1/4 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT NAME 1ch DC / DC Converter with synchronous rectifier TYPE BD9142MUV FEATURES ・Output Voltage：1.0～3.3V / Adjustable ・Output Current：3A ・High Efficiency and Fast Transient Response ・Dynamic Input Switching ○ABSOLUTE MAXIMUM RATING（Ta=25℃） Parameter Supply Voltage BST Voltage BST-SW Voltage EN, SW, ITH, DET VREG, CTL, ADJ Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Maximum Junction Temperature Symbol Limit QVCC PVCC AVCC VBST VBST-SW VEN, VSW, VITH, VDET VVREG, VCTL, VADJ Pd1 Pd2 Pd3 Pd4 Topr Tstg Tjmax Unit -0.3～+7 * 1 V -0.3～+14 -0.3～+7 V V -0.3～+7 V 2 0.34 * 3 0.69 * 4 2.20 * 5 3.56 * -40～+85 -55～+150 +150 W W W W ℃ ℃ ℃ *1 Pd and Tj=150℃ should not be exceeded. *2 IC only. *3 1 layer, mounted on a board 74.2mm×74.2mm×1.6mmt Glass-epoxy PCB (Copper foil area : 10.29mm2) *4 4 layers, mounted on a board 74.2mm×74.2mm×1.6mmt Glass-epoxy PCB (Copper foil area : 10.29mm2) , copper foil in each layers. *5 4 layers, mounted on a board 74.2mm×74.2mm×1.6mmt Glass-epoxy PCB (Copper foil area : 5505mm2) , copper foil in each layers. ○OPERATING CONDITIONS（Ta=-40～+85℃） Parameter Supply Voltage EN Voltage Output Voltage range SW Average Output Current1 (PVCC INPUT) SW Average Output Current2 (QVCC INPUT) Symbol Min. Typ. Max. Unit 4.5 5.0 6.5 V 0 1.0 - QVCC 3.3 V V ISW1 - - 3.0* 6 A ISW2 - - 0.1 QVCC PVCC AVCC VEN VOUT *6 Pd should not be exceeded. REV. A A 2/4 ○ELECTRICAL CHARACTERISTICS （Unless otherwise specified , Ta=25℃, QVCC =5V, EN= QVCC） Parameter Symbol Standby Current Bias Current EN Low Voltage EN High Voltage EN Input Current Oscillation Frequency INPUT FET ON Resistance Highside FET ON Resistance Lowside FET ON Resistance ADJ Reference Voltage ITH SINK Current ITH Source Current UVLO Threshold Voltage UVLO Release Voltage DET Threshold Voltage DET Release Voltage CTL Pch ON Resistance CTL Nch ON Resistance Soft Start Time Timer Latch Time Output Short circuit Threshold Voltage ISTB ICC VENL VENH IEN FOSC RONI RONH RONL VADJ ITHSI ITHSO VUVLO1 VUVLO2 VDETRST VDETST RONPCTL RONNCTL TSS TLATCH VSCP ○PHYSICAL DIMENSION 4.0±0.1 D9142 1.0Max. Lot No. 6 7 24 19 18 0.75 0.5 12 13 2.4±0.1 0.4±0.1 1 0.02 +0.03 -0.02 (0.22) S C0.2 2.4±0.1 Typ. Max. 2.0 0.8 0.788 10 10 3.8 3.85 0.78 0.785 0.5 0.5 - 0 400 GND Vcc 10 1 4.5 130 130 0.800 20 20 4.0 4.1 0.8 0.81 110 110 1 1 0.40 10 600 0.8 20 1.2 7.2 210 210 0.812 4.2 4.4 0.82 0.84 165 165 2 2 0.56 Unit Condition uA uA V V uA MHz Ω mΩ mΩ V uA uA V V V V Ω Ω ms ms V EN=0 Standby Active VEN=5V VADJ=1V VADJ=0.6V QVCC=5→0V QVCC=0→5V PVcc=5V, Id=1mA PVcc=5V, Id=1mA VADJ=0.8→0V ○BLOCK DIAGRAM 4.0±0.1 0.08 S Limit Min. 0.25 +0.05 -0.04 VQFN024V4040 (Unit:mm) Pin No. Pin name 1 SW SW pin Function 2 SW SW pin 3 SW SW pin 4 SW SW pin 5 SW SW pin 6 SW SW pin 7 N.C. 8 PVCC Highside FET drain pin Highside FET drain pin Non Connection 9 PVCC 10 BST 11 QVCC 12 DET Detector pin 13 N.C. Non Connection 14 AVCC 15 N.C. 16 AGND Bootstrapped voltage input pin QVCC power supply input pin AVCC power supply input pin Non Connection Ground 17 EN 18 CTL Enable pin (High Active) External FET control pin 19 ADJ Output voltage detect pin 20 ITH 21 VREG Internal voltage regulator 22 PGND Lowside FET source pin 23 PGND 24 N.C. REV. A GmAmp output pin Lowside FET source pin Non Connection 3/4 ○APPLICATION CIRCUIT1 （Dual Input） CDET VIN1 VIN1 R4 VIN2 M1 R5 DET AVCC QVCC PVCC CIN EN UVLO CTL VREG VREG CVERG CTL DET 0.8V SLOPE BST OSC CBST CONTROL LOGIC TSD 0.8V 0.4V SS ITH Gm M2 SW L RS 3A VOUT2 100mA VOUT1 CO SCP CS RITH CITH ADJ AGND PGND R2 R1 ○APPLICATION CIRCUIT2 （Single Input） VIN VIN AVCC DET QVCC PVCC EN UVLO CTL VREG VREG CTL DET 0.8V SLOPE BST OSC TSD CONTROL LOGIC SW 3A ITH Gm 0.8V 0.4V SS VOUT SCP ADJ AGND PGND ○SETTING THE OUTPUT VOLTAGE L SW ADJ CO R2 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 3.3V.) Resistance R1≒10kΩ is recommended. Please confirm the ripple voltage, if you can use the resistance more than 100kΩor they have a big range between the setting value of output voltage and input voltage. REV. A 4/4 ○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. 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, PGND, 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 enough temperature margins. design (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) 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, do not use this IC after TSD circuit operates, nor use it for assumption that operates the TSD circuit. (7) 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. (8) 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. (9) 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, insert the Low pass filter between Vcc pin and PVcc pin, insert the schottky barrier diodes between SW pin and PGND pin. (10) 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. Do not use in continuous circuit operation. (11) Selection of inductor It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. 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. 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"). 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