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1/15 www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. single-chip type with built-in fet switching regulators high-efficiency step-up switching regulator with built-in power mosfet bd8314nuv description rohm?s high-efficiency step-up switching regulator buil t-in power mosfet bd8314nuv generates step-up output including 8 v or 10 v from 4 batteries, batteries such as li 1cell or li2cell etc. or a 5 v fixed power supply line. this ic allows easy production of small and a wide range of output current, and is equipped with an external coil/capacitor downsized by high frequency operation of 1.2 mhz, built-i n 2.5 a rated 80 m ? nch fet sw, and flexible phase compensation sy stem on board. features 1) incorporates nch fet capabl e of withstanding 2.5 a/14 v. 2) incorporates phase compensation devi ce between input and output of error amp. 3) small coils and capacitors to be used by high frequency operation of 1.2 mhz 4) input voltage 3.0 v ~ 12 v 5) output current 600 ma (3.5 v ~ 10 v) at 10 v 600 ma (3.0 v ~ 8 v) at 8 v 6) incorporates soft-start function. 7) incorporates timer latch system short protecting function. 8) as small as 3 mm 3 mm, son 10-pin package vson010v3030 application general portable equipment like dsc/dvc powered by 4 dry batteries or li2cell absolute maximum ratings parameter symbol ratings unit maximum applied power voltage vcc, lx 14 v maximum input voltage swout, inv 14 v maximum input current iinmax 2.5 a power dissipation pd 700* mw operating temperature ran ge topr -25 to +85 c storage temperature range tstg -55 to +150 c junction temperature tjmax +150 c * when used at ta = 25c or more installed on a 74.2 74.2 1.6 t mm board, the rating is reduced by 5.6 mw/c. operating conditions (ta = 25c) parameter symbol ratings unit power supply voltage vcc 3.0 to 12 v output voltage vout 4.0 to 12 v no.11027edt09
technical note 2/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. ? ? ? ?
technical note 3/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved.
technical note 4/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. ? ? ?
technical note 5/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. ????R
technical note 6/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. fig.18. circuit current power supply property fig.15. lx max duty temperature property fig.17. circuit current temperature property fig.16. lx max duty power supply property 0 200 400 600 800 1000 02 46 8101214 vcc [v] icc [ua] 1.0 1.5 2.0 2.5 - 50 0 50 100 150 vcc [v] stb voltage [v] 75 80 85 90 95 -40 0 40 80 120 temparature [
technical note 7/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved.
technical note 8/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. ? ?
technical note 9/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. R
technical note 10/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. ?? ? ? ?? ??? ? ? ?? ??? ? ?? ?? ? ?? ??? ? ? ? ? ? ? ???
technical note 11/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. (4) dc/dc converter frequency response adjustment system condition for stable application the condition for feedback system stability under negative feedback is that the phase delay is 135 or less when gain is 1 (0 db). since dc/dc converter application is sampled according to the switching frequency, the bandwidth gbw of the whole system (frequency at which gain is 0 db) must be controlled to be equal to or lower than 1/10 of the switching frequency. in summary, the conditions necessary for the dc/dc converter are: - phase delay must be 135or lower when gain is 1 (0 db). - bandwidth gbw (frequency when gain is 0 db) must be equal to or lower than 1/10 of the switching frequency. to satisfy above two items, r 1 , r 2 , r 3 , d s and r s in fig. 34 should be set as follows. [1] r 1 , r 2 , r 3 bd8314nuv incorporates phase compensation devices of r4=62 k ? ???? ? ??? ???? ? ?? ? ? ? ? ? ? ? ? ? ? ? ?? ???? ? ?
technical note 12/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. [2]cs and rs setting in the step-up dc/dc converter, the secondary pole point is caused by the coil and capacitor as expressed by the following equation. ?? ? ? ???? ? ? ???? ?? ? ? ????
technical note 13/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved.
technical note 14/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved.
technical note 15/15 bd8314nuv www.rohm.com 2011.08 - rev.d ? 2011 rohm co., ltd. all rights reserved. (unit : mm) vson010v3030 s 3.00.1 3.00.1 1pin mark 1.0max (0.22) s 0.08 0.02 +0.03 - 0.02 610 51 0.40.1 0.5 0.5 2.00.1 1.20.1 0.25 +0.05 - 0.04 c0.25 ? order quantity needs to be multiple of the minimum quantity. embossed carrier tape tape quantity direction of feed the direction is the 1pin of product is at the upper left when you hold reel on the left hand and you pull out the tape on the right hand 3000pcs e2 () direction of feed reel 1pin
r1120 a www.rohm.com ? 2011 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 specied herein is subject to change for improvement without notice. the content specied 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 specications, 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 specied 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 specied herein is intended only to show the typical functions of and examples of application circuits for the produc ts. 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 specied in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, ofce-automation equipment, commu- nication devices, electronic appliances and amusement devices). the products specied 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, re or any other damage caused in the event of the failure of any product, such as derating, redundancy, re 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 specied 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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