ROHM BD7700GU handbook
Contents
1. Flash term is maximum 1s by internal timer om _ Po ILED OMA Fig 4 FLASH control and LED Current CNT1 CNTO i WR 1s i 300mA ILED OmA Fig 5 FLASH control and LED Current with Timer Limit www rohm com 6 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note 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 CNTO pin 0 and CNT1 pin 1 CNT1 CNTO Fig 6 TORCH control and LED Current Indicate control Indicate status turns High LED2 Current is occurred at 1 mA LED1 and LED3 Current is occurred at OmA Indicate status turns Low LED Current is OFF Indicate status is set by CNTO pin 1 and CNT1 pin 0 CNT1 i CNTO Fig 7 Indicate LED control and Indicate LED Current 2 LED Current control by Rset The setting of Rset controls LED current and following equation shows the LED current 1ch ILED 1200 Rset Flash ILED 240 Rset Torch ILED 12 Rset Indicate Then follows Table shows the LED current 1ch for some Rset settings Typical Rset 120kQ 62kQ 30kQ 20kQ 15kO 12kQ ILED FLASH 10mA 20mA 40mA 60mA 80mA 100mA ILED TORCH 2mA 4mA 8mA 12mA 16mA 20mA ILED Indicate 0 1mA 0 2mA 0 42. 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 assumed consideration should be given to take physical safety measures including the use of fuses etc Operating conditions These conditions represent a range within which characteristics can be provided approximately as expected The electrical characteristics are guaranteed under the conditions of each parameter Reverse connection of power supply connector The reverse connection of power supply connector can break down ICs Take protective measures against the breakdown due to the reverse connection such as mounting an external diode between the power supply and the IC s power supply terminal Power supply line Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines In this regard for the digital block power supply and the analog block power supply even though these power supplies has the same level of potential separate the power supply pattern for the digital block from that for the analog block thus suppressing the diffraction of digital noises to the analog block power supply resulting from impedance common to the wiring patterns For the GND line give consideration to design the patterns in a similar manner Furthermore for all power supply terminals to ICs mount a capacitor between the power supply and the GND t
3. 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 ot
4. 7700GU Ordering part number VCSP85H2 BD7700GU 1PIN MARK Package GU VCSP85H2 Technical Note Packaging and forming specification E2 Embossed tape and reel lt Tape and Reel information gt Embossed carrier tape O Tape Quantity 3000pcs Direction of feed 2 24 0 1 0 25 0 1 EZ 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 15 00 3 0 05 Le 0 05 JAIB S 00 15 INDEX POST O O O O OO O 0 3740 1 Unit mm www rohm com 2011 ROHM Co Ltd All rights reserved 12 12 Direction of feed or 1pin Order quantity needs to be multiple of the minimum quantity 2011 04 Rev A 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
5. ROHIM SEMICONDUCTOR System LED Drivers for Mobile Phones Charge Pump type for Flash BD7700GU Description ROHM Electronic Components Technical Note No 11041EAT19 BD7700GU is a maximum of 300mA LED flash three channel total 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 300mA Three charge pump mode x1 x1 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 C 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 range Topr 30 85 C Storage temp
6. ection Vovp 5 5 V VOUT Limit Under voltage lock out Vuvlo 1 8 2 0 2 2 V UVLO Detect Voltage Start up time Tstart 3 ms Stand by Torch Flash Indicate 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note Package Outline IPIN MARK E 3 ME 2 24 0 O 25 0 DE Lids CH 0 08 GG I S5S 40 3 0 05 fe 0 05 JAIB 0 15 INDEX POST UNIT mm Drawing No EX901 5013 Fig 1 Package outline NE ai 3 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note Block Diagram C1 C2 CIN C1P C2NL C2P C C CHPREG CHP_TOP CNTO VOUTDET LEDDRVTOP DIGTOP IT OSC ERv r EDI m LED2 Indicate out CNT1 LEDDRV LED3 j LEDDRV PAPAN HREF DP e Zei ZIT ISET ISETDRV C1 C2 CIN 2 2uF COUT 4 7uF Fig 2 Block Diagram Pin Location Bottom View CNTO CNT1 Ka VBAT LED2 LED Gs 3 Pin SCH www rohm com 4 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note Terminals In ESD Diode h No PinName Out Type Functions for Power for GND C4 VBAT A GND Ba
