Single-chip Type with built-in FET Switching Regulator Series
Output 2A or More High-efficiency
Step-down Switching Regulator
with Built-in Power MOSFET
BD9130NV
No.09027EAT36
●Description
ROHM’s high efficiency step-down switching regulator BD9130NV is a power supply designed to produce a low voltage
including 1 volts from 5.5/3.3 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 (Nch/Pch FET)
TM
and SLLM (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
7) Employs small surface mount package : SON008V5060
●Use
Power supply for LSI including DSP, Micro computer and ASIC
●Line
up
Parameter
V
CC
Voltage
PV
CC
Voltage
EN Voltage
SW,ITH Voltage
Power Dissipation 1
Power Dissipation 2
Operating temperature range
Storage temperature range
Maximum junction temperature
*1
*2
*3
Symbol
V
CC
PV
CC
V
EN
V
SW
,V
ITH
Pd1
Pd2
Topr
Tstg
Tjmax
Limits
-0.3½+7
*1
-0.3½+7
*1
-0.3½+7
-0.3½+7
900
*2
3900
*3
-25½+105
-55½+150
+150
Unit
V
V
V
V
mW
mW
℃
℃
℃
Pd should not be exceeded.
Derating in done 7.2mW/℃ for temperatures above Ta=25℃, Mounted on 70mm×70mm×1.6mm Glass Epoxy PCB.
Derating in done 31.2mW/℃ for temperatures above Ta=25℃, Mounted on JESD51-7.
●Operating
Conditions (Ta=25℃)
Parameter
V
CC
Voltage
PV
CC
Voltage
EN Voltage
SW average output current
Output voltage Setting Range
*4
*5
Symbol
V
CC
*4
P
VCC
*4
V
EN
Isw
*4
V
OUT
Limits
Min.
2.7
*5
2.7
*5
0
-
1.0
Typ.
3.3
3.3
-
-
-
Max.
5.5
5.5
VCC
2.0
2.5
Unit
V
V
V
A
V
Pd should not be exceeded.
In case set output voltage 1.6V or more, VccMin. = Vout + 1.3V.
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© 2009 ROHM Co., Ltd. All rights reserved.
1/14
2009.05 - Rev.A
BD9130NV
●Electrical
Characteristics
◎
(Ta=25℃, V
CC
=PV
CC
=3.3V, EN=V
CC
, R
1
=10kΩ, R
2
=5kΩ, unless otherwise specified.)
Parameter
Symbol
Min.
Typ.
Max.
Standby current
Bias current
EN Low voltage
EN High voltage
EN input current
Oscillation frequency
Pch FET ON resistance
Nch FET ON resistance
ADJ Voltage
Output voltage
ITH sink current
ITH source current
UVLO threshold voltage
UVLO release voltage
Soft start time
Timer latch time
Output Short circuit Threshold Voltage
●Block
Diagram, Application Circuit
V
CC
EN
ADJ 1
V
CC
2
ITH 3
GND 4
8 EN
7 PV
CC
6 SW
5 PGND
Gm Amp.
SLOPE
OSC
V
CC
Current
Comp
R Q
S
CLK
Current
Sense/
Protect
+
Driver
Logic
8
Technical Note
Unit
μA
μA
V
V
μA
MHz
mΩ
mΩ
V
V
μA
μA
V
V
ms
ms
V
OUT
Conditions
EN=GND
Standby mode
Active mode
V
EN
=3.3V
P
VCC
=3.3V
P
VCC
=3.3V
I
STB
I
CC
V
ENL
V
ENH
I
EN
F
OSC
R
ONP
R
ONN
V
ADJ
V
OUT
I
THSI
I
THSO
V
UVLO1
V
UVLO2
T
SS
T
LATCH
V
SCP
-
-
-
2.0
-
0.8
-
-
0.788
-
10
10
2.400
2.425
0.5
1
-
0
250
GND
V
CC
1
1
200
160
0.800
1.200
20
20
2.500
2.550
1
2
V
OUT
×0.5
10
400
0.8
-
10
1.2
400
350
0.812
-
-
-
2.600
2.700
2
3
V
OUT
×0.7
V
ADJ
=1.0V
V
ADJ
=0.6V
V
CC
=3→0V
V
CC
=0→3V
SCP/TSD operated
V
OUT
=1.2→0V
VREF
2
V
CC
3.3V
Input
10µF
7
PV
CC
TOP View
6
2.2µH
SW
22µF
Output
Fig.1 TOP View
Soft
Start
UVLO
TSD
SCP
5
PGND
4
GND
ITH
C
ITH
1
ADJ
3
R
ITH
R1
R2
Fig.2 Block Diagram
●Pin
number and function table
Pin No.
1
2
3
4
5
6
7
8
Pin name
ADJ
V
CC
ITH
GND
PGND
SW
PV
CC
EN
PIN function
Output voltage detect pin
VCC power supply input pin
GmAmp output pin/Connected phase compensation capacitor
Ground
Nch FET source pin
Pch/Nch FET drain output pin
Pch FET source pin
Enable pin(Active High)
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© 2009 ROHM Co., Ltd. All rights reserved.
