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High-efficiency Step-down Switching Regulators with Built-in Power MOS


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Single-chip built-in type Switching Regulator Series
High-efficiency Step-down Switching Regulators with Built-in Power MOSFET
No.09027EAT33
Description ROHM's high efficiency step-down switching regulators power supply designed produce voltage including volts from 5/3.3 volts 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 MSOP8 HSON8 (BD9120HFN), SON008V5060 (BD9110NV) Power supply including DSP, Micro computer ASIC Line Parameter Input Voltage Output Voltage Output Current UVLO threshold Voltage Short-current protection with time delay function Soft start function Standby current Operating Temperature Range Package Operating Conditions (Ta=25) Parameter voltage PVCC voltage voltage average output current
should exceeded.
BD9106FVM 4.05.5V Adjustable (1.02.5V) 0.8A Max. 3.4V Typ.
BD9107FVM 4.05.5V Adjustable (1.01.8V) 1.2A Max. 2.7V Typ.
BD9109FVM 4.55.5V 3.30±2% 0.8A Max. 3.8V Typ. built-in built-in Typ.
BD9110NV 4.55.5V Adjustable (1.02.5V) 2.0A Max. 3.7V Typ.
BD9120HFN 2.74.5V Adjustable (1.01.5V) 0.8A Max. 2.5V Typ.
-25+85
-25+85 MSOP8
-25+85
-25+105 SON008V5060
-25+85 HSON8
Symbol PVCC
BD9106FVM Min. Max.
BD9107FVM Min. Max.
BD9109FVM Min. Max.
BD9110NV Min. Max.
BD9120HFN Min. Max.
Unit
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2009.05 Rev.A
Absolute Maximum Rating (Ta=25) Parameter voltage PVCC voltage voltage SW,ITH voltage Power dissipation Power dissipation Operating temperature range Storage temperature range Maximum junction temperature
Technical Note
Symbol PVCC SW,ITH Topr Tstg Tjmax
BD910FVM -0.3+7 -0.3+7 -0.3+7 -0.3+7 387.5*3 587.4*4 -25+85 -55+150 +150
Limits BD9110NV -0.3+7 -0.3+7 -0.3+7 -0.3+7 900*5 3900*6 -25+105 -55+150 +150
BD9120HFN -0.3+7 -0.3+7 -0.3+7 -0.3+7 1350*7 1750*8 -25+85 -55+150 +150
Unit
should exceeded. Derating done 3.1mW/ temperatures above Ta=25. Derating done 4.7mW/ temperatures above Ta=25, Mounted Glass Epoxy PCB. Derating done 7.2mW/ temperatures above Ta=25, Mounted Glass Epoxy which layer (3%) copper back side). Derating done 31.2mW/ temperatures above Ta=25, Mounted board according JESD51-7. Derating done 10.8mW/ temperatures above Ta=25, Mounted Glass Epoxy which layer (7%) copper back side). Derating done 14mW/ temperatures above Ta=25, Mounted Glass Epoxy which layer (65%) copper back side).
