BD8960NV-E2

Single-chip Type with Built-in FET Switching Regulators Low Noise High Efficiency Step-down Switching Regulator with Built-in Power MOSFET BD8960NV No.10027EBT21 ●Description ROHM’s high efficiency step-down switching regulator BD8960NV is a power supply designed to produce a low voltage including 1 volts from 5.5/3.3 volts power supply line. Offers high efficiency with 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 (Nch/Pch FET) 3) Incorporates soft-start function. 4) Incorporates thermal protection and ULVO functions. 5) Incorporates short-current protection circuit with time delay function. 6) Incorporates shutdown function 7) Employs small surface mount package : SON008V5060 ●Applications Power supply for LSI including DSP, Micro computer and ASIC ●Line up Parameter VCC Voltage PVCC Voltage EN Voltage SW,ITH Voltage Power Dissipation 1 Power Dissipation 2 Operating temperature range Storage temperature range Maximum junction temperature ＊1 ＊2 ＊3 Symbol VCC PVCC VEN VSW,VITH Pd1 Pd2 Topr Tstg Tjmax Limits -0.3～+7 -0.3～+7 ＊1 ＊1 Unit V V V V mW mW ℃ ℃ ℃ -0.3～+7 -0.3～+7 900＊2 3900＊3 -25 ~ +105 -5 ~ +150 +150 Pd should not be exceeded. Derating in done 7.2mW/℃ for temperatures above Ta=25℃, Mounted on 70mm×70mm×1.6mm Glass Epoxy PCB. Derating in done 31.2mW/℃ for temperatures above Ta=25℃, Mounted on JESD51-7. ●Operating Conditions (Ta=25℃) Parameter VCC Voltage PVCC Voltage EN Voltage SW average output current Output voltage Setting Range ＊4 ＊5 Symbol VCC *4 PVCC VEN Isw *4 *4 Limits Min. 2.7 *5 2.7 *5 0 1.0 Typ. 3.3 3.3 Max. 5.5 5.5 VCC 2.0 2.5 Unit V V V A V VOUT Pd should not be exceeded. In case set output voltage 1.6V or more, VccMin. = Vout + 1.3V. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 1/14 2010.04 - Rev.B BD8960NV ●Electrical Characteristics ◎(Ta=25℃, VCC=PVCC=3.3V, EN=VCC, R1=10k Parameter Standby current Bias current EN Low voltage EN High voltage EN input current Oscillation frequency Pch FET ON resistance Nch FET ON resistance ADJ Voltage Output voltage ITH SInk current ITH Source Current UVLO threshold voltage UVLO release voltage Soft start time Timer latch time Output Short circuit Threshold Voltage Ω, R2=5kΩ, unless otherwise specified.) Technical Note Symbol ISTB ICC VENL VENH IEN FOSC RONP RONN VADJ VOUT ITHSI ITHSO VUVLO1 VUVLO2 TSS TLATCH VSCP Min. 2.0 0.8 0.788 10 10 2.400 2.425 0.5 1 - Limits Typ. 0 250 GND VCC 1 1 200 160 0.800 1.200 20 20 2.500 2.550 1 2 VOUT×0.5 Unit Max. 10 400 0.8 10 1.2 400 350 0.812 2.600 2.700 2 3 VOUT×0.7 μA μA V V μA MHz mΩ mΩ V V μA μA V V ms ms VOUT Conditions EN=GND Standby mode Active mode VEN=3.3V PVCC=3.3V PVCC=3.3V VADJ=1.0V VADJ=0.6V VCC=3→0V VCC=0→3V SCP/TSD operated VOUT=1.2→0V ●Block Diagram, Application Circuit VCC EN 8 2 VCC Input D8960 Lot No. VREF Current Comp RQ S Gm Amp. SLOPE OSC VCC Soft Start UVLO TSD SCP 1 ADJ 3 CLK TOP View Current Sense/ Protect + Driver Logic 7 PVCC Output 6 SW 5 PGND 4 GND ITH CITH RITH R1 R2 Fig.1 BD8960NV TOP View ●Pin No. & function table Pin No. Pin name 1 ADJ 2 VCC 3 ITH 4 GND 5 PGND 6 SW 7 PVCC 8 EN Fig.2 BD8960NV Block Diagram PIN function Output voltage detect pin VCC power supply input