Datasheet 4.5V to 18V Input, 3.0A Integrated MOSFET Single Synchronous Buck DC/DC Converter BD9C301FJ-LB General Description Key Specifications This is the product guarantees long time support in Industrial market. BD9C301FJ-LB is a synchronous buck switching regulator with built-in low on-resistance power MOSFETs. With wide input voltage range, it is capable of providing current of up to 3 A. It is a current mode control DC/DC converter and features high-speed transient response. Phase compensation can also be set easily. Features Input Voltage Range: Reference Voltage: Maximum Output Current: Switching Frequency: Pch MOSFET On Resistance: Nch MOSFET On Resistance: Standby Current: Operating Temperature Range: Package ■ Long Time Support Product for Industrial Applications. ■ Synchronous Single DC/DC Converter ■ Over Current Protection ■ Thermal Shutdown Protection ■ Under Voltage Lockout Protection ■ Short Circuit Protection ■ Fixed Soft Start Function SOP-J8 4.5V to 18.0V 0.8V ± 1% 3A(Max) 500kHz(Typ) 80mΩ(Typ) 45mΩ(Typ) 1μA (Typ) -40°C to +85°C W(Typ) x D(Typ) x H(Max) 4.90mm x 6.00mm x 1.65mm Applications ■ ■ ■ ■ ■ ■ Industrial Equipment LCD TVs Set-top Boxes DVD/Blu-ray Disc Players/Recorders Broadband Network and Communication Interface Entertainment Devices SOP-J8 Typical Application Circuit Figure 1. Application Circuit ○Product structure: silicon monolithic integrated circuit ○This product has no protection against radioactive rays. www.rohm.com TSZ02201-0J3J0AJ00540-1-2 © 2013 ROHM Co., Ltd. All rights reserved. 1/19 TSZ22111・14・001 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Pin Configuration (TOP VIEW) PGND 1 8 SW VIN 2 7 SW AGND 3 6 EN FB 4 5 COMP Figure 2. Pin Assignment Pin Descriptions Pin No. Pin Name Function 1 PGND 2 VIN 3 AGND 4 FB 5 COMP 6 EN Turning this pin signal low (0.8 V or lower) forces the device to enter the shutdown mode. Turning this pin signal high (2.0 V or higher) enables the device. This pin must be terminated. SW Switch nodes. These pins are connected to the drain of Pch MOSFET and the drain of Nch MOSFET. Ground pins for the output stage of the switching regulator. This pins supply power to the control circuit and the output stage of the switching regulator. Connecting a 10 µF and a 0.1µF ceramic capacitor is recommended. Ground pin for the control circuit. An inverting input node for the gm error amplifier. See page 13 for how to calculate the resistance of the output voltage setting. An input pin for the switch current comparator and an output pin for the gm error amplifier. Connect a frequency phase compensation component to this pin. See page 13 for how to calculate the resistance and capacitance for phase compensation. 7 8 www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Block Diagram EN 6 VREF OSC SCP OCP UVLO IBIAS VIN TSD 2 S FB 7 SW 8 LOGIC ERR 4 OUTPUT SLOPE COMP PWM 5 R PGND 1 SoftStart 3 AGND Figure 3. Block Diagram Absolute Maximum Ratings (Ta = 25C) Parameter Symbol Rating Unit Supply Voltage VIN 20 V SW Pin Voltage VSW 20 V EN Pin Voltage VEN 20 V Power Dissipation (Note 1) Pd 0.68 W Tstg -55 to +150 °C Tjmax 150 °C VLVPINS 7 V Storage Temperature Range Maximum Junction Temperature FB, COMP Pin Voltage Conditions When mounted on a 70 mm x 70 mm x 1.6 mm 1-layer glass epoxy board (Note1) Derate by 5.45 mW when operating above 25C. 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. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 3/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Recommended Operating Conditions Parameter Rating Symbol Min Typ Max Unit Supply Voltage VIN 4.5 - 18.0 V Output Current IOUT - - 3.0 A VRANGE VIN × 0.125(Note 1) - VIN × 0.7 V Tj -40 - +125 °C Output Voltage Setting Range Operating Junction Temperature Range (Note1) VIN×0.125 ≥ 0.8 [V] Electrical Characteristics (Ta = 25C, VIN = 12 V, VEN = 5 V unless otherwise specified) Parameter Symbol Limits Min Typ Max Unit Conditions Circuit Current in Active IQ_active - 1.5 2.5 mA VFB= 0.75V, VEN= 5V Circuit Current in Standby IQ_stby - 1.0 10.0 μA VEN = 0V FB Pin Voltage VFB 0.792 0.800 0.808 V FB-COMP Short (Voltage follower) FB Input Current IFB - 0 2 μA Switching Frequency fOSC 450 500 550 kHz High Side FET On Resistance RONH - 80 - mΩ VIN= 12V , ISW = -1A Low Side FET On Resistance RONL - 45 - mΩ VIN= 12V , ISW = -1A Power MOS Leakage Current ILSW - 0 5 μA VIN= 18V , VSW = 18V Current Limit ILIMIT 3.5 - - A Min_duty - - 12.5 % VUVLO 3.75 4.0 4.25 V VUVLOHYS - 0.2 - V EN High-Level Input Voltage VENH 2.0 - - V EN Low-Level Input Voltage VENL - - 0.8 V Soft Start Time TSS 0.5 1.0 2.0 msec Minimum Duty Ratio UVLO Threshold UVLO Hysteresis Voltage (Note 1) VFB :FB Pin Voltage, VEN :EN Pin Voltage, (Note 2) Current capability should not exceed Pd. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Wake up VIN Voltage ISW :SW Pin Current 4/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Typical Performance Curves 100 110 90 100 80 70 VOUT = 3.3V 80 60 Tc[℃] Efficiency [%] 90 VOUT = 5.0V 50 40 70 60 50 30 VIN =12V L=4.7µH Cout=44µF 20 10 40 30 0 20 0 1 2 3 0.0 0.5 1.0 ILOAD[A] SW 2.5 3.0 Figure 5. TC vs ILOAD (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF) VOUT (AC) [20mV/div] SW [5V/div] T - Time - 1µsec/div [20mV/div] [5V/div] T - Time - 1µsec/div Figure 7. Output Ripple Voltage (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=3A) Figure 6. Output Ripple Voltage (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=0A) www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 2.0 ILOAD[A] Figure 4. Efficiency (VIN=12V, L=4.7µH (VOUT =3.3/5.0V), Cout=44µF) VOUT (AC) 1.5 5/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB 3.40 3.40 3.38 3.38 3.36 3.36 3.34 3.34 3.32 3.32 Vout [V] Vout [V] Typical Performance Curves (Continued) 3.30 3.28 3.30 3.28 3.26 3.26 3.24 3.24 3.22 3.22 3.20 3.20 0.0 0.5 1.0 1.5 2.0 2.5 4 3.0 6 8 ILOAD [A] 10 12 14 16 18 VIN [V] Figure 8. VOUT Load Regulation (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF) Figure 9. VOUT Line Regulation (VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=0A) 3.40 560 3.38 3.36 3.34 520 Vout [V] Frequency : fOSC [kHz] 540 500 480 3.32 3.30 3.28 3.26 3.24 460 3.22 3.20 440 4 6 8 10 12 14 16 18 -40 VIN [V] 0 20 40 60 80 100 Ta [℃ ] Figure 10. Switching Frequency (VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=0A) www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 -20 Figure 11. VOUT vs Temperature (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=0A) 6/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Typical Performance Curves (Continued) EN [5V/div] EN [5V/div] VOUT [2V/div] VOUT [2V/div] SW [10V/div] SW [10V/div] T - Time – 200msec/div T - Time – 1msec/div Figure 12. Start-up with EN (VIN=12V, VOUT =3.3V, L=4.7µH, Cout=44µF, Iout=0A) Figure 13. Shutdown Wave Form (VIN=12V, VOUT=3.3V, L=4.7µH, Cout=44µF, Iout=0A) Δ=+105mV Δ=-100mV VOUT (AC) [100mV/div] VOUT [5V/div] SW [20V/div] IL [5A/div] Iout [1A/div] T - Time – 1msec/div T - Time - 200µsec/div Figure 14. Load Transient response (VIN=12V, VOUT=3.3V, L=4.7µH, Cout=44µF, Iout=2A) www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 Figure 15. OCP Function (VIN=12V, VOUT 3.3V, L=4.7µH, Cout=44µF, VOUT is short to GND) 7/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Function Explanations 1. Basic Operations (1) Enable control The IC shutdown can be controlled by the voltage applied to the EN pin. When VEN reaches 2.0 V, the internal circuit is activated and the IC starts up. VEN the EN pin VENH VENL 0 VO Output setting voltage 0 TSS Figure 16. On/Off Switching during Enable Control (2) Protective Functions The protective circuits are intended for prevention of damage caused by unexpected accidents. Do not use them for continuous protective operation. (a) Short Circuit Protection Function (SCP) The short circuit protection block (SCP) compares the FB pin voltage with the internal reference voltage VREF. When the FB pin voltage fall below VSCP（= VREF – 240mV）and with that situation continuing for off latch time, it latches output in off situation. Table 1 Short Circuit Protection Function EN Pin FB Pin ＜VSCP 2.0 V or higher ＞VSCP 0.8 V or lower - Short Circuit Protection Function Enabled Disabled Short Circuit Protection Operation ON OFF OFF Figure 17. Short Circuit Protection function (SCP) timing chart www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 8/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB (b) Under Voltage Lockout Protection (UVLO) The Under Voltage Lockout Protection circuit monitors the VIN pin voltage. The operation enters standby when the VIN pin voltage is 3.8 V (Typ) or lower. The