Electrical Characteristics BD9106FVM (Ta=25, VCC=5V, EN=VCC, R1=20k, R2=10k unless otherwise specified.) Parameter Symbol Min. Typ. Max. Unit Standby current ISTB Bias current voltage VENL High voltage VENH input current Oscillation frequency FOSC resistance RONP 0.35 0.60 resistance RONN 0.25 0.50 Voltage VADJ 0.780 0.800 0.820 Output voltage VOUT 1.200 SInk current ITHSI Source Current ITHSO UVLO threshold voltage VUVLOTh UVLO hysteresis voltage VUVLOHys Soft start time Timer latch time TLATCH
Design GuaranteeOutgoing inspection done products
Conditions EN=GND Standby mode Active mode VEN=5V PVCC=5V PVCC=5V
ADJ=H ADJ=L VCC=HL
BD9107FVM (Ta=25, VCC=5V, EN=VCC, R1=20k, R2=10k unless otherwise specified.) Parameter Symbol Min. Typ. Max. Unit Standby current ISTB Bias current voltage VENL High voltage VENH input current Oscillation frequency FOSC resistance RONP 0.35 0.60 resistance RONN 0.25 0.50 Voltage VADJ 0.780 0.800 0.820 Output voltage VOUT 1.200 SInk current ITHSI Source Current ITHSO UVLO threshold voltage VUVLOTh UVLO hysteresis voltage VUVLOHys Soft start time Timer latch time TLATCH
Design GuaranteeOutgoing inspection done products
Conditions EN=GND Standby mode Active mode VEN=5V PVCC=5V PVCC=5V
VOUT VOUT VCC=HL
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2009.05 Rev.A
Electrical Characteristics BD9109FVM (Ta=25, VCC=PVCC=5V, unless otherwise specified.) Parameter Symbol Min. Typ. Max. Standby current ISTB Bias current voltage VENL High voltage VENH input current Oscillation frequency FOSC resistance RONP 0.35 0.60 resistance RONN 0.25 0.50 Output voltage VOUT 3.234 3.300 3.366 SInk current ITHSI Source Current ITHSO UVLO threshold voltage VUVLO1 UVLO hysteresis voltage VUVLO2 3.65 Soft start time Timer latch time TLATCH Output Short circuit VSCP Threshold Voltage
Design GuaranteeOutgoing inspection done products
Technical Note
Unit
Conditions EN=GND Standby mode Active mode VEN=5V PVCC=5V PVCC=5V VOUT VOUT VCC=HL VCC=LH SCP/TSD operated VOUT
BD9110NV (Ta=25, VCC=PVCC=5V, EN=VCC, R1=10k,R2=5k unless otherwise specified.) Parameter Symbol Min. Typ. Max. Unit Standby current ISTB Bias current voltage VENL High voltage VENH input current Oscillation frequency FOSC resistance RONP resistance RONN Voltage VADJ 0.780 0.800 0.820 Output voltage VOUT 1.200 SInk current ITHSI Source Current ITHSO UVLO threshold voltage VUVLOTh UVLO hysteresis voltage VUVLOHys Soft start time Timer latch time TLATCH
Design GuaranteeOutgoing inspection done products
Conditions EN=GND Standby mode Active mode VEN=5V PVCC=5V PVCC=5V
VOUT VOUT VCC=HL
BD9120HFN (Ta=25, VCC=PVCC=3.3V, EN=VCC, R1=20k, R2=10k 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=3.3V Oscillation frequency FOSC resistance RONP 0.35 0.60 PVCC=3.3V resistance RONN 0.25 0.50 PVCC=3.3V Voltage VADJ 0.780 0.800 0.820 Output voltage VOUT 1.200 SInk current ITHSI VOUT Source Current ITHSO VOUT UVLO threshold voltage VUVLO1 2.400 2.500 2.600 VCC=HL UVLO hysteresis voltage VUVLO2 2.425 2.550 2.700 VCC=LH Soft start time Timer latch time TLATCH SCP/TSD operated Output Short circuit VOUT VSCP Threshold Voltage
