DC Brushless Fan Motor Driver 5V Single-phase Full-wave Fan Motor Driver BU6909AGFT Description The BU6909AGFT is a 5V single-phase full-wave FAN motor driver with built in HALL element. It is part of the DC brushless FAN motor driver series. BU6909AGFT is built in a compact package and provides Auto Gain Control function (AGC), silent drive by soft switching, and low battery consumption via its standby function. BU6909AGFT is best used for notebook PC cooling FANs. Features Built in HALL element Auto Gain Control function (AGC) Soft switching drive (PWM type) Low PWM duty start up Quick start function Stand-by mode Incorporates lock protection and automatic restart circuit Compact package (GFT:TSSOF6 flat lead package) When TSSOF6 is mounted, package thickness is 0.3mm Rotating speed pulse signal (FG) output PWM speed control Package TSSOF6 W(Typ) x D(Typ) x H(Max) 2.90mm x 3.80mm x 0.8mm TSSOF6 Applications For compact 5V FAN such as notebook PC cooling FAN Absolute Maximum Ratings Parameter Symbol Limit Unit Supply Voltage VCC 7 V Power Dissipation Pd 0.54(Note 1) W Operating Temperature Topr -40 to +85 °C Storage Temperature Tstg -55 to +125 °C Output Voltage VOMAX 7 V Output Current IOMAX 800(Note 2) mA VFG 7 V IFG 10 mA Tjmax 125 °C FG Signal Output Voltage FG Signal Output Current Junction Temperature (Note 1) Reduce by 5.4mW/℃ over 25℃. (On 70.0mm×70.0mm×1.6mm glass epoxy board) (Note 2) This value is not to exceed Pd. Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over the absolute maximum ratings. Recommended Operating Condition Parameter Operating Supply Voltage Range Symbol Limit Unit VCC 1.8 to 5.5 V ○Product structure：Silicon monolithic integrated circuit .www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・14・001 ○This product has no protection against radioactive rays 1/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Block Diagram HALL ELEMENT This is an open drain output. Connect a pull-up resistor. FG Page 15. VCC OFFSET CANCEL 1 6 A/D CONVERSION OSCILLATOR CIRCUIT GND 2 Consider protection against voltage rise due to reverse connection of power supply and back electromotive force. Page 14. PWM UVLO 5 CONTROL LOGIC TSD PRE DRIVER Enables speed control by applying external PWM signal. Maximum input frequency is 50KHz. Page 10. OUT2 H-BRIDGE OUT1 3 4 PWM DUTY LOCK PROTECTION Conventional FAN motor driver IC with HALL element requires adjustment of HALL bias resistor due to several factors that affect the HALL Amplitude. This IC automatically adjusts HALL amplitude through the use of a built in HALL element and unique AGC function. Page 8. SIGNAL OUT M (Heatrejection protection circuit) TSD : Thermal shut down(heat circuit) UVLO :Under voltage lock outputs (low voltage protection circuit) Figure 1. Block diagram and Application circuit Pin Description Pin No. Pin Name 1 FG Function FG signal output 2 GND GND 3 OUT1 Motor output 1 4 OUT2 Motor output 2 5 PWM PWM signal input 6 VCC Power supply I/O truth table ・Supply magnetic direction (positive) ・Output operation S VOUT1 Marking VOUT2 BHYS BHYS BREV N B FWD BREV Magnetic flux density:B BFWD Magnetic flux density:B Figure 2. Output operation Supply magnetic direction S N S N PWM* OUT1 OUT2 FG H(OPEN) H(OPEN) L L H L L L L H L L L (Output Tr：ON) H (Output Tr：OFF) H (Output Tr：OFF) H (Output Tr：OFF) *When PWM terminal is L, IC state changes to stand-by mode. FG terminal is always H in stand-by mode www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Electrical Characteristics (Unless otherwise specified Ta=25°C, VCC=5V) Parameter Symbol MIN TYP MAX Unit Conditions Characteristics Circuit Current 1 ICC1 - 2 4 mA PWM=OPEN Figure 3 Circuit Current 2 (stand-by mode) ICC2 - 25 50 µA PWM=GND Figure 4 Magnetic Switch-point for Forward Rotation BFWD - 1.5 Magnetic Switch-point for Reverse Rotation BREV Magnetic hysteresis BHYS PWM Input H Level PWM Input L Level mT Figure 5 -1.5 - mT Figure 6 - 3.0 5.0 mT Figure 7 VPWMH 2.5 - VCC V - VPWML 0 - 0.8 V - fPWM 5 - 50 kHz - Output Voltage VO - 0.16 0.24 V Io=200mA Upper and Lower total Figure 8 to 13 FG Low Voltage VFGL - - 0.4 V IFG=5mA Figure 14,15 FG Leak Current IFGL - - 5 µA VFG=7V Figure 16 Lock Detection ON Time tON 0.35 0.50 0.65 s Figure 17 Lock Detection OFF Time tOFF 3.5 5.0 6.5 s Figure 18 PWM Input Frequency www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Typical Performance Curves 100 80 3.0 Circuit current : IC C2 [µA] Circuit current : I CC1 [mA] 4.0 85°C 25°C -40°C 2.0 1.0 60 40 85°C 25°C -40°C 20 Operating Voltage Range Operating voltage range 0 0.0 1 2 3 4 5 Supply voltage : VCC [V] 1 6 2.5 2.0 1.5 85°C 25°C -40°C 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2.0 OperatingVoltage voltage Range range Operating -2.5 1 2 3 4 5 Supply voltage : VCC [V] 6 Figure 5. Magnetic Switch-point for Forward Rotation www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3 4 5 Supply Voltage : VCC [V] 6 Figure 4. Circuit Current 2 (Stand-by mode) Magnetic switch-point for reverse rotation : BREV [mT] Magnetic switch-point for forward rotation : BFWD [mT] Figure 3. Circuit Current 1 2 4/18 2.5 2.0 1.5 1.0 0.5 0.0 -0.5 -40°C 25°C 85°C -1.0 -1.5 -2.0 Operating voltage range 動作電圧範囲 -2.5 1 2 3 4 5 Supply voltage : VCC [V] 6 Figure 6. Magnetic Switch-point for Reverse Rotation TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Typical Performance Curves - continued 1.0 2.5 0.8 85℃ Output H voltage : VOH [V] Magnetic hysteresis : Bhys [mT] 3.0 25℃ 2.0 -40℃ 1.5 1.0 0.6 0.4 85°C 25°C -40°C 0.2 0.5 Operating voltage range 0.0 0.0 1 2 3 4 5 Supply voltage : Vcc [V] 0.0 6 1.0 1.0 0.8 0.8 0.6 1.8V 0.4 5.0V 5.5V 0.2 0.4 0.6 Output current : IO [A] 0.8 Figure 8. Output H Voltage (Temperature Characteristics) Output L voltage : VOL [V] Output H voltage : VOH [V] Figure 7. Magnetic hysteresis 0.2 0.6 85°C 0.4 25°C -40°C 0.2 0.0 0.0 0.0 0.2 0.4 0.6 Output current : IO [A] 0.8 Figure 9. Output H Voltage (Voltage Characteristics) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0.0 0.2 0.4 0.6 Output current : IO [A] 0.8 Figure 10. Output L Voltage (Temperature Characteristics) 5/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Typical Performance Curves - continued 1.0 1.0 1.8V 0.8 Output voltage : VO [V] Output L voltage : VOL [V] 0.8 0.6 0.4 5.0V 5.5V 85°C 25°C 0.6 -40°C 0.4 0.2 0.2 0.0 0.0 0.0 0.2 0.4 0.6 Output current : IO [A] 0.8 0.0 Figure 11. Output L Voltage (Voltage Characteristics) 0.2 0.4 0.6 Output current : IO [A] 0.8 Figure 12. Total Output Voltage (Output H and L) (Temperature Characteristics) 0.5 1.0 1.8V 0.6 FG output L voltage : VFGL [V] Output voltage : VO [V] 0.8 5.0V 5.5V 0.4 0.2 0.4 85°C 0.3 25°C -40°C 0.2 0.1 0.0 0.0 0.0 0.2 0.4 0.6 Output current : IO [A] 0.8 Figure 13. Total Output Voltage (Output H and L) (Voltage Characteristics) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 0 2 4 6 FG current : IFG [mA] 8 10 Figure 14. FG Output L Voltage (Temperature Characteristics) 6/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Typical Performance Curves - continued 2.0 0.5 Operating voltage range 0.4 FG leak current : IFGL [µA] FG output L voltage : VFGL [V] 1.8V 0.3 5.0V 5.5V 0.2 0.1 1.5 1.0 85°C 0.5 25°C -40°C 0.0 0.0 0 2 4 6 FG current : IFG [mA] 8 1 10 2 6 Figure 16. FG Output Leak Current Figure 15. FG Output L Voltage (Voltage Characteristics) 1.0 10 Lock detection OFF time : tOFF [s] Lock detection ON time : tON [s] 3 4 5 Supply voltage : VCC [V] 0.8 0.6 85°C 25°C -40°C 0.4 0.2 8 6 85°C 25°C -40°C 4 2 Operating voltage range Operating voltage range 0.0 0 1 2 3 4 5 Supply voltage : VC C [V] 6 Figure 17. Lock Detection ON Time www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 1 2 3 4 5 Supply voltage : VC C [V] 6 Figure 18. Lock Detection OFF Time 7/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Auto gain control Conventional FAN motor driver IC with HALL element requires adjustment of HALL bias resistor for acoustic noise characteristic and motor rotation efficiency because the magnetic field strength and the magnetic field waveform are different in each motor. This IC automatically controls HALL amplitude generated by built in HALL element and motor magnet through the use of a unique AGC function. AGC function needs 15 ms to select the required HALL amp gain when turning on the power, and recovering from stand-by mode and lock protection.