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PDF BD9152MUV Data sheet ( Hoja de datos )
| Número de pieza | BD9152MUV | |
| 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
BD9152MUV
No.10027ECT14
●Description
ROHM’s high efficiency dual step-down switching regulator BD9152MUV is a power supply designed to produce a low
voltage including 3.3,0.8 volts from 5.5/4.5 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) Incorporates soft-start function.
4) Incorporates thermal protection and ULVO functions.
5) Incorporates short-current protection circuit with time delay function.
6) Incorporates shutdown function Icc=0μA(Typ.)
7) Employs small surface mount package : VQFN020V4040
●Application
Power supply for LSI including DSP, Micro computer and ASIC
●Absolute Maximum Rating (Ta=25℃)
Parameter
Vcc Voltage
EN Voltage
SW Voltage
Power Dissipation
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Symbol
VCC
VEN1
VEN2
VSW1
VSW2
Pd1
Pd2
Pd3
Pd4
Topr
Tstg
Tjmax
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
-40～+85
-55～+150
+150
Unit
V
V
V
V
V
W
W
W
W
℃
℃
℃
*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
●Operating Conditions (Ta=-40～+105℃)
Parameter
Vcc Voltage
EN Voltage
Output Voltage range
SW Average Output Current
*6 Pd and ASO should not be exceeded.
Symbol
VCC
VEN1
VEN2
VOUT2
ISW1
ISW2
Limit
Min. Typ. Max.
4.5 5.0 5.5
0 - 5.5
0 - 5.5
0.8 - 2.5
- - 1.5*6
- - 1.5*6
Unit
V
V
V
V
A
A
www.rohm.com
○c 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.04 - Rev.C
1 page  
BD9152MUV
●Characteristics data
VCC=5V,Ta=25℃
EN1=E2
VOUT1
VOUT2
VCC=5V,Ta=25℃
SW1
VOUT1
Technical Note
VCC=5V,Ta=25℃
SW1
VOUT1
Fig.15 Soft start wave form
(Io=1.5A)
VCC=5V,Ta=25℃,VOUT2=1.2V
Fig.16 SW1 wave form
(Io=0mA)
Fig.17 SW1 wave form
(Io=1.5A)
VCC=5V,Ta=25℃,VOUT2=1.2V
SW2
VOUT2
VCC=5V,Ta=25℃
VOUT1
IOUT1
Fig.18 SW2 wave form
(Io=0mA)
Fig.19 SW2 wave form
(Io=1.5A)
Fig.20 VOUT1 transient responce
(Io0.5A→1.5A / usec)
VCC=5V,Ta=25℃
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
IOUT2
VOUT2
VCC=5V,Ta=25℃,VOUT2=1.2V
IOUT2
Fig.21 VOUT1 transient responce
(Io1.5A→0.5A/ usec)
Fig.22 VOUT2 transient responce
(Io0.5A→1.5A/ usec)
Fig.23 VOUT2 transient responce
(Io1.5A→0.5A/ usec)
www.rohm.com
○c 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.04 - Rev.C
5 Page 
BD9152MUV
Technical Note
●Selection of components externally connected
1. Selection of inductor (L)
IL
VCC
IL
L
ΔIL
VOUT
Co
Fig.33 Output ripple current
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=1.0MHz, ΔIL=0.3×1.5A=0.45A, for example,(BD9152MUV)
(5-1.2)×1.2
L= 0.45×5×1.0M =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
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
L
Co
√VOUT(VCC-VOUT)
IRMS=IOUT×
VCC
[A]・・・(5)
< Worst case > IRMS(max.)
IOUT
When Vcc=2×VOUT, IRMS= 2
Fig.35 Input capacitor
If VCC=5.0V, VOUT=1.8V, and IOUTmax.=1.5A, (BD9152MUV)
√1.8(5.0-1.8)
IRMS=2×
5.0 =0.48[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 BD9152MUV.PDF ] | |
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