BD9123MUV_12

D atasheet 2.7V to 5.5V, 1.2A 1ch Synchronous Buck Converter integrated FET BD9123MUV ●General Description ROHM’s high efficiency step-down switching regulator BD9123MUV is a power supply designed to produce a low voltage including 0.85 to 1.2 volts from 5.5/3.3 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 ■ Offers fast transient response with current mode PWM control system. ■ Offers highly efficiency for all load range with synchronous rectifier (Nch/Pch FET) and SLLM (Simple Light Load Mode) ■ Incorporates output voltage inside control function.(3 bit) ■ Incorporates PGOOD function. ■ Incorporates soft-start function. ■ Incorporates thermal protection and ULVO functions. ■ Incorporates short-current protection circuit with time delay function. ■ Incorporates shutdown function Icc=0µA(Typ.) ●Key Specifications  Input voltage range:  Output voltage range:  Output current:  Switching frequency:  Pch FET ON resistance:  Nch FET ON resistance:  Standby current:  Operating temperature range: ●Package VQFN016V3030: 2.7V to 5.5V 0.85V to 1.2V 1.2A (Max.) 1MHz(Typ.) 0.35Ω(Typ.) 0.25Ω(Typ.) 0μA (Typ.) -40℃ to +95℃ 3.00mm x 3.00mm x 1.00mm ●Applications Power supply for LSI including DSP, Micro computer and ASIC ●Typical Application Circuit VCC Cin EN VOUT VID VOUT VID 12 11 10 9 Datasheet EN 13 14 15 16 1 SW 8 (TOP VIEW) 7 6 5 2 SW ITH VCC PGOOD PVCC PVCC GND PGND 3 SW 4 PGND Fig.2 Pin Configuration ●Pin Description Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 ●Block Diagram VCC EN 13 VREF 14 PVCC 15 100Ω VCC 0.1µF Pin name SW Function Pch/Nch FET drain output pin PGND GND PGOOD ITH VOUT VID VID VID EN VCC PVCC Nch FET source pin Ground Power Good pin Gm Amp output pin/Connected phase compensation capacitor Output voltage pin Output voltage control pin Output voltage control pin Output voltage control pin Enable pin(High Active） VCC power supply input pin Pch FET source pin VID VID VID 12 11 10 Gm Amp SELECTOR Current Comp Input 10µF RQ S SLOPE CLK Current Sense/ Protect + Driver Logic 16 SW 4.7µH 1 2 3 Output VOUT VCC OSC 9 Soft Start Vcc UVLO 22µF PGND 4 5 6 GND 7 PGOOD PGOOD TSD 8 ITH RITH CITH Fig.3 Block Diagram www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 2/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV ●Absolute Maximum Ratings (Ta=25℃) Parameter VCC Voltage PVCC Voltage EN,SW,ITH Voltage Logic input voltage Power Dissipation 1 Power Dissipation 2 Power Dissipation 3 Power Dissipation 4 Operating temperature range Storage temperature range Maximum junction temperature *1 *2 *3 *4 *5 Datasheet Symbol Vcc PVcc EN, SW, ITH VID Pd1 Pd2 Pd3 Pd4 Topr Tstg Tj Ratings -0.3 to +7 * -0.3 to +7 * -0.3 to +7 -0.3 to +7 0.27 * 0.62 * 1.77 * 2.66 * 2 3 4 5 1 1 Unit V V V V W W W W ℃ ℃ ℃ -40 to +95 -55 to +150 +150 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, 1st and 4th copper foil area : 10.29mm2 , 2nd and 3rd copper foil area : 5505mm2 4-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 5505mm2, in each layers ●Operating Ratings (Ta=-40 to +95℃) Parameter Power Supply Voltage EN Voltage Logic input voltage Output voltage Setting Range SW average output current *6 Pd should not be exceeded. Symbol VCC PVCC VEN VID VOUT ISW Ratings Min. 2.7 2.7 0 0 0.85 Typ. 3.3 3.3 Max. 5.5 5.5 Vcc 5.5 1.2 1.2 *6 Unit V V V V V A ●Electrical Characteristics (Ta=25℃ VCC=PVCC=5V, EN=VCC, VID=VID=VID= 0V), unless otherwise specified.) Limits Parameter Symbol Unit Conditions Min. Typ. Max. Standby current Active current EN Low voltage EN High voltage EN input current VID Low voltage VID High voltage VID input current Oscillation frequency Pch FET ON resistance Nch FET ON resistance Output voltage ITH SInk current ITH Source Current UVLO threshold voltage UVLO release voltage Power Good Threshold Power Good Release Power Good Delay PGOOD ON Resistance Soft start time Timer latch time Output Short circuit threshold Voltage ISTB ICC VENL VENH IEN VVIDL VVIDH IVID FOSC RONP RONN VOUT ITHSI ITHSO VUVLO1 VUVLO2 VPGOOD1 VPGOOD2 TPG RONPG TSS TLATCH VSCP 2.0 2.0 0.8 0.98 25 25 2.4 2.425 70 85 2.5 0.4 1 0 10 300 500 GND 0.8 VCC 5 10 GND 0.8 VCC 5 10 1 1.2 0.35 0.60 0.25 0.50 1.0 1.02 50 50 2.5 2.6 2.55 2.7 75 80 90 95 5 10 140 280 0.8 1.6 2 4 VOUT×0.5 VOUT×0.7 µA µA V V µA V V µA MHz Ω Ω V µA µA V V % % ms Ω ms ms V EN=GND Standby mode Active mode VEN=5V VVID=5V PVCC=5V PVCC=5V VID=(0,0,0) VOUT =1.2V VOUT =0.8V VCC=5V→0V VCC=0V→5V VOUT→0V 0V→VOUT VOUT→0V www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 