Output More High-efficiency Step-down Switching Regulator with Built-i

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Output More High-efficiency Step-down Switching Regulator with Built-i

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Single-chip Type with Built-in Switching Regulator Series
Output More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
BD9141MUV
No.09027EAT37
Description ROHM's high efficiency step-down switching regulator BD9141MUV power supply designed produce voltage including 5.0/3.3 volts from lithium cell power supply line. Offers high efficiency with original pulse skip control technology synchronous rectifier. Employs current mode control system provide faster transient response sudden change load. Features Offers fast transient response with current mode control system. Offers highly efficiency load range with synchronous rectifier (Nch/Pch FET) SLLM (Simple Light Load Mode) Incorporates soft-start function. Incorporates thermal protection ULVO functions. Incorporates short-current protection circuit with time delay function. Incorporates shutdown function Employs small surface mount package VQFN020V4040 Applications Power supply including DSP, Micro computer ASIC Line matrix Parameter Voltage PVCC Voltage Voltage SW,ITH Voltage,VREG Power Dissipation Power Dissipation Power Dissipation Power Dissipation Operating temperature range Storage temperature range Maximum junction temperature
Symbol PVCC VSW,VITH, VREG Topr Tstg Tjmax
Limits BD9141MUV -0.3+15 -0.3+15 -0.3+15 -0.3+15 0.342 0.703 2.21 3.56 -40+105 -55+150 +150
Unit
should exceeded. only. layer, mounted board Glass-epoxy (Copper foil area 10.29mm layers, mounted board Glass-epoxy Copper foil area 10.29mm Copper foil area 5505mm layers, mounted board Glass-epoxy (Copper foil area 5505mm copper foil each layers.
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1/18
2009.06 Rev.A
BD9141MUV
Operating Conditions (Ta=-40+105) Parameter Voltage PVCC Voltage Voltage average output current Output voltage Setting Range
Technical Note
Symbol PVCC VOUT*7
Min. 4.5*7 4.5*7
BD9141MUV Typ.
Unit Max. 13.2 13.2
should exceeded. VccMin. Vout 1.3V.
Electrical Characteristics BD9141MUV (Ta=25, VCC=PVCC=8.0V, EN=VCC, R1=8.2k, R2=43k, unless otherwise specified.) Parameter Symbol Min. Typ. Max. Unit Conditions Standby current ISTB EN=GND Bias current voltage VENL Standby mode High voltage VENH Active mode input current VEN=8V Oscillation frequency FOSC resistance RONP PVCC=8V resistance RONN PVCC=8V Voltage VADJ 0.788 0.800 0.812 SInk current ITHSI VADJ=1.0V Source Current ITHSO VADJ=0.6V UVLO threshold voltage VUVLO1 3.90 4.10 4.30 VCC=8V0V UVLO release voltage VUVLO2 3.95 4.20 4.50 VCC=0V8V Soft start time Timer latch time TLATCH SCP/TSD operated Output Short circuit 0.56 VADJ=0.8V0V VSCP Threshold Voltage
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2/18
2009.06 Rev.A
BD9141MUV
Block Diagram, Application Circuit
Technical Note
BD9141MUV
VREG VREF Input Current Comp PVCC Current Sense/ Protect Amp. SLOPE Soft Start UVLO PGND
+0.05
4.0±0.1
4.0±0.1
D9141
0.8V
1.0Max.
