BD9150MUV_10

Single-chip Type with Built-in FET Switching Regulator Series Output 1.5A or Less High Efficiency Step-down Switching Regulator with Built-in Power MOSFET BD9150MUV No.10027ECT13 ●Description ROHM’s high efficiency dual step-down switching regulator BD9150MUV is a 2ch output power supply designed to produce a low voltage including 3.3,1.2 volts from 5.0 volts power supply line. Offers high efficiency with our original pulse skip control technology and synchronous rectifier. Employs a current mode control system to provide faster transient response to sudden change in load. ●Features 1) Offers fast transient response with current mode PWM control system. 2) Offers highly efficiency for all load range with synchronous rectifier (Pch/Nch FET) TM and SLLM (Simple Light Load Mode) 3) 2ch output power supply. 4) Each of EN controls 2ch output. 5) Incorporates soft-start function. 6) Incorporates ULVO functions. 7) Incorporates thermal protection and short-current protection circuit with time delay function. 8) Incorporates shutdown function Icc=0μA(Typ.) 9) Output current max 1.5A/1.5A. 10) Employs small surface mount package : VQFN020V4040 ●Use Power supply for LSI including DSP, Micro computer and ASIC ●Absolute Maximum Rating (Ta=25℃) Parameter Vcc Voltage EN Voltage SW Voltage Power Dissipation Operating Temperature Range Storage Temperature Range Maximum Junction *1 *2 *3 *4 *5 Symbol VCC VEN1 VEN2 VSW1 VSW2 Pd1 Pd2 Pd3 Pd4 Topr Tstg Tjmax Limit -0.3～+7 *1 -0.3～+7 -0.3～+7 -0.3～+7 -0.3～+7 0.34*2 0.70 *3 1.21 *4 3.56*5 -40～+85 -55～+150 +150 Unit V V V V V W W W W ℃ ℃ ℃ Pd should not be exceeded. IC only 1-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm2 4-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm2 , in each layers 4-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 5505mm2, in each layers www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 1/16 2010.04 - Rev.C BD9150MUV ●Operating Conditions (Ta=-40～+85℃) Parameter Vcc Voltage EN Voltage Output Voltage range SW Average Output Current *6 Pd and ASO should not be exceeded. Technical Note Symbol VCC VEN1 VEN2 VOUT2 ISW1 ISW2 Min. 4.75 0 0 0.8 - Limit Typ. 5.0 - Max. 5.5 5.5 5.5 2.5 1.5*6 1.5* 6 Unit V V V V A A ●Electrical Characteristics ◎ (Ta=25℃ AVCC=PVCC=5.0V, EN1=EN2=AVCC ,unless otherwise specified.) Parameter Standby Current Bias Current EN Low Voltage EN High Voltage EN Input Current Oscillation Frequency Pch FET ON Resistance Nch FET ON Resistance FB Reference Voltage UVLO Threshold Voltage UVLO Release Voltage Soft Start Time Timer Latch Time Output Short circuit Threshold Voltage Symbol ISTB ICC VENL VENH IEN FOSC RONP1 RONP2 RONN1 RONN2 FB1 FB2 VUVLO1 VUVLO2 TSS TLATCH VSCP1 VSCP2 Min. 2.0 1.2 3.25 0.788 3.6 3.65 0.4 0.68 Limit Typ. 0 500 GND Vcc 1 1.5 0.17 0.17 0.13 0.13 3.3 0.8 3.8 3.9 0.8 1.36 1.65 0.4 Max. 10 800 0.8 10 1.8 0.3 0.3 0.2 0.2 3.35 0.812 4.0 4.2 1.6 2.72 2.4 0.56 Unit μA μA V V μA MHz Ω Ω Ω Ω V V V V ms ms V V SCP/TSD ON FB1=3.3→0V FB2=0.8→0V Vcc=5V Vcc=5V Vcc=5V Vcc=5V ±1.5% ±1.5% VCC=5→0V VCC=0→5V Standby Mode Active Mode VEN1=VEN2=2V Condition EN1=EN2=0V www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 2/16 2010.04 - Rev.C BD9150MUV ●Block Diagram, Application Circuit 【BD9150MUV】 AVCC Technical Note 4.0±0.1 4.0±0.1 D9150 PVCC FB1 Gm Amp Current Comp R S Slope1 Q Current Sense/ Protect + Driver Logic SW1 Lot No. EN1 AGND Soft Start1 1.0Max. S ITH1 CLK1 PGND1 SCP1 0.02 +0.03 -0.02 (0.22) 0.08 S VREF OSC CLK2 SCP/ TSD UVLO C0.2 2.1±0.1 1 5 SCP2 PVCC Current 0.4±0.1 2.1±0.1 20 16 15 11 6 Current