(Refer to Figure 23 and 24.) At starting ( Approach AGC area) N HALL signal ( image) Indefinite area [+/-1.5mT] N At driving (AGC control) S S AGC control Pre – AGC area Gain up N Gain up (Insufficient magnetic force area) Pre – AGC area (Best magnetic force area) Motor start up (Excess magnetic force area) Approach AGC area by analog circuit Precise AGC by digital circuit VCC PWM PWM soft-switching time OUT1 OUT2 FG Hall amp gain select time : 15 ms Figure 19. AGC Image of the Hall signal (In case of weak magnetic field) After the startup, the Hall signal is increased by Hall amplifier gain. The increased Hall signal is set by the AGC around the Pre-AGC area, the weak magnetic field of the motor as in Figure 19. To selecting a gain requires about 15ms before it activates the motor. www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Soft switching (PWM type) Soft switching is operated using an output PWM pulse. The output PWM signal is generated by the slope of processed AGC HALL signal. First, the processed AGC HALL signal is converted to absolute waveform. Next, the absolute waveform and the triangular waveform internally generated by the IC are synthesized. The synthesized waveform determines the PWM soft switching duty and the ratio of time. PWM soft switching time depends on motor speed. In case of a slower HALL signal, PWM soft switching time is long due to the obtuse angle of the processed AGC HALL signal (PWM soft switching time is about 2ms to 4ms.). In case of a faster HALL signal, PWM soft switching time is short due to the sharp slope of the AGC HALL signal (PWM soft switching time is about 200µs to 1ms.). And, the triangular wave oscillator inside the IC uses a PWM soft switching frequency of 50kHz (typical). Hence, input PWM frequency is not equal to PWM soft switching frequency. (a) The processed AGC HALL signal is converted to absolute waveform (b) Motor speed is slow (c) Motor speed is fast Figure 20. PWM soft switching signal synthesis www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT PWM control Rotation speed of motor can be changed by controlling ON/OFF of the upper output depending on the duty of the input signal to PWM terminal. When PWM terminal is open, H logic is applied. Output PWM frequency is 50 kHz (Typ). This IC is not direct PWM. Hence, input PWM frequency is not equal to output PWM frequency. Figure 21 shows the characteristic of input PWM duty and output PWM duty. PWM terminal has a built in digital low pass filter (LPF). Output PWM duty has 3.5ms (Max) transitional time from the point of change in input PWM duty, this is caused by the LPF characteristic (reference is shown in Figure 22). Additionally, Input PWM uses frequencies above 5 kHz. Output PWM DUTY [%] 100 80 60 40 20 0 0 20 40 60 80 Input PWM DUTY [%] 100 Figure 21. Characteristic of input PWM DUTY and output PWM DUTY Figure 22. Timing chart of PWM control www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Low duty start up function During motor start up from stop condition, outputs are driven by a PWM signal of about PWM 50% duty for 3 times of changing magnetic direction. After the low PWM duty start up function, output PWM duty changes corresponding to the input PWM duty. For cases of input PWM duty range of more than 50%, output PWM duty changes corresponding to same input PWM duty at all driving time. This function enables the IC to start the motor regardless of input PWM signal’s duty. When input PWM duty is 0%, the motor is held on stand-by mode. Additionally, the motor changes to idling mode for input PWM duty range of 0% to 2.5%. Idling mode only runs on circuit current 1 (ICC1) in the Electrical Characteristics table. Idling mode turns all output terminals to open state. (a) Case A : Input PWM DUTY 2.5% to 50% (b) Case B : Input PWM DUTY 50% to 100% Figure 23. Low duty start up function Table 1. Truth table of input PWM duty and each outputs terminals Input PWM duty [%] IC function (state) DUTY 0 DUTY 0 < 2.5 OFF ON Case A : DUTY 2.5 to 50 ON Case B : DUTY 50 to 100 ON www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 (Stand-by mode) (Idle mode) (Low duty start up driving) (Normal driving) 11/18 OUT1, OUT2 FG OFF, OFF (Open state) OFF, OFF (Open state) H (Output Tr : OFF) H (Output Tr : OFF) H / L, L / H H/L H / L, L / H H/L TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Quick start function This series has an integrated quick start function. When the PWM signal is input, this function can start up the motor at once regardless of the detection time of the lock protection function. (Consider HALL amp gain select time. Reference is shown in Figure 24.) Stand-by mode Stand-by function turns off the circuit when the time of PWM=L has elapsed in order to reduce stand-by current. The circuit current consumption during stand-by mode is specified at the parameter “Circuit current 2” of the electrical characteristics. Figure 