Driver Logic
Output
0.08
C0.2 2.1±0.1
0.4±0.1
2.1±0.1
0.02 +0.03 -0.02 (0.22)
RITH CITH
0.25 -0.04 Fig.1 BD9141MUV View
Fig.2 BD9141MUV Block Diagram function table 1,2,3,4,5 6,7,8 15,16 18,19,20 Name PVCC N.C. VREG N.C. PGND BD9141MUV Function Pch/Nch drain output source connection power supply input Ground Output voltage detect GmAmp output pin/Connected phase compensation capacitor Reference Voltage connection Enable pin(Active High) source
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3/18
2009.06 Rev.A
BD9141MUV
Characteristics dataBD9141MUV
Technical Note
VOUT=5V
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
VOUT=5V
OUTPUT VOLTAGE:VOUT[V]
Ta=25 Io=2A
VCC=8V Ta=25 Io=0A
VOLTAGE:VEN[V]
VOUT=5V
OUTPUT CURRENT:IOUT[A] VCC=8V Fig.5 IOUT-VOUT
VCC=8V Ta=25
INPUT VOLTAGE:VCC[V]
Fig.3 VCC-VOUT
5.20
OUTPUT VOLTAGE:VOUT[V]
Fig.4 VEN-VOUT
EFFICIENCY:[%] 1000 OUTPUT CURRENT:IOUT[mA] 10000
5.05 5.00 4.95 4.90 4.85 4.80
VOUT=5V VCC=8V Ta=25
FREQUENCY:FOSC[kHz]
VOUT=5V VCC=8V 5.10 Io=0A
5.15
VCC=8V
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig. Ta-VOUT
Fig.7 Efficiency
Fig.8 Ta-FOSC
RESISTANCE:RON[]
CIRCUIT CURRENT:I CC[A]
VCC=8V PMOS
RESISTANCE:RON[]
VCC=8V
VCC=8V
NMOS
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.9 Ta-RONN, RONP
TEMPERATURE:Ta[]
Fig.10 Ta-VEN
Fig.11 Ta-Icc
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4/18
2009.06 Rev.A
BD9141MUV
Technical Note
VCC=PVCC
VOUT=5V
SLLM control
VOUT=5V
FREQUENCY:FOSC[kHz]
Ta=25
INPUT VOLTAGE:VCC[V]
VOUT
VOUT VCC=8V Ta=25 Io=0A
VCC=8V Ta=25 Io=0A
Fig.12 VCC-FOSC
Fig.13 Soft start waveform Fig.14 waveform Io=10mA
control
VOUT=5V VOUT
VOUT=5V VOUT
VOUT
IOUT
IOUT
VCC=8V Ta=25
VCC=8V Ta=25
VCC=8V Ta=25
Fig.15 waveform Io=2000mA
Fig. 16Transient response Io=0.5A1A(10s)
Fig.17 Transient response Io=1A0.5A(10s)
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5/18
2009.06 Rev.A
BD9141MUV
Information advantages Advantage 1Offers fast transient response with current mode control system. Conventional product (Load response IO=0.5A1A)
Technical Note
BD9141MUV (Load response IO=0.5A1A)
VOUT 110mV
VOUT 50mV
IOUT
IOUT
Voltage drop sudden change load reduced about 50%. Fig.18 Comparison transient response Advantage Offers high efficiency load range. lighter load: Utilizes current mode control mode called SLLM lighter load, which reduces various dissipation such switching dissipation (PSW), gate charge/discharge dissipation, dissipation output capacitor (PESR) on-resistance dissipation (PRON) that otherwise cause degradation efficiency lighter load.
Achieves efficiency improvement lighter load. heavier load: Utilizes synchronous rectifying mode on-resistance FETs incorporated power transistor. resistance P-channel 150m(Typ.) resistance N-channel 80m(Typ.)
Efficiency SLLM
improvement SLLM system improvement synchronous rectifier
Achieves efficiency improvement heavier load. Offers high efficiency load range with improvements mentioned above.
0.001
0.01 Output current Io[A]
Fig.19 Efficiency
Advantage 3Supplied smaller package small-sized power incorporated. Output capacitor required current mode control: ceramic capacitor Inductance required operating frequency 1MHz: 2.2H inductor (BD9141MUV:Co=22F, L=4.7H) Reduces mounting area required.
