BD9123MUV

Single-chip Type with Built-in FET Switching Regulators Output 1.5A or Less High-efficiency Step-down Switching Regulator with Built-in Power MOSFET BD9123MUV No.11027EAT38 ●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 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) and SLLM (Simple Light Load Mode) 3) Incorporates output voltage inside control function.(3 bit) 4) Incorporates PGOOD function. 5) Incorporates soft-start function. 6) Incorporates thermal protection and ULVO functions. 7) Incorporates short-current protection circuit with time delay function. 8) Incorporates shutdown function Icc=0µA(Typ.) 9) Employs small surface mount package: VQFN016V3030 ●Applications Power supply for LSI including DSP, Micro computer and ASIC ●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 Symbol Vcc PVcc EN, SW, ITH VID Pd1 Pd2 Pd3 Pd4 Topr Tstg Tj Ratings -0.3～+7 *1 -0.3～+7 *1 -0.3～+7 -0.3～+7 0.27 *2 0.62 * 1.77 * 2.66 * 3 4 5 Unit V V V V W W W W ℃ ℃ ℃ -40～+95 -55～+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 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 1/17 2011.01 - Rev.A BD9123MUV ●Operating Conditions (Ta=-40～+95℃) Parameter Power Supply Voltage EN Voltage Logic input voltage Output voltage Setting Range SW average output current *6 Pd should not be exceeded. Technical Note 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 0 300 GND VCC 5 GND VCC 5 1 0.35 0.25 1.0 50 50 2.5 2.55 75 90 5 140 0.8 2 10 500 0.8 10 0.8 10 1.2 0.60 0.50 1.02 2.6 2.7 80 95 10 280 1.6 4 µA µA V V µA V V µA MHz Ω Ω V µA µA V V % % ms Ω ms ms V VOUT→0V PVCC=5V PVCC=5V VID=(0,0,0) VOUT =1.2V VOUT =0.8V VCC=5V→0V VCC=0V→5V VOUT→0V 0V→VOUT VVID=5V Standby mode Active mode VEN=5V EN=GND VOUT×0.5 VOUT×0.7 www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 2/17 2011.01 - Rev.A BD9123MUV ●Package outline, SYMBOLS 【BD9123MUV】 ●Block Diagram, Application Circuit VCC EN 13 D9 2 3 VID 12 VID 11 Lot No. Technical Note VCC 14 PVCC 15 16 Current Sense/ Protect + Driver Logic 0.1µF 100Ω 1 VREF Current Comp SELECTOR Input 10µF VID 10 Gm Amp VOUT 9 VCC RQ S SLOPE CLK 1 2 3 4 5 6 SW 4.7µH Output OSC Vcc Soft Start UVLO TSD 22µF PGND PGOOD 7 PGOOD GND 8 ITH RITH CITH VQFN016V3030 (Unit:mm) Fig.1 BD9123MUV Package outline ●Pin No. & function table Fig.2 BD9123MUV Block Diagram Pin No. VID VID VID VOUT Pin name SW Function Pch/Nch FET drain output pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 12 13 14 15 16 1 SW 11 10 9 8 7 6 5 ITH EN 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 VCC PGOOD PVCC GND PVCC PGND 2 SW 3 SW 4 PGND Fig 3 Top View www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 3/17 2011.01 - Rev.A BD9123MUV ●Characteristics data 2.0 2.0 2.0 Technical Note 【VOUT=1.0V】 OUTPUT VOLTAGE:VOUT[V] OUTPUT VOLTAGE:VOUT[V] 1.6 1.6 【VOUT=1.0V】 OUTPUT VOLTAGE:VOUT[V] 1.6 【VOUT=1.0V】 1.2 1.2 1.2 0.8 0.8 VCC=5V Io=0A Ta=25℃ 0.8 0.4 Io=1.2A Ta=25℃ 0.4 0.4 VCC=5V Ta=25℃ 0.0 0 1 2 3 4 INPUT VOLTAGE:VCC[V] 5 0.0 0 1 2 3 4 EN VOLTAGE:VEN[V] 5 0.0 0 1 2 3 4 EN VOLTAGE:VEN[V] 5 Fig.4 Vcc-VouT 1.04 100 Fig.5 VEN - VOUT 2.0 Fig.6 IOUT-VOUT 【VOUT=1.0V】 OUTPUT VOLTAGE:VOUT[V] 1.02 EFFICIENCY:?[%] 90 80 70 60 50 40 30 20 10 0 100 1 【VOUT=1.0】 FREQUENCY:FOSC[MHz] 1.5 1.00 1.0 0.98 0.5 VCC=5V Io=0A 0.96 -40 -20 0 20 40 60 80 INPUT VOLTAGE:VCC[V] Vcc=5.0V Ta=25℃ Ta=25℃ 0.0 10 100 Io [A] 1000 10000 2.7 3.4 4.1 4.8 INPUT VOLTAGE:VCC[V] 5.5 Fig. 7 Ta-VOUT 1200 1000 FREQUENCY:FOSC[kHz] ON RESISTANCE:RON[O] 800 600 400 200 175 150 125 100 75 50 Fig.8 Efficiency 2.0 Fig.9 Power supply voltageOperating frequency 1.9 1.8 EN VOLTAGE:VEN[V] 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 High side (PMOS FET) Low side (NMOS FET) VCC=5V 200 0 -40 -20 0 20 40 60 80 TEMPERATURE:Ta[℃] 100 VCC=5.0V 25 0 -40 -20 0 20 40 60 80 TEMPERATURE:Ta[℃] 100 VCC=5V -40 -20 0 20 40 60 80 TEMPERATURE:Ta[℃] 100 Fig.10 Ta-Fosc 400 350 ON RESISTANCE:RON[O] 300 250 200 150 100 50 0 -40 -20 0 20 40 60 80 TEMPERATURE:Ta[℃] 100 Fig.11 Ta-RONN,RONP Fig.12 Ta-VEN 【VOUT=1.0V】 【SLLM control VOUT=1.0V】 VCC=5V Io=0A Ta=25℃ SW SW VO VCC=5V VCC=5V Io=1.2A Ta=25℃ VO Fig.13 Ta-Icc Fig.14 Soft start waveform Fig.15 SW waveform Io=0mA www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 4/17 2011.01 - Rev.A BD9123MUV Technical Note SW VO Vo VO VCC=5V Io=1.2A Ta=25℃ IO Ta=25℃ Io Ta=25℃ Fig.16 SW waveform Io=1.2A Fig.17 Transient Response Io=125mA→850mA(2µA) VID[2:0]= (1,1,1)→0,0,1) Fig.18 Transient Response Io=850mA→125mA(2µA) VID[2:0]=(0,0,1)→(1,1,1) VID VID PGOOD 1.2V VO 0.85V VO 