the express written permission of marvell. marvell retains the right to make changes to this document at any time, without notice. marvell makes no warranty of any kind, expressed or implied, with regard to any information contained in this document, including, but not limited to, the implied warranties of merchantability or fitn ess for any particular purpose. further, marvell does not warrant the accuracy or completeness of the information, text, graphics, or other items contained within this document. marvell products are not designed for use in life-support equipment or applications that would cause a life-threatening situati on if any such products failed. do not use marvell products in these types of equipment or applications. with respect to the products described herein, the user or recipient, in the absence of appropriate u.s. government authorizati on, agrees: 1) not to re-export or release any such information consisting of technology, software or source code controlled for national s ecurity reasons by the u.s. export control regulations ("ear"), to a national of ear country groups d:1 or e:2; 2) not to export the direct product of such technology or such software, to ear country groups d: 1 or e:2, if such technology o r software and direct products thereof are controlled for national security reasons by the ear; and, 3) in the case of technology controlled for national security reasons under the ear where the direct product of the technology is a complete plant or component of a plant, not to export to ear country groups d:1 or e:2 the direct product of the plant or major component thereof, if such direct product is controlled for national security reasons by the ear, or is subject to controls under the u.s. munitions list ("usml"). at all times hereunder, the recipient of any such information agrees that they shall be deemed to have manually signed this doc ument in connection with their receipt of any such information. copyright ? . marvell international ltd. all rights reserved. marvell, the marvell logo, moving forward faster, alaska, fastwr iter, datacom systems on silicon, libertas, link street, netgx, phyadvantage, prestera, raising the technology bar, the technology within, virtual cable tester, and yukon are registered trade marks of marvell. ants, anyvoltage, discovery, dsp switcher, feroceon, galnet, galtis, horizon, marvell makes it a ll possible, radlan, unimac, and vct are trademarks of marvell. all other trademarks are the property of their respective owners. 88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00 rev. d copyright@ 2005 marvell page 2 document classification: proprietary information february 21, 2006, preliminary document status advance information this document contains design specifications for in itial product development. specifications may change without notice. contact marvell field application engineers for more information. preliminary information this document contains preliminary data, and a revision of this document will be published at a later date. specifications may change without notice. contact marvell field application engineers for more information. final information this document contains specifications on a product that is in final releas e. specifications may change without notice. contact marvell field application engineers for more information. revision code: rev. d preliminary technical publication: 2.0
non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions 88mg815/88mg816/88mg830/88mg831 copyright@ 2005 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 3 f eatures /b enefits ? true lead- free "plug-n-play" solution ? no external components required - except a sin- gle voltage programming resistor ? tiny footprint, vertical and horizontal options ? input voltage range: 3v to 5.5v ? programmable output vo ltage: 0.72v to 3.63v ? 2% output voltage tolerance ? 1 mhz switching frequency ? 95% efficiency?no heatsink required ? 2.5v and 3.3v ldo secondary voltage versions ? ultra-fast transient response ? low output ripple and noise ? anyvoltage? technology provides 64 output selections and shortens design cycles ? output voltage marginin g capability for easy sys- tem testing and qualification ? high reliability - lowest component count ? works with any external capacitive load (low esr, high esr) ? built-in undervoltage lockout, thermal protection, and current limit ? control ic and passive kit components are avail- able for high volume user sip package dip package (tbd) smt package
doc. no. mv-s100649-00, rev a copyright@ 2005 marvell page 4 document classification: proprietary information february 21, 2006, preliminary 88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions o verview the 88mg815/88mg816/8 8mg830/88mg831 is a high-performance, non-isolated, dc-dc converter module for point-of-load (pol ) applications. it func- tions as a synchronous st ep-down (buck) switching regulator in a small form factor. the module includes a proprietary marvell ? integrated regulator device. the switching frequency for the regulator is 1 mhz, and no external components are required (except one voltage programming resistor, see section 2.1 "output voltage - anyvoltage? technology" on page 14 ). ultra-high conversion efficiency (typically 95%) allows for the use of the 88m g815/88mg816/88mg830/ 88mg831 without any heatsink. additionally, the 88mg815/88mg816/88mg830/ 88mg831 includes an innovative single resistor method 1 to program the out- put voltage. this voltage is defined by the user with an external resistor. the 88mg815/88mg816/8 8mg830/88mg831 oper- ates from an input voltage range of 3v to 5.5v, making the device well suited for portable applications. the output voltage range is 0.72v to 3.63v, supporting future devices down to 65 nm geometries. other key features include an internal current limit, an undervoltage lockout, a thermal shutdown, and an ambient temperature range of -40c to 85c a pplications ? point-of-load power supplies ? networking/datacom systems ? portable computing ? workstation and servers ? dsp power supplies ? lan/wan ? enterprise networks ? industrial controls 1. patent pending