Comp Gm Amp R S Slope2 Q Sense/ Protect + Driver Logic 10 FB2 EN2 ITH2 Soft Start2 SW2 1.0 0.5 0.25 +0.05 -0.04 CLK2 PGND2 (Unit : mm) AGND Fig.1 BD9150MUV TOP View Fig.2 BD9150MUV Block Diagram ●Pin No. & function table Pin Pin No. name 1 2 3 4 5 6 7 8 9 10 PGND2 PVcc PVcc PVcc PGND1 PGND1 SW1 SW1 EN1 FB1 Function Pin No. 11 12 13 14 15 16 17 18 19 20 Pin name ITH1 AGND N.C. AVcc ITH2 FB2 EN2 SW2 SW2 PGND2 Function Ch1 GmAmp output pin/Connected phase compensation capacitor Ground Non Connection VCC power supply input pin Ch1 GmAmp output pin/Connected phase compensation capacitor Ch2 output voltage detect pin Ch2 Enable pin(High Active） Ch2 Pch/Nch FET drain output pin Ch2 Pch/Nch FET drain output pin Ch2 Lowside source pin Ch2 Lowside source pin Highside FET source pin Highside FET source pin Highside FET source pin Ch1 Lowside source pin Ch1 Lowside source pin Ch1 Pch/Nch FET drain output pin Ch1 Pch/Nch FET drain output pin Ch1 Enable pin(High Active) Ch1 output voltage detect pin www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 3/16 2010.04 - Rev.C BD9150MUV ●Characteristics data 3.5 OUTPUT VOLTAGE:VOUT[V] Technical Note 3.5 OUTPUT VOLTAGE:VOUT[V] 3.5 3.0 OUTPUT VOLTAGE:VOUT[V] 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 INPUT VOLTAGE:VCC[V] 5 【VOUT1=3.3V】 3.0 2.5 2.0 1.5 1.0 0.5 0.0 2.5 2.0 1.5 1.0 0.5 0.0 Ta=25℃ Io=1.5A 【VOUT1=3.3V】 【VOUT2=1.2V】 【VOUT1=3.3V】 【VOUT2=1.2V】 VCC=5V Ta=25℃ Io=0A 0 1 2 3 4 5 【VOUT2=1.2V】 VCC=5V Ta=25℃ 0 EN VOLTAGE:VEN[V] 1 2 3 OUTPUT CURRENT:IOUT[A] 4 Fig.3 Vcc - VOUT 3.40 Fig.4 VEN - VOUT 1.25 100 Fig.5 IOUT - VOUT OUTPUT VOLTAGE:VOUT[V] EFFICIENCY: η[%] 3.35 OUTPUT VOLTAGE:VOUT[V] 【VOUT1=3.3V】 【VOUT2=1.2V 設定】 【VOUT2=1.2V】 1.23 90 80 70 60 50 40 30 20 10 【VOUT2=1.2V】 【VOUT2=2.5V】 【VOUT1=3.3V】 3.30 1.20 【VOUT2=1.5V】 3.25 1.18 VCC=5V Io=0A 3.20 -40 -20 0 20 40 60 TEMPERATURE:Ta[℃] 80 VCC=5V Io=0A -40 -20 0 20 40 60 TEMPERATURE:Ta[℃ ] 80 VCC=5V Ta=25℃ 10 100 1000 OUTPUT CURRENT:IOUT[mA] 10000 1.15 0 Fig. 6 Ta - VOUT Fig. 7 Ta - VOUT Fig.8 Efficiency 1.7 1.7 200 175 FREQUENCY:Fosc[MHz] FREQUENCY:FOSC[MHz] PMOS ON RESISTANCE:RON[m Ω] 1.6 1.6 150 125 100 75 50 25 NMOS 1.5 1.5 1.4 1.4 VCC=5V 1.3 -40 -20 0 20 40 60 TEMPERATURE:Ta[℃] 80 VCC=5V 1.3 4.5 4.75 5 5.25 INPUT VOLTAGE:VCC[V] 5.5 0 -40 -20 0 20 40 60 80 TEMPERATURE:Ta[℃] 100 Fig.9 Ta - Fosc 2.0 1.8 1.6 EN VOLTAGE:VEN[V] Fig.10 Vcc - Fosc 600 CIRCUIT CURRENT:ICC[μA] 500 400 300 200 Fig.11 Ta – RONN, RONP Ta=25℃ VCC=5V,Ta=25℃ 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -40 -20 0 20 40 60 80 EN1=E2 VOUT1 VCC=5V VCC=5V 100 0 -40 -20 0 20 40 60 80 VOUT2 TEMPERATURE:Ta[℃] TEMPERATURE:Ta[℃] Fig.12 Ta-VEN Fig.13 Ta-ICC Fig.14 Soft start waveform (Io=0mA) www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 4/16 2010.04 - Rev.C BD9150MUV ●Characteristics data【BD9150MUV】 Technical Note VCC=5V,Ta=25℃ SW1 EN1=E2 VCC=5V,Ta=25℃ SW1 VCC=5V,Ta=25℃ VOUT1 VOUT1 VOUT2 VOUT1 Fig.15 Soft start waveform (Io=1.5A) Fig.16 SW1 waveform (Io=0mA) Fig.17 SW1 waveform (Io=1.5A) VCC=5V,Ta=25℃,VOUT2=1.2V SW2 SW2 VCC=5V,Ta=25℃,VOUT2=1.2V VOUT1 VCC=5V,Ta=25℃ VOUT2 VOUT2 IOUT1 Fig.18 SW2 waveform (Io=0mA) Fig.19 SW2 waveform (Io=1.5A) Fig.20 VOUT1 Transient Response (Io0.5A→1.5A / usec) VCC=5V,Ta=25℃ VOUT2 VCC=5V,Ta=25℃,VOUT2=1.2V VOUT2 VCC=5V,Ta=25℃,VOUT2=1.2V VOUT1 IOUT1 IOUT2 IOUT2 Fig.21VOUT1 Transient Response (Io1.5A→0.5A/ usec) Fig.22 VOUT2 Transient Response (Io0.5A→1.5A/ usec) Fig.23 VOUT2 Transient Response (Io1.5A→0.5A/ usec) www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 5/16 2010.04 - Rev.C BD9150MUV ●Information