Bellnix Power IC BiC1421 <Summary> BIC 1421 is a high efficiency POWER-IC of MCM (multi chip module) with synchronous rectification system chopper control, N channel MOSFET of main switch and low side MOSFET for synchronous rectification. Maximum output is 3A and the input voltage range corresponds to 8V-40V which covers the input voltage of IEEE-1394. The functions such as over-current protection, over-heat protection and ON/OFF control etc. are all put in the surface mount one-package IC, which makes it possible to achieve a small size and light DC-DC converter with very few external components. <Features> - Input voltage range which corresponds to IEEE-1394: (DC8-40V ) - Switchable output voltage: 3.3V/ 5.0V - Maximum output current: 3.0A - Built-in main switch MOSFET and commutation MOSFET - Over-current protection - Over-heat protection - Remote ON/ OFF control - Lead-free correspondence < Applications > - Information distribution equipment - Telecommunications equipment - Office automation equipment - Factory automation equipment (Process control) - Electronic measuring instruments - Audio-Video devices - Home appliances < Designation of product > Model name: BIC 1421 The packaging, only tape and reel is available. Mai itch LOW Sid Synchronous ain Switc ide Rectification MOS-FET MOS-FET control IC ROWERIC _ annnennnnnnnnna ge) + Gime) = | picvaai| TONSOTICEUUEN Input Output 8-40V 3. 3V/5. OV Oo TOMO + ZZ oO This figure is different from actual wiring. 0 Bellnix DC-DC CONVERTERS 1 BDD20050412 .050704Bellnix <Absolute maximum rating (Ta=25C)> Item Line MOS current (AVE) current (PEAK) Remote control Junction Ss <Electrical charateristics (Ta=25C)> 42 42 3 4 5.5 -40 to 150 150 Power IC BiC1421 Item Symbol Conditions MIN TYP MAX Unit HighsideMOS _ = _ _ Drain-source breakdown voltage Vass Id= 1mA,Vgs=0V 42 V _ HighsideMOS Idss Vds =40V,Vgs=0V ~ si 10 yA Drain interruption current Highside MOS _ = _ Drain-source ON resistance Ron Id=1.2A,Vgs=4.5V 33 70 me HighsideMOS _ _ _ =e Source-drain Di forward voltage Vsd Is=1.2A,Vgs=0V 18 V LowSideMOS _ = _ _ Drain-source breakdown voltage Vass d= tmA.Vgs= OV 42 V _ LowSideMOS Idss Vds=40V,Vgs=0V - _ 10 LA Drain interruption current LowSideMOS _ = = Drain-source ON resistance Ron Id=1.2A,Vgs=4.5V 33 #0 mo LowSideMOS _ _ _ _ Source-drain breakdown voltage Vsd Is=1.2A,Vgs=0V 18 V Start voltage Vcc_start oe 7 7.5 8 V Stop voltage Vcc_stop _ 6.5 7 7.5 Vv Start-stop voltage hysteresis Vec_hys = = 0.5 _ Vv Current consumption Icc Vec=8V-40V _ 10 12 mA Current consumption with remote control OFF lcc_off Vcc=8V-~40V 1.2 1.5 mA Voltage with remote control terminal ON Vrc_on Vcec=8V-40V -0.2 = 0.5 Vv Voltage with remote control terminal OFF Vre_off Vcc=8V-40V 2.5 = 5.3 Vv Current with remote control terminals shorted Irc Vec=8V-40V - = 250 UA Boot terminal voltage Vboot Vec=24V 6 6.5 7 Vv Internal reference voltage Vref Vec=8V-40V 4.75 5 5.25 V Internal oscillation frequency fosc Vec=24V 212.5 250 287.5 kHz Over-current threshold voltage Vth_OCL Vec=24V 0.162 0.19 0.218 Vv Soft-start terminal current Is/s Vec=24V -20 -12.5 -5 HA "H" CHG terminal input voltage Vechgh _ 4.5 = Vref V "L" CHG terminal input voltage Vchgl = GND = 0.5 Vv Over-current protection operating temperature T_TSD - = 150 = <Recommended operating conditions> Item Recommended Unit Value Input voltage (Ta=-10 to +85C) 8.0 to 40 V Input voltage (Ta=-30 to -10C) 8.5 to 40 V Operating temperature -30 to 85 c Belinix DC-DC CONVERTERS BDD20050412- :050704Power I_ BiC1421 Bellnix <Block diagram> Vref Veco Vboot VB VGH VDD (3) (38) 23)(18-21 TL 1 ric @){ Sot LP} siatersy >| eh, ey L4 . 