copyright@ 2005 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 5 d evice f eature d ifferences table below summarizes the feature differ ences between 88mg815/88 mg816/88mg830/88mg831. p roduct selector table features 88mg815z-x 88mg816-x 88mg830z-x 88mg831-x rated output curr ent 1.0a 1.0a 2.0a 2.0a packages ("-x" package code options -s ->sip -d ->dip -t ->smt) ? 8-pin sip ? 7-pin dip ? 7-pin smt ? 7-pin sip ? 6-pin dip ? 6-pin smt ? 8-pin sip ? 7-pin dip ? 7-pin smt ? 7-pin sip ? 6-pin dip ? 6-pin smt ldo "z" voltage option b = 3.3v e = 2.5v no ldo b = 3.3v e = 2.5v no ldo part number description ldo output voltage rated output current 1 1. the maximum continuous output current while maintaini ng output voltage regulation is determined by thermal con- straints. refer to the output current temperature derating curves. package 88mg815b-s sip module: 1a rated output switching reg. with ldo 3.3v 1.0a 9-pin sip 88mg815e-s sip module: 1a rated output switching reg. with ldo 2.5v 1.0a 9-pin sip 88mg815b-d dip module: 1a rated output switching reg. with ldo 3.3v 1.0a 7-pin dip 88mg815e-d dip module: 1a rated output switching reg. with ldo 2.5v 1.0a 7-pin dip 88mg815b-t smt module: 1a rated output switching reg. with ldo 3.3v 1.0a 7-pin smt 88mg815e-t smt module: 1a rated output switching reg. with ldo 2.5v 1.0a 7-pin smt 88mg816-s sip module: 1a rated output switching reg. -- 1.0a 8-pin sip 88mg816-d dip module: 1a rated output switching reg. -- 1.0a 6-pin dip 88mg816-t smt module: 1a rated output switching reg. -- 1.0a 6-pin smt 88mg830b-s sip module: 2a rated output switching reg. with ldo 3.3v 2.0a 9-pin sip 88mg830e-s sip module: 2a rated output switching reg. with ldo 2.5v 2.0a 9-pin sip 88mg830b-d dip module: 2a rated output switching reg. with ldo 3.3v 2.0a 7-pin dip 88mg830e-d dip module: 2a rated output switching reg. with ldo 2.5v 2.0a 7-pin dip 88mG830B-T smt module: 2a rated output switching reg. with ldo 3.3v 2.0a 7-pin smt 88mg830e-t smt module: 2a rated output switching reg. with ldo 2.5v 2.0a 7-pin smt 88mg831-s sip module: 2a rated output switching reg. -- 2.0a 8-pin sip 88mg831-d dip module: 2a rated output switching reg. -- 2.0a 6-pin dip 88mg831-t smt module: 2a rated output switching reg. -- 2.0a 6-pin smt
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 6 document classification: proprietary information february 21, 2006, preliminary table of contents s ection 1. s ignal d escription .............. .............. .............. .............. ......... 10 1.1 pin diagram for 88mg815z & 88mg830z ...... ..............................................................10 1.2 pin diagram for 88mg816 & 88mg831.......... ................. ................ ................ .............11 1.3 pin description ............................................................................................................. 12 1.4 pin assignment table ..................................................................................................13 s ection 2. f unctional d escription ............... ................ ............... ........... 14 2.1 output voltage - anyvolta ge? technology ..............................................................14 2.2 output voltage margining..... .......................................................................................16 2.3 ldo versions................................................................................................................ 17 2.3.1 ldo output voltage ........................................................................................................ .17 2.4 regulation and start-up...............................................................................................18 2.5 digital soft start .......................................................................................................... .18 2.6 undervoltage lockout (uvlo) ....................................................................................19 2.7 thermal shutdown .......................................................................................................19 s ection 3. e lectrical s pecifications ............. .............. ............... ........... 20 3.1 absolute maximum ratings ........................................................................................20 3.2 recommended operating conditions .......................................................................20 3.3 electrical characteristics. ............................................................................................21 s ection 4. f unctional c haracteristics .............. .............. ............ ......... 24 4.1 startup waveforms.......................................................................................................24 4.2 load transient response waveforms .......................................................................27 4.2.1 88mg830 step-down regulator . .............. .............. .............. .............. ........... ........... ....... 27 4.2.2 ldo regulator............................................................................................................. ..... 28 4.3 switching waveforms ..................................................................................................29 4.4 efficiency.................................................................................................................. .....30 4.5 considerations for bench testing and hot plug applications ................................31 4.5.1 hot plug solution......................................................................................................... ..... 31
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 7 4.5.2 hot plug protection for bench testing and wall wart applications................................... 31 s ection 5. m echanical d rawings ................. ................ ................. ..........32 5.1 mechanical dimensions for 88mg815z & 88mg830z................................................ 32 5.2 mechanical dimensions for 88mg816 & 88mg831 ................................................... 35 s ection 6. o rdering i nformation ................. ................ ................. ..........38 6.1 ordering part numbers and package mark ings ....................................................... 38 6.2 sample ordering part number ................................................................................... 39 6.3 package marking.......................................................................................................... 40 6.3.1 88mg815z package marking ........................................................................................... 40
