ROHM BD82103GWL handbook
Contents
1. o gt X SO P DIEIDI P Q Pin ESD Type Tune Type B Tvpe C Type D ype ee ene ie VBAT d T VBAT I j j PAD j PAD T PAD j Ze i i GND j E T GND j GND l Fig 4 Pin ESD Type www rohm com 4 9 2011 06 Rev B 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note G Separate Function Description 1 LED driver Register access control protocol LED current is controlled by only EN terminal It is possible to access the register inside of this chip by using the protocol below LED driver ON OFF selecting the mode is operated by accessing the registers with using this protocol Ts i Sg oe S kK ME BENE I EN i 1 2 n1 n NX16 Fig 6 Slope control example Note n the case of N gt 16 BD82103GWL selects the mode of N 16 LED current is changed by the pulse of EN pin Be careful to noise of EN signal Reset BD82103GWL when the set is unusual Keep EN L over Toff time LED current level The interface records rising edges of the EN pin and decodes them into 16 different indicated in following table Output current Output current mA mA www rohm com 5 9 2011 06 Rev B 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note 2 Charge pump a Description of operations Pin voltage comparison takes place at Vout control secti2. EN High threshold voltage VIH 1 4 V EN High level Input current IIH 0 1 UA EN Vin Low level Input current IL 1 0 UA EN 0V Minimum EN High time THI 0 05 100 usec Described in Fig 5 Minimum EN Low time TLO 0 3 100 usec Described in Fig 5 EN Off Timeout TOFF 1 msec Described in Fig 5 Latch time TLAT 1 msec Described in Fig 5 Access available time Tacc 1 msec Described in Fig 5 www rohm com 2011 ROHM Co Ltd All rights reserved 2 9 2011 06 Rev B BD82103GWL Technical Note G Block Diagram zo amp amp oO O OO x1 x1 5 x2 Charge pump Over Voltage Protect Charge Pump better Gees Enable Vout Control Brightness Control LED3 DET Current GND Pin number 11pin Fig 1 Block Diagram www rohm com 3 9 2011 06 Rev B 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note LED2 EN AUN Q Pin Configuration Bottom View LED3 VOUT Fig 2 Pin Configuration Q Pin Descriptions Terminal No Pin name Power supply In Out In Out In Out In Out gt Flying capacitor pin positive side Flying capacitor pin negative side Flying capacitor pin positive side Flying capacitor pin negative side Charge pump output ON OFF and dimming control LED current driver output 1 O COIN 001 roi gt LED current driver output 2 O LED current driver output 3 GND
3. power supply or the ground pin the ICs can break down Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them Input pins In terms of the construction of IC parasitic elements are inevitably formed in relation to potential The operation of the parasitic element can cause interference with circuit operation thus resulting in a malfunction and then breakdown of the input pin Therefore pay thorough attention not to handle the input pins such as to apply to the input pins a voltage lower than the ground respectively so that any parasitic element will operate Furthermore do not apply a voltage to the input pins when no power supply voltage is applied to the IC In addition even if the power supply voltage is applied apply to the input pins a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics External capacitor In order to use a ceramic capacitor as the external capacitor determine the constant with consideration given to a degradation in the nominal capacitance due to DC bias and changes in the capacitance due to temperature etc Thermal shutdown circuit TSD This IC builds in a thermal shutdown TSD circuit When junction temperatures become detection temperature or higher the thermal shutdown circuit operates and turns a switch OFF The thermal shutdown circuit which is aimed at isolating the IC from thermal runa
4. ROHM Technical Note SEMICONDUCTOR LED Drivers for LCD Backlights Backlight LED Driver ree RoHS for Small LCD Panels Charge Pump Type BD82103GWL No 11040EBT34 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 G Features 1 2light or 3light parallel LED driver is mounted 2 16 step LED current adjust function 3 Inter LED relative current accuracy 5 or less 4 Driving control via a single line digital control interface 5 Automatic transition charge pump type DC DC converter x1 x1 5 x2 6 High efficiency achieved Maximum over 9396 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 MAX Pin pitch 0 4mm CSP11pin package QG Absolute Maximum Ratings Ta 25 C Parameter Symbol Ratings Unit Power supply voltage VMAX T V Input voltage EN Vdin GND 0 3 VBAT 0 3 V Power dissipation Pd 730 mW Operating temperature range Topr 30 85 C Storage temperatu
5. ard 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 a
6. d consideration should be given to take physical safety measures including the use of fuses etc Power supply and ground line Design PCB pattern to provide low impedance for the wiring between the power supply and the ground lines Pay attention to the interference by common impedance of layout pattern when there are plural power supplies and ground lines Especially when there are ground pattern for small signal and ground pattern for large current included the external circuits please separate each ground pattern Furthermore for all power supply pins to ICs mount a capacitor between the power supply and the ground pin At the same time in order to use a capacitor thoroughly check to be sure the characteristics of the capacitor to be used present no problem including the occurrence of capacity dropout at a low temperature thus determining the constant Ground voltage Make setting of the potential of the ground pin so that it will be maintained at the minimum in any operating state Furthermore check to be sure no pins are at a potential lower than the ground voltage including an actual electric transient 4 Short circuit between pins and erroneous mounting 12 13 www rohm com In order to mount ICs on a set PCB pay thorough attention to the direction and offset of the ICs Erroneous mounting can break down the ICs Furthermore if a short circuit occurs due to foreign matters entering between pins or between the pin and the