24 shows the timing diagram of stand-by mode and quick start function. The 0% detection time before the IC changes to stand-by mode is variable depending on the input PWM duty. This is because of the built in LPF at the PWM terminal. As an example, Figure 25 shows the characteristic curve of 0% detection time and input PWM duty for a 25kHz input PWM frequency. Figure 24. Stand-by mode and quick start function Input PWM DUTY [%] 100 80 60 40 20 0 0.0 1.0 2.0 3.0 0% detection time : t0 [ms] 4.0 Figure 25. Characteristic curve of 0% detection time and input PWM duty at 25kHz Lock protection and automatic restart Motor rotation is detected by HALL signal, while lock detection ON time (tON) and lock detection OFF time (tOFF) are set by IC internal counter. External part (C or R) is not required. Timing chart is shown in Figure 26. Figure 26. Lock protection timing chart www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 12/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Equivalent circuit 1) Supply voltage terminal 2) PWM signal input terminal VCC VCC 200kΩ PWM 10kΩ GND 3) FG output terminal 4) Motor output terminal FG VCC OUT1 OUT2 GND GND HALL position (Reference data) www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Safety measure 1) Reverse connection protection diode Reverse connection of power results in IC destruction as shown in Figure 27. When reverse connection is possible, reverse connection protection diode must be added between power supply and VCC. In normal energization After reverse connection destruction prevention Reverse power connection VCC VCC Circuit block VCC Circuit block Each Pin GND Each Pin Circuit block GND GND Large current flows → Thermal destruction Internal circuit impedance high → amperage small Each Pin No destruction Figure 27. Flow of current when power is connected reversely 2) Protection against VCC voltage rise by back electromotive force Back electromotive force (Back EMF) generates regenerative current to power supply. However, when reverse connection protection diode is connected, VCC voltage rises because the diode prevents current flow to power supply. ON ON ON Phase switching ON Figure 28. VCC voltage rise by back electromotive force When the absolute maximum rated voltage may be exceeded due to voltage rise by back electromotive force, place a (A) Capacitor or (B) Zener diode between VCC and GND. If necessary, add both (C). (D) Capacitor and resistor can also be used to have better ESD surge protection. (A) Capacitor (B) Zener diode ON ON ON ON (C) Capacitor and Zener diode (D) Capacitor and resistor ON ON ON ON Figure 29. Protection against VCC voltage rise www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT 3) Problem of GND-line PWM switching Do not perform PWM switching of GND line because GND terminal potential cannot be kept to a minimum. VCC Motor Driver M GND Controller PWM input Prohibite Figure 30. GND Line PWM switching prohibited 4) FG output FG output is an open drain output and requires pull-up resistor. A VCC voltage that is beyond its absolute maximum rating when FG output terminal is directly connected to power supply, could damage the IC. The IC can be protected by adding resistor R1 (as shown in Figure 31). VC C Pull-up resistor FG R1 Protection resistor C onnector of board Figure 31. Protection of FG terminal Thermal derating curve Thermal derating curve indicates power that can be consumed by IC with reference to ambient temperature. Power that can be consumed by IC begins to attenuate at certain ambient temperature. This gradient is determined by thermal resistance θja. Thermal resistance θja depends on chip size, power consumption, package ambient temperature, packaging condition, wind velocity, etc., even when the same package is used. Thermal derating curve indicates a reference value measured at a specified condition. Figure 32. shows a thermal derating curve. POWER DISSIPATION : Pd [W] 0.6 0.5 0.4 0.3 0.2 0.1 0.0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE : Ta [℃] Reduce by 5.4mW/℃ over 25℃. (70.0mm×70.0mm×1.6mm FR4 glass epoxy board) Figure 32. Thermal derating curve www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 15/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Operational Notes 1. Reverse Connection of Power Supply Connecting the power supply in reverse polarity can damage the IC. Take precautions against reverse polarity when connecting the power supply, such as mounting an external diode between the power supply and the IC’s power supply pins. 2. Power Supply Lines Design the PCB layout pattern to provide low impedance supply lines. Separate the ground and supply lines of the digital and analog blocks to prevent noise in the ground and supply lines of the digital block from affecting the analog block. Furthermore, connect a capacitor to ground at all power supply pins. Consider the effect of temperature and aging on the capacitance value when using electrolytic capacitors. 