1/5 STRUCTURE PRODUCT NAME ： ： Silicon Monolithic Integrated Circuit DC/DC converter IC for camera module for car navigation system MODEL NAME ： BD8674KN PACKAGE OUTLINE BLOCK DIAGRAM ◎FEATURES： ： ： Fig. - 1 Fig. - 2 ・+3.3V output Step down DC/DC converter for synchronous rectification system ・Double booster charger pump ・+5V output LDO ・Soft start function ・Building in low voltage and over voltage protection function ・Building in terminal RT OPEN/Short protection ・The frequency can be set by external resistance ・Concentrated protection control with built-in sequencer ・Building in external reset output function ・VQFN-28 package ◎ABSOLUTE MAXIMUM RATING:（Ta=25℃） Parameter VIN supply voltage PVIN supply voltage Power dissipation Operating temperature Storage temperature Symbol Limits Unit VIN PVIN Pd Topr Tstg 18V VIN 0.725* ～ ～ V V W ℃ ℃ -40 -55 +85 +150 * 70mm×70mm, thickness1.6mm, less than 3% share of copper foil when implementing glass epoxy board. Operating at higher than Ta=25℃, 5.8mW shall be reduced per 1 ◎OPERATION CONDITION Parameter (Please set the power-supply voltage in consideration of a power dissipation.) Symbol VIN supply voltage VIN This product is not designed for protection against radioactive rays. MIN TYP MAX Unit 4.5 6.0 9.0 V REV. C 2/5 ◎ELECTRICAL CHARACTERISTICS (Unless otherwise noted Ta=25℃, VIN=6.0V,PVIN=6.0V,V33IN=3.3V,V66IN=6.6V,GND=0V) Parameter VIN,PVIN Circuit current 1 VIN,PVIN Circuit current 2 specification value Symbol MIN TYP MAX Condition UNIT IQ1 IQ2 - ‐ 50 μA - 15 - mA V033 IV33B RV33DIS VFC33H VFC33L IFC33SINK 3.234 3.300 3.366 V - 14 - μA - 325 - Ω 1.2 - - V VV33=2.9V - - 0.2 V VV33=3.7V 0.5 - - mA VV33=3.7V、VFC33=0.4V IFC33SOURCE FOSC ISS33 VSS33TH VSS33CLM VSS33STB - - -14 μA VV33=2.9V、VFC33=1.4V 500 - 1200 kHz -4.0 -2.5 -1.0 μA 1.0 1.1 1.2 V EN1,2=0V EN1,2=VIN <Step-down DC/DC converter of 3.3V output part> 3.3V output voltage Terminal V33 Input bias current Terminal V33 Discharge resistance Terminal FC33 Clamping voltage H Terminal FC33 Clamping voltage L Terminal FC33 Sink current Terminal FC33 Source current Range of oscillation frequency setting Terminal SS Charging current Terminal SS Threshold voltage Terminal SS Clamping voltage Terminal SS Standby voltage Terminal SS Standby voltage Maximum hysteresis error Terminal SS Discharge resistance Terminal SS Protection circuit start voltage Terminal SS Protection circuit start voltage Maximum hysteresis error Terminal V33 Low voltage detection voltage Terminal V33 Low voltage detection Maximum hysteresis error Terminal V33 Overvoltage detection voltage 1.6 1.9 2.2 V 0.11 0.15 0.19 V 5 50 100 mV VV33=3.3V VSS33=1.0V VSS33voltage、VV33=0.8V VSS33 voltage (L→H) VSS33STB_HYS RSS33DIS VSS33PON 49 70 91 kΩ 1.0 1.1 1.2 V VSS33PON_HYS 10 100 200 mV VV33LVP 1.11 1.32 1.53 V VV33LVP_HYS 41.2 412 824 mV VV33 voltage VV33OVP 4.45 4.95 5.45 V VV33 voltage VV33IN FCP_OSC VV5 VV5Line VV5Load VV66STB VV66OVP VV5PON VV5LVP - 4 - mA VV33IN=3.3V - 640 - kHz 4.900 5.000 5.100 V - - 50 mV - - 50 mV VSS33 voltage (L→H) VSS33 voltage VV33 voltage (H→L) < Charge pump and 5V output LDO part > Terminal V33IN inflow current Frequency of charge pump SW Terminal V5 Output voltage Line regulation Load regulation Terminal V66 Standby voltage Terminal V66 Overvoltage detection voltage Terminal V5 Protection circuit start voltage Terminal V5 Low voltage detection voltage Terminal V5 Low voltage detection Maximum hysteresis error Terminal V5 Overvoltage detection voltage 4.5 5.0 5.5 V 8.91 9.9 10.89 V 6V～7V 1mA～20mA VV66 voltage(L→H) VV66 voltage VV5 voltage VV5 voltage (H→L) 3.6 4.0 4.4 V 1.68 2.0 2.32 V VV5LVP_HYS 62.5 313 1250 mV VV5 voltage VV5OVP 6.75 7.5 8.25 V VV5 voltage VRSTO VRSTDLYTH VOL_RST 2.723 2.750 2.776 V 0.8 0.9 1.0 V - - 0.5 V VV33 voltage (H→L) VV33=3.3V IOL=4mA VIH_EN VIL_EN II_EN 2.0 - VIN V - - 0.5 V - 36 54 μA < Reset part > Terminal V33 Reset detection voltage Terminal RSTDLY Sresshold voltage