High-efficiency Step-up Switching Regulator with Built-in Power MOSFET

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High-efficiency Step-up Switching Regulator with Built-in Power MOSFET

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Single-chip Type with Built-in Switching Regulator Series
High-efficiency Step-up Switching Regulator with Built-in Power MOSFET
BD8311NUV
No.09027EBT03
Description ROHM's High-efficiency Step-up Switching Regulator Built-in Power MOSFET BD8311NUV generates step-up output including from batteries, batteries such Li2cell etc. fixed power supply line. This allows easy production small wide range output current, equipped with external coil/capacitor downsized high frequency operation MHz, built-in rated flexible phase compensation system board.
Features Incorporates capable withstanding A/14 Incorporates phase compensation device between input output ERROR AMP. Small coils capacitors used high frequency operation Input voltage Output current (3.5 (3.5 Incorporates soft-start function. Incorporates timer latch system short protecting function. small 10-pin package VSON010V3030
Application General portable equipment like DSC/DVC powered batteries Li2cell
Operating Conditions 25°C) Parameter Power supply voltage Output voltage
Symbol VOUT
Voltage range
Unit
Absolute Maximum Ratings Parameter Maximum applied power voltage Maximum input voltage Maximum input current Power dissipation Operating temperature range Storage temperature range Junction temperature
Symbol VCC, SWOUT, Iinmax Topr Tstg Tjmax
Rating +150 +150
Unit
When used 25°C more installed 74.2 74.2 1.6t board, rating reduced mW/°C. These specifications subject change without advance notice modifications other reasons.
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1/14
2009.04 Rev.B
BD8311NUV
Electrical characteristics
Technical Note
Parameter
Symbol
Target Value 4.65 0.99 -0.3 1.00 5.35 1.01 12.2
Unit
Conditions
[Low voltage input malfunction preventing circuit] Detection threshold voltage Hysteresis range [Oscillator] Oscillation frequency [Regulator] Output voltage [ERROR AMP] threshold voltage Input bias current Soft-start time [PWM comparator] Duty [SWOUT] resistance [Output] NMOS resistance leak current [STB] control voltage [Circuit current] Standby current
Circuit current operation
designed resistant radiation
VUVhy fosc VREG VINV IINV Dmax1 RONSWOUT Ileak
msec
VREG monitor
VCC=11.0V VINV=5.5V
Operation No-operation
VSTBH VSTBL RSTB ISTB
pull-down resistance
VINV=1.2V
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2/14
2009.04 Rev.B
BD8311NUV
Electrical characteristics
Technical Note
Parameter
Symbol
Target Value 4.65 0.99 -0.3 1.00 5.35 1.01 12.2
Unit
Conditions
[Low voltage input malfunction preventing circuit] Detection threshold voltage Hysteresis range [Oscillator] Oscillation frequency [Regulator] Output voltage [ERROR AMP] threshold voltage Input bias current Soft-start time [PWM comparator] Duty [SWOUT] resistance [Output] NMOS resistance leak current [STB] control voltage [Circuit current] Standby current
Circuit current operation
designed resistant radiation
VUVhy fosc VREG VINV IINV Dmax1 RONSWOUT Ileak
msec
VREG monitor
Vcc=11.0V VINV=5.5V
Operation No-operation
VSTBH VSTBL RSTB ISTB
pull-down resistance
VINV=1.2V
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3/15
2009.04 Rev.B
BD8311NUV
Description Pins
Technical Note
VREG SWOUT PGND PGND Fig.1 layout
Name VREG PGND SWOUT Ground terminal
Function
Control part power input terminal output terminal regulator internal circuit Coil connecting terminal Power transistor ground terminal ON/OFF terminal ERROR input terminal STBSW split resistance
Block Diagram
VREG
STBY_IO VREG
1.2MHz
Reference
VREF
UVLO
ount VREG
STOP
CONTROL
DRIVER
PGND
ERROR_AMP
VREF Soft Start
SWOUT
Fig.2 Block diagram
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4/15
2009.04 Rev.B
BD8311NUV