pin GmAmp output pin/Connected phase compensation capacitor Ground Nch FET source pin Pch/Nch FET drain output pin Pch FET source pin Enable pin(Active High) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 2/14 2010.04 - Rev.B BD8960NV ●Characteristics data (Reference data) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 1 2 3 4 INPUT VOLTAGE:VCC[V] 5 2.0 Technical Note 3.0 OUTPUT VOLTAGE:VOUT[V] OUTPUT VOLTAGE:VOUT[V] 1.5 OUTPUT VOLTAGE:VOUT[V] 【VOUT=2.5V】 Ta=25℃ Io=0A 【VOUT=1.8V】 2.5 2.0 1.5 1.0 0.5 0.0 1.0 【VOUT=1.8V】 Ta=25℃ Io=2A 0.5 VCC=3.3V Ta=25℃ Io=0A 0 1 2 3 EN VOLTAGE:VEN[V] 4 5 【VOUT=2.5V】 VCC=5V Ta=25℃ 【VOUT=1.8V】 VCC=3.3V Ta=25℃ 5 0.0 0 1 2 3 4 OUTPUT CURRENT:IOUT[A] Fig.3 Vcc-Vout Fig.4 Ven-Vout Fig.5 Iout-Vout 1.85 1.84 OUTPUT VOLTAGE:VOUT[V] 100 1.20 1.15 【VOUT=1.8V】 VCC=3.3V Io=0A 90 VCC=3.3V EFFICIENCY:η[%] 1.82 1.81 1.80 1.79 1.78 1.77 1.76 1.75 -25 70 60 50 40 30 20 10 0 10 【VOUT=1.2V】 VCC=3.3V Ta=25℃ FREQUENCY:FOSC[MHz] 10000 1.83 80 1.10 1.05 1.00 0.95 0.90 0.85 0 25 50 75 100 TEMPERATURE:Ta[℃] 100 1000 OU TPU T C U R R EN T:IO U T [mA] 0.80 -25 0 25 50 75 TEMPERATURE:Ta[℃] 100 Fig. 6 Ta-VOUT Fig.7 Efficiency Fig.8 Ta-FOSC 0.40 0.35 ON RESISTANCE:R ON [Ω] 2.0 300 VCC=3.3V 1.8 1.6 EN VOLTAGE:VEN[V] VCC=3.3V CIRCUIT CURRENT:I CC [μA] 270 240 210 180 150 120 90 60 30 VCC=3.3V 0.30 0.25 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 PMOS 0.20 0.15 0.10 0.05 0.00 -25 0 25 50 75 TEMPERATURE:Ta[℃] 100 NMOS -25 0 25 50 75 TEMPERATURE:Ta[℃] 100 0 -25 0 25 50 75 TEMPERATURE:Ta[℃] 100 Fig.9 Ta-RONN, RONP Fig.10 Ta-VEN Fig.11 Ta-ICC www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 3/14 2010.04 - Rev.B BD8960NV ●Characteristics data (Reference data) – Continued Technical Note 1.2 Ta=25℃ FREQUENCY:FOSC[MHz] 【VOUT=1.8V】 VCC=PVCC =EN SW [VOUT=1.8V】 1.1 1 0.9 VOUT VCC=3.3V Ta=25℃ Io=0A 3.1 3.5 3.9 4.3 4.7 INPUT VOLTAGE:VCC [V] 5.1 5.5 VOUT VCC=3.3V Ta=25℃ 0.8 2.7 Fig.12 Vcc-Fosc Fig.13 Soft start waveform Fig.14 SW waveform Io=10mA VOUT 【VOUT=1.8V】 VOUT 【VOUT=1.8V】 IOUT IOUT VCC=3.3V Ta=25℃ VCC=3.3V Ta=25℃ Fig. 15 Transient response Io=1A→2A(10μs) Fig.16 Transient response Io=2A→1A(10μs) www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 4/14 2010.04 - Rev.B BD8960NV ●Information on advantages Advantage 1：Offers fast transient response with current mode control system. Conventional product (Load response IO=0.1A→0.6A) VOUT VOUT 110mV Technical Note BD8960NV (Load response IO=1A→2A) 29mV IOUT IOUT Voltage drop due to sudden change in load was reduced by about 50%. Fig.17 Comparison of transient response Advantage 2： Offers high efficiency with synchronous rectifier Utilizes the synchronous rectifying mode and the low on-resistance MOS FETs incorporated as power transistor. EFFICIENCY:η[%] 100 90 80 ON resistance of P-channel MOS FET : 200mΩ(Typ.) ON resistance of N-channel MOS FET : 160mΩ(Typ.) 70 60 50 40 30 20 10 0 10 【VOUT=1.2V】 VCC=3.3V Ta=25℃ 100 1000 OU TPU T C U R R EN T:IO U T [mA] 10000 Fig.18 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 Reduces a mounting area required. VCC 15mm Cin CIN DC/DC Convertor Controller RITH L VOUT Co 10mm CITH CO L RITH CITH Fig.19 Example