Terminal RESET Low output voltage < Other > Terminal EN Input voltage high level voltage Terminal EN Input voltage Low level voltage Terminal EN Input current ●VV33 ： V33 voltage、VFC33 ： FC33 voltage、VSS33： SS voltage、VV66IN ： V66IN voltage、 VV5： V5 voltage、 VV33IN ： V33IN voltage ●This product is not designed for protection against radioactive rays. ●The current ability must not exceed Pd. REV. C Terminal EN1,2 Terminal EN1,2 Terminal EN1,2、EN=VIN 3/5 ◎PIN ASSIGNMENT No. Symbol Description No. Symbol Description 1 FB5 5V output voltage detection terminal 15 GND GND(0V connection) 2 V5 5V regulator output terminal 16 SS33 3.3V soft start adjustment capacity connection terminal 3 V66IN LDO6.6V voltage input terminal 17 RT Frequency adjustment resistance connection terminal 4 V66 Charge pump voltage output terminal 18 RSTDLY 5 CP Capacity connection terminal for charge pump (＋) 19 RSTO Reset output terminal 6 CM Capacity connection terminal for charge pump (－) 20 VIN Power supply input terminal 7 V33IN Charge pump 3.3V input voltage terminal 21 TEST4 Test terminal 4 8 PGND Power GND (the same potential as terminal GND) 22 TEST3 Test terminal 3 Reset Delay adjustment capacity connection terminal 9 SW Coil connection terminal 23 TEST2 Test terminal 2 10 PVIN Power supply input terminal for PowerTr (=VIN) 24 GND GND(0V connection) 11 TEST5 Test terminal 5 25 EN2 5V output control terminal 12 V33 3.3V output voltage detection terminal 26 EN１ 3.3V output control terminal 13 FB33 Error amplifier input terminal 27 SS5 5V soft start adjustment capacity connection terminal 14 FC33 Error amplifier output terminal 28 TEST1 Test terminal 1 ◎PACKAGE OUTLINE Product name BD8674 Lot.No 1pin mark VQFN-28 (UNIT:mm) PACKAGE OUTLINE –fig.1 REV. C 4/5 ◎BLOCK DIAGRAM 10uF 4.5V-9V Ｖ33 FC33 VIN PＶＩＮ FB33 Pre Dri ve 10uH 3.3V 250mA ＳＷ 10uF ＳＳ33 6800pF ＯＶＰ ＬＶＰ ＰＧＮＤ ＲＴ ＯＳＣ Ｖ33ＩＮ 27kΩ TEST1 TEST2 Charge Pump ＳＥＱ Ｃｏｎｔｒｏｌ TEST3 10uF ＣＭ 0.1uF ＣＰ TEST4 V66 V66IN EN1 1uF EN2 Ｖ5 Ｒｅｓｅｔ 5V 0.47uF 30mA FB5 ＯＶＰ ＬＶＰ RSTDLY RSTO TEST5 SS5 ＧＮＤ 15,24 1000pF BLOCK DIAGRAM and recommended external parts constant –fig.2 ＊TEST1,2,3,4 terminal should be connected. ＊PVIN and VIN terminal should be connected each other. ＊Phase compensation circuit of switching regulator is in clunded on this IC. But if switching regulator is used with unrecommeded external parts or under unrecommeded condition, external phase compensation is needed. REV. C 5/5 ◎NOTE ON USE 1．About the absolute maximum rating Attention is brushed off enough to the quality control, it is likely to destroy when the absolute maximum rating such as impressed voltages (VCC_IN,DCIN) and ranges (Topr) of the operating temperature as it is exceeded, the mode of breakings of the short or the opening, etc. cannot be specified, and examine it in this IC to give physical measures for safety such as fuses when a special mode that exceeds the absolute maximum rating is assumed. 2．About the reverse-connection of the power supply connector IC might destroy it by reversely connecting the power supply connector. Give measures such as putting the diode between power supply terminals of power supply and IC outside for the reverse-touching destruction protection. 3．Power supply line Please do measures such as putting the bypass capacitor in power supply-GND nearest pin of this IC as the route of the resurrection current to cause the return of the current in which it resurrected it by the counter electromotive force of the coil. Please confirm the characteristic of the electrolytic capacitor enough as the capacity omission etc. at the low temperature never happen, and decide it. 4．About grand potential Any state of operation must become the lowest potential about the potential of the terminal GND. Moreover, confirm whether there is terminal that is actually the voltage of GND or less including transients. 5．About the heat design Think about permissible loss (Pd) in an actual state of use, and do the heat design with the margin enough. 