3. Ground Voltage Ensure that no pins are at a voltage below that of the ground pin at any time, even during transient condition. However, pins that drive inductive loads (e.g. motor driver outputs, DC-DC converter outputs) may inevitably go below ground due to back EMF or electromotive force. In such cases, the user should make sure that such voltages going below ground will not cause the IC and the system to malfunction by examining carefully all relevant factors and conditions such as motor characteristics, supply voltage, operating frequency and PCB wiring to name a few. 4. Ground Wiring Pattern When using both small-signal and large-current ground traces, the two ground traces should be routed separately but connected to a single ground at the reference point of the application board to avoid fluctuations in the small-signal ground caused by large currents. Also ensure that the ground traces of external components do not cause variations on the ground voltage. The ground lines must be as short and thick as possible to reduce line impedance. 5. Thermal Consideration Should by any chance the power dissipation rating be exceeded the rise in temperature of the chip may result in deterioration of the properties of the chip. The absolute maximum rating of the Pd stated in this specification is when the IC is mounted on a 70mm x 70mm x 1.6mm glass epoxy board. In case of exceeding this absolute maximum rating, increase the board size and copper area to prevent exceeding the Pd rating. 6. Recommended Operating Conditions These conditions represent a range within which the expected characteristics of the IC can be approximately obtained. The electrical characteristics are guaranteed under the conditions of each parameter. 7. Inrush Current When power is first supplied to the IC, it is possible that the internal logic may be unstable and inrush current may flow instantaneously due to the internal powering sequence and delays, especially if the IC has more than one power supply. Therefore, give special consideration to power coupling capacitance, power wiring, width of ground wiring, and routing of connections. 8. Operation Under Strong Electromagnetic Field Operating the IC in the presence of a strong electromagnetic field may cause the IC to malfunction. 9. Testing on Application Boards When testing the IC on an application board, connecting a capacitor directly to a low-impedance output pin may subject the IC to stress. Always discharge capacitors completely after each process or step. The IC’s power supply should always be turned off completely before connecting or removing it from the test setup during the inspection process. To prevent damage from static discharge, ground the IC during assembly and use similar precautions during transport and storage. 10. Inter-pin Short and Mounting Errors Ensure that the direction and position are correct when mounting the IC on the PCB. Incorrect mounting may result in damaging the IC. Avoid nearby pins being shorted to each other especially to ground, power supply and output pin. Inter-pin shorts could be due to many reasons such as metal particles, water droplets (in very humid environment) and unintentional solder bridge deposited in between pins during assembly to name a few. www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 16/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Operational Notes – continued 11. Unused Input Pins Input pins of an IC are often connected to the gate of a MOS transistor. The gate has extremely high impedance and extremely low capacitance. If left unconnected, the electric field from the outside can easily charge it. The small charge acquired in this way is enough to produce a significant effect on the conduction through the transistor and cause unexpected operation of the IC. So unless otherwise specified, unused input pins should be