application www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 5/14 2010.04 - Rev.B BD8960NV Technical Note ●Operation BD8960NV is a synchronous rectifying step-down switching regulator that achieves faster transient response by employing current mode PWM control system. ○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 P-channel MOS FET (while a N-channel 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 P-channel MOS FET (while a N-channel MOS FET is turned ON) for the rest of the fixed period. The PWM control repeat this operation. SENSE Current Comp RESET Level Shift Gm Amp. ITH OSC RQ FB SET S Driver Logic SW Load IL VOUT VOUT Fig.20 Diagram of current mode PWM control Current Comp SET PVCC SENSE FB GND GND GND IL(AVE) Current Comp SET RESET SW IL RESET SW VOUT VOUT(AVE) VOUT Fig.21 PWM switching timing chart www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 6/14 2010.04 - Rev.B BD8960NV 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 50mV (Typ.) is provided to prevent output chattering. Hysteresis 50mV VCC EN VOUT Tss Soft start Standby mode Operating mode Standby mode UVLO Tss Tss Operating mode Standby mode EN Operating mode Standby mode UVLO UVLO Fig.22 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. EN Output OFF latch Output Short circuit Threshold Voltage VOUT IL Limit IL Standby mode t1 IRMS(max.) 2 If VCC=3.3V, VOUT=1.8V, and IOUTmax.=2A, (BD8960NV) IRMS=2× √ (3.3-1.8) 1.8 3.3 =0.99[ARMS] When Vcc is twice the VOUT, IRMS= Fig.27 Input capacitor A low ESR 22μF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 9/14 2010.04 - Rev.B BD8960NV 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] 0 IOUTMin. 0 fp(Max.) fz(ESR) 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 2π×ROMax.×CO 1 2π×ROMin.×CO [Hz]←with lighter load Phase [deg] -90 Fig.28 Open loop gain characteristics fp(Max.)= [Hz] ←with heavier load A Gain [dB] 0 0 -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 Phase [deg] Fig.29 Error amp phase compensation characteristics VCC Cin EN VOUT VOUT ITH RITH CITH VCC,PVCC L SW ESR RO VOUT GND,PGND CO Fig.30 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 © 2010 ROHM Co., Ltd. All rights reserved. 10/14 2010.04 - Rev.B BD8960NV 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. L SW 1 ADJ Technical Note 6 Output Co R2 Adjustable output voltage range : 1.0V～2.5V R1 Fig.31 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. 3.9 INPUT VOLTAGE : VCC[V] The lower limit of input voltage depends on the output voltage. Basically, it is recommended to use in the condition : VCCmin = VOUT+1.3V. Fig.32. shows the necessary output current value at the lower limit of input voltage. (DCR of inductor : 0.1Ω) This data is the characteristic value, so it’ doesn’t guarantee the operation range, 3.7 3.5 3.3 Vo=2.5V 3.1 Vo=1.8V Vo=2.0V 2.9 2.7 0 0.5 1 1.5 2 OUTPUT CURRENT : IOUT[A] Fig.32 minimum input voltage in each output voltage ●BD8960NV Cautions on PC Board layout VCC R2 1 R1 2 3 RITH ③ CITH 4 ADJ VCC ITH GND EN PVCC SW PGND 8 7 6 5 L CIN ② Co ① VOUT EN GND Fig.33 Layout diagram ①For the sections drawn with heavy line, use thick conductor pattern as short as possible. ②Lay out the input ceramic capacitor CIN closer to the pins PVCC and PGND, and the output capacitor Co closer to the pin PGND. ③Lay out CITH and RITH between the pins ITH and GND as neat as possible with least necessary wiring. * SON008V5060 (BD8960NV) has thermal FIN on the reverse of the package. The package thermal performance may be enhanced by bonding the FIN to GND plane which take a large area of PCB. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 11/14 2010.04 - Rev.B BD8960NV ●Recommended components Lists on above application Symbol L CIN CO Coil Ceramic capacitor Ceramic capacitor Part Value 2.2µH 22µF 22µF VOUT=1.0V VOUT=1.2V CITH Ceramic capacitor VOUT=1.5V VOUT=1.8V VOUT=2.5V VOUT=1.0V VOUT=1.2V RITH Resistance VOUT=1.5V VOUT=1.8V VOUT=2.5V 680pF 560pF 470pF 330pF 330pF 10kΩ 12kΩ 15kΩ 18kΩ 18kΩ Manufacturer TDK Kyocera Kyocera murata murata murata murata murata Rohm Rohm Rohm Rohm Rohm Technical Note Series LTF5022-2R2N3R2 CM32X5R226M10A CM316B226M06A GMR18 Serise GMR18 Serise GMR18 Serise GMR18 Serise GMR18 Serise MCR03 Serise MCR03 Serise MCR03 Serise MCR03 Serise MCR03 Serise * 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 established between the SW and PGND pins. ●I/O equivalence circuit ・EN pin ・SW pin PVCC PVCC PVCC EN SW ・ADJ pin ・ITH pin VCC ADJ ITH Fig.34 I/O equivalence circuit www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 12/14 2010.04 - Rev.B BD8960NV Technical Note ●Notes of 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.Operation in Strong electromagnetic field Be noted that using the IC in the strong electromagnetic radiation can cause operation failures. 5. 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. 6. 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. 7. 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 35. ○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 + Transistor (NPN) Pin B C B E B P P + Pin B N P P + N N Parasitic element N P+ N N C E P substrate Parasitic element GND P substrate Parasitic element GND GND GND Parasitic element Other adjacent elements Fig.35 Simplified structure of monorisic IC 8. 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. 9 . 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 © 2010 ROHM Co., Ltd. All rights reserved. 13/14 2010.04 - Rev.B BD8960NV ●Ordering part number Technical Note B D 8 Part No. 9 6 0 N V - E 2 Part No. Package NV : SON008V5060 Packaging and forming specification E2: Embossed tape and reel SON008V5060 5.0 ± 0.15 6.0 ± 0.15 Tape Quantity Direction of feed Embossed carrier tape 2000pcs E2 The direction is the 1pin of product is at the upper left when you hold 1.0MAX 1PIN MARK +0.03 0.02 -0.02 (0.22) S ( reel on the left hand and you pull out the tape on the right hand ) 0.08 S C0.25 0.8 ± 0.1 4.2 ± 0.1 1.27 1 23 4 3.6 ± 0.1 8 7 6 5 0.59 +0.05 0.4 -0.04 1pin Direction of feed (Unit : mm) Reel ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2010 ROHM Co., Ltd. All rights reserved. 14/14 2010.04 - Rev.B 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. 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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