1/4 STRUCTURE Silicon Monolithic Integrated Circuit PRODUCT NAME 1ch DC／DC Converter IC built in synchronous rectifier TYPE BD9123MUV FEATURES ・Output Voltage：3 bit Adjustable Setting (0.85~1.2V) ・Output Current：1.2A ・High Efficiency and Fast Transient Response ○ABSOLUTE MAXIMUM RATING (Ta=25℃) Parameter Power Supply Voltage EN, SW, ITH Voltage Symbol Limit VCC -0.3～+7 * 1 Unit V PVCC -0.3～+7 * 1 V EN, SW, ITH -0.3～+7 V Logic Input Voltage VID<2:0> -0.3～+7 V Power Dissipation 1 Pd1 0.27 * 2 W Power Dissipation 2 Pd2 0.62 * 3 W Power Dissipation 3 Pd3 1.77 * 4 W Power Dissipation 4 Pd4 2.66 * 5 W Operating Temperature Range Topr -40～+95 ℃ Storage Temperature Range Tstg -55～+150 ℃ Tjmax +150 ℃ Maximum Junction Temperature 1 * Pd, ASO, and Tjmax=150℃ should not be exceeded. 2 * IC only. 3 2 * 1 layer, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (Copper foil area : 6.28mm ) 4 2 * 4 layers, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (Copper foil area in 1,4layer : 6.28mm , 2 Copper foil area in 2,3layer : 5505 mm ) 5 2 * 4 layers, mounted on a board 74.2mm×74.2mm×1.6mm Glass-epoxy PCB (Copper foil area : 5505mm ) , copper foil in each layers. ○OPERATING CONDITIONS (Ta=-40～+95℃) Parameter Vcc Voltage PVcc Voltage EN Voltage Logic Input Voltage Output Voltage range SW Average Output Current Symbol Min. Typ. Max. Unit VCC 2.7 3.3 5.5 V PVCC 2.7 3.3 5.5 V EN 0 - VCC V VID<2:0> 0 - 5.5 V VOUT 0.85 - 1.2 ISW - - 1.2* V 6 A 6 * Pd and ASO should not be exceeded. This product is not designed for protection against radioactive rays. Status of this document The Japanese version of this document is the formal specification. A customer may use this translation version only for a reference to help reading the formal version. If there are any differences in translation version of this document, formal version takes priority. REV. B 2/4 ○ELECTRICAL CHARACTERISTICS (Unless otherwise specified, Ta=25℃, VCC=PVCC=5V, EN=VCC, VID<2>=VID<1>=VID<0>= 0V) Parameter Symbol Limit Typ. Min. Unit Max. Standby Current ISTB - 0 10 μA Bias Current ICC - 300 500 μA Condition EN=GND EN Low Voltage VENL - GND 0.8 V Standby mode EN High Voltage VENH 2.0 Vcc - V Active mode EN Input Current IEN - 5 10 μA VEN=5V VID Low Voltage VVIDL - GND 0.8 V VID High Voltage VVIDH 2.0 Vcc - V VID Input Current Oscillation Frequency IVID - 5 10 μA FOSC 0.8 1 1.2 MHz VVID=5V Pch FET ON Resistance RONP - 0.35 0.60 Ω PVcc=5V Nch FET ON Resistance RONN - 0.25 0.50 Ω PVcc=5V Output Voltage VOUT 0.98 1.0 1.02 V VID<2:0>=(0,0,0) setting ITH SINK Current ITHSI 25 50 - μA VOUT=1.2V ITH Source Current ITHSO 25 50 - μA VOUT=0.8V UVLO Threshold Voltage VUVLO1 2.4 2.5 2.6 V Vcc=5V→0V UVLO Release Voltage VUVLO2 2.425 2.55 2.7 V Vcc=0V→5V Power Good Threshold VPGOOD1 70 75 80 % VOUT→0V Power Good Release VPGOOD2 85 90 95 % 0V→VOUT TPG 2.5 5 10 ms RONPG - 140 280 Ω TSS 0.4 0.8 1.6 ms TLATCH 1 2 4 ms VSCP - Power Good Delay Power Good ON Resistance Soft Start Time Timer Latch Time Output Short Circuit Threshold Voltage ○PHYSICAL DIMENSION EN Lot No. 1.0MAX SLOPE VOUT 2 Driver Logic 3 PVCC 1 SW 4.7μH PGND 4 5 TSD PGOOD 6 GND 9 0.25 + UVLO 7 PGOOD CLK VCC Soft Start 16 S OSC 9 Input 10μF 15 Current Sense/ Protect R Q + 8 12 0.75 SELECTOR Gm Amp + 0.02 +− 0.03 0.02 (0.22) 13 Current Comp VID<2> 10 VCC 1.4 ± 0.1 0.4 ± 0.1 1.4 ± 0.1 0.5 1 4 100Ω VID<0> 12 VID<1> 11 S 5 14 VREF 1PIN MARK 0.08 S 13 Vcc 0.1μF 3.0 ± 0.1 9 1 16 VOUT→0V VCC 2 3 C0.2 V ○BLOCK DIAGRAM・APPLICATION CIRCUIT 3.0 ± 0.1 D VOUT×0.5 VOUT×0.7 8 + 0.05 − 0.04 ITH RITH VQFN016V3030 (Unit:mm) CITH REV. B Output 10μF 3/4 ○Pin Layout VID<0> VID<1> VID<2> VOUT 12 11 10 9 EN 13 8 ITH VCC 14 7 PGOOD PVCC 15 6 GND PVCC 16 5 PGND 1 2 3 4 SW SW SW PGND Pin No. 1 2 3 4 5 6 7 Pin name 8 ITH 9 10 11 12 13 14 15 16 VOUT VID<2> VID<1> VID<0> EN VCC SW PGND GND PGOOD PVCC Top View ○Output Voltage Setting Table VID<2> VID<1> VID<0> VOUT 0 0 0 1.0V 0 0 1 0.85V 0 1 0 0.9V 0 1 1 0.95V 1 0 0 1.05V 1 0 1 1.1V 1 1 0 1.15V 1 1 1 1.2V *VOUT change starts after 10μs pass from the bit change. *The time of 1step for VOUT (50mV shift) takes 5μs (max). *The time that output voltage reaches the setting value, tVID (max) is 0.06ms. REV. B Function Pch/Nch FET Drain Output Pin Nch FET Source Pin GND pin Power Good Pin Gm Amp output/ Phase compensation filter connected pin Output Voltage Setting Pin Output Voltage Setting Pin <2> Output Voltage Setting Pin <1> Output Voltage Setting Pin <0> Enable Pin (High active) Vcc Power Supply Input Pin Pch FET Source Pin 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. 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, 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 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 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. 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) 0.15Ω 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 0.15Ω, be careful to ensure adequate margins for variation between external devices and this IC, including transient as well as static characteristics. REV. 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