1/4 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT NAME Dual output DC / DC Converter IC built in synchronous rectifier, 2 with I C interface BD91362MUV TYPE 2 ・Output Voltage：8bit Adjustable Setting with I C interface (FB1=FB2=0.900～1.075V / 25mV step) ・Output Current：3.0A/1.0A ・High Efficiency and Fast Transient Response 2 ・I C Compatible Interface(Device address '1100011') ○ABSOLUTE MAXIMUM RATING（Ta=25℃） FEATURES Parameter Symbol Limit Unit 1 AVcc Voltage VCC -0.3～+7 * V PVcc Voltage PVCC -0.3～+7 *1 V VDVDD Voltage DVDD -0.3～+7 *1 V VBST -0.3～+13 V VBST-SW -0.3～+7 V VEN -0.3～+7 V SCL・SDA Voltage VSDA ,VSCL -0.3～+7 V Power Dissipation 1 Pd1 0.34 *2 W Power Dissipation 2 Pd2 0.70 *3 W Power Dissipation 3 Pd3 2.21 *4 W Power Dissipation 4 Pd4 3.56 *5 W Operating Temperature Range Topr -40～+105 ℃ Tstg -55～+150 ℃ Tjmax +150 ℃ BST Voltage BST-SW Voltage EN・ SW・ITH Voltage Storage Temperature Range Operating Junction Temperature *1 Pd, ASO, and Tj=150℃ should not be exceeded. *2 IC only. *3 1 layer, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (Copper foil area : 10.29mm2) *4 4 layers, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (1st ,4th Copper foil area :10.29mm2 2nd ,3rd Copper foil area : 5505mm2) *5 4 layers, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (Copper foil area : 5505mm2) , copper foil in each layers. ○OPERATING CONDITIONS（Ta=-40～+105℃） Symbol Min. Typ. Max. Unit VCC 2.7 5.0 5.5 V PVcc Voltage PVCC 2.7 5.0 5.5 V VDVDD Voltage DVDD *6 1.8 2.5 VCC V VEN 0 - VCC V VSDA ,VSCL 0 - DVDD V Output Voltage range*7 VOUT 1.0 - 3.3*8 V SW Average Output Current ISW1 - - 3.0*9 A SW Average Output Current ISW2 - - 1.0*9 A Parameter Vcc Voltage EN Voltage SCL.SDA Voltage 6 * VDVDD < VCC , PVCC *7 Initial set of I2C interfece 8 * In case set output voltage 1.6V or more, VccMin.=VOUT+1.2V. *9 Pd and ASO should not be exceeded. This product is not designed for protection against radioactive rays. REV. C 2/4 ○ELECTRICAL CHARACTERISTICS Parameter （Unless otherwise specified , Ta=25℃ VCC=PVCC=5.0V, DVDD =2.5V, EN=VCC） Symbol Limit Typ. Min. Max. Unit Standby Current ISTB - 0 20 μA Bias Current ICC - 500 800 μA EN Low Voltage VENL - GND 0.8 V EN High Voltage VENH 2.0 Vcc - V EN Input Current IEN - 2 10 μA MHz Oscillation Frequency High-side FET ON Resistance FOSC 0.8 1 1.2 RONH1 - 60 90 mΩ RONH2 - 170 255 mΩ Condition EN=0V Standby Mode Active Mode EN=2V RONL1 - 55 83 mΩ RONL2 - 130 195 mΩ FB Reference Voltage1 FB1 0.985 1.0 1.015 V ±1.5% FB Reference Voltage2 FB2 0.985 1.0 1.015 V ±1.5% ITH sink current 1 ITHSI1 10 18 - μA ITH source current 1 ITHSO1 10 18 - μA VFB1=0.8V ITH sink current 2 ITHSI2 10 18 - μA VFB2=1.2V Low-side FET ON Resistance VFB1=1.2V ITH source current 2 ITHSO2 10 18 - μA VFB2=0.8V UVLO Threshold Voltage VUVLOL 2.4 2.5 2.6 V VCC=5→0V UVLO Release Voltage VUVLOH 2.425 2.55 2.7 V VCC=0→5V TSS 0.5 1 2 ms Timer Latch Time TLATCH 0.5 1 2 ms Output Short circuit Threshold Voltage VSCP1 - 0.5 0.7 V FB1=1.0→0V(initial) VSCP2 - 0.5 0.7 V FB2=1.0→0V(initial) Soft Start Time SCP/TSD ON Digital I/O (SCL,SDA) INPUT Low Voltage VIL - GND 0.2×DVDD V INPUT High Voltage VIH 0.8×DVDD DVDD - V IIN - 0 10 μA VOL - - 0.6 V Inflow current Data Output Low voltage ○PHYSICAL DIMENSION 91362 Lot