Design GuaranteeOutgoing inspection done products
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2009.05 Rev.A
Characteristics dataBD9106FVM
Technical Note
VOUT=1.8V
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.8V
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.8V
OUTPUT VOLTAGE:VOUT[V]
Ta=25 Io=0A
VCC=5V Ta=25 Io=0A
VCC=5V Ta=25
INPUT VOLTAGE:VCC[V]
VOLTAGE:VEN[V]
OUTPUT CURRENT:IOUT
Fig.1 Vcc-Vout
Fig.2 Ven-Vout
Fig.3 Iout-Vout
1.85 1.84
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.8V
EFFICIENCY:[%]
1.20
VOUT=1.8V
FREQUENCY:FOSC[MHz]
1.83 1.82 1.81 1.80 1.79 1.78 1.77 1.76 1.75
VCC=5V Io=0A
1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
VCC=5V
VCC=5V Ta=25
OUTPUT CURRENT:IOUT[mA] 1000
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.4 Ta-Vout
Fig.5 Efficiency
Fig.6 Ta-Fosc
0.40 0.35
VOLTAGE:VEN[V]
VCC=5V
CIRCUIT CURRENT:I
VCC=5V
0.30 0.25 0.20 0.15 0.10 0.05 0.00
PMOS
RESISTANCE:R
NMOS
VCC=5V
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.7 Ta-Ronn, Ronp
Fig.8 Ta-Ven
Fig.9 Ta-Icc
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2009.05 Rev.A
Technical Note
FREQUENCY:FOSC[MHz]
VCC=PVCC
VOUT=1.8V
SLLM control
VOUT=1.8V
VOUT VCC=5V Ta=25 Io=0A
INPUT VOLTAGE:VCC
VOUT VCC=5V Ta=25
Fig.10 Vcc-Fosc
Fig.11 Soft start waveform
Fig.12 waveform Io=10mA
control
VOUT=1.8V VOUT
VOUT=1.8V VOUT
VOUT=1.8V
VOUT VCC=5V Ta=25
IOUT VCC=5V Ta=25
IOUT VCC=5V Ta=25
Fig.13 waveform Io=200mA
Fig. Transient response Io=100600mA(10s)
Fig.15 Transient response Io=600100mA(10s)
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2009.05 Rev.A
Characteristics dataBD9107FVM
Technical Note
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.5V Ta=25 Io=0A
VOUT=1.5V
VOUT=1.5V
VCC=5V Ta=25
VCC=5V Ta=25 Io=0A
VOLTAGE:VEN[V]
INPUT VOLTAGE:VCC[V]
OUTPUT CURRENT:IOUT
Fig.16 Vcc-Vout
Fig.17 Ven-Vout
Fig.18 Iout-Vout
1.55 1.54
OUTPUT VOLTAGE:VOUT[V]
FREQUENCY:FOSC[MHz]
1.53 1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45
VOUT=1.5V VCC=5V Io=0A
EFFICIENCY:[%]
1.20
VOUT=1.5V
1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
VCC=5V
VCC=5V Ta=25
1000 OUTPUT CURRENT:IOUT[mA] 10000
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.19 Ta-Vout
Fig.20 Efficiency
Fig.21 Ta-Fosc
0.40 0.35
RESISTANCE:RON[]
CIRCUIT CURRENT:ICC[A]
VCC=5V
VOLTAGE:VEN[V]
0.30 0.25 0.20 0.15 0.10 0.05 0.00
PMOS
VCC=5V
NMOS VCC=5V
Fig.22 -NMOS
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.22 Ta-RONN, RONP
Fig.23 Ta-VEN
Fig.24 Ta-ICC
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2009.05 Rev.A
Technical Note
FREQUENCY:FOSC[MHz]
VCC=PVCC
VOUT=1.5V
SLLM control
VOUT=1.5V
VOUT VCC=5V Ta=25 Io=0A
INPUT VOLTAGE:VCC
VOUT VCC=5V Ta=25
Fig.25 Vcc-Fosc
Fig.26 Soft start waveform
Fig.27 waveform Io=10mA
control
VOUT=1.5V VOUT
VOUT=1.5V VOUT
VOUT=1.5V
VOUT VCC=5V Ta=25
IOUT VCC=5V Ta=25
IOUT VCC=5V Ta=25
Fig.28 waveform Io=500mA
Fig. Transient response Io=100600mA(10s)
Fig.30 Transient response Io=600100mA(10s)
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2009.05 Rev.A
Characteristics dataBD9109FVM
Technical Note
Ta=25 Io=0A
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