connected to the power supply or ground line. 12. Regarding the Input Pin of the IC In the construction of this IC, P-N junctions are inevitably formed creating parasitic diodes or transistors. The operation of these parasitic elements can result in mutual interference among circuits, operational faults, or physical damage. Therefore, conditions which cause these parasitic elements to operate, such as applying a voltage to an input pin lower than the ground voltage should be avoided. Furthermore, do not apply a voltage to the input terminals when no power supply voltage is applied to the IC. Even if the power supply voltage is applied, make sure that the input terminals have voltages within the values specified in the electrical characteristics of this IC. 13. Ceramic Capacitor When using a ceramic capacitor, determine the dielectric constant considering the change of capacitance with temperature and the decrease in nominal capacitance due to DC bias and others. 14. Thermal Shutdown Circuit(TSD) This IC has a built-in thermal shutdown circuit that prevents heat damage to the IC. Normal operation should always be within the IC’s power dissipation rating. If however the rating is exceeded for a continued period, the junction temperature (Tj) will rise which will activate the TSD circuit that will turn OFF all output pins. When the Tj falls below the TSD threshold, the circuits are automatically restored to normal operation. Note that the TSD circuit operates in a situation that exceeds the absolute maximum ratings and therefore, under no circumstances, should the TSD circuit be used in a set design or for any purpose other than protecting the IC from heat damage. Marking Diagrams TSSOF6(TOP VIEW) A B LOT Number Part Number Marking 1 PIN MARK www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 17/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Datasheet BU6909AGFT Physical Dimension, Tape and Reel Information Package Name www.rohm.com © 2014 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 TSSOF6 18/18 TSZ02201-0H1H0B101190-1-2 28.Oct.2014 Rev.002 Notice 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 (Note 1) 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. (Note1) Medical Equipment Classification of the Specific Applications JAPAN USA EU CHINA CLASSⅢ CLASSⅡb CLASSⅢ CLASSⅢ CLASSⅣ CLASSⅢ 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. 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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. 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 on a surface-mount products, the flow soldering method must be used on a through hole mount products. If the flow soldering method is preferred on a surface-mount products, please consult with the ROHM representative in advance. For details, please refer to ROHM Mounting specification Notice-GE © 2013 ROHM Co., Ltd. All rights reserved. Rev.003 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. Other Precaution 1. This document may not be reprinted or reproduced, in whole or in part, without prior written consent of ROHM. 2. The Products may not be disassembled, converted, modified, reproduced or otherwise changed without prior written consent of ROHM. 3. 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. 4. 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-GE © 2013 ROHM Co., Ltd. All rights reserved. Rev.003 Datasheet General Precaution 1. Before you use our Pro ducts, you are requested to care fully read this document and fully understand its contents. ROHM shall n ot be in an y way responsible or liabl e for fa ilure, malfunction or acci dent arising from the use of a ny ROHM’s Products against warning, caution or note contained in this document. 2. All information contained in this docume nt is current as of the issuing date and subj ect to change without any prior notice. Before purchasing or using ROHM’s Products, please confirm the la test information with a ROHM sale s representative. 3. The information contained in this doc ument is provi ded on an “as is” basis and ROHM does not warrant that all information contained in this document is accurate an d/or error-free. ROHM shall not be in an y way responsible or liable for an y damages, expenses or losses incurred b y you or third parties resulting from inaccur acy or errors of or concerning such information. Notice – WE © 2014 ROHM Co., Ltd. All rights reserved. Rev.001