1/9 www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. led drivers for lcd backlights backlight led driver for small lcd panels (charge pump type) BD82103GWL description BD82103GWL is charge pump type 2 light or 3 light parallel led driver for the portable instruments. this ic not only ensures efficient boost by automatically changing the boost rate but also works as a constant current driver in 16 steps, so that the driving current can be adjusted finely. this ic is best suited to turn on white leds that require high-accuracy led brightness control. features 1) 2light or 3light parallel led driver is mounted 2) 16-step led current adjust function 3) inter-led relative curre nt accuracy: 5% or less 4) driving control via a single- line digital control interface 5) automatic transition charge pump type dc/dc converter (1,1.5, x2) 6) high efficiency achieved (maximum over 93%) 7) it transits for the most suitable power operating by the led terminal process of the 3rd light when 2 light driving 8) various protection functions such as output voltage protection and thermal shutdown circuit are mounted. 9) package : ucsp50l1 (thick 0.55mm ma x, pin pitch 0.4mm) csp11pin package absolute maximum ratings (ta=25 ) parameter symbol ratings unit power supply voltage vmax 7 v input voltage ( en ) vdin gnd-0.3 ~ vbat+0.3 v power dissipation pd 730 mw operating temperature range topr -30 ~ +85 storage temperature range tstg -55 ~ +150 note 1) the measurement value whic h was mounted on the pcb by rohm. when a glass epoxy substrate ( 70mm 70mm 1.6mm) has been mount ed, this loss will decrease 5.84mw/ if ta is higher than or equal to 25 . operating conditions (ta = -30 ~ 85 ) parameter symbol ratings unit operating power supply voltage vbat 2.7 ~ 5.5 v *this chip is not designed to protect itself against radioactive rays. *this material may be changed on its way to designing. *this material is not the official specification. no.11040ebt34
technical note 2/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved.
technical note 3/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 1, 1.5, 2 charge pump
technical note 4/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. c led1 gnd vbat c1n b led2 index en c1p a led3 vout c2n c2p 1234
technical note 5/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. ? Q ? ? ? ?
technical note 6/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. (2) charge pump a) description of operations pin voltage comparison takes place at vout control sect ion, and then vout generation ta kes place so that the led cathode voltage with the highest vf is set to 0.2v. a boost ra te is changed automatically to a proper one at the charge pump mode control section so that oper ation can take place at possible low boost rate. in addition, if the output voltage falls below 1.5v, this ic is reset for short-circuit at output. b) soft start function BD82103GWL have a soft start function that prevents the rush current. soft start ordinal mode en/led* vout i led t off fig.7 soft start c) automatic boost rate change the boost rate automatically switches to the best mode. * (1 mode ? ? ? ?
technical note 7/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. 4 pulse generator led3 det 1, 1.5, 2 charge pump over voltage protect osc tsd enable/ brightness control vout control charge pump mode control current dac gnd led1 led2 en battery vbat vout c1n c1p c2n c2p c1 c2 cin =1 4 pulse generator led3 det led3
technical note 8/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved.
technical note 9/9 BD82103GWL www.rohm.com 2011.06 - rev.b ? 2011 rohm co., ltd. all rights reserved. (unit : mm) ucsp50l1 (BD82103GWL) a b ba 0.05 2 1.80.05 11- 0.20.05 p=0.43 3 c 1 1pin mark 0.350.05 b 0.30.05 4 a ( 0.15)index post 0.08 s s 0.55max 0.10.05 p=0.42 1.50.05 ? 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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