3/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV ●Typical Performance Curves Datasheet Fig.4 Vcc-VouT Fig.5 VEN - VOUT Fig.6 IOUT-VOUT Fig. 7 Ta-VOUT www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 4/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet Fig.8 Efficiency Fig.9 Power supply voltageOperating frequency Fig.10 Ta-Fosc Fig.11 Ta-RONN,RONP www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 5/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet Fig.12 Ta-VEN Fig.13 Ta-Icc Fig.14 Soft start waveform Fig.15 SW waveform Io=0mA www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 6/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet Fig.16 SW waveform Io=1.2A Fig.17 Transient Response Io=125mA→850mA(2µA) Fig.18 Transient Response Io=850mA→125mA(2µA) Fig.19 BIT CHANCE RESPONSE www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 7/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet Fig.20 BIT CHANCE RESPONSE Fig.21 PGOOD Delay www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 8/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet ●Application Information Operation BD9123MUV 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 Pch MOS FET (while a Nch 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 I L) 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 repeats 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 Curren t 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.22 Diagram of current mode PWM control Current Comp SET PVCC SENSE FB GND GND GND IL(AVE) SET Current Comp PVCC SENSE FB GND GND RESET SW IL RESET SW GND IL 0A VOUT VOUT(AVE) VOUT VOUT(AVE) Not switching Fig.23 PWM switching timing chart Fig.24 SLLM TM switching timing chart www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 9/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet 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. The inclination of standing up is different and the soft start time is different because of constancy depending o n the value offset output voltage. When 1V settiing it, it is Tss=1msec(Typ.) VCC,EN 1.2V 0.85V VOUT Tss Tss’ [ms] Fig.25 Soft start action ・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 0 µA(Typ.). ・UVLO function Detects whether the input voltage sufficient to secure the output voltage of this IC is supplied. of 50mV (Typ.) is provided to prevent output chattering. Hysteresis 50mV And the hysteresis width Vcc EN VOUT Tss Soft start Standby mode Operating mode UVLO Standby mode UVLO Tss Standby mode Tss Operating mode Operating mode Standby mode EN UVLO Fig.26 Soft start, Shutdown, UVLO timing chart ・PGOOD function When the output voltage falls below 75% (Typ.) of a set value, the PGOOD pin of Open -Drain is turned off. And the hysteresis width of 15% (Typ.) is provided to prevent output chattering. VOUT 90% The hysteresis width 75% TGP PGOOD Fig.27 PGOOD timing chart www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 10/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet About Setting the Output Voltage Output voltage shifts step by step as often as bit setting to control the overshoot/undershoot that happen when changing the setting value of output voltage. From the bit switching until output voltage reach to setting value, 8 steps (max) delay will occur. VID (0,0,1) (1,1,1) 1.2V VOUT 0.85V tVID (max)=0.06ms ⅰ) Switching 3 bit synchronously VID VID VID ⅲ) Switching the bit during counting V2D 2〉 〈 〈1〉 〈0〉 Count STOP VOUT Count STOP VOUT 5µs(max) About 10µs from bit switching About 10µs from bit switching ⅱ) Switching 3 bit with the time lag VID VID VID Count STOP VOUT About 10µs from switching the last bit Fig.28 Timing chart of setting the output voltage It is possible to set output voltage, shown the diagram 1 below, by setting VID to 0 or 1. VID terminal is set to VID=(0,0,0) originally by the pull down resistor with high impedance inside IC. By pulling up/ pulling down about 10kΩ, the original value is changeable optionally. Table of output voltage setting VID VID 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 VID 0 1 0 1 0 1 0 1 VOUT 1.0V 0.85V 0.9V 0.95V 1.05V 1.1V 1.15V 1.2V *After 10µs(max) from the bit change, VOUT change starts. *Requiring time for one step (50 mV shift) of VOUT is 5µs(max). *From the bit switching until output voltage reach to setting value, tVID(max)=0.06ms delay will occur. www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 11/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet ・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. VCC Output Short circuit Threshold Voltage VOUT IL Limit IL Output voltage OFF Latch t1 IRMS(max.) IOUT When Vcc=2×VOUT, IRMS= 2 IRMS= If VCC=5V, VOUT=1.2V, and IOUTmax.