1/4 STRUCTURE Silicon Monolithic Integrated Circuit TYPE Flexible Step-Down Switching Regulator PRODUCT SERIES BD9009HFP FEATURES ・Wide input Range ： 7～35V ・Integrated 4A P-ch Power MOS FET ・High Precision(Reference Voltage) ： ±2% ・Adjustable Frequency ： 50k～500kHz ((it is possible external synchronization until 500kHz)) ・Oscillation frequency accuracy ： ±5% (200～500kHz) ○ABSOLUTE MAXIMUM RATINGS（Ta＝25℃） Parameter Symbol Supply Voltage VIN SW Pin Voltage Vsw Output SW Current Isw EN, SYNC Pin Voltage VEN/SYNC RT, FB, INV Pin Voltage VRT,VFB, VINV Power Dissipation Pd Operating Temperature Range Topr Storage Temperature Range Tstg Maximum Junction Temperature Tjmax Limits 36 VIN 4(1) VIN 7 5.5(2) -40～+105 -55～+150 150 Unit V V A V V W ℃ ℃ ℃ （1）Do not however exceed Pd. （2）Pd derated at 44mW/℃ for temperature above Ta=25℃, Mounted on a double layer PCB 70mm×70mm×1.6mm. (with Thermal vias / Copper area：70mm×70mm) ○OPERATING CONDITIONS（Ta=-40～+105℃） Parameter Symbol Recommend Supply Voltage VIN Output Switch Current ISW Oscillator Frequency FOSC Min. 7 － 50 Max. 35 4 500 ＊Electrical characteristics are not guaranteed (especially when operating on reduce voltage) ＊The product is not designed for protection against radioactive rays. REV. A Unit V A kHz 2/4 ○ELECTRICAL CHARACTERISTICS （Unless otherwise specified, Ta=25℃,VIN=13.2V,VEN=5V） Parameter ［Entire Device］ Stand-by Current Quiescent Current ［Switch］ Leakage Current ［Error Amplifier］ Reference Voltage1 Reference Voltage2 Input Bias Current ［Oscillator Section］ Switching Frequency1 Switching Frequency2 ［Synchronized Frequency］ Synchronous Frequency ［Enable］ Output ON Voltage Output OFF Voltage Sense Current Min. Limits Typ. Max. ISTB IQ － － 0 4.2 10 6.5 μA mA VEN=0V IO=0A,RT=51kΩ,INV=0.7V IoLEAK － 0 30 μA VIN=35V,VEN=0V VREF1 VREF2 IB 0.784 0.780 -1 0.800 0.800 － 0.816 0.820 － V V μA VFB=VINV VIN=10～16V,VFB=VINV VINV=0.6V FOSC1 FOSC2 285 283.5 300 300 315 316.5 kHz kHz VIN=7V,RT=51kΩ VIN=7～16V,RT=51kΩ FSYNC 495 500 505 kHz RT=51kΩ,EN/SYNC=500kHz Duty=50% VENON VENOFF IEN 2.6 － － － － 35 － 0.8 90 V V μA Symbol ○PHYSICAL DIMENTIONS・MARKING BD9009HFP Product Series Lot No. HRP7 (unit : mm) REV. A Unit Condition VEN=5V 3/4 ○BLOCK DIAGRAM VIN １ ７ EN/SYNC ２ SW ４ GND Vref Internal Bias SYNC SOFT START + PWM COMP ERROR AMP INV ５ + + - CURRENT LIMIT SDWN Reset + 0.8V DRV DRIVER Set Slope SDWN UVLO/ TSD OSC FB ３ COUNTER TIMER ６ RT ※Refer to the Technical Note about the details of the application. ○Pin No.・Pin Name Pin No. Pin Name 1 VIN 2 SW 3 FB 4 GND 5 INV 6 RT 7 EN/SYNC FIN FIN REV. A 4/4 NOTES FOR USE 1. Absolute maximum range Absolute Maximum Ratings are those values beyond which the life of a device may be destroyed we cannot be defined the failure mode, such as short mode or open mode. Therefore physical security countermeasure, like fuse, is to be given when a specific mode to be beyond absolute maximum ratings is considered. 2. Operation supply voltage range The circuit functionality is guaranteed within operation of ambient temperature range, as long as it is within operation supply voltage range. The standard electrical characteristic values are guaranteed at the test circuit voltage of VIN=13.2V. They cannot be guaranteed at other voltages in the operating range of 7V-35V. However, the variation will be small. 3. Grounding It is recommended that every capacitor (bypass and another capacitors) is grounded to PIN4 using single-point connections. 4. Input supply voltage Input supply pattern layout should be as short as possible. 5. VIN Terminal For reduce the influence of switching noise, bypass capacitor is connected between VIN and GND.(over 3μF) 6. SOFT START The SOFT START block provides a function to prevent the overshoot of the output voltage Vo through gradually increasing the normal rotation input of the error amplifier when power supply turns ON to gradually increase the switching Duty. The soft start time is set to 5 msec. (Typ.). 