INPUT VOLTAGE:VCC[V]
VCC=5V Ta=25 Io=0A
VOLTAGE:VEN[V]
VCC=5V Ta=25
OUTPUT CURRENT:IOUT
Fig.31 Vcc-Vout
Fig.32 Ven-Vout
Fig.33 Iout-Vout
3.50 3.45
OUTPUT VOLTAGE:VOUT[V]
FREQUENCY:FOSC[MHz]
3.40 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00
VCC=5V Io=0A
EFFICIENCY:[%]
1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
OUTPUT CURRENT:IOUT[mA] 1000
VCC=5V
VCC=5V Ta=25
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig. Ta-Vout
Fig.35 Efficiency
Fig.36 Ta-Fosc
0.40 0.35
RESISTANCE:RON[]
VCC=5V
VOLTAGE:VEN[V]
VCC=5V
CIRCUIT CURRENT:ICC[A]
VCC=5V
0.30 0.25 0.20 0.15 0.10 0.05 0.00
PMOS
NMOS
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.37 Ta-Ronn, Ronp
Fig.38 Ta-Ven
Fig.39 Ta-Icc
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2009.05 Rev.A
Technical Note
FREQUENCY:FOSC[MHz]
VCC=PVCC
SLLM control
VOUT VCC=5V Ta=25 Io=0A
INPUT VOLTAGE:VCC[V]
VOUT VCC=5V Ta=25
Fig.40 Vcc-Fosc
Fig.41 Soft start waveform
Fig.42 waveform Io=10mA
control VOUT VOUT
IOUT VOUT VCC=5V Ta=25 IOUT VCC=5V Ta=25 VCC=5V Ta=25
Fig.43 waveform Io=500mA
Fig. Transient response Io=100600mA(10s)
Fig.45 Transient response Io=600100mA(10s)
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2009.05 Rev.A
Characteristics dataBD9110NV
Technical Note
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.4V Ta=25 Io=0A
VOUT=1.4V VCC=5V Ta=25 Io=0A
VOUT=1.4V
INPUT VOLTAGE:VCC[V]
VOLTAGE:VEN[V]
VCC=5V Ta=25
OUTPUT CURRENT:IOUT
Fig.46 Vcc-Vout
Fig.47 Ven-Vout
Fig.48 Iout-Vout
1.45 1.44 1.43
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.4V VCC=5V Io=0A
EFFICIENCY:[%]
VOUT=1.4V VCC=5V Ta=25
FREQUENCY:FOSC[MHz]
1.20 1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
VCC=5V
1.42 1.41 1.40 1.39 1.38 1.37 1.36 1.35
TEMPERATURE:Ta[]
1000 OUTPUT CURRENT:IOUT[mA]
10000
TEMPERATURE:Ta[]
Fig. Ta-Vout
Fig.50 Efficiency
Fig.51 Ta-Fosc
0.40 0.35
VCC=5V
VOLTAGE:VEN[V]
VCC=5V
CIRCUIT CURRENT:I
VCC=5V
0.30 0.25 0.20 0.15 0.10 0.05 0.00
RESISTANCE:R
PMOS NMOS
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.52 Ta-Ronn, Ronp
Fig.53 Ta-Ven
Fig.54 Ta-Icc
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2009.05 Rev.A
Technical Note
Ta=25
FREQUENCY:FOSC[MHz]
VCC=PVCC
VOUT=1.4V
SLLM control
VOUT=1.4V
VOUT
VOUT VCC=5V Ta=25 Io=0A VCC=5V Ta=25
INPUT VOLTAGE:VCC
Fig.55 Vcc-Fosc
Fig.56 Soft start waveform
Fig.57 waveform Io=10mA
control
VOUT=1.4V
VOUT=1.4V VOUT
VOUT=1.4V
VOUT
IOUT VOUT VCC=5V Ta=25 IOUT VCC=5V Ta=25 VCC=5V Ta=25
Fig.58 waveform Io=500mA
Fig. Transient response Io=100600mA(10s)
Fig.60 Transient response Io=600100mA(10s)
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2009.05 Rev.A
Characteristics dataBD9120HFN
Technical Note
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
OUTPUT VOLTAGE:VOUT[V]
VOUT=1.5V Ta=25 Io=0A
VOUT=1.5V
VOUT=1.5V
VCC=3.3V Ta=25 Io=0A
VOLTAGE:VEN[V]
VCC=3.3V Ta=25
OUTPUT CURRENT:IOUT
INPUT VOLTAGE:VCC[V]
Fig.61 Vcc-Vout
Fig.62 Ven-Vout
Fig.63 Iout-Vout
1.55 1.54 1.53
OUTPUT VOLTAGE:VOUT[V]
1.20
EFFICIENCY:[%]
1.52 1.51 1.50 1.49 1.48 1.47 1.46 1.45
FREQUENCY:FOSC[MHz]
VOUT=1.5V VCC=3.3V Io=0A
VOUT=1.5V
1.15 1.10 1.05 1.00 0.95 0.90 0.85 0.80