15mm DC/DC Convertor Controller RITH CITH RITH VOUT 10mm CITH
Fig.20 Example application
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6/18
2009.06 Rev.A
BD9141MUV
Technical Note
Operation BD9141MUV synchronous rectifying step-down switching regulator that achieves faster transient response employing current mode control system. utilizes switching operation (Pulse Width Modulation) mode heavier load, while utilizes SLLM (Simple Light Load Mode) operation lighter load improve efficiency. Synchronous rectifier does require power dissipated rectifier externally connected conventional DC/DC converter junction shoot-through protection circuit limits shoot-through current during operation, which power dissipation reduced. Current mode control Synthesizes control signal with inductor current feedback loop added voltage feedback. (Pulse Width Modulation) control oscillation frequency 500kHz. signal form turns P-channel (while N-channel turned OFF), inductor current increases. current comparator (Current Comp) receives signals, current feedback control signal (SENSE: Voltage converted from voltage feedback control signal (FB), issues RESET signal both input signals identical each other, turns P-channel (while N-channel turned rest fixed period. control repeat this operation. SLLM (Simple Light Load Mode) control When control mode shifted from heavier load lighter load vise versa, switching pulse designed turn with device held operated normal control loop, which allows linear operation without voltage drop deterioration transient response during mode switching from light load heavy load vise versa. Although control loop continues operate with signal from RESET signal from Current Comp, designed that RESET signal held issued shifted light load mode, with which switching tuned switching pulses thinned under control. Activating switching intermittently reduces switching dissipation improves efficiency.
SENSE Current Comp RESET Level Shift Amp. Driver Logic Load VOUT
VOUT
Fig.21 Diagram current mode control
Current Comp PVCC SENSE IL(AVE) Current Comp PVCC SENSE
RESET
RESET
VOUT
VOUT(AVE)
VOUT
VOUT(AVE)
Fig.22 switching timing chart
Fig.23 SLLM
switching
switching timing chart
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7/18
2009.06 Rev.A
BD9141MUV
Description operations Soft-start function
Technical Note
terminal shifted "High" activates soft-starter gradually establish output voltage with current limited during startup, which possible prevent overshoot output voltage inrush current. Shutdown function With terminal shifted "Low", device turns Standby Mode, function blocks including reference voltage circuit, internal oscillator drivers turned OFF. Circuit current during standby (Typ.). UVLO function Detects whether input voltage sufficient secure output voltage this supplied. hysteresis width 100mV (Typ.) provided prevent output chattering.
Hysteresis 100mV
VOUT
Soft start Standby mode Operating mode Standby mode
Operating mode
Standby mode
Operating mode
Standby mode
UVLO
UVLO
UVLO
Fig.24 Soft start, Shutdown, UVLO timing chart
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8/18
2009.06 Rev.A
BD9141MUV
Technical Note
Short-current protection circuit with time delay function Turns output protect from breakdown when incorporated current limiter activated continuously fixed time(TLATCH) more. output thus held tuned recovered restarting re-unlocking UVLO.
Output latch
Output Short circuit Threshold Voltage VOUT Limit
Standby mode
t1<TLATCH Operating mode
t2=TLATCH
Standby mode
Operating mode
Timer latch
Fig.25 Short-current protection circuit with time delay timing chart
Switching regulator efficiency Efficiency expressed equation shown below: POUT POUT POUT+PD
Efficiency improved reducing switching regulator power dissipation factors follows: Dissipation factors: resistance dissipation inductor FETPD(I Gate charge/discharge dissipationPD(Gate) Switching dissipationPD(SW) dissipation capacitorPD(ESR) Operating current dissipation ICPD(IC)
1)PD(I R)=IOUT (RCOIL[]DC resistance inductor, RON[]ON resistance FET, IOUT[A]Output current.) (Cgs[F]Gate capacitance FET, f[H]Switching frequency, V[V]Gate driving voltage FET) 3)PD(SW)= (CRSS[F]Reverse transfer capacitance FET, IDRIVE[A]Peak current gate.) IDRIVE 4)PD(ESR)=IRMS (IRMS[A]Ripple current capacitor, ESR[]Equivalent series resistance.) (ICC[A]Circuit current.)
