1/3 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT NAME 1ch DC／DC PWM Converter IC built in synchronous rectifier TYPE BD89630EFJ FEATURES ・Output Voltage：Adjustable(1.0～2.5Ｖ), Output Current：2.0A ・High Efficiency and Fast Transient Response ○ABSOLUTE MAXIMUM RATING（Ta=25℃） Symbol Limit Power Supply Voltage Parameter VCC -0.3～+7 * EN Voltage VEN -0.3～+7 V SW・COMP Voltage VSW, VCOMP -0.3～+7 V Power Dissipation 1 Pd1 0.5 * Power Dissipation 2 Pd2 3.76 * Operating Temperature Range Topr -25～+85 Storage Temperature Range Tstg -55～+150 ℃ Tjmax +150 ℃ Maximum Junction Temperature Unit 1 V 2 W 3 W ℃ 1 * Pd, ASO and Tjmax=150℃ should not be exceeded. 2 * Reduced by 4.0mW for increase in Ta of 1℃ above 25℃. 3 * Reduced by 30.0mW for increase in Ta of 1℃ above 25℃. (when mounted on a board 70.0mm × 70.0mm × 1.6mm Glass-epoxy PCB) ○OPERATING CONDITIONS（Ta=-25～+85℃） Symbol Min. Typ. Max. Power Supply Voltage VCC 2.7 5.0 5.5 V EN Voltage VEN 0 - Vcc V VOUT 1.0 - 2.5* 4 V ISW - - 2.0* 5 A Parameter Output Voltage range SW Average Output Current 4 * In case set output voltage 1.6V or more, VccMin. = Vout +1.8V 5 * Pd should not be exceeded. ★This product is not designed for protection against radioactive rays. REV. B Unit 2/3 ○ELECTRICAL CHARACTERISTICS (Unless otherwise specified , Ta=25℃ VCC=5V, EN=VCC, R1=30kΩ, R2=7.5kΩ) Parameter Symbol Limit Typ. Min. Unit Max. Standby Current ISTB - 5 20 μA Bias Current ICC - 350 600 μA Condition EN=GND EN Low Voltage VENL - GND 0.3 V EN High Voltage VENH 2.0 VCC - V IEN - 1.25 10 μA Oscillation Frequency FOSC 0.8 1 1.2 MHz Pch FET ON Resistance RONP - 145 290 mΩ VCC=5V Nch FET ON Resistance RONN - 80 160 mΩ VCC=5V ADJ Reference Voltage VADJ 0.788 0.800 0.812 V EN Current Stand-by Mode Active Mode VEN=5V COMP SINK Current ICOSI 10 25 - μA VADJ=1.0V COMP Source Current ICOSO 10 25 - μA VADJ=0.6V UVLO Threshold Voltage VUVLO1 2.400 2.500 2.600 V Vcc=5V→0V UVLO Hysteresis Voltage VUVLO2 2.425 2.550 2.700 V Vcc=0V→5V TSS 0.5 1 2 ms TLATCH 1 2 4 ms VSCP - Soft Start Time Timer Latch Time Output Short circuit Threshold Voltage ○PHYSICAL DIMENSION VOUT×0.5 VOUT×0.7 V VOUT=1.0V→0V ○BLOCK DIAGRAM・APPLICATION CIRCUIT VCC EN 3 VCC VREF D89630 Current Comp Lot No. + R Q S SLOPE CLK OSC VCC Gm Amp + 4 + 5 Driver Logic 6 GND TSD 2 SCP 8 ADJ 1 COMP HTSOP-J8 (unit:mm) ○ SETTING THE OUTPUT VOLTAGE ○PIN No., PIN NAME L 6 Vout SW R2 8 ADJ R1 The Output Voltage is set by the external resistor divider and is calculated as： Vout=(R2/R1+1)×VADJ ・・・ ① VADJ：ADJ pin reference Voltage (0.8V typ) It’ s possible to adjust the output voltage by R1 and R2. (The Vout must be set from 1.0V to 2.5V.) Resistance R1≒10kΩ is recommended. Please confirm the ripple voltage, if you can use the resistance more than 100kΩ. REV. B Output SW UVLO Soft Start PIN No. 1 2 3 4 5 6 7 8 Input Current Sense/ Protect PIN Name COMP GND EN VCC SW SW N.C ADJ 3/3 ○NOTES FOR USE (1) Absolute Maximum Ratings We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such as impressed voltages or the operating temperature range, is exceeded, and whether the destruction is short circuit mode or open circuit mode cannot be specified. Pleases take into consideration the physical countermeasures for safety, such as fusing, if a particular mode that exceeds the absolute maximum rating is assumed. (2) GND Potential Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage except for SW, GND terminals including an actual electric transient. (3) Thermal design Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and please design enough temperature margins. (4) Short circuit mode between terminals and wrong mounting In order to mount the IC on a set PCB, pay thorough attention to the direction and offset of the ICs. Erroneous mounting can destroy the IC. 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 IC can destroy (5) Operation in Strong electromagnetic field Be noted that using the IC in the strong electromagnetic radiation can cause operation failures. (6) ASO(Area of Safety Operation.) Do not exceed the maximum ASO and the absolute maximum ratings of the output driver. (7) TSD(Thermal Shut-Down) circuit The thermal shutdown circuit (TSD circuit) is built in this product. When IC chip temperature becomes higher, the thermal shutdown circuit operates and turns output off. The guarantee and protection of IC are not purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that operates the TSD circuit. (8) GND wiring pattern Use separate ground lines for control signals and high current power driver outputs. Because these high current outputs that flows to the wire impedance changes the GND voltage for control signal. Therefore, each ground terminal of IC must be connected at the one point on the set circuit board. As for GND of external parts, it is similar to the above-mentioned. (9) Operation in supply voltage range Functional Circuit operation is guaranteed within operation ambient temperature, as long as it is within operation supply voltage range. The electrical characteristics standard value cannot be guaranteed. However, there is no drastic variation in these values, as long as it is within operation supply voltage range. (10) We are confident in recommending the above application circuit example, but we ask that you carefully check the characteristics of this circuit before using it. If using this circuit after modifying other external circuit constants, be careful to ensure adequate margins for variation between external devices and this IC, including not only static characteristics but also transient characteristics. If switching noise is high, please insert the schottky barrier diodes between SW pin and GND pin. (11) Overcurrent protection circuit The overcurrent protection circuit is built in the output. If the protection circuit operates more than for specific hours (when the load is short.), the output will be latched in OFF. The output returns when EN is turned on or UVLO is released again. These protection circuits are effective in the destruction prevention by broken accident. Please do not use in continuous circuit operation. (12) Selection of inductor It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. Especially, in case output voltage is set 1.6V or more, note that use of a high DCR inductor will cause an inductor loss, resulting in decreased output voltage. Should this condition continue for a specified period (soft start time + timer latch time), output short circuit protection will be activated and output will be latched OFF. When using an inductor over 0.1Ω, be careful to ensure adequate margins for variation between external devices and this IC, including transient as well as static characteristics. Furthermore, in any case, please start up the output with EN after supply voltage is within operation range(2.7～5.5V). REV. B Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. The content specified herein is subject to change for improvement without notice. The content specified herein is for the purpose of introducing ROHM's products (hereinafter "Products"). If you wish to use any such Product, please be sure to refer to the specifications, which can be obtained from ROHM upon request. Examples of application circuits, circuit constants and any other information contained herein illustrate the standard usage and operations of the Products. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. 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