VCC=3.3V
VCC=3.3V Ta=25
OUTPUT CURRENT:IOUT[mA] 1000
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig. Ta-Vout
Fig.65 Efficiency
Fig.66 Ta-Fosc
0.40 0.35
Fig. Ta-VOUT
VCC=3.3V
VOLTAGE:VEN[V]
VCC=3.3V
CIRCUIT CURRENT:I
VCC=3.3V
0.30 0.25 0.20 0.15 0.10 0.05 0.00
RESISTANCE:R
PMOS
NMOS
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
TEMPERATURE:Ta[]
Fig.67 Ta-Ronn, Ronp
Fig.68 Ta-Ven
Fig.69 Ta-Icc
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2009.05 Rev.A
Technical Note
Ta=25
FREQUENCY:FOSC[MHz]
VCC=PVCC
VOUT=1.5V
SLLM control
VOUT=1.5V
VOUT VOUT VCC=3.3V Ta=25 Io=0A VCC=3.3V Ta=25
INPUT VOLTAGE:VCC
Fig.70 Vcc-Fosc
Fig.71 Soft start waveform
Fig.72 waveform Io=10mA
control
VOUT=1.5V
VOUT=1.5V VOUT
VOUT=1.5V
VOUT
IOUT VOUT VCC=3.3V Ta=25 IOUT VCC=3.3V Ta=25 VCC=3.3V Ta=25
Fig.73 waveform Io=200mA
Fig. Transient response Io=100600mA(10s)
Fig.75 Transient response Io=600100mA(10µs)
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2009.05 Rev.A
Block Diagram, Application Circuit BD9106FVM, BD9107FVM
Technical Note
VREF Current Comp. Amp. SLOPE Soft Start
Input PVCC 10µF
PVCC
Current Sense/ Protect Driver Logic 4.7µH 10µF Output
PGND
UVLO
PGND
View
Fig.76 BD9106FVM,BD9107FVM View
Fig.77 BD9106FVM,BD9107FVM Block Diagram
BD9109FVM
VREF VOUT Current Comp. Amp. SLOPE PGND Soft Start Current Sense/ Protect
Input PVCC 10µF
PVCC
4.7µH Driver Logic 10µF PGND
Output
UVLO
View
VOUT
Fig.78 BD9109FVM View
Fig.79. BD9109FVM Block Diagram
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2009.05 Rev.A
Technical Note
BD9110NV
Input 10µF
VREF
PVCC PGND Amp. Soft Start UVLO SLOPE Current Comp Current Sense/ Protect Driver Logic
PVCC
2.2µH 22µF
Output
View
PGND
CITH
RITH
Fig.80 BD9110NV View
Fig.81 BD9110NV Block Diagram
BD9120HFN
VREF Current Comp Current Sense/ Protect Driver Logic 4.7µH 10µF Output PVCC 3.3V Input 10µF
PVCC PGND
View
Amp. Soft Start SLOPE
UVLO PGND
CITH
RITH
Fig.82 BD9120HFN View
Fig.83 BD9120HFN Block Diagram
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15/28
2009.05 Rev.A
number function BD9106FVM, BD9107FVM, BD9109FVM name ADJ/VOUT PGND PVCC
Technical Note
function Output voltage detect pin/ BD910607FVM GmAmp output pin/Connected phase compensation capacitor Enable pin(Active High) Ground source Pch/Nch drain output source power supply input
BD9110NV
name PGND PVCC
function Output voltage adjust power supply input GmAmp output pin/Connected phase compensation capacitor Ground source Pch/Nch drain output source Enable pin(Active High)
BD9120HFN
name PGND PVCC
function Output voltage adjust GmAmp output pin/Connected phase compensation capacitor Enable pin(Active High) Ground source Pch/Nch drain output source power supply input
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2009.05 Rev.A
Technical Note
Information advantages Advantage 1Offers fast transient response with current mode control system. Conventional product (VOUT which volts) BD9109FVM (Load response IO=100mA600mA)
VOUT 228mV VOUT 140mV
IOUT
IOUT
Voltage drop sudden change load reduced about 40%. Fig.84 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.