7. erature range Tstg 55 150 C Note1 The measurement value which was mounted on the PCB by ROHM Temperature deleting 8 5mW C from Ta gt 25 C Operating conditions Ta 30 85 C Parameter Symbol Ratings Unit Battery Power Supply voltage VBAT 2 7 5 5 V www rohm com 4 12 2011 ROHM Co Ltd All rights reserved 2011 04 Rev A Directive Compliance BD7700GU Technical Note Electrical Characteristics Unless otherwise noted Ta 25 C VBAT 3 6V Parameter Symbol ae Units Condition Min Typ Max Logic control terminal Low threshold voltage VthL2 0 4 V CNTO and CNT1 port High threshold voltage VthH2 1 2 V CNTO and CNT1 port High level Input current linH2 18 3 33 HA CNTO or CNT1 5 5V Low level Input current linL2 1 0 yA CNTO or CNT1 OV DC DC Converter Quiescent Current Iq 0 1 1 0 MA CNTO and CNT1 0 Flash Current Accuracy Iflash 15 0 15 100mA Torch Current Accuracy Itorch 15 0 15 20mA Indicate Current Accuracy lind 30 0 30 1mA LED2 Terminal Current Consumption 1 Iddi 1 0 2 0 mA X1 0 mode LED current OmA Current Consumption 2 Idd2 6 0 9 0 mA X1 5 mode LED current OmA Current Consumption 3 Idd3 9 0 12 0 mA X2 0 mode LED current OmA ISET Voltage Viset 0 5 0 6 0 7 V Switching frequency Fsw 1 0 1 25 1 5 MHz Sat Voltage Vsat 150 250 350 mV VOUT LED Voltage VLED 3V Over voltage prot
8. erminal At the same time in order to use an electrolytic 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 GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state Furthermore check to be sure no terminals are at a potential lower than the GND voltage including an actual electric transient Short circuit between terminals and erroneous mounting 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 terminals or between the terminal and the power supply or the GND terminal the ICs can break down Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them Inspection with set PCB On the inspection with the set PCB if a capacitor is connected to a low impedance IC terminal the IC can suffer stress Therefore be sure to discharge from the set PCB by each process Furthermore in order to mount or dismount the set PCB to from the jig for the inspection process be sure to turn OFF the power supply and then mount the set PCB to the jig After the completion of the inspection be sure to turn OFF t
9. he power supply and then dismount it from the jig In addition for protection against static electricity establish a ground for the assembly process and pay thorough attention to the transportation and the storage of the set PCB Input terminals 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 terminal Therefore pay thorough attention not to handle the input terminals such as to apply to the input terminals a voltage lower than the GND respectively so that any parasitic element will operate Furthermore do not apply a voltage to the input terminals when no power supply voltage is applied to the IC In addition even if the power supply voltage is applied apply to the input terminals a voltage lower than the power supply voltage or within the guaranteed value of electrical characteristics 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 single ground at the reference point 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 tocause fluctuations in the GND wiring pattern of e
10. her 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 Thank you for your accessing to ROHM product informations More detail product informations and catalogs are available please contact us ROHM ROHM Customer Support System SEMICONDUCTOR http www rohm com contact www rohm com 2011 ROHM Co Ltd All rights reserved R1120A