operation starts when the VIN pin voltage is 4.0 V (Typ) or higher. VIN UVLO Release hys UVLO detection 0 Vo Soft Start FB HG LG Normal operation UVLO Normal operation HG : Hi side FET GATE signal LG : Low side FET GATE signal Figure 18. UVLO Timing Chart (c) Thermal Shutdown When the chip temperature exceeds Tj = 175°C (Typ), the DC/DC converter output is stopped. The thermal shutdown circuit is intended for shutting down the IC from thermal runaway in an abnormal state with the temperature exceeding Tjmax = 150C. It is not meant to protect or guarantee the soundness of the application. Do not use the function of this circuit for application protection design. VIN EN SCP delay time Typ:1msec Vout SCP threshold Soft Start Tj TSD release HG LG Normal operation TSD Normal operation TSD TSD release SCP (OFF Latch) Normal operation HG : Hi side FET GATE signal LG : Low side FET GATE signal Figure 19. TSD Timing chart www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 9/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB (d) Over Current Protection The Over Current Protection operates by using the current mode control to limit the current that flows through the top MOSFET at each cycle of the switching frequency. When an abnormal state continues, the output is fixed in a low level. (e) Error detection (off latch) release method BD9C301FJ-LB enters the state of off latch when the protection function operates. To release the off latch state, the VIN pin voltage should be changed to less than UVLO level (=3.8V [Typ] ) or, the EN pin voltage falls below VENL voltage. Application Example Figure 20. Application Circuit (VIN=12V, VOUT=3.3V) Maker Part No Input capacitor(Cin1) 10µF/25V TDK C3225JB1E106K Input capacitor(Cin2) 0.1µF/25V TDK C1608JB1H104K Output capacitor(Cout) 22µF/16V × 2 TDK C3216JB1C226M × 2 Inductor (L) 4.7µH TDK SPM6530-4R7 FB Vo(V) R_UP [kΩ] R_DW [kΩ] 5 4.3 0.82 3.3 7.5 2.4 1.8 15 12 1.5 16 18 1.2(Note1) 10 20 (Note1) 1 5.1 20 (Note 1) VOUT has restriction with VIN. See page 13. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 10/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB PCB Layout Design In the step-down DC/DC converter, a large pulse current flows into two loops. The first loop is the one into which the current flows when the top FET is turned ON. The flow starts from the input capacitor CIN, runs through the FET, inductor L and output capacitor COUT and back to GND of CIN via GND of COUT. The second loop is the one into which the current flows when the bottom FET is turned on. The flow starts from the bottom FET, runs through the inductor L and output capacitor COUT and back to GND of the bottom FET via GND of COUT. Route these two loops as thick and as short as possible to allow noise to be reduced for improved efficiency. It is recommended to connect the input and output capacitors directly to the GND plane. The PCB layout has a great influence on the DC/DC converter in terms of all of the heat generation, noise and efficiency characteristics. VIN MOS FET CIN VOUT L COUT GND Figure 21. Current Loop of Buck Converter Accordingly, design the PCB layout considering the following points. Connect an input capacitor as close as possible to the IC VIN pin on the same plane as the IC. If there is any unused area on the PCB, provide a copper foil plane for the GND node to assist heat dissipation from the IC and the surrounding components. Switching nodes such as SW are susceptible to noise due to AC coupling with other nodes. Route the coil pattern as thick and as short as possible. Provide lines connected to FB and COMP far from the SW nodes. Place the output capacitor away from the input capacitor in order to avoid the effect of harmonic noise from the input. Vout SW L IC GND VIN Top layer Mid layer1 Mid layer2 Bottom layer Figure 22. Example of evaluation board layout www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 11/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Selection of Components Externally Connected 1. Output LC Filter Constant The DC/DC converter requires an LC filter for smoothing the output voltage in order to supply a continuous current to the load. Selecting an inductor with a large inductance causes the ripple current ∆IL that flows into the inductor to be small. However, decreasing the ripple voltage generated