100 150C Reference {FSD} I> UpperiiowerMos High Sid 3 5.0V4E5% Simuttancoush OFF river E For 3.3V Enorane PWM pear MOS Prevent 11-14) VOUT Simuttaneously ON (1-14) , | For 5V Low Side =] . Vref=6. BV) Low Side 3 Driver r (i6)P.GND <External dimensions> 2) 14. Imax. >I % 17 HHHAHRHAARHARAARE Bellnix s| 3 BIC1421. | 2/8 @ Pool (Ee a | 16 Detail of A portion A A portion | lO i0 TS] Terminal base: Cu plating: Ni/ Pd/ Au Case Black epoxy resin (UL94 V-0) Bellnix DC-DC CONVERTERS BDD20050412. 1050704Bellinix Power I BIC1421 <Terminal functions> Terminal No. Symbol Function { S/S Soft-start capacitor terminal 2 F/B OCL- |Over-current Detection terminal, feedback terminal 3 OCL+ |Over-current detection terminal (+ ) 4,26 GND Ground terminal 5 R/C Remote ON/OFF control terminal 6 Vec Control circuit power supply terminal 8 Vboot Main switch MOSFET control circuit power supply terminal 9 VGL Low side MOSFET gate terminal for synchronous rectification 11-14 VOUT [Power supply output terminal 16 P.GND = |Output circuit ground terminal 18-21 VDD Main switch MOSFET power supply terminal 23 VGH Main switch high side MOSFET gate terminal Output boot strap terminal. Used for connecting 25 VB condensers across VB and VOUT terminals to boot strap IC internal main switch MOSFET control circuit. 27 3.3V/5V | Terminal for switching the output voltage 28 Vref Internal reference voltage output terminal 30 ampOUT [Internal error amplifier output terminal 32 amp- Internal error amplifier reversing input terminal 7,10,15,17 N/C No connection terminal ( N/C terminal ) 22,24,29,31 <Peripheral functions> 1. Internal reference voltage ( Vref ) 5. Switchable Output Voltage (3.3V/5.0V) IC internal circuitry reference voltage is provided by the temperature It is a terminal for switching the output voltage. Set the output voltage compensation reference voltage (5.0V). This reference voltage (Vref) using this terminal. provides a maximum external output current measured at the terminal Desired output 5.0V: Connect this terminal (27pin) to 26pin at "L level. of 1mA. Desired output 3.3V: Connect this terminal (27pin) to 28pin at "H" level. 2. Oscillation circuit (OSC ) 6. Remote ON/OFF (R/C) The oscillation circuit is built into the device. No external oscillation It is a remote terminal for output voltage ON/OFF control. capacitor nor resistor is required. The oscillation frequency (250KHz) Output On: 0-0.5V (Ground this terminal to GND) is set internally and has a sawtooth wave pattern. The sawtooth Output Off: 2.5-5.3V (This terminal is open) wave pattern cannot be outputted externally. 7. Soft-start (S/S) 3. Error amplifier ( Error amp ) It is a capacitor connection terminal for soft-start. The error amplifier senses the DC to DC converter voltage and The ON range of main MOSFET at start-up will gradually enlarge by provides a PWM control signal output. Loop gain between the error connecting a capacitor which is for soft-start to this terminal. amplifier ampOUT terminal and the negative amp terminal is Connect a capacitor of approximately 0.1UF to this terminal. determined by the connections between the feedback resistor and the capacitor. This provides stable loop compensation throughout the system. 4. Over-current sensor ( OCL ) The OCL is a pulse-by-pulse overcurrent sensor. The voltage drop across the external current sensing resistor is measured between the negative and positive terminals of the OCL. If the voltage drop exceeds 0.19V, the main switch (MOSFET) opens. 4 Bellnix DC-DC CONVERTERS BDD20050412- 050704Power IC BiC1421 1. Soldering pattern reference (Reflow-type) Infrared and air reflow soldering conditions Dimensions: mm i { SERRE Banna aa : ih Heating sphere 1 | Within 2 cycles pemee 260Cmax. Ps 2 if a 230C 3 <= 220C : 9 | Ss GOR RRRRERRAeR ae = S Preheat 08 05 | a | . a wn " y < . ie oe 2 i a at t 2. Mounting cautions 3 i 141030 Sec. sie Vibration and other mechanical disturbances can exert stress on the * i< = internal parts of the device. Carefully examine your equipment and place Time the device where vibration and other shock is minimal. 