Description Blocks VREF This block generates ERROR reference voltage. reference voltage
Technical Note
UVLO Circuit preventing voltage malfunction Prevents malfunction internal circuit activation power supply voltage power supply voltage. Monitors voltage turn output DC/DC converter output when voltage lower than reset timer latch internal circuit soft-start circuit. This threshold contains hysteresis. Timer latch system short-circuit protection circuit When lower voltage, internal circuit starts counting. internal counter synch with OSC; latch circuit activates after lapse 13.3 msec after counter counts about 16000 oscillations then, turn DC/DC converter output. reset latch circuit, turn once. Then, turn again turn power supply voltage again. Circuit oscillating sawtooth waves with operation frequency fixed ERROR Error amplifier detecting output signals outputting control signals internal reference voltage primary phase compensation device built between inverting input terminal output terminal this ERROR AMP. COMP Voltage-pulse width converter controlling output voltage corresponding input voltage Comparing internal SLOPE waveform with ERROR output voltage, COMP controls pulse width output driver. Duty 85%. SOFT START Circuit preventing in-rush current startup bringing output voltage DC/DC converter into soft-start Soft-start time synch with internal OSC, output voltage DC/DC converter reaches voltage after about 10000 oscillations
DRIVER CMOS inverter circuit driving built-in FET. STBY_IO Voltage applied pin) control ON/OFF Turned when voltage higher applied turned when terminal open applied. Incorporates approximately pull-down resistance. Built-in switching coil current DC/DC converter. Incorporates NchFET capable withstanding Since current rating this should used within including current ripple current coil.
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5/15
2009.04 Rev.B
BD8311NUV
Reference Data (Unless otherwise specified, 25°C,
Technical Note
1.02
1.02
1.01 1.01
THRESHOLD
VREG VOLTAGE
THRESHOLD
1.00
1.00
0.99
0.99
0.98 TEMPERATURE
0.98
TEMPERATURE
Fig.3. threshold temperature property
Fig.4. threshold power supply property
Fig.5. VREG output temperature property
FREQUENCY [MHz]
FREQUENCY
VREG[V]
TEMPERATURE
Fig.6. VREG output power supply property
Fig.7. fosc temperature property
Fig.8. fosc voltage property
UVLO THRESHOLD VOLTAGE TEMPARATURE
UVLO detection UVLO release
0.25
0.20
Hysteresis Voltage Vhys[V] Vhys
ID=500mA
ID=500mA
RESISTANCE
RESISTANCE
Hysteresis width
0.15
0.10
0.05
0.00
TEMPARATURE
Fig.9. UVLO threshold temperature property
Fig.10. resistance temperature
Fig.11. resistance power supply
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6/15
2009.04 Rev.B
BD8311NUV
Technical Note
SWOUT Resistance
ID=1mA
SWOUT Resistance
ID=1mA
Voltage
TEMPARATURE
Fig.12. threshold temperature
Fig.13. SWOUT resistance temperature property
Fig.14. SWOUT resistance power supply property
Duty
Duty
Voltage
TEMPARATURE
TEMPARATURE
Fig.15. duty temperature property
Fig.16. duty power supply property
Fig.17. Circuit current temperature property
1000
[uA]
Fig.18. Circuit current power supply property
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7/15
2009.04 Rev.B
BD8311NUV
Example Application
10V/500mA
Technical Note
Input: output: 10.1
RSX201L-30 (ROHM)
22µF GRM32EB31C226KE16( Murata) 4.7µH DE3518E( TOKO)
ON/OFF
PGND
GRM188B11A105KA61( Murata)
VBAT=2.5~ 4.5V
PGND
10µF GRM31CB31E106KA75L( Murata)
200k
VREG
100k
GRM21BB11C105KA01( Murata)
3.3~ 5.0V
SWOUT
Fig.19 Reference application diagram
Reference Application Data
VCC=10V
VCC=6.0V EFFICIENCY
VCC=4.0V
EFFICIENCY
EFFICIENCY
VCC=8.4V
VCC=7.4V
VCC=4.8V
VCC=3.5V
1000 10000
1000 10000
1000 10000
OUTPUT CURRENT [mA]
OUTPUT CURRENT [mA]
OUTPUT CURRENT [mA]
Fig.20 Power conversion efficiency
10.5 10.4
Fig.21 Power conversion efficiency
10.5 10.4
Fig.22 Power conversion efficiency
Io=100mA
OUTPUT VOLTAGE
10.3 10.2 10.1 10.0
VCC=10V
OUTPUT VOLTAGE