doc. no. mv-s101948-00 rev. d copyright@ 2005 page 8 document classification: proprietary information february 21, 2006, preliminary 88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions list of tables table 1: any voltage programming table for 5% resistor s ........................................................................ ..... 14 table 2: anyvoltage? programming table for 1% resistor s........................................................................ ... 15 table 3: absolute maximum ratings . .............................................................................................. ................... 20 table 4: recommended operating conditi ons ....................................................................................... ........... 20 table 5: electrical characteristics ...................... ....................................................................... ......................... 21 table 6: 88mg815/88mg816, 1a rated out put current electrical characteristic s .............. ........... ............ ...... 22 table 7: 88mg830/88mg831, 2a rated out put current electrical characteristic s .............. ........... ............ ...... 22 table 8: ldo output electrical characteristics ....... ........................................................................... ................ 23 table 9: ordering part numbers .................................................................................................. ...................... 39 table 10: marking specification table ........................................................................................... ...................... 41
copyright ? 2006 marvell doc. no. mv-s101948-00 rev. d february 21, 2006, preliminary document classi fication: proprietary information page 9 list of figures figure 1: 88mg815z & 88mg830z package - component view.... .............. .............. .............. .............. ........... 10 figure 2: connection block configuration sample for 88 mg815z & 88mg830z .............................................. 10 figure 3: 88mg816 & 88mg831 package - component view .......................................................................... 11 figure 4: connection block configuration sample for 88 mg816 & 88mg831 .................................................. 11 figure 5: output voltage margining for 88mg815z & 88mg8 30z ..................................................................... 1 6 figure 6: output voltage margining for 88mg816 & 88mg83 1........................................................................ .17 figure 7: output voltage window ................................................................................................. ..................... 18 figure 8: 88mg815z & 88mg830z sip series mechanical dimensions ......... .............. .............. .............. ........ 32 figure 9: 88mg815z & 88mg830z dip series mechanical dimensions ......... .............. .............. .............. ........ 33 figure 10: 88mg815z & 88mg830z smt seri es mechanical dimensions ............. .............. ........... ........... ........ 34 figure 11: 88mg816 & 88mg831 sip seri es mechanical dimensions............................................................... 35 figure 12: 88mg816 & 88mg831 dip series mechanical dimensions............................................................... 36 figure 13: 88mg816 & 88mg831 smt seri es mechanical dimensions .............. ............................................... 37 figure 14: 88mg815z & 88mg830z part number................. .............. .............. .............. .............. ............. ......... 38 figure 15: 88mg816 & 88mg831 part number ........................................................................................ .......... 38 figure 16: 88mg815z package marking ....................... ...................................................................... ................ 40
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 10 document classification: proprietary information february 21, 2006, preliminary section 1. signal description 1.1 pin diagram for 88mg815z & 88mg830z figure 1: 88mg815z & 88mg830z package - component view figure 2: connection block configuration sample for 88mg815z & 88mg830z 5 6 7 vout gnd vin vset pset shdn ldo_ out 1 2 34 z -d 88mg815 z- 88mg830 d z-t 88mg815 - zt 88mg830 88mg815z-s 88mg830 z-s p set gn d vset vin shdn gnd 17 6 5 4 3 289 t ldo_ou vout missing pin ponl t oi a z z - 88mg 88 815 830 mg s - s 3v-5.5v ldo_out vout vset t pse n gd load gnd vin shdn
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 11 signal description pin diagram for 88mg816 & 88mg831 1.2 pin diagram for 88mg816 & 88mg831 figure 3: 88mg816 & 88mg831 package - component view figure 4: connection block configuration sample for 88mg816 & 88mg831 vout vin gnd vset pset shdn 6 54 1 2 3 88 mg 816-d 88 mg 831-d 88 mg 816-t 88 mg 831-t vout gnd vin shdn gnd vset pse t 17 6 5 4 3 28 88mg816-s 88mg831-s missing pin o p optional load set gnd vset vut missing pin gnd vin sh d n 3v-5.5v 88 mg 88 mg816-s 831-s
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 12 document classification: proprietary information february 21, 2006, preliminary 1.3 pin description name pin description ldo_out 1 1. this pin is present in 88mg815z & 88mg830z only. secondary output voltage. connect directly to load with a short wide pcb trace. pset percent set. an external resistor is connected to the ground to trim the set voltage by the percentage value. see table 1 in the section 2.1 "output voltage - anyvoltage? technology" on page 14 for resistor values and percentage options. a resistor with tolerance better than 5% can be used. the total capacitance between this pin and gnd should be less than 25 pf. shorting this pin to ground, floating this pin, or using r pset > 619k or r pset < 7.68k does not affect the set voltage. if this pin is not used, it should be tied to gnd. gnd power ground. connect all gnd pins to a suitable low-impedance ground plane. nc not connected. no pin. vset voltage set. an external resistor is connected to ground to set the output voltage of the switching reg- ulator. see table 1 in the section 2.1 "output voltage - anyvoltage? technology" on page 14 for resistor values and output voltage options. a resistor with tolerance better than 5% can be used. the total capacitance across this pin and gnd should be less than 25 pf. shorting this pin to ground, floating this pin, or using r vset > 619k or r vset < 7.68k disables the switching regulator. vout switch output voltage. connect directly to load with a short wide pcb trace. ldo_out ldo output voltage. connect directly to load with a wide, low impedance pcb trace. vin 3v - 5.5v input voltage. shdn shutdown. logic low ( 0.8v) enables the regulator. logic high ( 2.0v) disables the regulator. the high signal has to be at least 20 s long to disable the regulator.