4. Cleaning cautions 3. Soldering Conditions Carefully remove all flux. Allow time for the soldered areas to The infrared reflow method is recommended. If the soldering time is too long completely dry before using the device. or the soldering temperature is too high, it may damage the function of this IC, so be sure to use within the specified conditions. 5. Resinous Coating 1) Infrared reflow method When remolding after mounting the device to the board, if the Temperature profile in the reflow method is as shown in the figure curing stress of the resinous is strong, it may give stress to the at the right. component. So be careful of choosing the resinous and calcify time. 2) Wave soldering conditions - Pre-heating conditions Center of the case temp.: 80-140C Pre-heating time: 30-60sec - Heating conditions Soldering temp.: 265+5C Heating time: 10i1sec - Heating frequency: one time - Notes Solder bridge will be effected by the land, so give consideration when designing the printed board. 3) Storage conditions After the dampproof package is opened, in an environment of temp. 30C and relative temp. 70% or below: within 168Hrs. 4) Baking conditions One time within 24Hrs. at 125C 5) Soldering Iron When using a soldering iron, execute under the following conditions. - Soldering iron tip temp.: 380+10C - Heating time: 3+1sec - Heating frequency: one time Bellnix DC-DC CONVERTERS 5 BDD20050412- 1050704Power I_ Bic1421 <Usage> 1. To prevent reverse input voltage protection The BIC1421 device has an output current drop function. In the event of power IC device malfunction resulting in excessive input current flow, smoke and flame may be emitted from the equipment. To prevent this, install fuse or protective circuitry to the power IC device input line. Install the fuse or protective circuitry to the positive side of the input line. Be sure that the fuse or protective circuitry is not too large to effectively protect the circuitry (the input line must be capable of carrying enough current to blow the fuse). FUSE O_O +Vin y DC-DC Converter Load 2. Over-voltage protection The BIC1421 power IC device does not have an over-voltage (voltage surge) protection function. If a malfunction occurs in the device internal circuitry, there may be a voltage surge. Output will reflect this surge and damage to equipment may result. Smoke and flame may be emitted from the equipment. To prevent this, be sure to install voltage surge sensing and protection circuitry. There are a number of ways to protect against voltage surge. Figure shows a typical voltage surge protection set-up. The voltage surge sensing and protection circuit should be installed as close as possible to the load (away from the output smoothing capacitor). Reference part example Over-vollage FUSE : . Protection Circuit +Vi Load - Bellnix DC-DC CONVERTERS BDD20050412~ 050704Bellnix Power IC BIC1421 <Standard connections> BIC 1421 is a power IC developed for synchronous rectification type chopper method. This IC has built the major components of the controller IC part, high-side and low-side MOSFET for commutating etc. into one package. Accessories such as external choke and capacitor are required for this device. - 27pin is for switching the output voltage Output voltage 3.3V: 27pin and 28pin is short Output voltage 5.0V: 27pin and 26pin is short - 9 and 23pins are the test terminals and must be left open. -7, 10, 15, 17, 22, 24, 29 and 31pins are N/C terminals (internally unconnected). - Be sure to prepare and connect the external parts