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9/18
2009.06 Rev.A
BD9141MUV
Technical Note
Consideration permissible dissipation heat generation this functions with high efficiency without significant heat generation most applications, special consideration needed permissible dissipation heat generation. case extreme conditions, however, including lower input voltage, higher output voltage, heavier load, and/or higher temperature, permissible dissipation and/or heat generation must carefully considered. dissipation, only conduction losses resistance inductor resistance considered. Because conduction losses considered play leading role among other dissipation mentioned above including gate charge/discharge dissipation switching dissipation.
3.56W
Power dissipation:Pd
layers (Copper foil area 5505mm copper foil each layers. j-a=35.1/W layers (Copper foil area 10.29m copper foil each layers. j-a=56.6/W layers (Copper foil area 10.29m j-a=178.6/W only. j-a=367.6/W
P=IOUT
2.21W
duty (=VOUT/VCC) RCOILDC resistance coil RONPON resistance P-channel RONNON resistance N-channel IOUTOutput current
0.70W 0.34W
100105 Ambient temperature:Ta
Fig.26 Thermal derating curve (VQFN020V4040)
VCC=8V, VOUT=5V, RONP=0.15, RONN=0.08 IOUT=2A, example, D=VOUT/VCC=5/8=0.625 =0.09375+0.03 =0.12375[]
RONP greater than RONN this dissipation increases duty becomes greater. With consideration dissipation above, thermal design must carried with sufficient margin allowed.
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10/18
2009.06 Rev.A
BD9141MUV
Selection components externally connected Selection inductor
Technical Note
inductance significantly depends output ripple current. seen equation (1), ripple current decreases inductor and/or switching frequency increases. [A](1)
Appropriate ripple current output should more less maximum output current.
VOUT
[A](2) [H](3)
Fig.27 Output ripple current
(IL: Output ripple current, Switching frequency)
*Current exceeding current rating inductor results magnetic saturation inductor, which decreases efficiency. inductor must selected allowing sufficient margin with which peak current exceed current rating. VCC=3.3V, VOUT=1.8V, f=1MHz, example,(BD9141MUV)
=6.25 6.3[H]
*Select inductor resistance component (such ACR) minimize dissipation inductor better efficiency.
Selection output capacitor (CO)
Output capacitor should selected with consideration stability region equivalent series resistance required smooth ripple voltage.
Output ripple voltage determined equation
VOUT
[V](4) (IL: Output ripple current, ESR: Equivalent series resistance output capacitor)
*Rating capacitor should determined allowing sufficient margin against output voltage. 100F ceramic capacitor recommended. Less allows reduction output ripple voltage.
Fig.28 Output capacitor
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11/18
2009.06 Rev.A
BD9141MUV
Technical Note
Selection input capacitor (Cin)
Input capacitor select must capacitor capacitance sufficient cope with high ripple current prevent high transient voltage. ripple current IRMS given equation (5):
VOUT
OUT(VCC-VOUT) [A](5) IOUT
Worst case IRMS(max.) VCC=8V, VOUT=5V, IOUTmax.=2A, (BD9140MUV) 5(8-5) =0.97[ARMS] When twice VOUT, IRMS=
Fig.29 Input capacitor
22F/25V ceramic capacitor recommended reduce dissipation input capacitor better efficiency.
Determination RITH, CITH that works phase compensator Current Mode Control designed limit inductor current, pole (phase lag) appears frequency area filter consisting output capacitor load resistance, while zero (phase lead) appears high frequency area output capacitor ESR. phases easily compensated adding zero power amplifier output with described below cancel pole power amplifier.
fp(Min.) Gain [dB] fp(Max.) fz(ESR) IOUTMin. IOUTMax.
fz(ESR)= Pole power amplifier When output current decreases, load resistance increases pole frequency lowers. fp(Min.)= [Hz]with lighter load [Hz] with heavier load
Phase [deg]
Fig.30 Open loop gain characteristics fp(Max.)=
Gain [dB] Phase [deg]
fz(Amp.)
Zero power amplifier
Increasing capacitance output capacitor lowers pole frequency while zero frequency does change. reduces half.) (This because when capacitance doubled, capacitor
fz(Amp.)= Fig.31 Error phase compensation characteristics
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12/18
2009.06 Rev.A
BD9141MUV
Technical Note
VOUT VOUT RITH CITH
VCC,PVCC
VOUT
GND,PGND
Fig.32 Typical application
Stable feedback loop achieved canceling pole (Min.) produced output capacitor load resistance with zero correction error amplifier.
fz(Amp.)= fp(Min.)