2/14
2009.05 - Rev.A
BD9130NV
●Characteristic
curves (Reference data)
3.0
2.5
OUTPUT VOLTAGE:VOUT[V]
Technical Note
2.0
3.0
OUTPUT VOLTAGE:VOUT[V]
1.5
OUTPUT VOLTAGE:VOUT[V]
【V
OUT
=2.5V】
Ta=25℃
Io=0A
【V
OUT
=1.8V】
2.5
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
0
1
2
3
4
INPUT VOLTAGE:V
CC
[V]
5
1.0
【V
OUT
=1.8V】
Ta=25℃
Io=2A
0.5
VCC=3.3V
Ta=25℃
Io=0A
0
1
2
3
EN VOLTAGE:VEN[V]
4
5
【V
OUT
=2.5V】
VCC=5V
Ta=25℃
【V
OUT
=1.8V】
VCC=3.3V
Ta=25℃
5
0.0
0
1
2
3
4
OUTPUT CURRENT:I
OUT
[A]
Fig.3 Vcc-Vout
Fig.4 Ven-Vout
Fig.5 Iout-Vout
1.85
1.84
OUTPUT VOLTAGE:VOUT[V]
100
1.20
1.15
【V
OUT
=1.8V】
VCC=3.3V
Io=0A
90
VCC=3.3V
EFFICIENCY:
η
[%]
1.82
1.81
1.80
1.79
1.78
1.77
1.76
1.75
-25
70
60
50
40
30
20
10
0
【V
OUT
=1.8V】
VCC=3.3V
Ta=25℃
FREQUENCY:F
OSC
[MHz]
1.83
80
1.10
1.05
1.00
0.95
0.90
0.85
0.80
【V
OUT
=2.5V】
VCC=5V
Ta=25℃
0
25
50
75
100
TEMPERATURE:Ta[
℃
]
1
10
100
1000
OUTPUT CURRENT:I
OUT
[mA]
10000
-25
0
25
50
75
TEMPERATURE:Ta[
℃
]
100
Fig. 6 Ta-Vout
Fig.7 Efficiency
Fig.8 Ta-Fosc
0.40
0.35
ON RESISTANCE:R
ON
[
Ω
]
2.0
300
VCC=3.3V
1.8
1.6
EN VOLTAGE:VEN[V]
VCC=3.3V
CIRCUIT CURRENT:I
CC
[
μ
A]
270
240
210
180
150
120
90
60
30
VCC=3.3V
0.30
0.25
0.20
0.15
0.10
0.05
0.00
-25
0
25
50
75
TEMPERATURE:Ta[
℃
]
100
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-25
0
25
50
75
TEMPERATURE:Ta[
℃
]
100
PMOS
NMOS
0
-25
0
25
50
75
TEMPERATURE:Ta[
℃
]
100
Fig.9 Ta-R
ONN
R
ONP
Fig.10 Ta-V
EN
Fig.11 Ta-Icc
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© 2009 ROHM Co., Ltd. All rights reserved.
3/14
2009.05 - Rev.A
BD9130NV
●Cteristic
curves (Reference data) – Continued
Technical Note
1.2
Ta=25℃
FREQUENCY:F
OSC
[MHz]
1.1
V
CC
=PV
CC
=EN
【V
OUT
=1.8V】
SW
【SLLM
TM
control
V
OUT
=1.8V】
1
V
OUT
0.9
V
OUT
VCC=3.3V
Ta=25℃
Io=0A
0.8
2.7
VCC=3.3V
Ta=25℃
3.1
3.5
3.9
4.3
4.7
INPUT VOLTAGE:V
CC
[V]
5.1
5.5
Fig.12 Vcc-Fosc
Fig.13 Soft start waveform
Fig.14 SW waveform Io=10mA
【PWM
control
V
OUT
=1.8V】
【V
OUT
=1.8V】
【V
OUT
=1.8V】
V
OUT
V
OUT
VCC=3.3V
Ta=25℃
I
OUT
VCC=3.3V
Ta=25℃
I
OUT
VCC=3.3V
Ta=25℃
Fig.15 SW waveform Io=200mA
Fig. 16 Transient response
Io=1A→2A(10μs)
Fig.17 Transient response
Io=2A→1A(10μs)
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© 2009 ROHM Co., Ltd. All rights reserved.
4/14
2009.05 - Rev.A
BD9130NV
●Information
on advantages
Advantage 1：Offers fast transient response with current mode control system.
Conventional product (Load response I
O
=0.1A→0.6A)
V
OUT
V
OUT
110mV
Technical Note
BD9139NV (Load response I
O
=1A→2A)
29mV
I
OUT
I
OUT
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.18 Comparison of transient response
Advantage 2： Offers high efficiency for all load range.
・For
lighter load:
TM
Utilizes the current mode control mode called SLLM for lighter load, which reduces various dissipation such as switching
dissipation (P
SW
), gate charge/discharge dissipation, ESR dissipation of output capacitor (P
ESR
) and on-resistance
dissipation (P
RON
) that may otherwise cause degradation in efficiency for lighter load.
100
Achieves efficiency improvement for lighter load.
Efficiency
η[%]
SLLM
TM
②
・For
heavier load:
Utilizes the synchronous rectifying mode and the low on-resistance
MOS FETs incorporated as power transistor.
ON resistance of P-channel MOS FET : 200mΩ(Typ.)
ON resistance of N-channel MOS FET : 160mΩ(Typ.)
50
①
PWM
TM
①inprovement
by SLLM
system
②improvement
by synchronous rectifier
0
0.001
0.01
0.1
Output current Io[A]
1
Fig.19 Efficiency
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
Advantage 3：・Supplied in smaller package due to small-sized power MOS FET incorporated.
・Output
capacitor Co required for current mode control: 22μF ceramic capacitor
・Inductance
L required for the operating frequency of 1 MHz: 2.2μH inductor
(BD9130NV:Co=22μF, L=2.2μH)
Reduces a mounting area required.
V
CC
15mm
Cin
C
IN
DC/DC
Convertor
Controller
R
ITH
L
V
OUT
Co
10mm
C
ITH
C
O
L
R
ITH
C
ITH
Fig.20 Example application
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© 2009 ROHM Co., Ltd. All rights reserved.
5/14
2009.05 - Rev.A
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