shown in the diagram below. - The use of a low ESR product is recommended for output smooth capacitor. C6 D1 C7 7 8 5 11-14 L1 ving 18.211 ; b Bici421 ) | Fae RS a or 5.0V L&I we + Vout DC + +t bc Input |c1 ce{ Output -Vin O O-Vout <Reference parts> ; Output Voltage 3.3V/ 5.0V | Parts No. Component Output current example Type/ Manufacturer 1.2A 3.0A | IC1 MCMIC BIC1421 BIC1421 | Bellnix L141 Choke 22uH, 1.54 CDRH type |22uH.3.6A CDRH type | Sumida Electric D1 Diode 1SS300 18S300 | Toshiba | D2 Shottky diode |D1FS6 DiFS6 | Shindengen | R1 Resistance 0.1W, 5.6K 0.1W, 5.6K | Hokuriku Electric Industry | R2 Resistance \0.1W. 27K 0.1W, 27K | Hokuriku Electric Industry R3 | Resistance 0.14W. 300K 0.14W, 300K | Hokuriku Electric Industry R4 | Resistance 0.75W, 0.10 SR73K type |1W, 0.0390 NPR type | KOA | C1 Electrolyte capacitor |50V. 220uF 5OV, 220uF (2pes parallel KZE type Nippon Chemi-con | C2 Ceramic capacitor 25V, 0.047yF |25V, 0.047uF | GRM39 type or GRM40 type C3 Ceramic capacitor |50V. 2200PF |50V, 2200PF Murata C4 Ceramic capacitor |25V, 0.047yF 25V, 0.047UF or C5 Electrolyte capacitor |/16V. 0.1pF 16V, 0.1F C1608 type or C2012 type C6 Ceramic capacitor 50V. 1000PF |50V, 1000PF TDK C7 Ceramic capacitor |50V. 0.01uF |50V, 0.01 uF C8 Electrolyte capacitor |10V. 680uUF |10V, 680uF (2pcs parallel] KZE type Nippon Chemi-con Due to conditions, the fixed numbers may change. Bellnix DC-DC CONVERTERS 7 BDD20050412~ 050704Bellnix Power I BiC1421 <Electrical Characteristics> (Typical ex.) Below is a reference data measured with a circuit composed with additional components and reference components by fixed numbers based upon standard connection circuit diagram. (Ta=25C) Output Current Ex. . Item Component Conditions 1.2A 3.0A Rating Output Voltage V 3.3 | 5.0 3.3 5.0 Rating Output Current A 1.2 3.0 Rating Input Voltage Vv 24 Input Voltage Range V 8-40 Output current A 0-1.2 0-3.0 Output Voltage Setting Accurac - % 0.97 | 0.98 0.88 1.96 : Input Current (At no load) mA 11 12 16 | 24 Input Current (At rating load) _ A 0.197 0.280 0.503 0.714 Efficiency (At rating load) he 83.51 87.84 83.71 85.9 - Line Regulation | % | 1.91 2.38 1.79 2.15 For the line regulation 8V-40V. Load Regulation % | 0.14 0.36 0.52 0.66 For the load regulation 0-100% Ripple & Noise mVp-p 13/39 15/39 32/80 36/80 Over-current protection A 1.64 1.54 3.7 3.5 Standby Current mA 0.53 0.53 0.53 _ 0.53 At remote OFF Oscillation frequency Typ. KHz 250KHz fixed frequency * The above input and output specification is provided with rating value, unless otherwise specified. Efficiency Output Current Characteristics Efficiency Output Current (Input voltage=24V) Characteristics (Input voltage=24V) 100 100 80 80 = 60 x 60 B o V0=3.3V D> o Vo0=3.3V 2 s2 Vo=5V c A Vo=5V o & 3 40 o 40 ot ha lu uw 20 20 0 0 0 02 04 06 08 1 12 0 1 2 3 Output Current [A] Output Current [A] 8 Bellnix DC-DC CONVERTERS BDD20050412- 050704Bellnix <Basic operation explanation> This Power IC BIC1421 adopts the synchronous rectification method. With this method, the DC-DC converter has high efficiency and can supply large current. 1. Basic circuit Vin (8-40V) BIC1421 r ' ' Vout(3.3/5V) La R1 O FET1 : Main switch MOSFET FET2 : Bottom MOSFET D1 : Free Wheeling Diode R1 : Current detection resistance C1: Inpu it Capacitor C2 : Output Capacitor In general step-down chopper converters, the commutation circuit part is composed of diode D1 alone. In synchronous rectification type, FET2 is connected parallel to this commutation diode and the efficiency is improved. Moreover, it was general to adopt a P-channel when using a FET as a main switch, however with this Power IC BIC1421 a boost circuit is built-in and the main switching is done at the N-channel of MOSFET, thereby the efficiency can also be improved. 