on advantages Advantage 1：Offers fast transient response with current mode control system. BD9150MUV (Load response IO=0.5A→1.5A) Technical Note BD9150MUV (Load response IO=1.5A→0.5A) VOUT VOUT IOUT IOUT Fig.24Transient response Advantage 2： Offers high efficiency for all load range. ・For lighter load: Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as switching dissipation (PSW), gate charge/discharge dissipation, ESR dissipation of output capacitor (PESR) and on-resistance dissipation (PRON) that may otherwise cause degradation in efficiency for lighter load. Achieves efficiency improvement for lighter load. ・For heavier load: Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor. ON resistance of Highside MOS FET : 170mΩ(Typ.) ON resistance of Lowside MOS FET : 130mΩ(Typ.) 100 Efficiency η[%] SLLM ② 50 ① PWM ①inprovement by SLLM system ②improvement by synchronous rectifier Achieves efficiency improvement for heavier load. Offers high efficiency for all load range with the improvements mentioned above. 0 0.001 0.01 0.1 Output current Io[A] 1 Fig.25 Efficiency Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated. ・Output capacitor Co required for current mode control: 22μF ceramic capacitor ・Inductance L required for the operating frequency of 1 MHz: 2.2μH inductor ・Incorporates FET + Boot strap diode Reduces a mounting area required. VOUT1 COUT1 L1 FB1 ITH1 EN1 SW1 SW1 PGND1 PGND1 PVcc PVcc PVcc PGND2 EN2 SW2 SW2 PGND2 20mm COUT1 CIN1 CIN2 COUT2 RITH1 CITH1 AGND N.C. AVcc ITH2 CIN1 CIN2 15mm L1 R1 L2 RITH2 CITH2 FB2 COUT2 VOUT2 L2 R2 R1 RITH1 RITH2 R2 CITH1 CITH2 Fig.26 Example application www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 6/16 2010.04 - Rev.C BD9150MUV Technical Note ●Operation BD9150MUV is a synchronous rectifying step-down switching regulator that achieves faster transient response by employing current mode PWM control system. It utilizes switching operation in PWM (Pulse Width Modulation) mode for heavier load, while it utilizes SLLM (Simple Light Load Mode) operation for lighter load to improve efficiency. ○Synchronous rectifier It does not require the power to be dissipated by a rectifier externally connected to a conventional DC/DC converter IC, and its P.N junction shoot-through protection circuit limits the shoot-through current during operation, by which the power dissipation of the set is reduced. ○Current mode PWM control Synthesizes a PWM control signal with a inductor current feedback loop added to the voltage feedback. ・PWM (Pulse Width Modulation) control The oscillation frequency for PWM is 1 MHz. SET signal form OSC turns ON a highside MOS FET (while a lowside MOS FET is turned OFF), and an inductor current IL increases. The current comparator (Current Comp) receives two signals, a current feedback control signal (SENSE: Voltage converted from IL) and a voltage feedback control signal (FB), and issues a RESET signal if both input signals are identical to each other, and turns OFF the highside MOS FET (while a lowside MOS FET is turned ON) for the rest of the fixed period. The PWM control repeat this operation. ・SLLM (Simple Light Load Mode) control When the control mode is shifted from PWM for heavier load to the one for lighter load or vise versa, the switching pulse is designed to turn OFF with the device held operated in normal PWM control loop, which allows linear operation without voltage drop or deterioration in transient response during the mode switching from light load to heavy load or vise versa. Although the PWM control loop continues to operate with