Efficiency
SLLM
heavier load: Utilizes synchronous rectifying mode on-resistance FETs incorporated power transistor. resistance P-channel FET: 0.20.35 (Typ.) resistance N-channel FET: 0.150.25 (Typ.)
inprovement SLLM system improvement synchronous rectifier
0.001
0.01 Output current Io[A]
Fig.85 Efficiency
Achieves efficiency improvement heavier load. Offers high efficiency load range with improvements mentioned above.
Advantage 3Supplied smaller package small-sized power incorporated. package like MOSP8, HSON8, SON008V5060) Allows reduction size application products Output capacitor required current mode control: ceramic capacitor Inductance required operating frequency MHz: inductor (BD9110NV:Co=22µF, L=2.2µH) Reduces mounting area required.
15mm DC/DC Convertor Controller RITH VOUT 10mm CITH
RITH CITH
Fig.86 Example application
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2009.05 Rev.A
Technical Note
Operation 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 MHz. 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 Level Shift Amp. RESET Driver Logic Load VOUT
VOUT
Fig.87 Diagram current mode control
Current Comp PVCC SENSE IL(AVE) Current Comp PVCC SENSE
RESET
RESET
VOUT
VOUT(AVE)
VOUT
VOUT(AVE)
switching
Fig.88 switching timing chart
Fig.89 SLLM switching timing chart
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2009.05 Rev.A
Technical Note
Description operations Soft-start function 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 50300 (Typ.) provided prevent output chattering.
Hysteresis 50300mV
VOUT
Soft start Standby mode Operating mode Standby mode UVLO
Operating mode
Standby mode
Operating mode
Standby mode
UVLO *Soft Start time(typ.)
UVLO
Fig.90 Soft start, Shutdown, UVLO timing chart BD9106FVM BD9107FVM BD9109FVM BD9110NV BD9120HFN Unit msec
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 VOUT Limit 1msec Standby mode *Timer Latch time (typ.) Standby mode Timer latch
Operating mode
Operating mode
Fig.91 Short-current protection circuit with time delay timing chart BD9106FVM BD9107FVM BD9109FVM BD9110NV BD9120HFN Unit msec
TLATCH
addition current limit circuit, output short detect circuit built BD9109FVM BD9120HFN. output voltage fall below 2V(typ, BD9109FVM) output voltage will hold turned OFF.
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19/28
2009.05 Rev.A
Switching regulator efficiency Efficiency expressed equation shown below: POUT POUT POUT+PD
Technical Note
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[] resistance inductor, RON[] resistance FETIOUT[A] Output current.) (Cgs[F]Gate capacitance FET,f[H]Switching frequency,V[V]Gate driving voltage FET) 3)PD(SW)= IDRIVE (CRSS[F]Reverse transfer capacitance FETIDRIVE[A]Peak current gate.)
4)PD(ESR)=IRMS (IRMS[A]Ripple current capacitor,ESR[]Equivalent series resistance.) (ICC[A]Circuit current.)
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.
1000 Power dissipation:Pd [mW]
SON008V5060 ROHM standard 1layer board j-a=138.9/W Using alone j-a=195.3/W
Power dissipation:Pd
Power dissipation:Pd
587.4mW
mounted glass epoxy j-a=212.8/W Using alone j-a=322.6/W
1.15W
mounted glass epoxy j-a=133.0/W Using alone j-a=195.3/W
0.90W
387.5mW
0.63W
0.64W
Ambient temperature:Ta
Ambient temperature:Ta
100105 Ambient temperature:Ta
Fig.92 Thermal derating curve (MSOP8)
Fig.93 Thermal derating curve (HSON8)
Fig.94 Thermal derating curve (SON008V5060)
VCC=5V, VOUT=3.3V, RCOIL=0.15, RONP=0.35, RONN=0.25 IOUT=0.8A, example, D=VOUT/VCC=3.3/5=0.66 =0.231+0.085 =0.316[] 298[mV]
duty (=VOUT/VCC) RCOILDC resistance coil RONPON resistance P-channel RONNON resistance N-channel IOUTOutput current
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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20/28
2009.05 Rev.A
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)
VOUT
Appropriate ripple current output should more less maximum output current. [A](2) [H](3)
(IL: Output ripple current, Switching frequency) Fig.95 Output ripple current 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=5V, VOUT=3.3V, f=1MHz, example,(BD9109FVM) =4.675 4.7[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. Less allows reduction output ripple voltage.