2. Flow of Vin the main current (FET1=ON) Vout f & | 5 &D1 (FET2=OFF . Ln ei a Vin (a) At ton Current (FET1=0FF) Vout { (FET2=ON)\ MIpt i "2 SRL (b) At toff current At ton: Passes FET1 and current flows into L1. At toff: Excitation current that has been saved at L1 go though FET2 (D1) and commutates. Belinix DC-DC CONVERTERS BDD200504 12-. 050704 Power IC BiC1421 3. Main current wave Main Current Wave is shown in the figure below. f Vin-Vout ton lon L (IFET1) loft y y q vor toff (IFET2+D1) yD y y A A C.CM. Critical mode IL DCM. C.C.M.: Continuous Conduction Mode D.C.M.: Discontinuous Conduction Mode At toff, the excitation current of the choke goes through D1, FET2 and commutates. But at the oblique parts it goes through D1 and the middle part goes through FET2. There are three current modes that flow into the choke. The superposed mode of direct current at rating load etc. is called C.C.M. The mode when current that flows into the choke is intermittent at light load is called D.C.M. The boundary between the C.C.M. and D.C.M. is called the critical mode. At C.C.M., the voltage applied to the choke during ton period becomes Vin-Vo, therefore the current inclination ZJIL will be Vin~-Vo = _-- * L When the FET1 goes off next, the ccurrent that has been flowing into the inductance will try to keep flowing into the same go through D1, FET2 and start commutation. For the commutating current, the same current value of the value right before FET1 went off will flow, and the same voltage as the output voltage will be added to the both ends of L1. Therefore the current inclination AIL when off will be AIL (ton) ton AIL (toff) =O xtoft And for C.C.M. the current inclination AIL is the same, so it will be oe ON yin = OO Vin ~ ton+ toff T To calculate the smooth choke inductance, design it so that the critical operation can be 15-20% of the rating current. Therefore, the inductance can be calculated with the equation below. , _vin-Vo ~ AIL Vin - Vo Vo x ton= x (0.15 to 0.2) xlox2 Vinxf * The equation on page 9 of the set-up standards, has put in consideration of diode Vf.Power IC Bic1421 <Basic device set-up standards> In the following order, the addition parts are designed. 1. Over-current detecting resistor (R1) selection 2. Inductance (L1) selection 3. Output capacitor (C2) selection 4. Input capacitor (C1) selection 1. Over-current detecting resistor (R1) Selection method The output current is detected by the drop voltage of resistor R1. The over-current protection circuit of pulse by pulse method operates when the voltage generated at the resistance is 0.19V+15%. _ Vth R= Iocp [ohm] Vth: Over-current detecting voltage (0.19V+15%) locp: Over-current operating point At the over-current operating point, the maximum output current will be set at 110-120%. At the over-current operating point, switching noise and other factors may cause some variation in the calculated value. Check your own equipment and calculate the value accordingly. 2. Inductance (L1) selection Inductance is determined so that 4IL is 30% of the rating output current at the maximum input voltage. _ Win (max)Vo)x (Vo+ VF) LI= A ILx (Vin (max)-+ Vf) x F [H] Vin (max): Maximum input voltage Vo: Output voltage Vf: Forward voltage of the commutation diode (approx. 