Datasheet For 2Cell Solar, Synchronous Switch-Mode Charger IC BU1840AMUV ●General Description The BU1840AMUV device provides the best system to the product charged with 1cell Li-ion battery and 3cell Nickel-metal-hydride batteries using the 2cell, 3cell, and 4cell solar panel. It is possible to boost it according to the voltage of 2 cell solar panel with built-in the function to boost the low voltage input. Moreover, the solar battery maximum dissipation can be drawn out with built-in the peak power track function. It is possible to select the the switching frequency according to the terminal SEL. It is also possible to monitor the charging current by the I2C interface. Built in heat reckless driving protection (Thermal shutdown), decrease voltage protection, and input current protection for protection function ●Applications Solar mobile phone Solar audio Solar portable charger Solar LED illumination W(Typ.) x D(Typ.) x H(Max.) 4.00mm x 4.00mm x 1.00mm ●Package(s) VQFN024V4040 ●Features Synchronous Switch-Mode Charger for 2Cell Solar [email protected]=3.7V,VIN=1V MPPT control voltage range：0.7V～1.5V Charging current completion voltage： 5.0V (hysteresis: 0.075V) Built in MPPT Switching frequency (160kHz,320kHz) Charging current monitor by I2C UVLO-detect Voltage:0.625V UVLO-release Voltage:0.700V Thermal Shutdown 24 pin VQFN024V4040 (4.1mm×4.1mm<MAX>) VQFN024V4040 ●Typical Application Circuit(s) ●Typical Performance characteristics <For 2 Cells Solar> <Efficiency (for 2 cells solar)> (VINMON=1.0V, OUTS=3.7V, Pin = 50mW ～ 2W) 100 SEL=GND Efficiency [%] SEL=VIN 90 80 70 10 ○Product structure：Silicon monolithic integrated circuit .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 100 Pin [mW] 1000 10000 ○This product is not designed protection against radioactive rays 1/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Absolute maximum ratings (Ta=25℃) Parameter Symbol Ratings Unit Maximum applied voltage 1 Vmax1 7.0 V Maximum applied voltage 2 Vmax2 2.5 V Power dissipation1 Pd1 560 ｍW Power dissipation2 Pd2 1766 ｍW Operating temperature range Topr -30～+85 ℃ Storage temperature range Tstr -55～+150 ℃ Conditions VIO,SDA,SCL,SW1,2,3, ENB COREVDD,OUTP1,2,OUTPM,OUTS VIN,VINMON,V18,IMON,PCOMP, SEL,OSC 1layer(74.2x74.2mm)boad 2 (Surface heat radiation copper foil：6.28mm ) 4layer(74.2x74.2mm)boad 2 (1,4layer heat radiation copper foil：6.28mm ) 2 (2,3layer heat radiation copper foil：5500mm ) *1 When it is used by more than Ta=25℃, it is reduced by 5.6mW/℃. *1 *2 When it is used by more than Ta=25℃, it is reduced by 17.66mW/℃. ●Operating conditions (Ta=25℃) Parameter Symbol Ratings Unit Power supply voltage range 1 VCC1 0.625～1.98 V VIN terminal voltage Power supply voltage range 2 VCC2 1.7～5.5 V VIO terminal ●Electrical characteristics (Unless otherwise specified: Ta=25℃, VIN=1.0V) Rating Parameter Symbol Min. Typ. Max. Conditions Unit Conditions MPPT control minimum voltage MPPTL - - 0.7 V VINMON-monitor MPPT control maximum voltage MPPTH 1.5 - - V VINMON-monitor MPPT-VIN control voltage resolution PPTVT 12.5 25.0 37.5 mV UVLO Release Threshold VuvloR 0.6 0.7 0.8 V VIN-rising UVLO Detect Threshold VuvloD 0.575 0.625 0.675 V VIN-falling Vuvlohys 30 80 130 mV MPPT start up voltage Vst1 2.45 2.6 2.75 V Charging current completion voltage Vch2 4.93 5.0 5.07 V Circuit current 1 (VIN-CURRENT) ICC1 - - 1.0 mA Circuit current 2 (OUTS-CURRENT) ICC2 - - 2 uA ICC3 - - 4 uA UVLO Hysteresis COREVDD-monitor (hys=0.3V) OUTS-monitor RISING. (hysteresis=0.075V) ENB=1V, SW=VIN ENB=1V, OUTS,P=5.2V, COREVDD=3.7V ENB=0V, OUTS,P=5.2V COREVDD=3.7V Circuit current 3 (OUTS-CURRENT) Not-Switching Nch-SW ON registor Rnsw - 60 - mΩ Pch-SW ON registor Rpsw - 100 - mΩ Input over current limiter DCDC switching frequency 1 (SEL=VIN) DCDC switching frequency 2 (SEL=GND) Charging current voltage range VIlim 3.0 4.0. 5.0 A Fosc1 260 320 380 kHz OSC2OUT Fosc2 130 160 190 kHz OSC2OUT VImon 0 40 mV V(OUTPM)-V(OUTS) Charging current monitor accuracy 1 Imon1 0D 2B 49 Hex V(OUTPM)-V(OUTS)=0mV Charging current monitor accuracy 2 Imon2 88 A6 BF Hex V(OUTPM)-V(OUTS)=40mV Logic operating clock Logosc - 30 - kHz C4=100pF ENB ”H” level voltage Venh 1.1 - - V POWER-OFF ENB ”L” level voltage Venl 0 - 0.2 V POWER-ON .