7. FB Terminal The FB terminal is for phase margin of the DC/DC system. A capacitor and a resistor or an only capacitor placed between the FB terminal and the INV terminal. The values of the capacitor and the resistor shall be adjusted according to the output current and the output capacitor value. The output may be oscillating if the value of capacitor is not sufficient, also the transient response may become insufficient if the value is too large. Therefore, the value of the capacitor and the resistor shall be adequately set up based on the condition of the temperature, and so on. Since the FB terminal also detects output short condition compulsorily applying an external voltage onto the FB terminal must not be performed because it may activate the timer latch protection circuit. 8. Electromagnetic Fields The IC is susceptible to strong electromagnetic fields and may cause malfunction. Therefore, caution should be used when placing it on the PCB. 9. Application Design When designing the external circuit, included adequate margins, including not only steady state but also transient characteristics. 10. Adjacent Pin short mistake fitting Use caution when orienting and positioning the IC for mounting on printed circuit boards. Improper mounting may result in damage to the IC. When VIN and EN terminal are short and used, please note that the destruction of IC is caused with VIN=7V or more enough, when 7 pin EN terminal and 6 pin RT terminal are short-circuit. 11. Over Output Current Protection SW Output terminal has over current protection circuit of 4A(Minimum load current ability), with prevents IC from being damage by short circuit at over current. When over current protection circuit operates, output is turned off immediately, and then this IC restart to operate after 4096/fosc sec.. However, It is recommend not to use that continuously operates the protection circuit (For instance, always the load that greatly exceeds the output current ability is connected or the output is short-circuited, etc.) in these protection circuits by an effective one to the destruction prevention due to broken accident. 12. Over Output Current Protection at start up This IC is designed that over current protection circuit operates at start up and normal operation. Therefore at start up when this IC’s total load current (sum of load current and charge current to output capacitor) is exceeded 4A(Minimum load current ability), over current protection circuit operates, and this IC’s start up times are excessive time by latch off counter timer(4096/fosc[s]). If this case is occurred, output capacitor is recommended to change small value. 13. Temperature protection (thermal down) circuit This IC has a built-in temperature protection circuit to prevent the thermal destruction of the IC. As described above, be sure to use this IC within the power dissipation range. Should a condition exceeding the power dissipation range continue, the chip temperature Tj will rise to activate the temperature protection circuit, thus turning OFF the output power element. Then, when the tip temperature Tj falls, the circuit will be automatically reset. Furthermore, if the temperature protection circuit is activated under the condition exceeding the Maximum Junction Temperature, do not attempt to use the temperature protection circuit for set design. 14. Output terminal of application circuit short to GND mode When this IC starts up with output-GND short, SW output current is exceeded 4A, and this IC may be destroyed. When VIN input voltage is under 7V with output-GND short, over current protection may don’t operates. Please don’t use this IC in these cases. REV. A Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. 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