Determination output voltage output voltage VOUT determined equation (6): VADJ: Voltage terminal (0.8V Typ.) With adjusted, output voltage determined required.
Output
Adjustable output voltage range 2.5V6.0V
Fig.33 Determination output voltage
k100 resistor resistance more than 100kor they have range between setting value output voltage input voltage.
Vo=6.0V minimum input voltage depends setting output voltage. Basically, recommended condition VCCmin VOUT+1.3V. shown necessary output current value minimum input voltage. (DCR inductor 0.1)See Fig.34. This data characteristic value, doesn't guarantee operation range.
INPUT VOLTAGE VCC[V]
Vo=5.0V
Vo=4.0V Vo=3.3V
6.Selection reference voltage capacitor (CVREG) VREG voltage reference voltage created Input voltage (Vcc Voltage). CVREG capacitor should selected 0.1uF more.
OUTPUT CURRENT IOUT[A]
Fig.34 minimum input voltage each output voltage
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13/18
2009.06 Rev.A
BD9141MUV
BD9141MUV Cautions Board layout VREG CVREG RITH CITH PGND
Technical Note
PVCC VOUT
Fig.34 Layout diagram sections drawn with heavy line, thick conductor pattern short possible. input ceramic capacitor closer pins PVCC PGND, output capacitor closer PGND. CITH RITH between pins neat possible with least necessary wiring. connection must left open connected GND. VQFN020V4040 (BD9141MUV) thermal reverse package. package thermal performance enhanced bonding plane which take large area PCB. Recommended components Lists above application Symbol CVREG CITH RITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor Ceramic capacitor Resistance Vo=5V Vo=3.3V Vo=5V Part Value 4.7uH 22uF 22uF 0.1uF Vo=3.3V 1000pF 1000pF Manufacturer kyocera kyocera murata murata murata Rohm Rohm Series RLF7030T-4R7M3R4 CM32X5R226M25A CM32X5R226M10A GRM188B31H104KA92 GRM1882C1H102JA01 GRM1882C1H102JA01 MCR03 Series MCR03 Series
*The parts list presented above example recommended parts. Although parts sound, actual circuit characteristics should checked your application carefully before use. sure allow sufficient margins accommodate variations between external devices this when employing depicted circuit with other circuit constants modified. Both static transient characteristics should considered establishing these margins. When switching noise substantial impact system, pass filter should inserted between PVCC pins, schottky barrier diode established between PGND pins.
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14/18
2009.06 Rev.A
BD9141MUV
equivalence circuit BD9141MUV
PVCC PVCC PVCC
Technical Note
VREG
VREG
Fig.35 equivalence circuit
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15/18
2009.06 Rev.A
BD9141MUV
Cautions
Technical Note
Absolute Maximum Ratings While utmost care taken quality control this product, application that exceed some absolute maximum ratings including voltage applied operating temperature range result breakage. broken, short-mode open-mode identified. expected encounter with special mode that exceed absolute maximum ratings, requested take necessary safety measures physically including insertion fuses. Electrical potential must designed have lowest electrical potential operating conditions. Short-circuiting between terminals, mismounting When mounting board, care must taken avoid mistake orientation alignment. Failure result breakdown. Short-circuiting foreign matters entered between output terminals, between output power supply also cause breakdown. 4.Operation Strong electromagnetic field noted that using strong electromagnetic radiation cause operation failures. Thermal shutdown protection circuit Thermal shutdown protection circuit circuit designed isolate from thermal runaway, intended protect guarantee thermal shutdown protection circuit which once activated should used thereafter operation originally intended. Inspection with board capacitor must connected lower impedance during inspection with board, capacitor must discharged after each process avoid stress electrostatic protection, provide proper grounding assembling processes with special care taken handling storage. When connecting jigs inspection process, sure turn power supply before connected removed. Input terminals This monolithic with isolation between P-substrate each element illustrated below. This P-layer N-layer each element form junction, various parasitic element formed.