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Electrical characteristics (Unless otherwise specified: Ta=25℃, VIO=1.8V) Item Symbol Min. Typ. Max. Unit L level input voltage VIL1 -0.3 - 0.25 × VIO V H level input voltage VIH1 - VIO +0.3 V Hysteresis width Vhys1 - - V Conditions 2 【I C input (SDA, SCL)】 L level output voltage (Sink current = 3mA) Input current 0.75 × VIO 0.05 × VIO VOL1 0 - 0.3 V Iin1 -3 - 3 μA SDA pin Pin voltage=0～VIO 2 ●I C BUS format 2 The writing/reading operation is based on the I C slave standard. ・Slave address A7 1 A6 1 A5 1 A4 0 A3 0 ・Bit Transfer SCL transfers 1-bit data during H. SCL cannot change signal of SDA during H at the time of bit transfer. If SDA changes while SCL is H, START conditions or STOP conditions will occur and it will be interpreted as a control signal. ・START and STOP condition When SDA and SCL are H, data is not transferred on 2 the I C- bus. This condition indicates, if SDA changes from H to L while SCL has been H, it will become START (S) conditions, and an access start, if SDA changes from L to H while SCL has been H, it will become STOP (P) conditions and an access end. ・Acknowledge It transfers data 8 bits each after the occurrence of START condition. A transmitter opens SDA after transfer 8bits data, and a receiver returns the acknowledge signal by setting SDA to L. A2 0 A1 1 R/W 1/0 SDA SCL SDA SDA a state of stability： It can change Data are effective SDA SCL S P STOP condition START condition DATA OUTPUT BY TRANSMITTER ・Protocol not acknowledge DATA OUTPUT BY RECEIVER acknowledge SCL S START condition 1 2 8 9 clock pulse for acknowledgement Legend The mastering side is a transmitter. The slave side is a receiver. A Acknowledge S Start condition The slave side is a transmitter. The mastering side is a receiver. A Unacknowledged P Stop condition .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/14 Sr Repetition start condition TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV 1. Writing protocol A register address is transferred by the next 1 byte that transferred the slave address and the write-in command. The 3rd byte writes data in the internal register written in by the 2nd byte, and after 4th byte or, the increment of register address is carried out automatically. However, when a register address turns into the last address, it is set to 00h by the next transmission. After the transmission end, the increment of the address is carried out. *1 S X X X X X X X 0 A A7 A6 A5 A4 A3 A2 A1 A0 A D7 D6 D5 D4 D3 D2 D1 D0 A slave address register address *1 D7 D6 D5 D4 D3 D2 D1 D0 A P DATA DATA register address increment R/W=0(write) register address increment A=acknowledge(SDA LOW) A=not acknowledge(SDA HIGH) S=START condition P=STOP condition *1: Write Timing from master to slave from slave to master 2. Reading protocol It reads from the next byte after writing a slave address and R/W bit. The register to read considers as the following address accessed at the end, and the data of the address that carried out the increment is read after it. If an address turns into the last address, the next byte will read out 00h. After the transmission end, the increment of the address is carried out. S X X X X X X X 1 A D7 D6 D5 D4 D3 D2 D1 D0 A slave address D7 D6 D5 D4 D3 D2 D1 D0 A P DATA DATA register address increment register address increment R/W=1(read) A=acknowledge(SDA LOW) A=not acknowledge(SDA HIGH) S=START condition P=STOP condition from master to slave from slave to master 3. Multiple reading protocols After specifying an internal address, it reads by repeated START condition and changing the data transfer direction. The data of the address that carried out the increment is read after it. If an address turns into the last address, the next byte will read out 00h. After the transmission end, the increment of the address is carried out. S X X X X X X X 0 A A7 A6 A5 A4 A3 A2 A1 A0 A Sr X X X X X X X 1 A slave address register address slave address R/W=0(write) R/W=1(read) D7 D6 D5 D4 D3 D2 D1 D0 A D7D6 D5D4D3D2D1D0 A P DATA DATA register address increment from master to slave from slave to master register address increment A=acknowledge(SDA LOW) A=not acknowledge(SDA HIGH) S=START condition P=STOP condition Sr=repeated START condition ※ As for reading protocol and multiple reading protocols, please do A(not acknowledge) after doing the final reading operation. It stops with read when ending by A (acknowledge), and SDA stops in the state of Low when the reading data of that time is 0. However, this state returns usually when SCL is moved, data is read, and A (not acknowledge) is done. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 4/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Electrical Characteristics(Unless otherwise specified, Ta=25 ℃, VIO=1.8V) Item Symbol 【I2C BUS format】 SCL clock frequency fSCL Standard-mode Fast-mode Typ. Min. Typ. Max. Min. Typ. Max. - 100 - 0 1.3 - 400 - kHz LOW period of the SCL clock tLOW 0 4.7 HIGH period of the SCL clock tHIGH 4.0 - - 0.6 - - μs tHD;STA 4.0 - - 0.6 - - μs Set-up time for a repeated START condition tSU;STA 4.7 - - 0.6 - - μs Data hold time tHD;DAT 0 - 3.45 0 - 0.9 μs Data set-up time tSU;DAT 250 - - 100 - - ns Set-up time for STOP condition tSU;STO 4.0 - - 0.6 - - μs tBUF 4.7 - - 1.3 - - μs Hold time for a repeated START condition Bus free time between a STOP and START condition μs ●Timing diagram SDA t BUF t SU;DAT t LOW t HD;STA SCL t HD;STA t SU;STO t SU;STA t HD;DAT S Sr t HIGH P S D0 INITIAL ●Register Map Address Symbol Name R/W D7 D6 D5 D4 D3 D2 D1 00h SFTRST W - - - - - - - 01h ADCDATA R ADC DATA7 ADC DATA6 ADC DATA5 ADC DATA4 ADC DATA3 ADC DATA2 ADC DATA1 SFT RST ADC DATA0 Function 00h 00h Please input "0" to "-". In an empty address, there is a possibility of doing assign to the register for the test. The access to a register for the test and an undefined register is prohibited. The I2C control timing and the internal operation of IC timing become asynchronous relations when reading out data from the outside. I hope measures so as not to become a problem on the application as the agreement sequence is compare three times. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 5/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Register Explanation Address 00h Symbol Name SFTRST R/W D7 D6 D5 D4 D3 D2 D1 D0 INITIAL データ内容 W - - - - - - - SFT RST 00h ソフトウェア リセット制御入力 Bit name Bit SFTRST D0 Function RST (All registers are initialized.) 0 1 Normal Reset After initializing this all registers when SFTRST: D0=1 is done in WRITE, the value of this register returns to an initial value, too. Address 01h Symbol Name ADCDATA D7-D0: R/W R D7 ADC DATA7 D6 ADC DATA6 D5 ADC DATA5 D4 ADC DATA4 D3 ADC DATA3 D2 D1 D0 INITIAL ADC DATA2 ADC DATA 1 ADC DATA0 00h データ内容 ADCDATA7-0 8bitADC data（Initial 00h） Note）When not charging it (V18<1.6V & DET4OUT=HI <full charge>), doesn't return the acknowledge signal. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 6/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Block diagram VINMON SDA SCL VIN VIO SW1,2,3 I2C OSC2OUT DET3OUT OSC2 DET3 (1.6V) (160kHz, 320kHz) DET1 0.7V OSC1 V18REG V18 DET2OUT VIN DET2 (2.6V) 500k COREVDD Current limiter SEL VIN OUTP1,2 SWP OSC1OUT SWN 500k ENB DCDC Control PGND1,2,3 + + DET4OUT - DET4 (5V) OUTS - DACOUT MMPT Control DAC OSC3OUT OSC3 AGND1,2 PCOMP ADCOUT ADC OSC Current Sense OUTPM IMON ●Block Operation Characteristics DET1：The voltage of VINMON is detected. (It has hysteresis characteristics.) 0.700V-DETECT 0.625V-RELEASE DET2：The voltage of COREVDD (2.6V) is detected. (It has hysteresis characteristics.) 2.6V-DETECT 2.3V-RELEASE DET3：The voltage of V18 is detected. (It has hysteresis characteristics.) 1.6V-DETECT 1.5V-RELEASE DET4：The voltage of OUTS is detected. (It has hysteresis characteristics.) 5.0V-DETECT 4.925V-RELEASE OSC1：It is an oscillator. It operates at the self-excitation boost. OSC2：It is an oscillator. It operates at MPPT. SEL= GND：frequency=160kHz SEL= VIN ：frequency=320kHz OSC3：It is an oscillator. It uses it for the clock in the MPPT-CONTROL Block and the A/D Block. DAC ：It is D/A converter. A standard voltage of MPPT is output. ADC ：It is A/D converter. The analogue signal amplified in the Current-Sense block is converted into the digital signal. Current-Sense：The OUTPM-OUTS voltage is amplified. V18REG：Internal power supply V18 is generated from COREVDD. Current-limiter：The current that flows from SW to PGND is detected. I2C：It is I2C interface block. VIO is made a power supply. MPPT-Control：To charge it by the solar battery maximum dissipation, it controls. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 7/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Charging Current Sense Register (R1) It is necessary to decide the constant of R1 in proportion to the maximum charge current. Maximum charging current ＝ “Maximum input power” × “Efficiency” ÷ “Voltage of battery” Maximum charging current [mA] R1 [mΩ] Maximum charging current [mA] R1 [mΩ] 60 560 350 100 80 470 400 100 100 390 480 82 120 330 580 68 150 220 700 56 200 180 820 47 250 150 1000 39 300 120 1200 33 ●Charging Current Data The current for each 1bit of the charge current data is decided by the following calculating formula Charging current＝(Charging current data[Hex]－2B[Hex]) × ”Charging current / 1bit” R1 [mΩ] Charging current/1bit [mA] R1 [mΩ] Charging current/1bit [mA] 33 9.685 150 2.131 39 8.195 180 1.776 47 6.800 220 1.453 56 5.707 270 1.184 68 4.700 330 0.9685 82 3.898 390 0.8195 100 3.196 470 0.6800 120 2.663 560 0.5707 .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Operating Sequence 0.7V 0.7V VIN MPPT Calculation Voltage MPPT Calculation Voltage MPPT Voltage 0.7V 0.7V MPPT Voltage VIN MON DET1OUT (Inter-node) OSC1OUT (Inter-node) DET2OUT (Inter-node) 1.6V V18 DET3OUT (Inter-node) OSC2OUT (Inter-node) MPPT Calculation Voltage DACOUT (Inter-node) MPPT Calculation Voltage MPPT Voltage MPPT Voltage ADCDATA (I2C-Inter face) Changing Current Monitor Charging Current Monitor DET4OUT (Inter-node) COREVDD 2.6V 5.0V 4.925V OUTS Operation Boost Stop Self Boost MPPT Operation Boost Stop MPPT Operation Boost Stop Note) When MPPT operating, it is calculated of MPP each 158mS. (Logosc=30kHz) The amount of the MPP voltage change is 25mV step. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Pin Layout ●Package Diagram No. PIN Name Function 1 SCL 2 SDA 3 VINMON 4 IMON 5 OUTS 6 AGND1 Charging current sense pin 1 GND pin 7 OUTP1 8 OUTP2 I2C Interface clock input pin I2C Interface data input and output pin VIN monitor pin ESD Diode GND side High side VIO AGND VIO AGND - AGND COREVDD AGND - AGND COREVDD AGND Output voltage pin - AGND Output voltage pin - AGND 9 SW1 Inductor connect pin - - 10 SW2 Inductor connect pin - - 11 SW3 - - 12 OUTPM - AGND 13 PGND1 Inductor connect pin Charging current sense pin 2 GND pin COREVDD AGND 14 PGND2 GND pin COREVDD AGND GND pin COREVDD AGND Internal power supply 1 COREVDD AGND V18 AGND VIN AGND VIN AGND 15 PGND3 16 COREVDD 17 V18 18 SEL 19 VIN 20 OSC 21 22 23 V18 AGND PCOMP Internal power supply 2 DCDC switching frequency changing pin SEL = GND ：160kHz SEL = VIN ：320kHz Solar battery input pin Logic frequency adjustment pin Phase compensation pin V18 AGND AGND2 GND pin V18 AGND - AGND VIO AGND ENB Chip enable pin (ON:L、OFF:H) VQFN024V4040VQ Power supply pin for interface 24 VIO When I2C Interface is not used, please connect VIO pin to COREVDD pin. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●How to select parts of application <For 2 Cells Solar> R1 R2 R3 R7 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 L1 D1* Value ※1 24kΩ 10Ω 100mΩ 200uF 0.47uF 0.1uF 100pF 22uF 2.2uF 100uF ※2 22nF 47nF 10uF 470uF ※2 4.7uH～10uH SBD Maker TOKO - <For 4 Cells Solar> Parts D128C - R1 R2 R3 R4 R5 R6 R7 C1 C2 C3 C4 C5 C6 C7 C8 C9 C10 C11 L1 D1* D2 Value ※1 24kΩ 10Ω 100kΩ 100kΩ 1kΩ 100mΩ 200uF 0.47uF 0.1uF 100pF 22uF 2.2uF 100uF ※2 22nF 47nF 10uF 470uF ※2 4.7uH～10uH SBD Zener Di Maker TOKO RENESAS Parts D128C HZ2A1 ※1 Please set a optimal value for R1 depending on maximum charging current. For details, please see p.8 "Charge Current Sense Register (R1)". ※2 Recommended capacitance value of output (OUTS pin) is equivalent to at least 570uF, it is the total of C7(ceramic capacitors) and C11(aluminum electrolytic capacitors) or C7(ceramic capacitors) and C11(tantalum capacitors). When select the ceramic capacitor, it takes some consideration of DC bias effect(s). (Recommended pressure capacity:over 10V) With sensitive application to output ripple voltage, taking measures to reduce ESR(Equivalent Series Resistance) such as increasing of ceramic capacitor or parallel capacitor. * On BU1840AMUV, output voltage (OUTS pin voltage) rise up to 5.07V; it is the highest value of the charge current completion voltage. Please insert the charging control IC between BU1840AMUV output and secondary battery as necessary. * When I2C interface is not in use, please connect VIO pin with COREVDD pin directly. * In case of charging of the battery with low voltage (less than 3.0V), There is a probability of the emergence of the pattern periodically repeating MPPT active/non-active mode and it will cause noise. Please insert SBD between SW pin and COREVDD pin to reduce such noise as necessary. .