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PDF BD9150MUV Data sheet ( Hoja de datos )
| Número de pieza | BD9150MUV | |
| Descripción | Output 1.5A or Less High Efficiency Step-down Switching Regulator | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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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
BD9150MUV
No.10027ECT13
●Description
ROHM’s high efficiency dual step-down switching regulator BD9150MUV is a 2ch output power supply designed to produce
a low voltage including 3.3,1.2 volts from 5.0 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 (Pch/Nch FET)
and SLLMTM (Simple Light Load Mode)
3) 2ch output power supply.
4) Each of EN controls 2ch output.
5) Incorporates soft-start function.
6) Incorporates ULVO functions.
7) Incorporates thermal protection and short-current protection circuit with time delay function.
8) Incorporates shutdown function Icc=0μA(Typ.)
9) Output current max 1.5A/1.5A.
10) Employs small surface mount package : VQFN020V4040
●Use
Power supply for LSI including DSP, Micro computer and ASIC
●Absolute Maximum Rating (Ta=25℃)
Parameter
Vcc Voltage
EN Voltage
SW Voltage
Power Dissipation
Symbol
VCC
VEN1
VEN2
VSW1
VSW2
Pd1
Pd2
Pd3
Pd4
Limit
-0.3～+7 *1
-0.3～+7
-0.3～+7
-0.3～+7
-0.3～+7
0.34*2
0.70 *3
1.21 *4
3.56*5
Unit
V
V
V
V
V
W
W
W
W
Operating Temperature Range
Topr
-40～+85
℃
Storage Temperature Range
Tstg
-55～+150
℃
Maximum Junction
Tjmax
+150
℃
*1 Pd 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 , in each layers
*5 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
○c 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.04 - Rev.C
1 page  
BD9150MUV
●Characteristics data【BD9150MUV】
VCC=5V,Ta=25℃
EN1=E2
VCC=5V,Ta=25℃
SW1
VOUT1
VOUT2
VOUT1
Fig.15 Soft start waveform
(Io=1.5A)
Fig.16 SW1 waveform
(Io=0mA)
Technical Note
VCC=5V,Ta=25℃
SW1
VOUT1
Fig.17 SW1 waveform
(Io=1.5A)
VCC=5V,Ta=25℃,VOUT2=1.2V
SW2
VCC=5V,Ta=25℃,VOUT2=1.2V
SW2
VCC=5V,Ta=25℃
VOUT1
VOUT2
VOUT2
IOUT1
Fig.18 SW2 waveform
(Io=0mA)
Fig.19 SW2 waveform
(Io=1.5A)
Fig.20 VOUT1 Transient Response
(Io0.5A→1.5A / usec)
VOUT1
IOUT1
VCC=5V,Ta=25℃
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
IOUT2
IOUT2
Fig.21VOUT1 Transient Response
(Io1.5A→0.5A/ usec)
Fig.22 VOUT2 Transient Response
(Io0.5A→1.5A/ usec)
Fig.23 VOUT2 Transient Response
(Io1.5A→0.5A/ usec)
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○c 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.04 - Rev.C
5 Page 
BD9150MUV
●Selection of components externally connected
1. Selection of inductor (L)
IL
ΔIL
VCC
IL
VOUT
L
Co
Fig.33 Output ripple current
Technical Note
The inductance significantly depends on output ripple current.
As seen in the equation (1), the ripple current decreases as the
inductor and/or switching frequency increases.
(VCC-VOUT)×VOUT
ΔIL=
L×VCC×f
[A]・・・(1)
Appropriate ripple current at output should be 20% more or less of the
maximum output current.
ΔIL=0.2×IOUTmax. [A]・・・(2)
(VCC-VOUT)×VOUT
L= ΔIL×VCC×f
[H]・・・(3)
(ΔIL: Output ripple current, and f: Switching frequency)
※Current exceeding the current rating of the inductor results in magnetic saturation of the inductor, which decreases efficiency.
The inductor must be selected allowing sufficient margin with which the peak current may not exceed its current rating.
If VCC=5.0V, VOUT=1.2V, f=1.5MHz, ΔIL=0.2×1.5A=0.3A, for example,(BD9150MUV)
(5-1.2)×1.2
L= 0.3×5×1.5M =2.02μ → 2.2[μH]
※Select the inductor of low resistance component (such as DCR and ACR) to minimize dissipation in the inductor for better
efficiency.
2. Selection of output capacitor (CO)
VCC
VOUT
L
ESR
Co
Fig.34 Output capacitor
Output capacitor should be selected with the consideration on the stability region
and the equivalent series resistance required to smooth ripple voltage.
Output ripple voltage is determined by the equation (4)：
ΔVOUT=ΔIL×ESR [V]・・・(4)
(ΔIL: Output ripple current, ESR: Equivalent series resistance of output capacitor)
※Rating of the capacitor should be determined allowing sufficient margin against
output voltage. A 22μF to 100μF ceramic capacitor is recommended.
Less ESR allows reduction in output ripple voltage.
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=1.2V, and IOUTmax.=1.5A, (BD9150MUV)
IRMS=2×
√1.2(5.0-1.2)
5.0 =0.85[ARMS]
A low ESR 22μF/10V ceramic capacitor is recommended to reduce ESR dissipation of input capacitor for better efficiency.
www.rohm.com
○c 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.04 - Rev.C
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet BD9150MUV.PDF ] | |
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