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PDF BD9151MUV Data sheet ( Hoja de datos )
| Número de pieza | BD9151MUV | |
| Descripción | Output 1.5A or Less High Efficiency Step-down Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
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Single-chip Type with Built-in FET Switching Regulator Series
Output 1.5A or Less High Efficiency
Step-down Switching Regulator
with Built-in Power MOSFET
BD9151MUV
No.09027EBT11
●Description
ROHM’s high efficiency dual step-down switching regulator BD9151MUV is a power supply designed to produce a low
voltage including 1.8 volts or 1.2 volts from 2.8 volts to 5.0 volts power supply line. Reset circuits of input power supply
voltage and external Pch MOSFET gate controller are incorporated. 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 (Pch/Nch FET) and SLLMTM (Simple Light Load Mode)
3) Incorporates soft-start function.
4) Incorporates Thermal / ULVO protection functions.
5) Incorporates thermal protection and short-current protection circuit with timer latch function. .
6) Incorporates shutdown function Icc=0µA(Typ.)
7) Incorporates reset function
8) Incorporates Pch MOSFET gate controller
9) Employs small surface mount package : VQFN020V4040
●Applications
Power supply for LSI including DSP, Micro computer and ASIC
●Absolute maximum ratings (Ta=25℃)
Parameter
Vcc Voltage
Symbol
AVCC
PVcc
Limit
-0.3～+7*1
-0.3～+7*1
Unit
V
V
EN Voltage
VEN
-0.3～+7
V
SW Voltage
Power Dissipation
VSW1
VSW2
Pd1
Pd2
Pd3
-0.3～+7
-0.3～+7
0.34*2
0.70*3
2.21*4
V
V
W
W
W
Pd4
3.56*5
W
Operating Temperature Range
Topr
-40～+85
℃
Storage Temperature Range
Tstg
-55～+150
℃
Maximum Junction Temperature
Tjmax
+150
℃
*1 Pd, ASO and Tj=150℃ should not be exceeded.
*2 IC only
*3 1-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm2
*4 4-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 10.29mm2 , 2-3 layers 5505 mm2
*5 4-layer. mounted on a 74.2mm×74.2mm×1.6mm glass-epoxy board, occupied area by copper foil : 5505mm2, in each layers
●Operating conditions (Ta=-40～+85℃)
Parameter
Vcc Voltage
EN Voltage
SW Average Output Current
*6 Pd and ASO should not be exceeded.
Symbol
AVCC、PVCC
VEN
ISW1
ISW2
Min.
2.8
0
-
-
Typ.
3.3
-
-
-
Max.
5.5
5.5
0.4*6
0.8*6
Unit
V
V
A
A
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/16
2009.09 - Rev.B
1 page  
BD9151MUV
VCC=3.3V,Ta=25℃
VOUT2
VOUT1
VOUT3
VCC=3.3V,Ta=25℃
VOUT2
VOUT1
VOUT3
Technical Note
VCC=3.3V,Ta=25℃
VOUT1
VOUT2
PGATE
Fig.15 Soft start waveform
(Io1=0mA,Io2=0mA,Io3=0mA)
Fig.16 Soft start waveform
(Io1=400mA,Io2=800mA,Io3=600mA)
Fig.17 Soft start waveform
(Io1=0mA,Io2=0mA,PGATE)
VOUT2
VOUT1
RESET
SW1
VOUT1
VCC=3.3V,Ta=25℃,VOUT1=1.8V
Fig.18 Soft start waveform
(Io1=0mA,Io2=0mA,RESET)
Fig.19 SW1 waveform
(Io=0mA)
SW1
VOUT1
VCC=3.3V,Ta=25℃,VOUT1=1.8V
Fig.20 SW1 waveform
(Io=400mA)
SW2
VCC=3.3V,Ta=25℃,VOUT=1.8V
SW2
VOUT1
VOUT2
VCC=3.3V,Ta=25℃,VOUT2=1.2V
VOUT2
VCC=3.3V,Ta=25℃,VOUT2=1.2V
IOUT1
Fig.21 SW2 waveform
(Io=0mA)
Fig.22 SW2 waveform
(Io=800mA)
Fig.23 VOUT1 transient response
(Io=200mA→400mA / 10usec)
VOUT1
VCC=5V,Ta=25℃,VOUT=1.8V
IOUT1
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
IOUT2
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
IOUT2
Fig.24 VOUT1 transient response
(Io=400mA→200mA/ 10usec)
Fig.25 VOUT2 transient response
(Io=400mA→800mA/ 10usec)
Fig.26 VOUT2 transient response
(Io=800mA→400mA/ 10usec)
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/16
2009.09 - Rev.B
5 Page 
BD9151MUV
Technical Note
3. Selection of input capacitor (Cin)
VCC
Cin
VOUT
L
Co
Fig.35 Input capacitor
Input capacitor to select must be a low ESR capacitor of the capacitance
sufficient to cope with high ripple current to prevent high transient voltage. The
ripple current IRMS is given by the equation (5):
√VOUT(VCC-VOUT)
IRMS=IOUT×
VCC
[A]・・・(5)
< Worst case > IRMS(max.)
When Vcc=2×VOUT, IRMS=
IOUT
2
If VCC=5.0V, VOUT=1.8V, and IOUTmax.=0.4A, (BD9151MUV)
IRMS=2×
√1.8(5.0-1.8)
5.0 =0.48[ARMS]
A low ESR 22µF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency.
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, adding a zero to the power amplifier output with C easily
compensates the phases and R as described below to cancel a pole at the power amplifier.
A
Gain
[dB] 0
0
Phase
[deg]
-90
fp(Min.)
fp(Max.)
IOUTMin.
IOUTMax.
fz(ESR)
fp= 1
2π×RO×CO
fz(ESR)=
1
2π×ESR×CO
Pole at power amplifier
When the output current decreases, the load resistance Ro
increases and the pole frequency lowers.
Fig.36 Open loop gain characteristics
fp(Min.)=
1
2π×ROMax.×CO
[Hz]←with lighter load
fp(Max.)=
1
2π×ROMin.×CO
[Hz] ←with heavier load
A
Gain
[dB]
0
0
Phase
[deg]
-90
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
Fig.37 Error amp phase compensation characteristics
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/16
2009.09 - Rev.B
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet BD9151MUV.PDF ] | |
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