a SET signal from OSC and a RESET signal from Current Comp, it is so designed that the RESET signal is held issued if shifted to the light load mode, with which the switching is tuned OFF and the switching pulses are thinned out under control. Activating the switching intermittently reduces the switching dissipation and improves the efficiency. SENSE Current Comp RESET Level Shift Gm Amp. ITH OSC RQ FB SET S Driver Logic SW Load IL VOUT VOUT Fig.27 Diagram of current mode PWM control PVCC SENSE FB SET GND GND GND IL(AVE) SET PVCC SENSE FB GND GND Current Comp Current Comp RESET SW IL RESET SW GND IL 0A VOUT VOUT(AVE) VOUT Not switching TM VOUT(AVE) Fig.28 PWM switching timing chart Fig.29 SLLM switching timing chart www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 7/16 2010.04 - Rev.C BD9150MUV Technical Note ●Description of operations ・Soft-start function EN terminal shifted to “High” activates a soft-starter to gradually establish the output voltage with the current limited during startup, by which it is possible to prevent an overshoot of output voltage and an inrush current. ・Shutdown function With EN terminal shifted to “Low”, the device turns to Standby Mode, and all the function blocks including reference voltage circuit, internal oscillator and drivers are turned to OFF. Circuit current during standby is 0μF (Typ.). ・UVLO function Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. And the hysteresis width of 100mV (Typ.) is provided to prevent output chattering. Hysteresis 100mV VCC EN1,EN2 VOUT1, VOUT2 Tss Soft start Standby mode Operating mode Standby mode UVLO Tss Tss Operating mode Standby mode EN Operating mode Standby mode UVLO UVLO Fig.30 Soft start, Shutdown, UVLO timing chart ・Short-current protection circuit with time delay function Turns OFF the output to protect the IC from breakdown when the incorporated current limiter is activated continuously for the fixed time(TLATCH) or more. The output thus held tuned OFF may be recovered by restarting EN or by re-unlocking UVLO. EN1＝EN2 Output Short circuit Threshold Voltage VOUT1 Output OFF Latch VOUT2 IL Limit IL1 IL2 Standby mode t1 IRMS(max.) 2 If VCC=5.0V, VOUT=1.2V, and IOUTmax.=1.5A, (BD9150MUV) IRMS=2× √ .2(5.0-1.2) 1 5.0 =0.85[ARMS] When Vcc=2×VOUT, IRMS= Fig.35 Input capacitor A low ESR 22μF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency. www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 11/16 2010.04 - Rev.C BD9150MUV Technical Note 4. Determination of RITH, CITH that works as a phase compensator As the Current Mode Control is designed to limit a inductor current, a pole (phase lag) appears in the low frequency area due to a CR filter consisting of a output capacitor and a load resistance, while a zero (phase lead) appears in the high frequency area due to the output capacitor and its ESR. So, the phases are easily compensated by adding a zero to the power amplifier output with C and R as described below to cancel a pole at the power amplifier. fp(Min.) A Gain [dB] fp(Max.) 0 fz(ESR) IOUTMin. 0 IOUTMax. fp= 1 2π×RO×CO 1 fz(ESR)= 2π×ESR×CO Pole at power amplifier When the output current decreases, the load resistance Ro increases and the pole frequency lowers. fp(Min.)= 1 [Hz]←with lighter load 2π×ROMax.×CO 1 2π×ROMin.×CO [Hz] ←with heavier load Phase [deg] -90 Fig.36 Open loop gain characteristics fp(Max.)= A Gain [dB] 0 0 Phase [deg] -90 fz(Amp.) Zero at power amplifier Increasing capacitance of the output capacitor lowers the pole frequency while the zero frequency does not change. (This is because when the capacitance is doubled, the capacitor ESR reduces to half.) fz(Amp.)