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 11/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV PGND3 PGND2 PGND1 IMON OUTS AGND1 COREVDD V18 SDA VINMON SEL SCL Low or High ●Notes of board layout BU1840AMUV is switching DCDC converter, so characteristics of noise and etc changing by board layout. Please note the following respect besides a general board layout matter when you make PCB. ●About heat loss In the heat design, please operate it in the following condition. (Please consider the margin etc. because the following temperature is a guarantee temperature.) 1. Surrounding temperature Ta must be 85℃ or less. 2. Loss of IC must be permissible loss Pd or less. 2.0 1.0 1.8 0.9 1.6 0.8 Power Dissipation : Pd (W) Power Dissipation : Pd (W) The allowable dissipation (Pd) characteristics are described below. 1.4 1.2 1.0 0.8 0.7 0.6 0.5 0.4 0.6 0.3 0.4 0.2 0.2 0.1 0.0 0.0 0 25 50 75 100 125 Temperature (℃) 25 50 75 100 125 Temperature (℃) 4layer(74.2×74.2mm)boad (1,4layer heat radiation copper foil：6.28mm2) (2,3layer heat radiation copper foil：5500mm2) .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0 1layer(74.2×74.2mm)boad (Surface heat radiation copper foil：6.28mm2） 12/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Caution on use （1）Absolute Maximum Ratings An excess in the absolute maximum rating, 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 assumed, consideration should be given to take physical safety measures including the use of fuses, etc. （2）The power supply and the GND lines Design PCB pattern to provide low impedance for the wiring between the power supply and the GND lines. Please take care about interference by common impedance of the wiring pattern when there are two or more power supply and GND line. For the GND line, please note the separation of the large current route and the small signal route including the external circuit.Furthermore, for all power supply terminals to ICs, mount a capacitor between the power supply and the GND terminal. 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. （3）GND voltage Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. （4）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. （5）Operation in strong electromagnetic field Be noted that using ICs in the strong electromagnetic field can malfunction them. （6）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. （7）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. （8）Thermal design Perform thermal design in which there are adequate margins by taking into account the permissible dissipation (Pd) in actual states of use. Moreover, please use it within the range where output Tr doesn't exceed the rated voltage and ASO. （9）Rush current In CMOS IC, when the power supply is turned on rush current might flow momentarily in logical internal irregular state. Therefore, note drawing the capacity of the power supply coupling, the power supply, and width and drawing the GND pattern wiring, please. （10）Test terminal and unused terminal processing Please process a test terminal and unused terminal according to explanations of the function manual and the application note, etc. to be unquestionable while real used. Moreover, please inquire of the person in charge of our company about the terminal without the explanation especially. (11)Content of material The application notes etc. are the design material to design the application, and no one of the content securing it. Please decide the application after it examines enough and it evaluates it including external parts. Status of this document The Japanese version of this document is formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document formal version takes priority .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet BU1840AMUV ●Ordering part number B U 1 8 4 0 A Part No. M U V - E 2 Package Wrapping、Forming specification MUV : VQFN024V4040 E2: Reel emboss taping ●Physical Dimension Tape and Reel Information VQFN024V4040 <Tape and Reel information> 4.0±0.1 4.0±0.1 1.0MAX 2.4±0.1 0.4±0.1 7 12 19 18 0.5 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 ) 6 24 0.75 E2 2.4±0.1 1 2500pcs (0.22) +0.03 0.02 -0.02 S C0.2 Embossed carrier tape Quantity Direction of feed 1PIN MARK 0.08 S Tape 13 +0.05 0.25 -0.04 1pin (Unit : mm) Reel Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. ●Marking Diagram(s) VQFN024V4040 (TOP VIEW) Part Number Marking 1 8 4 0 A LOT Number 1PIN MARK .www.rohm.com © 2012 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/14 TSZ02201-0Q1Q0AJ00130-1-2 2.AUG.2012 Rev.001 Datasheet Notice ●General Precaution 1) Before you use our Products, you are requested to carefully read this document and fully understand its contents. ROHM shall not be in any way responsible or liable for failure, malfunction or accident arising from the use of any ROHM’s Products against warning, caution or note contained in this document. 