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| 1/15 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regulator series low noise high efficiency step-down switching regulator with built-in power mosfet BD8960NV description rohm?s high efficiency step-down switching regulator bd89 60nv is a power supply designed to produce a low voltage including 1 volts from 5.5/3.3 volts power supply line. offers high efficiency with synchronous rectifier. employs a current mode control system to provide faster tr ansient response to sudden change in load. features 1) offers fast transient response with current mode pwm control system. 2) offers highly efficiency for all load range with synchronous rectifier (nch/pch fet) 3) incorporates soft-start function. 4) incorporates thermal protection and ulvo functions. 5) incorporates short-current protec tion circuit with time delay function. 6) incorporates shutdown function 7) employs small surface mount package : son008v5060 use power supply for lsi including dsp, micro computer and asic line up parameter symbol limits unit v cc voltage v cc -0.3 +7 1 v pv cc voltage pv cc -0.3 +7 1 v en voltage v en -0.3 +7 v sw,ith voltage v sw ,v ith -0.3 +7 v power dissipation 1 pd1 900 2 mw power dissipation 2 pd2 3900 3 mw operating temperature range topr -25 +105 storage temperature range tstg -55 +150 maximum junction temperature tjmax +150 1 pd should not be exceeded. 2 derating in done 7.2mw/ for temperatures above ta=25 , mounted on 70mm70mm1.6mm glass epoxy pcb. 3 derating in done 31.2mw/ for temperatures above ta=25 , mounted on jesd51-7. operating conditions (ta=25 ) parameter symbol limits unit min. typ. max. v cc voltage v cc * 4 2.7 * 5 3.3 5.5 v pv cc voltage p vcc * 4 2.7 * 5 3.3 5.5 v en voltage v en 0 - vcc v sw average output current isw * 4 - - 2.0 a output voltage setting range v out 1.0 - 2.5 v 4 pd should not be exceeded. 5 in case set output voltage 1.6v or more, vccmin. = vout + 1.3v. no.09027eat21
technical note BD8960NV 2/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? ? ? ? lot no. d8960 technical note BD8960NV 3/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. technical note BD8960NV 4/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. technical note BD8960NV 5/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? ? ? technical note BD8960NV 6/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? technical note BD8960NV 7/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? ? ? ? technical note BD8960NV 8/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ? ? ? ? ? ? ? technical note BD8960NV 9/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ??? ??? ??? ??? ??? technical note BD8960NV 10/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. 4. determination of rith, cith that works as a phase compensator as the current mode control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due to a cr filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its esr. so, the phases are easily compensated by adding a zero to the power amplifier output with c and r as described bel ow to cancel a pole at the power amplifier. stable feedback loop may be achieved by canceling the pole fp (mi n.) produced by the output ca pacitor and the load resistance with cr zero correction by the error amplifier. fig.28 open loop gain characteristics fig.29 error amp phase compensation characteristics fp= 2 technical note BD8960NV 11/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. 5. determination of output voltage the output voltage v out is determined by the equation (6): v out =(r2/r1+1)v adj ??? (6) v adj : voltage at adj terminal (0.8v typ.) with r1 and r2 adjusted, the output vo ltage may be determined as required. adjustable output voltage range : 1.0v 2.5v fig.31 determination of output voltage use 1 k ? 100 k ? resistor for r1. if a resistor of the resistance higher than 100 k ? is used, check the assembled set carefully for ripple voltage etc. BD8960NV cautions on pc board layout fig.33 layout diagram for the sections drawn with heavy line, use th ick conductor pattern as short as possible. lay out the input ceramic capacitor cin closer to the pi ns pvcc and pgnd, and the output capacitor co closer to the pin pgnd. lay out cith and rith between the pi ns ith and gnd as neat as possible with least necessary wiring. * son008v5060 (BD8960NV) has thermal fi n on the reverse of the package. the package thermal performance may be enhanced by bonding th e fin to gnd plane which take a large area of pcb. a dj v cc ith gnd en pv cc sw pgnd v cc r ith gnd c o c in v out en l c ith 1 2 3 4 8 7 6 5 r 2 r 1 sw 6 1 a dj l co r2 r1 output vo=2.5v vo=2.0v vo=1.8v fig.32 minimum input voltage in each output voltage the lower limit of input voltag e depends on the output voltage. basically, it is recommended to use in the condition : v ccmin = v out +1.3v. fig.32. shows the necessary out put current value at the lower limit of input voltage. (dcr of inductor : 0.1 ? ) this data is the characteristic va lue, so it? doesn?t guarantee the operation range, 2.7 2.9 3.1 3.3 3.5 3.7 3.9 00 . 