in the output is not advantageous in terms of the load transient response characteristic. An inductor with a small inductance improves the transient response characteristic but causes the inductor ripple current to be large which increases the ripple voltage in the output voltage, showing a trade-off relationship. It is recommended to select an inductance such that the size of the ripple current component of the coil will be 20% to 40% of the average output current (average inductor current). VIN IL Inductor saturation current > IOUTMAX +⊿IL /2 ⊿IL IOUTMAX L Driver VOUT COUT Average inductor current t Figure 23. Waveform of current through inductor Figure 24. Output LC filter circuit With VIN = 12 V, VOUT = 3.3 V and the switching frequency FOSC = 500 kHz, the calculation is shown in the following equation. Coil ripple current ⊿IL = 30% x Average output current (3 A) = 0.9 [A] 1 L V OUT V IN ‐ V OUT V IN FOSC ⊿ IL 5.31μ ≒4.7μ [H] where : FOSC is a switching frequency The saturation current of the inductor must be larger than the sum of the maximum output current and 1/2 of the inductor ripple current ∆IL. The output capacitor COUT affects the output ripple voltage characteristics. The output capacitor COUT must satisfy the required ripple voltage characteristics. The output ripple voltage can be represented by the following equation. ⊿V RPL ⊿I L R ESR 8 1 C OUT FOSC [V] where : R ESR is the Equivalent Series Resistance (ESR) of the output capacitor. Also this IC provides 1msec[Typ] soft start function to reduce sudden current which flows in output capacitor when startup. But when capacity value of output capacitor COUT becomes bigger than the following method, correct soft start waveform may not appear in some cases. ( ex. VOUT over shoot at soft start .) Select output capacitor COUT fulfilling the following condition including scattering and margin. C OUT I OCP 3.5A min TSS VOUT 0.5ms min [F] where : I OCP is switch current restricted value TSS is soft start time Caution) Concerning COUT total the capacity value of every part connected to Output line. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 12/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB 2. Output Voltage Setting The output voltage value can be set by the feedback resistance ratio. V OUT R 2 R1 0.8 [V] R2 VOUT has restriction with VIN by the following equation. VOUTMin : VIN × 0.125 ≥ 0.8V VOUTMax : VIN × 0.7 Figure 25. Feedback Resistor Circuit 3. Phase Compensation Component A current mode control buck DC/DC converter is a two-pole, one-zero system. Two poles are formed by an error amplifier and load and the one zero point is added by phase compensation. The phase compensation resistor RCMP determines the crossover frequency FCRS where the total loop gain of the DC/DC converter is 0 dB. A high value crossover frequency FCRS provides a good load transient response characteristic but inferior stability. Conversely, a low value crossover frequency FCRS greatly stabilizes the characteristics but the load transient response characteristic is impaired. Here, select the constant so that the crossover frequency FCRS will be 1/20 of the switching frequency. (1) Selection of Phase Compensation Resistor RCMP The Phase Compensation Resistance RCMP can be determined by using the following equation. 2π VOUT FCRS COUT V FB GMP G MA RCMP [Ω] (3-1) where : VOUT is Output Voltage FCRS is Crossover Frequency COUT is Output Capacitance V FB is Feedback Reference Voltage (0.8 V (Typ)) G MP is Current Sense Gain (7.8 A/V (Typ)) G MA is Error Amplifier Trans conductance (300 μA/V (Typ)) (2) Selection of Phase Compensation Capacitance CCMP The phase compensation capacitance CCMP can be determined by using the following equation. C CMP VOUT C OUT I OUT RCMP [F] (3-2) *When capacity value of CCMP and resistance value of RCMP don’t meet the following method, correct soft start waveform may not appear in some cases. Select CCMP and RCMP fulfilling the following condition including scattering and margin. V CMP RCMP I CMP I CMP T 0.715 I CMP T 1.4 C CMP C CMP [V] [V] (3-3） (3-4) VCMP is COMP Terminal voltage RCMP is resistor connected to COMP Terminal CCMP is capacitor connected to COMP Terminal ICMP is Error Amplifier Source Current (45uA(MIN)) T is SCP delay time(500µsec(MIN) ) www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 13/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB (3) Loop Stability To ensure the stability of the DC/DC converter, make sure that a sufficient phase margin is provided. A phase margin of at least 45º in the worst conditions is recommended. A (a) Gain [dB] GBW(b) 0 Phase[deg] －90 f FCR S 0 －90° PHASE MARGIN －180° －180 f Figure 26. Phase Compensation Circuit Figure 27. Bode Plot I/O Equivalent Circuit Diagram 4.FB 5.COMP VIN FB 20kΩ 10kΩ 10kΩ AGND 6.EN 7,8.SW VIN EN 250kΩ 725kΩ AGND Figure 28. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 14/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB 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. 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 © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 15/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB 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 This monolithic IC contains P+ isolation and P substrate layers between adjacent elements in order to keep them isolated. P-N junctions are formed at the intersection of the P layers with the N layers of other elements, creating a parasitic diode or transistor. For example (refer to figure below): When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode. When GND > Pin B, the P-N junction operates as a parasitic transistor. Parasitic diodes inevitably occur in the structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults, or physical damage. Therefore, conditions that cause these diodes to operate, such as applying a voltage lower than the GND voltage to an input pin (and thus to the P substrate) should be avoided. Figure 29. Example of monolithic IC structure 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. Area of Safe Operation (ASO) Operate the IC such that the output voltage, output current, and power dissipation are all within the Area of Safe Operation (ASO). 15. 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. 16. Over Current Protection Circuit (OCP) This IC incorporates an integrated overcurrent protection circuit that is activated when the load is shorted. This protection circuit is effective in preventing damage due to sudden and unexpected incidents. However, the IC should not be used in applications characterized by continuous operation or transitioning of the protection circuit. www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 16/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Power Dissipation When designing the PCB layout and peripheral circuitry, sufficient consideration must be given to ensure that the power dissipation is within the allowable dissipation curve. SOP-J8 Package θj-a=185.2°C /W 1 layer board （back side copper foil area:70mm×70mm） Ordering Information B D 9 C 3 0 1 D J - Package FJ: SOP-J8 Part Number B F 9 C 3 Part Number 0 1 F J Package FJ: SOP-J8 LBH2 Product class LB: for Industrial applications Packaging and forming specification H2: Embossed tape and 18cm reel (Quantity : 250pcs) - LBE2 Product class LB: for Industrial applications Packaging and forming specification E2: Embossed tape and 32.8cm reel (Quantity : 2500pcs) Marking Diagram (TOP VIEW) SOP-J8(TOP VIEW) Part Number Marking 9 C 3 0 1 LOT Number 1PIN MARK www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 17/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Physical Dimension, Tape and Reel Information Package Name www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 SOP-J8 18/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Datasheet BD9C301FJ-LB Revision History Date Draft Changes 9.SEP.2013 001 New Release 8.OCT.2014 002 Expression change Output Voltage Setting Add H2 rank of “Packaging and forming specification” www.rohm.com © 2013 ROHM Co., Ltd. All rights reserved. TSZ22111・15・001 19/19 TSZ02201-0J3J0AJ00540-1-2 8.OCT.2014 Rev.002 Notice Precaution on using ROHM Products 1. (Note 1) If you intend to use our Products in devices requiring extremely high reliability (such as medical equipment , aircraft/spacecraft, nuclear power controllers, 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 not designed 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. 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-SS © 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-SS © 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