2) All information contained in this document is current as of the issuing date and subject to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the latest information with a ROHM sales representative. ●Precaution on using ROHM Products 1) Our Products are designed and manufactured for application in ordinary electronic equipments (such as AV equipment, OA equipment, telecommunication equipment, home electronic appliances, amusement equipment, etc.). If you intend to use our Products in devices requiring extremely high reliability (such as medical equipment, transport equipment, traffic equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or failure may cause loss of human life, bodily injury or serious damage to property (“Specific Applications”), please consult with the ROHM sales representative in advance. Unless otherwise agreed in writing by ROHM in advance, ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of any ROHM’s Products for Specific Applications. 2) ROHM designs and manufactures its Products subject to strict quality control system. However, semiconductor products can fail or malfunction at a certain rate. Please be sure to implement, at your own responsibilities, adequate safety measures including but not limited to fail-safe design against the physical injury, damage to any property, which a failure or malfunction of our Products may cause. The following are examples of safety measures: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits to reduce the impact of single or multiple circuit failure 3) Our Products are designed and manufactured for use under standard conditions and not under any special or extraordinary environments or conditions, as exemplified below. Accordingly, ROHM shall not be in any way responsible or liable for any damages, expenses or losses arising from the use of any ROHM’s Products under any special or extraordinary environments or conditions. If you intend to use our Products under any special or extraordinary environments or conditions (as exemplified below), your independent verification and confirmation of product performance, reliability, etc, prior to use, must be necessary: [a] Use of our Products in any types of liquid, including water, oils, chemicals, and organic solvents [b] Use of our Products outdoors or in places where the Products are exposed to direct sunlight or dust [c] Use of our Products in places where the Products are exposed to sea wind or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use of our Products in places where the Products are exposed to static electricity or electromagnetic waves [e] Use of our Products in proximity to heat-producing components, plastic cords, or other flammable items [f] Sealing or coating our Products with resin or other coating materials [g] Use of our Products without cleaning residue of flux (even if you use no-clean type fluxes, cleaning residue of flux is recommended); or Washing our Products by using water or water-soluble cleaning agents for cleaning residue after soldering [h] Use of the Products in places subject to dew condensation 4) The Products are not subject to radiation-proof design. 5) Please verify and confirm characteristics of the final or mounted products in using the Products. 6) In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse) is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. 7) De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. 8) Confirm that operation temperature is within the specified range described in the product specification. 9) ROHM shall not be in any way responsible or liable for failure induced under deviant condition from what is defined in this document. Notice - Rev.003 © 2012 ROHM Co., Ltd. All rights reserved. Datasheet ●Precaution for Mounting / Circuit board design 1) When a highly active halogenous (chlorine, bromine, etc.) flux is used, the residue of flux may negatively affect product performance and reliability. 