Fig.96 Output capacitor output rise time must designed fall within soft-start time, capacitance output capacitor should determined with consideration requirements equation (5): Tss: Soft-start time Ilimit: Over current detection level, 2A(Typ) VOUT case BD9109FVM, instance, VOUT=3.3V, IOUT=0.8A, TSS=1ms, Inappropriate capacitance cause problem startup. ceramic capacitor recommended. Selection input capacitor (Cin)
VOUT
Input capacitor select must capacitor capacitance sufficient cope with high ripple current prevent high transient voltage. ripple current IRMS given equation (6): OUT(VCC-VOUT) [A](6) Worst case IRMS(max.) IOUT When twice Vout, IRMS=
VCC=5V, VOUT=3.3V, IOUTmax.=0.8A, (BD9109FVM) 3.3(5-3.3) =0.38[ARMS] 10F/10V ceramic capacitor recommended reduce dissipation input capacitor better efficiency. Fig.97 Input capacitor
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2009.05 Rev.A
Technical Note
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.) IOUTMin. IOUTMax. fz(ESR)
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.98 Open loop gain characteristics
Gain [dB]
fp(Max.)=
fz(Amp.)
Phase [deg]
Zero power amplifier Increasing capacitance output capacitor lowers pole frequency while zero frequency does change. (This because when capacitance doubled, capacitor reduces half.) fz(Amp.)=
Fig.99 Error phase compensation characteristics
VOUT VOUT RITH CITH GND,PGND VOUT
VCC,PVCC
Fig.100 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 (7): VADJ: Voltage terminal (0.8V Typ.) With adjusted, output voltage determined required. Adjustable output voltage range 1.0V1.5V/ BD9107FVM, BD9120HFN 1.0V2.5V/BD106FVM, BD9110NV k100 resistor resistor resistance higher than used, check assembled carefully ripple voltage etc.
Output
Fig.101 Determination output voltage
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22/28
2009.05 Rev.A
BD9106FVM, BD9107FVM, BD9109FVM, BD9120HFN Cautions Board layout
Technical Note
RITH CITH
VOUT/ADJ
PVCC PGND
VOUT
Fig.102 Layout diagram BD9110NV Cautions Board layout RITH CITH PVCC PGND VOUT
Fig.103 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.
package HSON8 (BD9120HFN) SON008V5050 (BD9110NV) thermal reverse package. package thermal performance enhanced bonding plane which take large area PCB.