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 13 signal description pin assignment table 1.4 pin assignment table name 88mg815z-s 88mg830z-s 88mg815z-d/t 88mg830z-d/t 88mg816-s 88mg831-s 88mg816-d/t 88mg831-d/t ldo_out 1 1 - - pset 2 6 1 5 gnd 3,7 3 2,6 2 missing pin 4 - 3 - vset 5 5 4 4 vout6251 vin 8 4 7 3 shdn9786
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 14 document classification: proprietary information february 21, 2006, preliminary section 2. functional description 2.1 output voltage - anyvoltage? technology the output voltage of the 88mg815/ 88mg816/88mg830/88mg831 series is programmed by using the look-up table 1 or table 2 to select the resistor value for the vset and pset pins. the vset pin sets the output voltage, and the pset pin trims the set voltage to a percentage value. for example, using table 1 to program 2.25v output, a 165k resistor is selected for the vset pin, and an 11k resistor is se lected for the pset pin. the 160k resistor sets the output voltage to 2.5v and the 11k resistor trims the set voltage off by 10% (or -10%). using a resistor value greater than 619k or less than 7.68k for the vset pin disables the switching regulator and sets the sw pin to high impedance. using a re sistor value greater than 619k or less than 7.68k for the pset pin does not affect the se t voltage. if not used, the pset pin should be tied to ground. using the vset resistor's value greater than 619 kohm or less than 7.68 kohm disables the step-down switching regulator and sets the sw pin to high impedance. if the vset resistor's value is outside the 5% toler- ance, the output can be either higher or lower than the set voltage. using resistor value greater than 619 ko hm or less than 7.68 kohm for the pset pin does not affect the set volt- age. when the pset pin is not used, it must be connected to ground. like the vser resistor, the percent value can be either higher or lower if the pser resi stor's value is outs ide the 5% tolerance. table 1: any voltage programming table for 5% resistors pset -10.0% ?7.5% ?5.0% ?2.5% 0% 2.5% 5.0% 7.5% 10.0% 11k 18k 30k 51k gnd 100k 160k 270k 470k vset 11k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880 18k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 30k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320 51k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650 100k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980 160k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750 270k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300 470k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 15 functional description output voltage - anyvoltage? technology the vset and pset resistor are read once during start-up before the output vo ltage is turned on. after the output voltage is turned on, the vset and pset resisters are ignored.this ascertains that the output vo ltage tolerance is not dependant upon the tolerance or therma l characteristics of these resistors. table 2: anyvoltage? programming table for 1% resistors pset -10.0% ?7.5% ?5.0% ?2.5% 2.5% 5.0% 7.5% 10.0% 11k 18.7k 31.6k 53.6k open / gnd 97.6k 165k 280k 475k vset gnd 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 11k 0.720 0.740 0.760 0.780 0.800 0.820 0.840 0.860 0.880 18.7k 0.900 0.925 0.950 0.975 1.000 1.025 1.050 1.075 1.100 31.6k 1.080 1.110 1.140 1.170 1.200 1.230 1.260 1.290 1.320 53.6k 1.350 1.388 1.425 1.463 1.500 1.538 1.575 1.613 1.650 97.6k 1.620 1.665 1.710 1.755 1.800 1.845 1.890 1.935 1.980 165k 2.250 2.313 2.375 2.438 2.500 2.563 2.625 2.688 2.750 280k 2.700 2.775 2.850 2.925 3.000 3.075 3.150 3.225 3.300 475k 2.970 3.053 3.135 3.218 3.300 3.383 3.465 3.548 3.630 open 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000 0.000
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 16 document classification: proprietary information february 21, 2006, preliminary 2.2 output voltage margining a useful application of the marvell ? anyvoltage? technology is ?output voltage margining?. voltage margining is commonly used during system qualificatio n to evaluate operation at ?corner? conditions of volt age, temperature etc. typically, output voltage will be offset up and down by some percentage (margin) of the nominal value. for the 88mg815/88mg816/88mg8 30/88mg831 series the vset pin/ resistor controls the nomin al voltage of the switch- ing regulator output while the pset pin/resistor controls the marg in voltage. as can be seen in ta b l e 1 , the pset pin allows the margin to be set as high as 10% above and as low as -10% below the nominal setpoint established by vset. depending on the value of the pset resistor intermediate points of 7.5%, 5% and 2.5% ca n also be accessed. for example, if an application calls for a nominal output voltage of 1.5v then ta b l e 1 prescribes a value of r1 for the vset resistor. this selection is shown in figure 6 connected to the vset pin. to offset the voltage above and below the nominal value, the pset pin can be used with re sistor values again from ta b l e 1 . additionally, switches s1 and s2 can be alternately closed to select from the two resistors - r3 and r2 (offset values) for pset. if more offsets are required more switches and resistors may be us ed. as shown in the figures below, if s1 is closed and s2 opened a positive 5% offset would be added to the nominal 1.5v output yielding 1.575v. conversely, if s1 is opened and s2 closed the output would be offset to -5% from 1.5v, or 1.425v. finally with both s1 and s2 opened the output would return to the nominal 1.5v. thus volt age margining can be simply and reliably implemented with a minimum of components and design effort. figure 5: output voltage margining for 88mg815z & 88mg830z 88mg815z 88mg830z ldo_out load2 gnd vin shdn gnd 3.0v-5.5v vset pset load1 buck_out r1 r2 s1 s2 r3