2) In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification ●Precautions Regarding Application Examples and External Circuits 1) If change is made to the constant of an external circuit, please allow a sufficient margin considering variations of the characteristics of the Products and external components, including transient characteristics, as well as static characteristics. 2) You agree that application notes, reference designs, and associated data and information contained in this document are presented only as guidance for Products use. Therefore, in case you use such information, you are solely responsible for it and you must exercise your own independent verification and judgment in the use of such information contained in this document. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties arising from the use of such information. ●Precaution for Electrostatic This Product is electrostatic sensitive product, which may be damaged due to electrostatic discharge. Please take proper caution in your manufacturing process and storage so that voltage exceeding the Products maximum rating will not be applied to Products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). ●Precaution for Storage / Transportation 1) Product performance and soldered connections may deteriorate if the Products are stored in the places where: [a] the Products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] the temperature or humidity exceeds those recommended by ROHM [c] the Products are exposed to direct sunshine or condensation [d] the Products are exposed to high Electrostatic 2) Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using Products of which storage time is exceeding the recommended storage time period. 3) Store / transport cartons in the correct direction, which is indicated on a carton with a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. 4) Use Products within the specified time after opening a humidity barrier bag. Baking is required before using Products of which storage time is exceeding the recommended storage time period. ●Precaution for Product Label QR code printed on ROHM Products label is for ROHM’s internal use only. ●Precaution for Disposition When disposing Products please dispose them properly using an authorized industry waste company. ●Precaution for Foreign Exchange and Foreign Trade act Since our Products might fall under controlled goods prescribed by the applicable foreign exchange and foreign trade act, please consult with ROHM representative in case of export. ●Precaution Regarding Intellectual Property Rights 1) All information and data including but not limited to application example contained in this document is for reference only. ROHM does not warrant that foregoing information or data will not infringe any intellectual property rights or any other rights of any third party regarding such information or data. ROHM shall not be in any way responsible or liable for infringement of any intellectual property rights or other damages arising from use of such information or data.: 2) No license, expressly or implied, is granted hereby under any intellectual property rights or other rights of ROHM or any third parties with respect to the information contained in this document. Notice - Rev.003 © 2012 ROHM Co., Ltd. All rights reserved. Datasheet ●Other Precaution 1) The information contained in this document is provided on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate and/or error-free. ROHM shall not be in any way responsible or liable for any damages, expenses or losses incurred by you or third parties resulting from inaccuracy or errors of or concerning such information. 2) This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 3) The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 4) In no event shall you use in any way whatsoever the Products and the related technical information contained in the Products or this document for any military purposes, including but not limited to, the development of mass-destruction weapons. 5) The proper names of companies or products described in this document are trademarks or registered trademarks of ROHM, its affiliated companies or third parties. Notice - Rev.003 © 2012 ROHM Co., Ltd. All rights reserved.