511 . 52 output current : iout[a] input voltage : vcc[v] technical note BD8960NV 12/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. recommended components lists on above application symbol part value manufacturer series l coil 2.2h tdk ltf5022-2r2n3r2 c in ceramic capacitor 22f kyocera cm32x5r226m10a c o ceramic capacitor 22f kyocera cm316b226m06a c ith ceramic capacitor v out =1.0v 680pf rohm mch18 serise v out =1.2v 560pf rohm mch18 serise v out =1.5v 470pf rohm mch18 serise v out =1.8v 330pf rohm mch18 serise v out =2.5v 330pf rohm mch18 serise r ith resistance v out =1.0v 10k ? rohm mcr03 serise v out =1.2v 12k ? rohm mcr03 serise v out =1.5v 15k ? rohm mcr03 serise v out =1.8v 18k ? rohm mcr03 serise v out =2.5v 18k ? rohm mcr03 serise * the parts list presented above is an example of recommended pa rts. although the parts are sound, actual circuit characteristi cs should be checked on your application carefully before use. be sure to allow suff icient margins to accommodate variations between external device s and this ic when employing the depicted circuit with other circuit constants modi fied. both static and transien t characteristics should be consi dered in establishing these margins. when switching noise is substantial and may impact the system, a low pa ss filter should be inserted between the vcc an d pvcc pins, and a schottky barrier diode established between the sw and pgnd pins. i/o equivalence circuit fig.34 i/o equivalence circuit en ? en pin ? sw pin pv cc sw pv cc pv cc ith ? ith pin v cc ? adj pin a dj technical note BD8960NV 13/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. notes of use 1. absolute ma ximum ratings while utmost care is taken to quality control of this pr oduct, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operati ng temperature range may result in breakage. if broken, short-mode or open-mode may not be identified. so if it is expected to encounter with special mode that may exceed the absolute maximum ratings, it is requested to take necessary sa fety measures physically including insertion of fuses. 2. electrical potential at gnd gnd must be designed to have the lowest elec trical potential in any operating conditions. 3. short-circuiting between terminals, and mismounting when mounting to pc board, care must be taken to avoid mistak e in its orientation and alignment. failure to do so may result in ic breakdown. short-circuiting due to foreign matters entered between output te rminals, or between output and power supply or gnd may also cause breakdown. 4.operation in strong electromagnetic field be noted that using the ic in the strong electr omagnetic radiation can cause operation failures. 5. thermal shutdown protection circuit thermal shutdown protection circuit is the circuit designed to isolate the ic from thermal runaway, and not intended to protect and guarantee the ic. so, the ic the thermal shutdown protection circui t of which is once activated should not be used thereafter for any operation originally intended. 6. inspection with the ic set to a pc board if a capacitor must be connected to the pin of lower impedanc e during inspection with the ic set to a pc board, the capacitor must be discharged after each process to avoid stre ss to the ic. for electrostatic protection, provide proper grounding to assembling processes with special care taken in handling and storage. when connecting to jigs in the inspection process, be sure to turn off the power supply before it is connected and removed. 7. input to ic terminals this is a monolithic ic with p + isolation between p-substrate and each element as illustrated below. this p-layer and the n-layer of each element form a p-n junction, and various parasitic element are formed. if a resistor is joined to a transistor terminal as shown in fig 35. p-n junction works as a parasitic diode if t he following relationship is satisfied; gnd>terminal a (at resistor side), or gnd>terminal b (at transistor side); and if gnd>terminal b (at npn transistor side), a parasitic npn transistor is activated by n-layer of ot her element adjacent to the above-mentioned parasitic diode. the structure of the ic inevitably forms parasitic elements, th e activation of which may cause interference among circuits, and /or malfunctions contributing to breakdown. it is therefore requested to take care not to