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1/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. system led drivers for mobile phones charge pump type for flash bd7700gu description bd7700gu is a maximum of 300ma led flash (three-channel tota l) driver ic. flash mode and torch mode are controllable by two external control signals. the flash mode timer ability for a maximum of 1s is carried, and management of flash lighting time is easy and safe. features 1) current regulation for led 2) 3ch high side current driver 3) flash led high side current driver (max 100ma@1ch) 4) torch led high side current driver (max 20ma@1ch) 5) indicate led high side current driver (max 1ma) 6) high efficiency up to 80% 7) 2port control flash and torch and indicate mode 8) charge pump step-up dc/dc converter (max 30 0ma) three charge pump mode (1, 1.5, 2.0) 9) automatically transition to each mode 10) over-voltage protection / in rush current prevention (soft start) / over current limiter 11) under voltage lockout threshold / thermal shutdown 12) small and thin csp package applications flash and torch of camera for mobile phone absolute maximum ratings (ta=25 ) parameter symbol ratings unit maximum applied voltage vmax 7 v input voltage vdin gnd-0.3 ~ vbat+0.3 v power dissipation pd 1062.5 (note1) mw operating temperature r ange topr -30 ~ +85 storage temperature range tstg -55 ~ +150 (note1) the measurement value, whic h was mounted on the pcb by rohm. temperature deleting : 8.5mw/ from ta>25 operating conditions (ta=-30 ~ 85 ) parameter symbol ratings unit battery power supply voltage vbat 2.7 - 5.5 v no.11041eat19
technical note 2/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu
technical note 3/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu
technical note 4/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu d c1n c2n c2p c1p c gnd cnt0 cnt1 vbat biset led3 vout a gnd vbat led2 led1 1234
technical note 5/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu
technical note 6/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu
technical note 7/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu ?torch? control ?torch? status turns ?high?, led current is occurred at 60ma(torch mode, 3 channel total), and ?torch? status turns ?low?, led current is off. ?torch? status is set by cnt0 pin = ?0? and cnt1 pin = ?1?. fig-6. torch control and led current ?indicate? control ?indicate? status turns ?high?, led2 current is occurred at ? ? ? ? ? ?
technical note 8/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu 3. charge pump mode transition the charge pump mode is automatically and optimally changed. (from x1 mode to x1.5 mode) (from x1.5 mode to x2.0 mode) power supply voltage goes down and this ic can?t keep constant led current, then the mode transition will start. (from x1.5 mode to x1 mode) (from x2.0 mode to x1.5 mode) power supply voltage goes up and the detecti on of vout and vbat is worked, then the mode transition will start. 4. over voltage and current protection this ic has vout over voltage and current protection for vout. even if led pins are open, vout vo ltage is kept below limit voltage. even if vout pin is short to gnd, current limiter works and restrains vbat current. 5. uvlo function this ic is shut down when vbat is under vuvlo voltage. this ic automatically return initial operation when vbat is up to vuvlo voltage, and ic will return to normal operation. 6. thermal shutdown function this ic has a thermal shut down function. it works above 175
technical note 9/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu ? led current vs led terminal voltage 3 3.5 4 4.5 5 5.5 6 0 100 200 led current [ma] max led voltage[v]
technical note 10/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu
technical note 11/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu (12) not connecting input terminals in terms of extremely high impedance of cmos gate, to open the input terminals causes unstable state. unstable state oc
technical note 12/12 www.rohm.com 2011.04 - rev. a ? 2011 rohm co., ltd. all rights reserved. bd7700gu (unit : mm) vcsp85h2 (bd7700gu) 2.240.1 1pin mark 2.240.1 1.0max 0.250.1 s 0.08 s 3 0.370.1 2 (0.15)index post 4 c 1 0.370.1 b a p=0.53 p=0.53 d 15- 0.3 0.05 a b ba 0.05 ? 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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