= 1 2π×RITH×CITH Fig.37 Error amp phase compensation characteristics L1 FB1 ITH1 EN1 SW1 SW1 PGND1 PGND1 PVcc PVcc PVcc PGND2 EN2 SW2 SW2 PGND2 VOUT1 ESR COUT1 RO1 RITH1 CITH1 AGND N.C. AVcc ITH2 CIN1 CIN2 RITH2 CITH2 FB2 COUT2 ESR VOUT2 L2 R2 R1 RO2 Fig.38 Typical application Stable feedback loop may be achieved by canceling the pole fp (Min.) produced by the output capacitor and the load resistance with CR zero correction by the error amplifier. fz(Amp.)= fp(Min.) 1 2π×RITH×CITH = 1 2π×ROMax.×CO www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 12/16 2010.04 - Rev.C BD9150MUV 5. Determination of output voltage The output voltage Vout is determined by the equation (6): VOUT=(R2/R1+1)×VADJ・・・(6) VADJ: Voltage at ADJ terminal (0.8V Typ.) With R1 and R2 adjusted, the output voltage may be determined as required. L2 Technical Note Output SW2 Cout2 R2 FB2 Adjustable output voltage range : 0.8V～2.5V R1 Fig.39 Determination of output voltage Use 1 kΩ～100 kΩ resistor for R1. If a resistor of the resistance higher than 100 kΩ is used, check the assembled set carefully for ripple voltage etc. ●BD9150MUV Cautions on PC Board layout L1 FB1 EN1 SW1 SW1 PGND1 ITH1 VOUT1 COUT1 RITH1 CITH1 PGND1 PVcc PVcc PVcc PGND2 EN2 SW2 SW2 PGND2 AGND N.C. AVcc ITH2 CIN1 CIN2 RITH2 CITH2 FB2 COUT2 VOUT2 L2 R2 R1 Fig.40 Layout diagram ① ② ※ Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the pin PGND. Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring. VQFN020V4040 (BD9150MUV) has thermal PAD on the reverse of the package. The package thermal performance may be enhanced by bonding the PAD to GND plane which take a large area of PCB. www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 13/16 2010.04 - Rev.C BD9150MUV ●Recommended components Lists on above application Symbol L1,2 CIN1,CIN2 Cout1,Cout2 CITH1 RITH1 Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor Resistance Part Value 2.2uH 2.2uH 22uF 22uF 330pF 56kΩ VOUT=1.0V CITH2 Ceramic capacitor VOUT=1.2V VOUT=1.5V VOUT=1.8V VOUT=2.5V VOUT=1.0V VOUT=1.2V VOUT=1.5V VOUT=1.8V VOUT=2.5V 330pF 330pF 330pF 330pF 330pF 39kΩ 47kΩ 56kΩ 75kΩ 91kΩ Manufacturer TDK TDK Murata Murata Murata Rohm Murata Murata Murata Murata Murata Rohm Rohm Rohm Rohm Rohm Technical Note Series LTF5022-2R2N3R2 LTF5022-2R2N3R2 GRM32EB11A226KE20 GRM31CB30J226KE18 CRM18 Serise MCR03 Serise CRM18 Serise GRM18 Serise GRM18 Serise GRM18 Serise GRM18 Serise MCR03 Serise MCR03 Serise MCR03 Serise MCR03 Serise MCR03 Serise RITH2 Resistance ※The parts list presented above is an example of recommended parts. Although the parts are sound, actual circuit characteristics should be checked on your application carefully before use. Be sure to allow sufficient margins to accommodate variations between external devices and this IC when employing the depicted circuit with other circuit constants modified. Both static and transient characteristics should be considered in establishing these margins. When switching noise is substantial and may impact the system, a low pass filter should be inserted between the VCC and PVCC pins, and a schottky barrier diode or snubber established between the SW and PGND pins. ●I/O equivalence circuit 【BD9150MUV】 ・EN1,EN2 pin ・SW1,SW2 PVCC PVCC PVCC EN1,EN2 SW1,SW2 ・FB1,FB2 pin ・ITH1,ITH2 pin AVCC FB1,FB2 ITH1,ITH2 Fig.41 I/O equivalence circuit www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 14/16 2010.04 - Rev.C BD9150MUV Technical Note ●Notes for use 1. Absolute Maximum Ratings While utmost care is taken to quality control of this product, any application that may exceed some of the absolute maximum ratings including the voltage applied and the operating temperature range may result in breakage. If broken, short-mode or open-mode may not be identified. So if it is expected to encounter with special mode that may exceed the absolute maximum ratings, it is requested to take necessary safety measures physically including insertion of fuses. 