10.3 10.2 10.1 10.0
OUTPUT VOLTAGE
VCC=8.4V
VCC=4.8V
Io=500mA
VCC=7.4V VCC=6.0V
VCC=4.0V VCC=3.5V
1000
10000
1000
10000
Fig.23 Line regulation
INPUT VOLTAGE
Fig.24 Load regulation
OUTPUT CURRENT [mA]
Fig.25 Load regulation
OUTPUT CURRENT [mA]
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8/15
2009.04 Rev.B
BD8311NUV
Reference Application Data (VCC VOUT
Technical Note
Gain [dB]
1000 10000 Gain
Phase [deg] Gain [dB] -120 -180 100k 100000 1000000
1000 10000 Gain
-120 -180 100k 100000 1000000 Phase [deg]
Phase [deg]
Phase
Gain [dB] Phase [deg]
Phase
Phase
Gain
-120 -180 100k 100000 1000000
1000
10000
[Hz] Frequency [Hz]
Fig.26 Frequency response property (VCC
Phase Gain [dB] 1000 10000 100k 100000 [Hz] Frequency [Hz] Phase [deg] -120 -180 1000000 100k
[Hz] Frequency [Hz]
Frequency [Hz] [Hz]
Fig.27 Frequency response property (VCC
Gain [dB] Phase [deg]
Fig.28 Frequency response property (VCC
Gain [dB] 1000 10000 100k 100000 Gain -120 -180 1000000
Phase
Phase
Gain
-120 -180 1000000
Gain
1000
10000
100k 100000
Frequency[Hz] [Hz]
Frequency [Hz] [Hz]
Fig.29 Frequency response property (VCC Reference Board Pattern
Fig.30 Frequency response property (VCC
Fig.31 Frequency response property (VCC
VOUT
VBAT
radiation plate rear should flat surface impedance common with PGND flat surface. recommended install another system shown drawing without connecting directly this PGND
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9/15
2009.04 Rev.B
BD8311NUV
Selection Part Applications Inductor shielded inductor that satisfies current rating (current value, Ipecac shown drawing below) (direct resistance component) recommended. Inductor values affect inductor ripple current, which will cause output ripple. Ripple current reduced coil value becomes larger switching frequency becomes higher. Ipeak =Iout IL/2
Technical Note
Fig.32 Inductor current
Vout -Vin Vout
Efficiency, Output ripple current, Switching frequency) guide, inductor ripple current should about maximum input current. Current over coil rating flowing coil brings coil into magnetic saturation, which lead lower efficiency output oscillation. Select inductor with adequate margin that peak current does exceed rated current coil.
Output capacitor ceramic capacitor with recommended output order reduce output ripple. There must adequate margin between maximum rating output voltage capacitor, taking bias property into consideration. Output ripple voltage obtained following equation. Vpp=Iout Vout-Vin Iout RESR
Setting must performed that output ripple within allowable ripple voltage.
Output voltage setting internal reference voltage ERROR Output voltage obtained Equation Fig. should designed taking about error NMOS resistance SWOUT into consideration.
VOUT ERROR
(R1+R2)
VREF 1.0V SWOUT
Fig.33 Setting voltage feedback resistance
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10/15
2009.04 Rev.B
BD8311NUV
DC/DC converter frequency response adjustment system
Technical Note
Condition stable application condition feedback system stability under negative feedback that phase delay less when gain dB). Since DC/DC converter application sampled according switching frequency, bandwidth whole system (frequency which gain must controlled equal lower than 1/10 switching frequency. summary, conditions necessary DC/DC converter are: Phase delay must 135°or lower when gain dB). Bandwidth (frequency when gain must equal lower than 1/10 switching frequency. satisfy above items, Fig. should follows.
BD8311NUV incorporates phase compensation devices R4=62 C2=200pF. These values decide prim pole that determines bandwidth DC/DC converter. Primary pole point frequency DC/DC converter Gain
Gain
VOUT Inside
R1R2 R1+R2
Fig.34 Example phase compensation setting ERROR Gain About 100dB Oscillator amplification Input voltage VIN: VOUT: Output voltage
VOUT VOUT-VIN
Equations (2), frequency point under limitation bandwidth gain primary pole point shown below.