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 17 functional description ldo versions 2.3 ldo versions the 88mg815z and 88mg830z versions ha ve a second output voltage regulated as a low dropout linear regula- tor. this is identified by the ldo_out output. the ldo controller is part of the marvell? power ic on the module. the linear pass element is a small p-channel mosfet. the ldo output is enabled immediately after the shdn pin is pulled low. 2.3.1 ldo output voltage the fixed output voltage of the ldo is either 3.3v or 2.5v, depending upon th e selected version of the module.the ?z? in the part number determines this. if z = b, then ldo_out = 3.3v, if z = e then ldo_out = 2.5v. the ldo is short-circuit protected to a current of approximately 1a. the out put current rating of the ldo is 450 ma continuous over the industrial temp erature range. it is thermally limite d because of the limited copper area available on the module for heat dissip ation. the module can deliver peak curr ents of 800 ma for very brief times, such as 1 ms without damage. figure 6: output voltage margining for 88mg816 & 88mg831 88mg816 88mg831 vout load gnd vin shdn gnd 3v-5.5v vset pset r1 r2 s1 s2 r3
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 18 document classification: proprietary information february 21, 2006, preliminary 2.4 regulation and start-up the step-down switching regulator uses pulse width modulation (pwm) and pulse frequency modulation (pfm) modes to regulate the output voltage using digital contro l. the mode of operation depends on the level of output current and the output voltage. in steady states, the step-down switching regulator monito rs the current flowing through the inductor to determine if the regulator is handling heavy or light load applicatio ns. for heavy load applications, the step-down regulator operates in the pwm mode (b and c) to minimize the ripple current for optimum efficiency and to minimize the rip- ple output voltage. the step-down r egulator operates in the pfm and disc ontinuous conduction mode (dcm) (a and d) to limit the switching action for optimum efficiency in light load applications. in this mode, the average out- put voltage is slightly higher than the average output voltage for heavy transient load applications. figure 7: output voltage window 2.5 digital soft start during start-up, the 88mg815/88mg816, 1a rated output current provides a soft start function. soft start reduces surge currents from input voltage and provides a well-controlled output voltage rise characteristics. the rate of the output voltage start-up is limited by the value of the output capacitor and the internal current limit cir- cuitry. this combination forces the output voltage to co me up slowly, providing a soft-start characteristic. during soft start, the 88mg815/88mg816, 1a rated output current feeds a constant current to the output capac- itor in several steps. figure 4 of the mvpg15x/16 data sheet shows the inductor current waveform during startup. the current limit is ramped up in 7 steps beginning at approximately 40% of the current limit rating and ending at 100% at 25 s per step. the buck regulator behaves like a cu rrent source during this time as the output ramps up slowly. typical v out pfm mode pwm moed pfm mode a b d c
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 19 functional description undervoltage lockout (uvlo) 2.6 undervoltage lockout (uvlo) the 88mg815/88mg816/88m g830/88mg831 series incorporates undervo ltage-lockout circuitry to disable the step-down regulator when the input voltage is below 2.75 v (typical). the step-down regulator is enabled when the input voltage is above 2.85v (typical). 2.7 thermal shutdown if the junction temperature of the control ic on 88mg815/88mg816/88mg830/88m g831 series exceeds 150c (typical), the thermal shutdown circuitry disables the step-down regulator. the st ep-down regulator is enabled when the junction temperature falls to 120c (typical).