use the device in such manner that the v oltage lower than gnd (at p-substrate) may be appli ed to the input terminal, which may result in activation of parasitic elements. fig.35 simplified structure of monorisic ic 8. ground wiring pattern if small-signal gnd and large-current gnd are provided, it will be recommended to separate the large-current gnd pattern from the small-signal gnd pattern and establish a si ngle ground at the reference poi nt of the set pcb so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal gnd. pay attention not to cause fluctuations in the gnd wiring pattern of external parts as well. 9 . selection of inductor it is recommended to use an inductor with a series resistance element (dcr) 0.1 ? or less. especially, in case output voltage is set 1.6v or more, note that use of a high dcr i nductor will cause an inductor loss , resulting in decreased output voltage. should this condition continue for a specified peri od (soft start time + timer la tch time), output short circuit protection will be activated and output will be latched off. when using an inductor over 0.1 ? , be careful to ensure adequate margins for variation between external devices and this ic, including transient as well as static characteristics. furthermore, in any case, it is recommended to start up the out put with en after supply voltage is within operation range. resistor transistor (npn) n n n p + p + p p substrate gnd parasitic element pin a n n p + p + p p substrate gnd parasitic element pin b c b e n gnd pin a p aras iti c element pin b other adjacent elements e b c gnd p aras iti c element technical note BD8960NV 14/14 www.rohm.com 2009.05 - rev.a ? 2009 rohm co., ltd. all rights reserved. ordering part number b d 8 9 6 0 n v - e 2 part no. part no. package nv : son008v5060 packaging and forming specification e2: embossed tape and reel (unit : mm) son008v5060 0.08 s s 765 4321 8 (0.22) c0.25 1pin mark +0.03 - 0.02 0.02 0.59 0.4 +0.05 - 0.04 5.0 0.15 6.0 0.15 4.2 0.1 3.6 0.1 0.8 0.1 1.0max 1.27 ? order quantity needs to be multiple of the minimum quantity. r0039 a www.rohm.com ? 2009 rohm co., ltd. all rights reserved. notice rohm customer support system http://www.rohm.com/contact/ thank you for your accessing to rohm product informations. more detail product informations and catalogs are available, please contact us. notes no copying or reproduction of this document, in part or in whole, is permitted without the consent of rohm co.,ltd. the content specified herein is subject to change for improvement without notice. the content specified herein is for the purpose of introducing rohm's products (hereinafter "products"). if you wish to use any such product, please be sure to refer to the specifications, which can be obtained from rohm upon request. examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the products. the peripheral conditions must be taken into account when designing circuits for mass production. great care was taken in ensuring the accuracy of the information specified in this document. however, should you incur any damage arising from any inaccuracy or misprint of such information, rohm shall bear no responsibility for such damage. the technical information specified herein is intended only to show the typical functions of and examples of application circuits for the products. rohm does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by rohm and other parties. rohm shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. the products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specified in this document are not designed to be radiation tolerant. while rohm always makes efforts to enhance the quality and reliability of its products, a product may fail or malfunction for a variety of reasons. please be sure to implement in your equipment using the products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any product, such as derating, redundancy, fire control and fail-safe designs. rohm shall bear no responsibility whatsoever for your use of any product outside of the prescribed scope or not in accordance with the instruction manual. the products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller or other safety device). rohm shall bear no responsibility in any way for use of any of the products for the above special purposes. if a product is intended to be used for any such special purpose, please contact a rohm sales representative before purchasing. if you intend to export or ship overseas any product or technology specified herein that may be controlled under the foreign exchange and the foreign trade law, you will be required to obtain a license or permit under the law. |
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