1.2V VOUT 0.85V 0.9V 0.75V TPG VCC=5V Vo=1V Ta=25℃ Fig.19 BIT CHANCE RESPONSE Fig.20 BIT CHANCE RESPONSE Fig.21 PGOOD Delay www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 5/17 2011.01 - Rev.A BD9123MUV ●Information on advantages Advantage 1: Offers fast transient response with current mode control system. Conventional product (Load response IO=0.1A→0.6A) Technical Note BD9123MUV (Load response IO=0.6A→0.1A) VOUT 27mV VOUT 37mV IOUT IOUT Fig.22 Comparison of transient 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 Pch side MOS FET : 0.35mΩ(Typ.) ON resistance of Nch side MOS FET : 0.25mΩ(Typ.) 100 Efficiency η[%] SLLM ② 50 ① PWM ①inprovement by SLLM system Achieves efficiency improvement for heavier load. Offers high efficiency for all load range with the improvements mentioned above. 0 0.001 ②improvement by synchronous rectifier 0.01 0.1 Output current Io[A] 1 Fig.23 Efficiency Advantage 3: ・Supplied in smaller package due to small-sized power MOS FET incorporated. ・Output capacitor Co required for current mode control: 10µF ceramic capacitor ・Inductance L required for the operating frequency of 1 MHz: 4.7µH inductor Reduces a mounting area required. VCC VCC 20mm Cin L Co L VOUT Co RITH CITH 15mm Rf Cf RPGOOD R PGOOD CIN DC/DC Convertor RITH CITH Fig.24 Example application www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 6/17 2011.01 - Rev.A BD9123MUV Technical Note ●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 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.25 Diagram of current mode PWM control Current Comp SET PVCC SENSE FB GND GND GND IL(AVE) Current Comp SET PVCC SENSE FB GND GND RESET SW IL RESET SW GND IL 0A VOUT VOUT(AVE) VOUT VOUT(AVE) Not switching Fig.26 PWM switching timing chart Fig.27 SLLM TM switching timing chart www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 7/17 2011.01 - Rev.A BD9123MUV 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. The inclination of standing up is different and the soft start time is different because of constancy depending on 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.28 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 0µA(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 UVLO Operating mode Standby mode UVLO Tss Standby mode EN Tss Operating mode Operating mode UVLO Standby mode Fig.29 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.30 PGOOD timing chart www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 8/17 2011.01 - Rev.A BD9123MUV Technical Note ●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.31 Timing chart of setting the output voltage It is possible to set output voltage, shown the diagram 1 below, by setting VID～ 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 © 2011 ROHM Co., Ltd. All rights reserved. 9/17 2011.01 - Rev.A BD9123MUV Technical Note ・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 Output voltage OFF UVLO t1 IRMS(max.) When Vcc=2×VOUT, IRMS= Fig.36 Input capacitor If VCC=5V, VOUT=1.2V, and IOUTmax.=1.2A, √ .2(5-1.2) 1 IRMS=1.2× =0.51 [ARMS] 5 A low ESR 10µF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 12/17 2011.01 - Rev.A BD9123MUV 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.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 P+ N Transistor (NPN) Pin B C B E B N C E Pin B N N Parasitic element P P+ 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) 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 + timer latch time), output short circuit protection will be activated and output will be latched OFF. When using an inductor over 50mΩ, 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 © 2011 ROHM Co., Ltd. All rights reserved. 16/17 2011.01 - Rev.A BD9123MUV ●Ordering part number Technical Note B D 9 Part No. 1 2 3 M U V - E 2 Part No. Package MUV : VQFN016V3030 Packaging and forming specification E2: Embossed tape and reel VQFN016V3030 3.0±0.1 3.0±0.1 Tape Quantity Direction of feed Embossed carrier tape 3000pcs E2 The direction is the 1pin of product is at the upper left when you hold 1PIN MARK 1.0MAX S +0.03 0.02 −0.02 (0.22) ( reel on the left hand and you pull out the tape on the right hand ) 0.08 S C0.2 0.4±0.1 1.4±0.1 0.5 1 4 5 8 12 9 16 13 0.75 +0.05 0.25 −0.04 1.4±0.1 1pin (Unit : mm) Reel Direction of feed ∗ Order quantity needs to be multiple of the minimum quantity. www.rohm.com © 2011 ROHM Co., Ltd. All rights reserved. 17/17 2011.01 - Rev.A 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 © 2011 ROHM Co., Ltd. All rights reserved. R1120A