Table1. [BD9106FVM] Symbol Part CITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor
Value 4.7H 750pF VOUT=1.0V VOUT=1.2V
Manufacturer Sumida Kyocera Kyocera murata ROHM ROHM ROHM ROHM ROHM
Series CMD6D11B VLF5014AT-4R7M1R1 CM316X5R106K10A CM316X5R106K10A GRM18series MCR10 1802 MCR10 2202 MCR10 2202 MCR10 2702 MCR10 3602
RITH
Resistance
VOUT=1.5V VOUT=1.8V VOUT=2.5V
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23/28
2009.05 Rev.A
Table2. [BD9107FVM] Symbol Part CITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor
Technical Note
Value 4.7H 1000pF VOUT=1.0V 4.3k 6.8k 9.1k VOUT=1.2V VOUT=1.5V VOUT=1.8V
Manufacturer Sumida Kyocera Kyocera murata ROHM ROHM ROHM ROHM
Series CMD6D11B VLF5014AT-4R7M1R1 CM316X5R106K10A CM316X5R106K10A GRM18series MCR10 4301 MCR10 6801 MCR10 9101 MCR10 1202
RITH
Resistance
Table3. [BD9109VM] Symbol Part CITH RITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor Resistance
Value 4.7H 330pF
Manufacturer Sumida Kyocera Kyocera murata ROHM
Series CMD6D11B VLF5014AT-4R7M1R1 CM316X5R106K10A CM316X5R106K10A GRM18series MCR10 3002
Table4. [BD9110NV] Symbol Part CITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor
Value 2.2H 1000pF VOUT=1.0V VOUT=1.2V
Manufacturer Kyocera Kyocera murata
Series LTF5022T-2R2N3R2 CM316X5R106K10A CM316B226K06A GRM18series
RITH
Resistance
VOUT=1.5V VOUT=1.8V VOUT=2.5V
ROHM
MCR10 1202
Table5. [BD9120HFN] Symbol Part CITH RITH Coil Ceramic capacitor Ceramic capacitor Ceramic capacitor Resistance
Value 4.7H 680pF VOUT=1.0V VOUT=1.2V VOUT=1.5V 8.2k 8.2k 4.7k
Manufacturer Sumida Kyocera Kyocera murata ROHM ROHM ROHM
Series CMD6D11B VLF5014AT-4R7M1R1 CM316X5R106K10A CM316X5R106K10A GRM18series MCR10 8201 MCR10 8201 MCR10 4701
*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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24/28
2009.05 Rev.A
equivalence circuit BD9106FVM, BD9107FVM, BD9109FVM
PVCC PVCC PVCC
Technical Note
(BD9106FVM, BD9107FVM)
VOUT (BD9109FVM)
VOUT
BD9110NV, BD9120HFN
PVCC
PVCC
PVCC
(BD9110NV)
(BD9120HFN)
Fig.104 equivalence circuit
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25/28
2009.05 Rev.A
Technical Note
Notes 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 (Pin activation parasitic elements.
Resistance (Pin (Pin Transistor (NPN) (Pin Parasitic diode Parasitic diode transistor substrate Parasitic diode transistor Parasitic diode
substrate
Fig.105 Simplified structure monorisic 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.
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26/28
2009.05 Rev.A
Ordering part number
Technical Note
Part
Part 9110 9120 9106 ,9107,9109
Package
SON008V5060 HFN:MSOP8 FVM:HSON8
Packaging forming specification
Embossed tape reel (SON008V5060,) Embossed tape reel (MSOP8, HSON8)
MSOP8
<Tape Reel information>
2.9±0.1 (MAX 3.25 include BURR)
Tape
0.29±0.15 0.6±0.2
Embossed carrier tape 3000pcs
direction 1pin product upper right when hold
Quantity Direction feed
4.0±0.2
2.8±0.1
reel left hand pull tape right hand
1pin
1PIN MARK 0.475 +0.05 0.22 -0.04 0.08 0.65
+0.05 0.145 -0.03
0.9MAX 0.75±0.05
0.08±0.05
Direction feed
(Unit
Reel
Order quantity needs multiple minimum quantity.
HSON8
<Tape Reel information>
2.9±0.1 (MAX include BURR)
(0.2)
(2.2)
(0.05)
Tape Quantity
Embossed carrier tape 3000pcs
direction 1pin product upper right when hold
0.475
(0.15)
(0.3)
5678
(0.45)
(0.2) (1.8)
Direction feed
+0.1 0.13 -0.05
reel left hand pull tape right hand
1pin
1234
4321
1PIN MARK
0.6MAX
+0.03 0.02 -0.02
0.65 0.32±0.1
0.08
Direction feed
(Unit
Reel
Order quantity needs multiple minimum quantity.
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27/28
2009.05 Rev.A
Technical Note
SON008V5060
5.0±0.15
0.15
<Tape Reel information>
Tape Quantity Direction feed Embossed carrier tape 2000pcs
direction 1pin product upper left when hold
1.0MAX
1PIN MARK
+0.03 0.02 -0.02 (0.22)
reel left hand pull tape right hand
0.08 C0.25
4.2±0.1 1.27
0.59
+0.05 -0.04
1pin
Direction feed
(Unit
Reel
Order quantity needs multiple minimum quantity.
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28/28
2009.05 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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