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 20 document classification: proprietary information february 21, 2006, preliminary section 3. electrical specifications 3.1 absolute maximum ratings 3.2 recommended operating conditions table 3: absolute maximum ratings stresses above those listed in absolute maximum ratings may caus e permanent device failure. functionality at or above those lim its is not implied. exposure to absolute maximum ratings for extended periods may affect device reliability. parameter symbol range units input voltage to gnd v in -0.3 to 6.0 v voltage set to gnd v set -0.6 to (v in + 0.3) v percentage set voltage to gnd v pset -0.6 to (v in + 0.3) v shutdown voltage to gnd v shdn -0.6 to (v in + 0.3) v storage temperature range t stor -65 to +150 c output current (peak switch current) for 88mg815z & 88mg816 i peak 1.5 a output current (peak switch current) for 88mg830z & 88mg831 i peak 3.0 a rated output current fo r 88mg815z & 88mg816 i out 1a rated output current for 88mg830z & 88mg831 i out 2a ldo current i outldo 450 ma table 4: recommended operating conditions 1 1. this device is not guaranteed to functi on outside the specified operating range. parameter symbol range units input voltage v in 3 to 5.5 v operating temperature range 2 2. this device is guaranteed to meet the specifications from 0c to 70c. any specifications that per- tains to the operating temperature range -40c to +85c are assured by design, characterization, and correlation with statistical process controls. t op -40 to +85 c
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 21 electrical specifications electrical characteristics 3.3 electrical characteristics table 5: electrical characteristics the following applies unless otherwise noted: v in = 5.0v. t a = 25c . bold values indicate ?40c t a 85c . parameter symbol condition min typ max units input voltage range v in 3.0 5.5 v total quiescent current (no load) i in 1.3 ma shutdown supply current i in v shdn = v in = 5.5v 1 10 a undervoltage lockout v uvlo high threshold, v in increasing 2.85 3.00 v low threshold, v in decreasing 2.65 2.75 v shutdown input voltage logic v shdn enable regulator 0.8 v disable regulator 2.0 v shutdown input current i shdn v shdn = gnd or 5.5v 1 a over-temperature thermal shutdown t ots t j increasing (disable regulator) 150 c t j decreasing (enable regulator) 120 c switching frequency f sw 1mhz electrical material rating flammability rating ul94v-0 material type tbd
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 22 document classification: proprietary information february 21, 2006, preliminary table 6: 88mg815/88mg816, 1a rated outp ut current electrical characteristics parameter symbol condition min typ max units line regulation i out = 1a 0.2 % v in = 3.0v to 5.5v load regulation i out = 0.2a to 2.0a 0.5 % line regulation ldo i out = 800 ma v in = 4.0v to 5.5v 0.2 % load regulation ldo i out = 10 ma to 800 ma 0.5 % input current ripple i in ripple v out = 0.8v i out = 1a (without external filter) 15 ma pk-pk input voltage ripple v in ripple 50 mv pk-pk output voltage accuracy 2 % output voltage noise i out = 2.0a v out = 1.8v 8.0 mv rms table 7: 88mg830/88mg831, 2a rated outp ut current electrical characteristics parameter symbol condition min typ max units line regulation i out = 2a 0.2 % v in = 3.0v to 5.5v load regulation i out = 0.2a to 2.0a 0.5 % line regulation ldo i out = 800 ma v in = 4.0v to 5.5v 0.2 % load regulation ldo i out = 10 ma to 800 ma 0.5 % input current ripple i in ripple v out = 0.8v i out = 2a (without external filter) 15 ma pk-pk input voltage ripple v in ripple 50 mv pk-pk output voltage accuracy 2 % output voltage noise i out = 2.0a v out = 1.8v 8.0 mv rms
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 23 electrical specifications electrical characteristics table 8: ldo output elect rical characteristics parameter symbol condition min typ max units line regulation i out = 1a 0.2 % v in = 3.0v to 5.5v load regulation i out = 0.25a to 1.0a 0.5 % output voltage accuracy 2 %
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulato r module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00 rev. d copyright ? 2006 marvell page 24 document classification: proprietary information february 21, 2006, preliminary section 4. functional characteristics 4.1 startup waveforms note: there is a delay (3.5 ms typ) before the output voltage turns on. the actual threshold is before delay. v ldo v buck v shdn start-up using th e shutdown pin 2v/div 500mv/div 2v/div v ldo v buck v shdn turn off using the shutdown pin 2v/div 500mv/div 2v/div 1 ms/div 1 ms/div v in = 5.0v t dly ~ 3.5 ms v in = 5.0v v ldo = 3.3v v ldo = 3.3v v buck = 1.2v v buck = 1.2v i load = no load i load = no load v ldo v buck v shdn enable threshold at v in = 3.0v 2v/div 1v/div 1v/div v ldo v buck v shdn enable threshold at v in = 5.0v 2v/div 1v/div 1v/div 100 ms/div 100 ms/div v in = 5.0v v th = 0.7v (note) v in = 5.0v v th = 0.9v (note) v ldo = 3.3v v ldo = 3.3v v buck = 1.2v v buck = 1.2v i load = 10 ma i load = 10 ma
functional characteristics startup waveforms copyright ? 2006 marvell doc. no. mv-s101948-00 rev. d february 21, 2006, preliminary document classi fication: proprietary information page 25 note: graph shows the full range of soft start current limit. this test was conducted under an output overload condi- tion and the output voltage is not in regulation. realistically, this condition would result in thermal shutdown in a short time. v in v ldo v buck vin soft start 5v/div 2v/div 1v/div v in v ldo v buck vin hot plug 5v/div 2v/div 1v/div 2 ms/div 1 ms/div v in = 5.0v v in = 5.0v v ldo = 3.3v v ldo = 3.3v v buck = 1.2v v buck = 1.2v i load = no load i load = no load v out i ind 88mg830 step-down output rise time 500mv/div 1a/div i ind 88mg830 soft start current limit (see note) 1a/div 5 s/div 50 s/div v in = 5.0v v in = 5.0v v out = 1.2v v out = 3.3v i load = 500 ma _