2. Electrical potential at GND GND must be designed to have the lowest electrical potential In any operating conditions. 3. Short-circuiting between terminals, and mismounting When mounting to pc board, care must be taken to avoid mistake in its orientation and alignment. Failure to do so may result in IC breakdown. Short-circuiting due to foreign matters entered between output terminals, or between output and power supply or GND may also cause breakdown. 4. Thermal shutdown protection circuit Thermal shutdown protection circuit is the circuit designed to isolate the IC from thermal runaway, and not intended to protect and guarantee the IC. So, the IC the thermal shutdown protection circuit of which is once activated should not be used thereafter for any operation originally intended. 5. Inspection with the IC set to a pc board If a capacitor must be connected to the pin of lower impedance during inspection with the IC set to a pc board, the capacitor must be discharged after each process to avoid stress to the IC. For electrostatic protection, provide proper grounding to assembling processes with special care taken in handling and storage. When connecting to jigs in the inspection process, be sure to turn OFF the power supply before it is connected and removed. 6. Input to IC terminals + This is a monolithic IC with P isolation between P-substrate and each element as illustrated below. This P-layer and the N-layer of each element form a P-N junction, and various parasitic element are formed. If a resistor is joined to a transistor terminal as shown in Fig 42. ○P-N junction works as a parasitic diode if the following relationship is satisfied; GND>Terminal A (at resistor side), or GND>Terminal B (at transistor side); and ○if GND>Terminal B (at NPN transistor side), a parasitic NPN transistor is activated by N-layer of other element adjacent to the above-mentioned parasitic diode. The structure of the IC inevitably forms parasitic elements, the activation of which may cause interference among circuits, and/or malfunctions contributing to breakdown. It is therefore requested to take care not to use the device in such manner that the voltage lower than GND (at P-substrate) may be applied to the input terminal, which may result in activation of parasitic elements. Resistor Pin A Pin A P+ N P P+ Transistor (NPN) Pin B C B E B P P+ N C E Pin B N N Parasitic element N P+ N P substrate Parasitic element GND P substrate Parasitic element GND GND GND Parasitic element Other adjacent elements Fig.42 Simplified structure of monorisic IC 7. Ground wiring pattern If small-signal GND and large-current GND are provided, It will be recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single ground at the reference point of the set PCB so that resistance to the wiring pattern and voltage fluctuations due to a large current will cause no fluctuations in voltages of the small-signal GND. Pay attention not to cause fluctuations in the GND wiring pattern of external parts as well. 8 . Selection of inductor It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. Especially, in case output voltage is set 1.6V or