(R1R2) (R1+R2)
Gain
VOUT VOUT-VIN
recommended that should approx.10 kHz. When load response difficult, approx. kHz. this setting, which determine voltage value, will order several hundred Therefore, appropriate resistance value available routing cause noise, enables easy setting.
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11/15
2009.04 Rev.B
BD8311NUV
Technical Note
setting step-up DC/DC converter, secondary pole point caused coil capacitor expressed following equation. 2(LC)
fLC=
Duty VOUT VOUT
This secondary pole causes phase rotation 180°. secure stability system, zero points places perform compensation. Zero point built-in fZ1= 2R4C2 Zero point fZ1= 2(R1+R3)CS 13kHz
Setting half times frequency large provides appropriate phase margin. desirable about 1/20 (R1+R3) cancel phase boosting high frequencies. Those pole points summarized figure below. actual frequency property different from ideal calculation because part constants. possible, check phase margin with frequency analyzer network analyzer, etc. Otherwise, check presence absence ringing load response waveform also check presence absence oscillation under load adequate margin.
Fig. Example DC/DC converter frequency property (Measured with FRA5097 Corporation)
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12/15
2009.04 Rev.B
BD8311NUV
Equivalence Circuit
Technical Note
VREG
VREG
VREG
VREG
SWOUT
VREG
SWOUT
PGND
PGND
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13/15
2009.04 Rev.B
BD8311NUV
Technical Note
Notes Absolute Maximum Rating dedicate much attention quality control these products, however possibility deterioration destruction exists impressed voltage, operating temperature range, etc., exceed absolute maximum ratings. addition, impossible predict destructive situations such short-circuit modes, open circuit modes, etc. special mode exceeding absolute maximum rating expected, please review matters provide physical safety means such fuses, etc. Potential Keep potential below minimum potential times. Thermal Design Work thermal design with sufficient margin taking power dissipation (Pd) actual operation condition into account. Short Circuit between Pins Incorrect Mounting Attention direction displacement required when installing PCB. installed wrong way, break. Also, threat destruction from short-circuits exists foreign matter invades between outputs output power supply. Operation under Strong Electromagnetic Field careful possible malfunctions under strong electromagnetic fields. Common Impedance When providing power supply wirings, show sufficient consideration lowering common impedance reducing ripple (i.e., using thick short wiring, cutting ripple down etc.) much can. Thermal Protection Circuit (TSD Circuit) This contains thermal protection circuit (TSD circuit). circuit serves shut from thermal runaway does protect assure operation itself. Therefore, circuit continuous operation after circuit tripped. Rush Current Time Power Activation careful power supply coupling capacity width power supply pattern wiring routing since rush current flows instantaneously time power activation case CMOS with multiple power supplies.
Terminal Input
This monolithic isolation substrate element isolation between each element. junctions formed various parasitic elements configured using these layers layers individual elements. example, resistor transistor connected terminal shown Fig.36: junction operates parasitic diode when (Terminal case resistor when (Pin case transistor (NPN) Also, parasitic transistor operates using layer another element adjacent previous diode case transistor (NPN) when (Pin parasitic element consequently rises under potential relationship because IC's structure. parasitic element pulls interference that could cause malfunctions destruction circuit. Therefore, caution avoid operation parasitic elements caused applying voltage input terminal lower than board), etc.
Resistor (Pin (Pin
Transistor (NPN)
Substrate
Parasitic Element
Parasitic Element
Substrate
Parasitic Element
Fig.36 Example simple structure Bipolar
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14/15
2009.04 Rev.B
(Pin
BD8311NUV
Ordering part number
Technical Note
Part
Part
Package NUV: VSON010V3030
Packaging forming specification Embossed tape reel
VSON010V3030 <Dimension>
<Tape Reel information>
Tape Quantity Direction feed
Embossed 3000pcs
carrier
1PIN MARK
1.0MAX
(The direction 1pin product upper left when hold reel left hand pull tape right hand)
0.08
C0.25
0.02 0.02 (0.22)
0.03
1234
1234
1234
1234
1234
1234
0.25 0.05 0.04
Reel
1Pin
Direction feed
(Unit:mm)
When order please order times amount package quantity.
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15/15
2009.04 Rev.B
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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High-efficiency Step-up Switching Regulator with Built-in Power MOSFET

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