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulato r module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00 rev. d copyright ? 2006 marvell page 26 document classification: proprietary information february 21, 2006, preliminary v in v ldo v buck uvlo thresholds 2v/div 2v/div 2v/div 10 ms/div v in = 5.0v v hth = 2.966v v ldo = 3.3v v lth = 2.767v v buck = 1.2v i load = 10 ma
functional characteristics load transient response waveforms copyright ? 2006 marvell doc. no. mv-s101948-00 rev. d february 21, 2006, preliminary document classi fication: proprietary information page 27 4.2 load transient response waveforms 4.2.1 88mg830 step-down regulator v buck i load load transient response 100mv/div 2a/div v buck i load double-pulsed load response 100mv/div 2a/div 20 s/div 20 s/div v in = 5.0v i load = 0.2a to 2a v in = 5.0v i load = 0.2a to 2a v buck = 1.2v t rise = 6a/ sv buck = 1.2v t rise = 6a/ s c out = 22 ft fall = 129a/ sc out = 22 ft fall = 129a/ s v buck i load load transient response (additional output capacitance) 100mv/div 2a/div v buck i load double-pulsed load response 100mv/div 2a/div 20 s/div 20 s/div v in = 5.0v i load = 0.2a to 2a v in = 5.0v i load = 0.2a to 2a v buck = 1.2v t rise ~ 6a/ sv buck = 1.2v t rise ~ 6a/ s additional c out = 22 ft fall ~ 129a/ s additional c out = 22 ft fall ~ 129a/ s
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulato r module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00 rev. d copyright ? 2006 marvell page 28 document classification: proprietary information february 21, 2006, preliminary 4.2.2 ldo regulator v buck i load load transient response (2 x addi- tional output capacitance) 100mv/div 2a/div v buck i load double-pulsed load response 100mv/div 2a/div 20 s/div 20 s/div v in = 5.0v i load = 0.2a to 2a v in = 5.0v i load = 0.2a to 2a v buck = 1.2v v buck = 1.2v additional c out = 2x22 f additional c out = 2x22 f v buck i load load transient response 50mv/div 1a/div 20 s/div v in = 5.0v i load = 0.2a to 0.8a v ldo = 3.3v
functional characteristics switching waveforms copyright ? 2006 marvell doc. no. mv-s101948-00 rev. d february 21, 2006, preliminary document classi fication: proprietary information page 29 4.3 switching waveforms note: for repeatability of measuring output ripple (v out(p-p) ), the test procedure is to set the scope bandwidth to 20mhz and uses a coax cable with very short leads terminated into 50 . the coax leads must be routed away from the switching node as much as possible. v buck pwm output ripple voltage 20mv/div 2 ms/div v in = 5.0v v buck = 1.2v i out = 2a v out(p-p) = 15.7 mv (note) _
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulato r module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00 rev. d copyright ? 2006 marvell page 30 document classification: proprietary information february 21, 2006, preliminary 4.4 efficiency 88mg830 efficiency vs . output current v in = 5.0v @ 25 c 88mg830 efficiency vs . output current v in = 3.3v @ 25 c 50 60 70 80 90 100 00.5 11.52 output current (a) efficiency (%) 3.3v 2.5v 1.8v 1.5v 1.2v 1.0v 0.8v 50 60 70 80 90 100 00.511.52 output current (a) efficiency (%) 2.5v 1.8v 1.5v 1.2v 1.0v 0.8v
functional characteristics considerations for bench testing and hot plug applications copyright ? 2006 marvell doc. no. mv-s101948-00 rev. d february 21, 2006, preliminary document classi fication: proprietary information page 31 4.5 considerations for bench testing and hot plug appli- cations these power modules have an absolute maximum input voltage rating of 6v. this means you must be careful when bench testing or with applications that require ?hot plugging? of vin to the system. hot plug applications are those that instantly apply voltage to a power module from a long cable. common examples of this are: bench top power supplies that supply power to the module through long banana plug cords and power obtained from ?wall wart? linear supplies. it turns out that long cables or wir es can act as ?transmission cables? and when the power is applied to the module input, the result is a reflected trans ient wave that can almost double the input voltage. this can have the consequence of destroying the power module because its maximum input voltage rating has been exceeded. this is not a power module ?problem?, bu t an application environment problem that can be over- come. 4.5.1 hot plug solution the input voltage ringing on a long power cord occurs becau se the cable sees an ac short-circuit at the input of the power module. this is because the input capacitor to the module is a ceramic capacitor with extremely low esr. to minimize or eliminate the amplitude of the ringing vo ltage it is necessary to add external capacitors in par- allel to the module input capacitors. however, these ca pacitors need to have noticeable esr ? which is what dampens the ringing. when bench testing or working on a ?hot plug? applic ation, marvell recommends the following practice: 4.5.2 hot plug protection for be nch testing and wall wart applica- tions ? add a 22uf ? 100uf tantalum capacitor located near t he input connector of your system. the measurable esr of the tantalum capacitor will help dissipate any potential ringing expected from the input line. the additional capacitance and use of capacitors with measurable esr results in keeping any voltage overshoot less than 6v.