No. ○PIN No., PIN NAME ○FB Reference voltage PIN No PIN NAME PIN No PIN NAME 1 PVCC1 13 GND 2 BST 14 ITH2 3 SW1 15 FB2 4 SW1 16 ITH1 5 SW1 17 FB1 6 SCL=SDA=2.5V IOL=6mA PGND1 18 VCC 7 PGND1 19 SCL 8 PGND1 20 SDA 9 PGND2 21 DVDD 10 SW2 22 N.C 11 PVCC2 23 PVCC1 12 EN 24 PVCC1 ○SETTING THE OUTPUT VOLTAGE FB1,FB2 0.900 V 0.925 V 0.950 V 0.975 V 1.000 V (initial) 1.025 V 1.050 V 1.075 V *FB1,FB2 change after 10usec(max) pass from setting the voltage by I2C interface *The time of 1step for FB1,FB2(25mV shift) take 5usec(max). *The time that output voltage reaches the setting value is 0.06msec(max). VOUT SW R2 VQFN024V4040 (Unit:mm) ADJ R1 The Output Voltage is set by the external resistor divider and is calculated as： Vout=(R2/R1+1)×VFB ・・・ ① VFB：FB pin feedback Voltage (1.0V typ) It’ s possible to adjust the output voltage by R1 and R2. (The Vout must be set from 1.0V to 3.3V. 2 To control I C BUS,The Vout can be set 0.9～3.475V) Resistance R1≒10kΩ is recommended. Please confirm the ripple voltage, if you can use the resistance more than 100kΩ. REV. C 3/4 ○BLOCK DIAGRAM・APPLICATION CIRCUIT EN VCC ITH1 FB1 BST Current Current Comp Gm Amp Q R Sense/ PVCC1 VIN Protect S Slope1 Soft Start1 DVDD + SW1 Driver Logic VOUT1 PVCC FB1 PGND1 SCP1 DVDD I2C Master SDA CLK1 SELECTOR I2C I/F SCL VREF OSC SCP/ TSD UVLO CLK2 PVCC2 SCP2 Q R Gm Amp FB2 Sense/ Protect S Slope2 Soft Start2 SW2 VOUT2 + Driver CLK2 ITH2 Logic PGND2 GND ○I2C - BUS control map Byte Bit7 Bit6 1 Bit5 Bit 4 Bit 3 Bit 2 Bit 1 DEVICE ADDRESS[6:0] 2 FB1[2:0] 0 Bit 0 R/W FB2[2:0] 0 Byte 1 is DEVICE ADDRESS:[1100011] Byte 2 is DATA BIT, from Bit5 to Bit7 set FB2[2:0] , from Bit1 to Bit3 set FB1[2:0]. Bit0 and Bit4 input ‘0’ . The mode of this IC is WRITE MODE only. REGSEL REGISTER (Write), initial value : 00h REGISTRE R/W REGSEL W Bit [7:5]: Bit7 Bit6 Bit5 FB1[2:0] 0 0 Bit4 0 0 0 FB1[2:0] Set CH1 output voltage “000”： 1.000V(initial) Bit3 Bit2 Bit1 Bit0 FB2[2:0] 0 0 0 0 Bit [3:1]: 0 FB2[2:0] Set CH2 output voltage “000”： 1.000V(initial) “001”： 0.925V “001”： 0.925V “010”： 0.950V “010”： 0.950V “011”： 0.975V “011”： 0.975V “100”： 0.900V “100”： 0.900V “101”： 1.025V “101”： 1.025V “110”： 1.050V “110”： 1.050V “111”： 1.075V “111”： 1.075V REV. C VIN Current Current Comp FB2 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 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, 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, insert the Low pass filter between Vcc pin and PVcc pin, insert the schottky barrier diodes between SW pin and PGND 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. 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. 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. (13) DVDD The operating voltage range for DVDD is 1.8V~3.6V. The IC may not operate normally when the voltage is below than 1.8V. Therefore, a stabile power supply is required to ensure the supply voltage is within the DVDD operating voltage range. When I2C is not been used, DVDD must be shorted to VCC. Please be noticed that the output voltage from this IC can not be supplied to the DVDD. REV. C Notice Notes No copying or reproduction of this document, in part or in whole, is permitted without the consent of ROHM Co.,Ltd. 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