0.5V ) AIL: 15-20% of output current (lox0.15 to 0.2) f: Oscillation frequency (250kHz) Regarding choke coil selection, be careful of direct superposition characteristics, not to saturate the choke coil even in the over-current area. 10 3. Output capacitor (C2) selection If an electrolytic capacitor is used, output ripple is determined by AIL and capacitor impedance. Use the equation below to calculate the value. Select a device providing an impedance (Zc) lower than the calculated value. _ Vrip Zo = AIL Vrip; Output ripple voltage (Ex. 30mVp-p) AIL: 15-20% of output current 4. Input capacitor ( C1 ) selection A large ripple current flows through the input capacitor. Use the equation below to calculate the value. Select a device providing a higher ripple current capacity (Irip) than the calculate value. _ Vo+VF ~ Vi(min} VF lip = ./D(1 D) xlo D: Duty (Ton/T) Vo: Output voltage Vin (min): Minimum input voltage Vf: Forward voltage of the commutation diode (approx. 0.5V ) 5. Thermal management Temperature increase varies with input voltage, output voltage and output current. Case surface temperatures should no exceed 105C. Set up your equipment accordingly. Bellnix DC-DC CONVERTERS BDD20050412~ 050704Bellnix Power IC BiC1421 1. Tape & Reel Dimensions: mm a . 12.0' sop 48: 10) * Dimensions comply with JIS , C-0806-3 <_ >I 0.1 0:4 4.0 ; 25" og! 0 git Lr = 24.0*:3 2. Reel + Material : Polystyrene+Carbon _____ Direction of feed a 1s =| %) 9 TEL. 2! 2 oo oe]; & \ 25.559 29.5*' Bellnix DC-DC CONVERTERS BDD20050412~ 050704 11Bellnix Power IC BiC1421 3. Leader and Trailer Trailer (160mm min. ) Device Top cover (400mm min. ) ra NO Wak NN O 0 eveeeeee OO O eoore (eecccee 0 0 0 eeeee2 0 0 | Uf eee OOM sce feos goo Leader (100mm min. ) 12 Bellnix DC-DC CONVERTERS BDD20050412- 050704<Precautions> - This product is for being used in general electric equipments (business equipments, telecommunication equipments and measurement equipments). May not be used in medical equipments, nuclear equipments and trains which would affect lives or properties directly by the failure of this product. - Do not remodel, process or use in a non-standard, it may cause serious accidents. We can not take responsibility for those products used in a wrong way or in a non-standard. - When there is a problem, an excessive voltage may occur to the output and cause voltage decrease. Built-in a protection circuit (over-voltage protection, over-current protection etc. ) assuming to have problems of malfunction and damage of equipments. - Always keep the standards (input voltage, operating temperature and so on), without fail and be sure to insert a protection element to the input line. Also, always confirm each polarity (input and output) that there is no miss wiring before energizing. <<Wrong way of using will cause smoke fire.>> - This product does not have a built-in over-voltage protection. When over-voltage occurs due to the abnormality in the module, there is a mode that input voltage comes out at it is, and may cause smoke and ignition. To prevent this, be sure to add over-voltage protection. <<When over-voltage occurs, the remote ON/ OFF pin of this IC do not function .>> - The contents specified herein are accurate and reliable, however we shall not take any responsibilities for any damages and loss or infringement of patent and any other rights, as a result of using these materials. - This material does not guarantee the execution of patent or other rights of third party or approve the right of execution hereof. - Reprinting and copying these materials are not allowed partially or totally without our prior written approval. |Export regulations for stragety goods| - Classified into integrated circuits, in the export regulations 1-7 section of the attached table, and the ordiance of the Ministry of Economy, Trade and Industry clause 6, - This product is a subject for KNOW regulation. e .,4 ut Bellnix % AU Bellnix. Co., Ltd. 5-7-8 Negishi Saitama-shi, Saitama, JAPAN 336-0024 TEL: 048-864-7733 FAX: 048-861-6402 E-mail: info@bellnix.co.jp URL: http://www.bellnix.co.jp/ *All specification are subjected to change without notice. Printed in Japan BD20050412 = 050704 Y Dream and Creation