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 32 document classification: proprietary information february 21, 2006, preliminary section 5. mechanical drawings 5.1 mechanical dimensions for 88mg815z & 88mg830z figure 8: 88mg815z & 88mg830z sip series mechanical dimensions (2.54) (2.54) (2.54) 1 3 2 (2.54) (2.54) (2.54) 4 5 6 7 0.047(1.19) max. pcb 8- ? 0.030(0.762) 8 0.025(0.64) top view side view
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 33 mechanical drawings mechanical dimensions for 88mg815z & 88mg830z figure 9: 88mg815z & 88mg830z dip series mechanical dimensions 7- ? 0.028(0.71) top view (3.23) (3.18) (3.18) (3.18) side view pin(7x) pcb
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 34 document classification: proprietary information february 21, 2006, preliminary figure 10: 88mg815z & 88mg830z smt series mech anical dimensions 7- ? 0.079(2.0) pad (3.18) (3.18) (3.23) top view 1 2 7 3 4 (3.18) 65 side view pcb 7-?0.079(2.0) ? 0.079(2.0) pad
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 35 mechanical drawings mechanical dimensions for 88mg816 & 88mg831 5.2 mechanical dimensions for 88mg816 & 88mg831 figure 11: 88mg816 & 88mg831 sip series mechanical dimensions 7- ? 0.030(0.762) top view (2.5 4) (2.5 4) (2.5 4) (2.5 4) (2.5 4) 2 1 3 4 5 6 7 side view 0.025(0.64) 0.047(1.19) max. pcb
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 36 document classification: proprietary information february 21, 2006, preliminary figure 12: 88mg816 & 88mg831 dip series mechanical dimensions 6- ? 0.028(0.71) (3.18) top view (3.23) 1 (3.23) 6 (3.18) 2 3 5 4 pin(6x) pcb side view
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 37 mechanical drawings mechanical dimensions for 88mg816 & 88mg831 figure 13: 88mg816 & 88mg831 smt series mech anical dimensions top view (3.23) 1 6 (3.18) 2 5 3 4 (3.23) (3.18) 6-?0.079(2.0) pad 6- ? 0.063(1.6) pad side view pcb
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 38 document classification: proprietary information february 21, 2006, preliminary section 6. ordering information 6.1 ordering part numbers and package markings figure 14 shows the ordering part numbering scheme for th e 88mg815z & 88mg830z devices. contact marvell? faes or sales representatives for complete ordering information. figure 14: 88mg815z & 88mg830z part number figure 15: 88mg816 & 88mg831 part number part number 88mg815 88mg830 package code s- sip d-dip t-smt 88mg815 z a0-x ldo output voltage options e.g., b = 3.3v e = 2.5v internal code part number 88mg816 88mg831 package code s- sip d-dip t-smt 88mg816 - a0 -x internal code
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 39 ordering information sample ordering part number 6.2 sample ordering part number the standard ordering part numbers for the respective solutions are as follows: table 9: ordering part numbers part number switcher output voltage ldo output voltage output current ambient temperature range 1 1. any specifications that pertains to the operating temperature range -40c to 85c are assured by design, characterization, and co rrelation with statisti cal process controls. package 88mg815b -s programmable 3.3v 1.0a -40 c to 85 c9-pin sip 88mg815e-s programmable 2.5v 1.0a -40 c to 85 c9-pin sip 88mg815b-d programmable 3.3v 1.0a -40 c to 85 c7-pin dip 88mg815e-d programmable 2.5v 1.0a -40 c to 85 c7-pin dip 88mg815b-t programmable 3.3v 1.0a -40 c to 85 c7-pin smt 88mg815e-t programmable 2.5v 1.0a -40 c to 85 c7-pin smt 88mg816-s programmable -- 1.0a -40 c to 85 c8-pin sip 88mg816-d programmable -- 1.0a -40 c to 85 c6-pin dip 88mg816-t programmable -- 1.0a -40 c to 85 c6-pin smt 88mg830b-s programmable 3.3v 2.0a -40 c to 85 c9-pin sip 88mg830e-s programmable 2.5v 2.0a -40 c to 85 c9-pin sip 88mg830b-d programmable 3.3v 2.0a -40 c to 85 c7-pin dip 88mg830e-d programmable 2.5v 2.0a -40 c to 85 c7-pin dip 88mG830B-T programmable 3.3v 2.0a -40 c to 85 c7-pin smt 88mg830e-t programmable 2.5v 2.0a -40 c to 85 c7-pin smt 88mg831-s programmable -- 2.0a -40 c to 85 c8-pin sip 88mg831-d programmable -- 2.0a -40 c to 85 c6-pin dip 88mg831-t programmable -- 2.0a -40 c to 85 c6-pin smt
88mg815/88mg816/88mg830/88mg831 non isolated, step-down switching regulator module with anyvoltage? technology. single and dual output voltage versions doc. no. mv-s101948-00, rev. d copyright ? 2006 marvell page 40 document classification: proprietary information february 21, 2006, preliminary 6.3 package marking 6.3.1 88mg815z package marking figure 16 is an example of the package marking for the 88mg815z part. markings for the other variants are simi- lar. figure 16: 88mg815z package marking g15 zy yww$ part number year, work week, assembly code y = last digit of year ww = work week $ = assembly code note : the above example is not drawn to scale. locations of markings are approximate. ldo output voltage options package options (s, d, or t)
copyright ? 2006 marvell doc. no. mv-s101948-00, rev. d february 21, 2006, preliminary document clas sification: proprietary information page 41 ordering information package marking table 10: marking specification table part number abbreviations 88mg815b-s g15bs 88mg815e-s g15es 88mg815b-d g15bd 88mg815e-d g15ed 88mg815b-t g15bt 88mg815e-t g15et 88mg816-s g16-s 88mg816-d g16-d 88mg816-t g16-t 88mg830b-s g30bs 88mg830e-s g30es 88mg830b-d g30bd 88mg830e-d g30ed 88mG830B-T g30bt 88mg830e-t g30et 88mg831-s g31-s 88mg831-d g31-d 88mg831-t g31-t
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