6．About the short and the miss-installation between terminals Note the direction and the miss-registration of IC enough when you install it in the set substrate. IC might destroy it as well as reversely connecting the power supply connector when installing it by mistake. Moreover, there is fear of destruction when the foreign body enters between terminals, the terminal, the power supply, and grandeur and it is short-circuited. 7．About operation in strong electromagnetic field In use in strong electromagnetic field, note that there is a possibility of malfunctioning. 8．About the capacitor during output-GND The current charged the capacitor with when VCC is 0V or is GND and is short-circuited when a big capacitor is connected between GND output by some factors flows into the output and it is likely to destroy it. Give the capacitor between GND output to 0.1μF or less. 9．About the inspection by the set substrate It is likely to suffer stress to IC and discharge electricity every one process when you connect the capacitor with the pin with low impedance when inspecting it in the set substrate. Moreover, detach it after connecting after the power supply is turned off without fail when detaching it to G in the inspection process, inspecting, and turning off the power supply. n addition, be give the earth to the assembly process as a static electricity measures, and careful enough when it transports and you preserve it. 10．About each input terminal + This IC is a monolithic IC which has a P isolations and P substrate to isolate elements each other. This P layer and an N layer in each element form a PN junction to construct various parasitic elements. For instance, the potential difference operates in resistance as shown in the figure below when resistance and the transistor connect it with the terminal and the playground (GND) >(terminal B) joint of PN operates as a parasitic diode in playground (GND) >(terminal A) transistor (NPN). In addition, the NPN transistor of parasitism works with N layer of the element of the above-mentioned parasitic diode and the neighborhood and others in transistor (NPN). A parasitic element in IC composition is inevitably formed because of the potential relation. A parasitic element can operate, the interference with the circuit operation be caused, it malfunction, and, consequently, it cause destruction. Therefore, do not do the usage that a parasitic element operates as a voltage that is lower than the playground (GND;P substrate) is impressed to the input terminal enough. Moreover, do not impress the voltage to the input terminal when you do not impress the power-supply voltage to IC. Give each input terminal to me the voltage below the power-supply voltage or in the guarantee value of an electric characteristic when you similarly impress the power-supply voltage. Example of IC of simple structure 11．Earth wiring pattern If small signal GND and large current GND exist, disperse their pattern. In addition, for voltage change by pattern wiring impedance and large current not to change voltage of small signal GND, 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. 12．Thermal Shut-Down When a thermal shutdown operates, the DC/DC converter controller of all Ch is turned off. When a thermal shutdown is released, the DC/DC converter controller of all Ch becomes an operation beginning from turning off. 13. Bypass Capacitor of Power Supply When PVIN, VIN voltages go down as ENI=HIGH in the state of high impedance with a capacitor in the large effect of the dielectric substance absorption such as the aluminum electric field capacitor installed in PVIN and VIN; PVIN, VIN voltages go up by dielectric substance absorption again, and V33 output voltage goes up. 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. 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. 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