=1.2A, √ .2(5-1.2) 1 IRMS=1.2× =0.51 [ARMS] 5 Fig.36 Input capacitor A low ESR 10µF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency. www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 15/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV Datasheet 4. Determination of RITH, CITH that works as a phase compensator As the Current Mode Control is designed to limit a inductor cu rrent, 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.37 Open loop gain characteristics fp(Max.)= A Gain [dB] 0 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 0 Phase [deg] -90 Fig.38 Error amp phase compensation characteristics VCC VCC Cin EN VOUT VID VOUT VIDTerminal 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+ N N P+ N Transistor (NPN) Pin B C B E B P P+ N E C Pin B N Parasitic element 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 curr ent 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) 50mΩ 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 + t imer latch time), output short circuit protection will be activated and output will be latched OFF. When using an inductor over 50m Ω, be careful to ensure adequate margins for variation between external devices and this IC, including transient as well as s tatic characteristics. Furthermore, in any case, it is recommended to start up the output with EN after supply voltage is within operation range. Status of this document The Japanese version of this document is formal specification. A customer may use t his 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. www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 19/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 BD9123MUV ●Ordering Information Datasheet B D 9 1 2 3 M U V - E2 Packaging and forming specification E2: Embossed tape and reel Package MUV : VQFN016V3030 ●Physical Dimension Tape and Reel Information ●Marking Diagram VQFN016V3030 (TOP VIEW) Part Number Marking D91 2 3 LOT Number 1PIN MARK www.rohm.com © ROHM Co., Ltd. All rights reserved. TSZ22111･15･001 20/20 TSZ02201-0J3J0AJ00120-1-2 02.MAR.2012 Rev.001 Datasheet Datasheet Notice ●Precaution for circuit design 1) The products are designed and produced for application in ordinary electronic equipment (AV equipment, OA equipment, telecommunication equipment, home appliances, amusement equipment, etc.). If the products are to be used in devices requiring extremely high reliability (medical equipment, transport equipment, aircraft/spacecraft, nuclear power controllers, fuel controllers, car equipment including car accessories, safety devices, etc.) and whose malfunction or operational error may endanger human life and sufficient fail-safe measures, please consult with the ROHM sales staff in advance. If product malfunctions may result in serious damage, including that to human life, sufficient fail-safe measures must be taken, including the following: [a] Installation of protection circuits or other protective devices to improve system safety [b] Installation of redundant circuits in the case of single-circuit failure 2) The products are designed for use in a standard environment and not in any special environments. Application of the products in a special environment can deteriorate product performance. Accordingly, verification and confirmation of product performance, prior to use, is recommended if used under the following conditions: [a] Use in various types of liquid, including water, oils, chemicals, and organic solvents [b] Use outdoors where the products are exposed to direct sunlight, or in dusty places [c] Use in places where the products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [d] Use in places where the products are exposed to static electricity or electromagnetic waves [e] Use in proximity to heat-producing components, plastic cords, or other flammable items [f] Use involving sealing or coating the products with resin or other coating materials [g] Use involving unclean solder or use of water or water-soluble cleaning agents for cleaning after soldering [h] Use of the products in places subject to dew condensation The products are not radiation resistant. Verification and confirmation of performance characteristics of products, after on-board mounting, is advised. In particular, if a transient load (a large amount of load applied in a short period of time, such as pulse) is applied, confirmation of performance characteristics after on-board mounting is strongly recommended. Avoid applying power exceeding normal rated power; exceeding the power rating under steady-state loading condition may negatively affect product performance and reliability. De-rate Power Dissipation (Pd) depending on Ambient temperature (Ta). When used in sealed area, confirm the actual ambient temperature. Confirm that operation temperature is within the specified range described in product specification. Failure induced under deviant condition from what defined in the product specification cannot be guaranteed. 