11. ion of external parts Recommended external parts are as shown below When to use other parts than these select the following equivalent parts Capacitor Si a Temp Rated Value Manufacturer Product number Vertical Horizontal i Height Chara Voltage size size CIN 2 2uF MURATA GRM155B30J225ME 1 0 0 5 0 5 B 6 3V COUT 4 7uF MURATA GRM188B31A475KE15D 1 6 0 8 0 8 B 10V C1 C2 2 2UF MURATA GRM155B30J225ME 1 0 0 5 0 5 B 6 3V LED specification This IC targets to drive high power LED Available VF Forward voltage range of LED is as follows Typ Max VF 3 4V 5V at 100mA 1ch Ta 25 C Note LED VF range has Temperature characteristics It is necessary tochoice suitable LED characteristics at LED Current setting Available LED terminal Voltage range is changed by LED current LED Current vs LED Terminal Voltage D in on Ku D Max LED Voltage V A o gt a 0 100 200 LED Current mA Ron x2 0 1 76Q Ee ai 9 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note Notes for use 1 2 3 4 5 6 7 8 9 10 11 www rohm com 2011 ROHM Co Ltd All rights reserved Absolute Maximum Ratings An excess in the absolute maximum ratings such as supply voltage temperature range of operating conditions etc can
12. mA 0 6mA 0 8mA 1mA Ratio of Flash and Torch current deviates from 5 1 by RSET value in light load of LED current www rohm com 7 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note 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 detection 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 voltage 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 C and under the situation IC will change the status from active to inactive To become under 175 C IC will return to normal operation ATONE COM 8 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD7700GU Technical Note Select
13. ttery power supply pin A2 VBAT A GND Battery power supply pin C2 CNTO In G VBAT GND LED control input 1 On 0 Off C3 CNT1 In G VBAT GND LED control input 1 On 0 Off B4 VOUT Out A GND Output Voltage A4 LED1 Out D GND Current drive out for Torch Flash A3 LED2 Out D GND Current drive out for Torch Flash Indicate B3 LED3 Out D GND Current drive out for Torch Flash B1 ISET In B VBAT GND Resistor connection for LED current setting D4 C1P In Out B VBAT GND Positive terminal of transfer capacitor 1 D1 C1N In Out A GND Negative terminal of transfer capacitor 1 D3 C2P In Out B VBAT GND Positive terminal of transfer capacitor 2 D2 C2N In Out A GND Negative terminal of transfer capacitor 2 C1 GND F VBAT Ground pin A1 GND F VBAT Ground pin Total 15 Pin www rohm com 2011 ROHM Co Ltd All rights reserved 5 12 2011 04 Rev A BD7700GU Technical Note Functional Description 1 FLASH and TORCH and Indicate pin control FLASH and TORCH select FLASH and TORCH is selected by CNTO and CNT1 pin Status is as bellows CNT1 CNTO Status 0 0 All LED OFF 0 1 Indicate 1 0 TORCH 1 1 FLASH FLASH control FLASH status turns High Flash LED Current is occurred and FLASH status turns Low Flash LED Current is OFF FLASH status is set by CNTO pin 1 and CNT1 pin 1
14. xternal parts as well 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 10 12 2011 04 Rev A BD7700GU Technical Note 12 Not connecting input terminals In terms of extremely high impedance of CMOS gate to open the input terminals causes unstable state Unstable state occurs from the inside gate voltage of p channel or n channel transistor into active As a result power supply current may increase And unstable state can also cause unexpected operation of IC So unless otherwise specified input terminals not being used should be connected to the power supply or GND line 13 Thermal shutdown circuit TSD When junction temperatures become setting temperature or higher the thermal shutdown circuit operates and turns a switch OFF The thermal shutdown circuit which is aimed at isolating the LSI from thermal runaway as much as possible is not aimed at the protection or guarantee of the LSI Therefore do not continuously use the LSI with this circuit operating or use the LSI assuming its operation 14 Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation Pd in actual states of use www rohm com 11 12 2011 04 Rev A 2011 ROHM Co Ltd All rights reserved BD
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ROHM BD7700GU handbook