more, 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. Furthermore, in any case, it is recommended to start up the output with EN after supply voltage is within operation range. www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 15/16 2010.04 - Rev.C BD9150MUV ●Ordering part number Technical Note B D 9 Part No. 1 5 0 M U V - E 2 Part No. Package MUV: VQFN020V4040 Packaging and forming specification E2: Embossed tape and reel VQFN020V4040 4.0±0.1 Tape 4.0±0.1 Embossed carrier tape 2500pcs E2 The direction is the 1pin of product is at the upper left when you hold Quantity Direction of feed 1PIN MARK 1.0MAX S ( reel on the left hand and you pull out the tape on the right hand ) 0.08 S 2.1±0.1 0.5 1 20 16 15 11 5 6 10 C0.2 0.4±0.1 1.0 +0.05 0.25 -0.04 2.1±0.1 +0.03 0.02 -0.02 (0.22) 1pin (Unit : mm) Direction of feed Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com c ○ 2010 ROHM Co., Ltd. All rights reserved. 16/16 2010.04 - 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. The peripheral conditions must be taken into account when designing circuits for mass production. Great care was taken in ensuring the accuracy of the information specified in this document. However, should you incur any damage arising from any inaccuracy or misprint of such information, ROHM shall bear no responsibility for such damage. The technical information specified herein is intended only to show the typical functions of and examples of application circuits for the Products. ROHM does not grant you, explicitly or implicitly, any license to use or exercise intellectual property or other rights held by ROHM and other parties. ROHM shall bear no responsibility whatsoever for any dispute arising from the use of such technical information. The Products specified in this document are intended to be used with general-use electronic equipment or devices (such as audio visual equipment, office-automation equipment, communication devices, electronic appliances and amusement devices). The Products specified in this document are not designed to be radiation tolerant. While ROHM always makes efforts to enhance the quality and reliability of its Products, a Product may fail or malfunction for a variety of reasons. Please be sure to implement in your equipment using the Products safety measures to guard against the possibility of physical injury, fire or any other damage caused in the event of the failure of any Product, such as derating, redundancy, fire control and fail-safe designs. ROHM shall bear no responsibility whatsoever for your use of any Product outside of the prescribed scope or not in accordance with the instruction manual. The Products are not designed or manufactured to be used with any equipment, device or system which requires an extremely high level of reliability the failure or malfunction of which may result in a direct threat to human life or create a risk of human injury (such as a medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuelcontroller or other safety device). ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing. If you intend to export or ship overseas any Product or technology specified herein that may be controlled under the Foreign Exchange and the Foreign Trade Law, you will be required to obtain a license or permit under the Law. Thank you for your accessing to ROHM product informations. More detail product informations and catalogs are available, please contact us. ROHM Customer Support System http://www.rohm.com/contact/ www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. R1010A