3) 4) 5) 6) 7) 8) ●Precaution for Mounting / Circuit board design 1) When a highly active halogenous (chlorine, bromine, etc.) flux is used, the remainder of flux may negatively affect product performance and reliability. 2) In principle, the reflow soldering method must be used; if flow soldering method is preferred, please consult with the Company in advance. Regarding Precaution for Mounting / Circuit board design, please specially refer to ROHM Mounting specification ●Precautions Regarding Application Examples and External Circuits 1) If change is made to the constant of an external circuit, allow a sufficient margin due to variations of the characteristics of the products and external components, including transient characteristics, as well as static characteristics. 2) The application examples, their constants, and other types of information contained herein are applicable only when the products are used in accordance with standard methods. Therefore, if mass production is intended, sufficient consideration to external conditions must be made. Notice - Rev.001 Datasheet Datasheet ●Precaution for Electrostatic This product is Electrostatic sensitive product, which may be damaged due to Electrostatic discharge. Please take proper caution during manufacturing and storing so that voltage exceeding Product maximum rating won't be applied to products. Please take special care under dry condition (e.g. Grounding of human body / equipment / solder iron, isolation from charged objects, setting of Ionizer, friction prevention and temperature / humidity control). ●Precaution for Storage / Transportation 1) Product performance and soldered connections may deteriorate if the products are stored in the following places: [a] Where the products are exposed to sea winds or corrosive gases, including Cl2, H2S, NH3, SO2, and NO2 [b] Where the temperature or humidity exceeds those recommended by the Company [c] Storage in direct sunshine or condensation [d] Storage in high Electrostatic 2) Even under ROHM recommended storage condition, solderability of products out of recommended storage time period may be degraded. It is strongly recommended to confirm solderability before using products of which storage time is exceeding recommended storage time period . Store / transport cartons in the correct direction, which is indicated on a carton as a symbol. Otherwise bent leads may occur due to excessive stress applied when dropping of a carton. Use products within the specified time after opening a dry bag. 3) 4) ●Precaution for product label QR code printed on ROHM product label is only for internal use, and please do not use at customer site. It might contain a internal part number that is inconsistent with an product part number. ●Precaution for disposition When disposing products please dispose them properly with a industry waste company. ●Precaution for Foreign exchange and Foreign trade act Since concerned goods might be fallen under controlled goods prescribed by Foreign exchange and Foreign trade act, please consult with ROHM in case of export. ●Prohibitions Regarding Industrial Property 1) Information and data on products, including application examples, contained in these specifications are simply for reference; the Company does not guarantee any industrial property rights, intellectual property rights, or any other rights of a third party regarding this information or data. Accordingly, the Company does not bear any responsibility for: [a] infringement of the intellectual property rights of a third party [b] any problems incurred by the use of the products listed herein. 2) The Company prohibits the purchaser of its products to exercise or use the intellectual property rights, industrial property rights, or any other rights that either belong to or are controlled by the Company, other than the right to use, sell, or dispose of the products. Notice - Rev.001