resistor joined transistor terminal shown
junction works parasitic diode following relationship satisfied; GND>Terminal resistor side), GND>Terminal transistor side); GND>Terminal transistor side), parasitic transistor activated N-layer other element adjacent above-mentioned parasitic diode. structure inevitably forms parasitic elements, activation which cause interference among circuits, and/or malfunctions contributing breakdown. therefore requested take care device such manner that voltage lower than P-substrate) applied input terminal, which result activation parasitic elements.
Resistor
Transistor (NPN)
Parasitic element
substrate Parasitic element
substrate Parasitic element
Parasitic Other adjacent elements
Fig.36 Simplified structure monorisic
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16/18
2009.06 Rev.A
BD9141MUV
Technical Note
Ground wiring pattern small-signal large-current provided, will recommended separate large-current pattern from small-signal pattern establish single ground reference point that resistance wiring pattern voltage fluctuations large current will cause fluctuations voltages small-signal GND. attention cause fluctuations wiring pattern external parts well.
Selection inductor recommended inductor with series resistance element (DCR) less. When using inductor over 0.1, careful ensure adequate margins variation between external devices this including transient well static characteristics. Furthermore, case, recommended start output with after supply voltage within operation range.
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17/18
2009.06 Rev.A
BD9141MUV
Ordering part number
Technical Note
Type
Package
ROHM part number
Package specification
Embossed taping
Adjustable (2.56V)
VQFN020V4040
VQFN020V4040
4.0±0.1
4.0±0.1
<Tape Reel information>
Tape Quantity Direction feed Embossed carrier tape 2500pcs
direction 1pin product upper left when hold
1PIN MARK
1.0MAX
(0.22)
reel left hand pull tape right hand
0.08
2.1±0.1
C0.2
0.4±0.1
+0.05 0.25 -0.04
2.1±0.1
+0.03 0.02 -0.02
1pin
Direction feed
(Unit
Reel
Order quantity needs multiple minimum quantity.
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18/18
2009.06 Rev.A
Notice
Notes
copying reproduction this document, part whole, permitted without consent ROHM Co.,Ltd. content specified herein subject change improvement without notice. content specified herein purpose introducing ROHM's products (hereinafter "Products"). wish such Product, please sure refer specifications, which obtained from ROHM upon request. Examples application circuits, circuit constants other information contained herein illustrate standard usage operations Products. peripheral conditions must taken into account when designing circuits mass production. Great care taken ensuring accuracy information specified this document. However, should incur damage arising from inaccuracy misprint such information, ROHM shall bear responsibility such damage. technical information specified herein intended only show typical functions examples application circuits Products. ROHM does grant you, explicitly implicitly, license exercise intellectual property other rights held ROHM other parties. ROHM shall bear responsibility whatsoever dispute arising from such technical information. Products specified this document intended used with general-use electronic equipment devices (such audio visual equipment, office-automation equipment, communication devices, electronic appliances amusement devices). Products specified this document designed radiation tolerant. While ROHM always makes efforts enhance quality reliability Products, Product fail malfunction variety reasons. Please sure implement your equipment using Products safety measures guard against possibility physical injury, fire other damage caused event failure Product, such derating, redundancy, fire control fail-safe designs. ROHM shall bear responsibility whatsoever your Product outside prescribed scope accordance with instruction manual. Products designed manufactured used with equipment, device system which requires extremely high level reliability failure malfunction which result direct threat human life create risk human injury (such medical instrument, transportation equipment, aerospace machinery, nuclear-reactor controller, fuel-controller other safety device). ROHM shall bear responsibility Products above special purposes. Product intended used such special purpose, please contact ROHM sales representative before purchasing. intend export ship overseas Product technology specified herein that controlled under Foreign Exchange Foreign Trade Law, will required obtain license permit under Law.
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Output More High-efficiency Step-down Switching Regulator with Built-i

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