7. ny 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 Thank you for your accessing to ROHM product informations More detail product informations and catalogs are available please contact us Bola iLL ROHM Customer Support System SEMICONDUCTOR http www rohm com contact www rohm com 2011 ROHM Co Ltd All rights reserved R1120A
8. on and then Vout generation takes place so that the LED cathode voltage with the highest Vf is set to 0 2V A boost rate is changed automatically to a proper one at the Charge Pump Mode Control section so that operation 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 EN LED l Soft Start l Ordinal mode Fig 7 Soft Start c Automatic boost rate change The boost rate automatically switches to the best mode x1 mode gt x1 5 mode or x1 5 mode gt x2 mode If a battery voltage drop occurs BD82103GWL cannot maintain the LED constant current and then mode transition begins x1 5 mode gt x1 mode or x2 mode gt x1 5 mode If a battery voltage rise occurs VOUT and VBAT detection are activated and then mode transition begins 3 UVLO Under Voltage Lock Out If the input voltage falls below 2 2V BD82103GWL is shut down to prevent malfunction due to ultra low voltage 4 OVP Over Voltage Protection This circuit protects this IC against damage when the C P output voltage VOUT rises extremely for some external factors b Thermal shutdown TSD To protect this IC against thermal damage or heat driven uncontrolled operations this circuit turns off the output if the chip temperature rises over 175 C In addition it turns on the out
9. put if the temperature returns to the normal temperature Because the built in thermal protection circuit is intended to protect the IC itself the thermal shutdown detection temperature must be set to below 175 C in thermal design O Power sequence EN signal must be released after VBAT voltage enough rise up Prohibit the VBAT rise up during EN H Fig 8 Power sequence www rohm com 6 9 2011 06 RevB 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note OG Application Circuit Example 3 light Battery VBATL x1 x1 5 x2 VOUT Cin Charge pump AuF Cout 1uF Over uou uou polit S polit Control n Pulse Generator Enable Vout Control Brightness LED 7 Control d e LED3 DET O _ K Current GND Charge pump Cout 1uF Over uod uod F dim F Control n Pulse Generator Enable Vout Control Brightness Ter Control Eg d leg O Ki EE 2 LED3 DET Current GND Fig 10 Application Circuit Example 2 www rohm com 7 9 2011 06 Rev B 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note G Notes for use 1 Absolute Maximum Ratings An excess in the absolute maximum ratings such as supply voltage temperature range of operating conditions etc can break down devices thus making impossible to identify breaking mode such as a short circuit or an open circuit If any special mode exceeding the absolute maximum ratings is assume
10. re range Tstg 55 150 C Note 1 The measurement value which was mounted on the PCB by ROHM When a glass epoxy substrate 70mm x 70mm x 1 6mm has been mounted this loss will decrease 5 84mW C if Ta is higher than or equal to 25 C G Operating Conditions Ta 30 85 C Parameter Symbol Ratings Unit Operating power supply voltage VBAT 24 755 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 www rohm com 4 9 2011 06 RevB 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note G Electrical Characteristics Unless otherwise noted Ta 25 C VBAT 3 6V Limits Parameter Typ Current Consumption Quiescent Current Iq 0 1 1 UA EN 0V Current Consumption 1 EEN 1 0 2 4 mA x1 0 Mode Except LED current Current Consumption2 ldd2 2 0 9 5 mA x2 0 Mode Except LED current Charge Pump Oscillator frequency fosc 0 56 0 85 1 14 MHz Current Source LED maximum current ILED max 18 20 22 mA VBAT23 0V LED current accuracy ILED diff 10 0 nce ge tage 1 0V LED current matching ILED match 0 5 5 0 need fp ei lace 10V LED control voltage VLED 045 025 V EE Se Logic control terminal Low threshold voltage VIL 0 4 V
11. v B 2011 ROHM Co Ltd All rights reserved BD82103GWL Technical Note Ordering part number ll esperti RC T Part No Part No Package Packaging and forming specification GWL UCSP50L 1 E2 Embossed tape and reel UCSP50L1 BD82103GWL Tape and Reel information Embossed carrier tape 3000pcs E2 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 1PIN MARK Direction of feed 11 00 2 0 05 0 05 A B 0 35 0 05 0 15 INDEX POS Direction of feed pin Order quantity needs to be multiple of the minimum quantity www rohm com 9 9 2011 06 Rev B 2011 ROHM Co Ltd All rights reserved Notice 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 stand
12. way as much as possible is not aimed at the protection or guarantee of the IC Therefore do not continuously use the IC with this circuit operating or use the IC assuming its operation Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation Pd in actual states of use LDO Use each output of LDO by the independence Don t use under the condition that each output is short circuited because it has the possibility that an operation becomes unstable About the pin for the test the un use pin Prevent a problem from being in the pin for the test and the un use pin under the state of actual use Please refer to a function manual and an application notebook And as for the pin that doesn t specially have an explanation ask our company person in charge About the rush current For ICs with more than one power supply it is possible that rush current may flow instantaneously due to the internal powering sequence and delays Therefore give special consideration to power coupling capacitance power wiring width of ground wiring and routing of wiring About the function description or application note or more The function description and the application notebook are the design materials to design a set So the contents of the materials aren t always guaranteed Please design application by having fully examination and evaluation include the external elements 8 9 2011 06 Re
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ROHM BD82103GWL handbook