Datasheet
4.5V to 5.5V, 2.0A 1ch
Synchronous Buck Converter with
Integrated FET
BD9111NV
General Description
The BD9111NV is ROHM’s high efficiency step-down
switching regulator designed to produce a voltage as
low as 3.3V from a supply voltage of 5V. It offers high
efficiency by using pulse skip control technology and
synchronous switches, and provides fast transient
response to sudden load changes by implementing
current mode control.
Key Specifications
Input Voltage Range:
Output Voltage:
Output Current:
Switching Frequency:
Pch FET ON Resistance:
Nch FET ON Resistance:
Standby Current:
Operating Temperature Range:
4.5V to 5.5V
3.3V(Typ)
2.0A (Max)
1MHz(Typ)
200mΩ(Typ)
150mΩ(Typ)
0μA (Typ)
-25°C to +105°C
Features
■
■
■
■
■
■
Fast Transient Response because of Current Mode
PWM Control System
High Efficiency for All Load Ranges because of
Synchronous Switches (Nch and Pch FET) and
SLLM
TM
(Simple Light Load Mode)
Soft-Start Function
Thermal Shutdown and UVLO Functions
Short-Circuit Protection with Time Delay Function
Shutdown Function
Package
W(Typ) x D(Typ) x H(Max)
Applications
Power Supply for LSI including DSP, Microcomputer
and ASIC
SON008V5060
5.00mm x 6.00mm x 1.00mm
Typical Application Circuit
V
CC
C
IN
EN
VCC,PVCC
SW
L
V
OUT
V
OUT
VOUT
C
O
ITH
GND,PGND
R
ITH
C
ITH
Figure 1. Typical Application Circuit
○Product
structure：Silicon monolithic integrated circuit
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© 2012 ROHM Co., Ltd. All rights reserved.
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○
This product has no designed protection against radioactive rays
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BD9111NV
Pin Configuration
(TOP VIEW)
Datasheet
Figure 2. Pin Configuration
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
VOUT
VCC
ITH
GND
PGND
SW
PVCC
EN
Output voltage pin
Power supply input pin
GmAmp output pin/connected phase compensation capacitor
Ground pin
Nch FET source pin
Pch/Nch FET drain output pin
Pch FET source pin
Enable pin (Active High)
Pin Function
Block Diagram
V
CC
V
CC
EN
8
2
7
Current
Comp
R Q
S
Gm Amp.
SLOPE
OSC
V
CC
VCC
Soft
Start
UVLO
TSD
SCP
1
VOUT
3
ITH
R
ITH
C
ITH
5
PGND
4
GND
C LK
Current
Sense/
Protect
+
Driver
Logic
6
2.2µH
SW
22µF
Output
PV
CC
PVCC
22µF
V
CC
VCC
5V
Input
VREF
Figure 3. Block Diagram
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© 2012 ROHM Co., Ltd. All rights reserved.
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BD9111NV
Absolute Maximum Ratings
(Ta=25°C)
Parameter
VCC Voltage
PVCC Voltage
EN Voltage
SW, ITH Voltage
Power Dissipation 1
Power Dissipation 2
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Symbol
V
CC
PV
CC
V
EN
V
SW
,V
ITH
Pd1
Pd2
Topr
Tstg
Tjmax
Rating
-0.3 to +7
(Note 1)
-0.3 to +7
(Note 1)
-0.3 to +7
-0.3 to +7
0.9
(Note 2)
3.9
(Note 3)
-25 to +105
-55 to +150
+150
Unit
V
V
V
V
W
W
°C
°C
°C
Datasheet
(Note 1)
Pd should not be exceeded.
(Note 2)
Reduce by 7.2mW/°C for temperatures above Ta=25°C, mounted on 70mmx70mmx1.6mm Glass Epoxy PCB (the density of copper:3%)
(Note 3)
Reduce by 31.2mW/°C for temperatures above Ta=25°C, mounted on JESD51-7.
Caution:
Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit
between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated over
the absolute maximum ratings.
Recommended Operating Conditions
(Ta=25°C)
Parameter
VCC Voltage
PVCC Voltage
EN Voltage
SW Average Output Current
(Note 4) Pd should not be exceeded.
Symbol
V
CC (Note 4)
PV
CC(Note4)
V
EN
Isw
(Note 4)
Rating
Min
4.5
4.5
0
-
Typ
5.0
5.0
-
-
Max
5.5
5.5
V
CC
2.0
Unit
V
V
V
A
Electrical Characteristics
(Ta=25°C, V
CC
=PV
CC
=3.3V, V
EN
=V
CC
)
Parameter
Standby Current
Bias Current
EN Low Voltage
EN High Voltage
EN Input Current
Oscillation Frequency
Pch FET ON Resistance
Nch FET ON Resistance
Output Voltage
ITH S
I
nk Current
ITH Source Current
UVLO Threshold Voltage
UVLO Release Voltage
Soft Start Time
Timer Latch Time
Output Short circuit Threshold Voltage
Symbol
I
STB
I
CC
V
ENL
V
ENH
I
EN
f
OSC
R
ONP
R
ONN
V
OUT
I
THSI
I
THSO
V
UVLO1
V
UVLO2
t
SS
t
LATCH
V
SCP
Limit
Min
-
-
-
2.0
-
0.8
-
-
3.250
10
10
3.6
3.65
0.5
1
-
Typ
0
250
GND
V
CC
1
1
200
150
3.300
20
20
3.8
3.90
1
2
1.65
Max
10
450
0.8
-
10
1.2
320
270
3.350
-
-
4.0
4.2
2
3
2.31
Unit
μA
μA
V
V
μA
MHz
mΩ
mΩ
V
μA
μA
V
V
ms
ms
V
SCP/TSD operated
V
OUT
=3.3V to 0V
V
OUT
=3.6V
V
OUT
=3.0V
V
CC
=5V to 0V
V
CC
=0V to 5V
PV
CC
=5V
PV
CC
=5V
Standby mode
Active mode
V
EN
=5V
Conditions
EN=GND
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© 2012 ROHM Co., Ltd. All rights reserved.
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BD9111NV
Typical Performance Curves
Datasheet
Ta=25°C
I
O
=2A
Output Voltage: V
OUT
[V]
Output Voltage: V
OUT
[v]
V
CC
=5V
Ta=25°C
I
O
=0A
Input Voltage: V
CC
[V]
Figure 4. Output Voltage vs Input Voltage
EN Voltage: V
EN
[V]
Figure 5. Output Voltage vs EN Voltage
Output Voltage: V
OUT
[V]
V
CC
=5V
Ta=25°C
Output Voltage: V
OUT
[V]
V
CC
=5V
I
O
=0A
Output Current: I
OUT
[A]
Figure 6. Output Voltage vs Output Current
Temperature: Ta [°C ]
Figure 7. Output Voltage vs Temperature
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© 2012 ROHM Co., Ltd. All rights reserved.
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02.Oct.2014 Rev.002
BD9111NV
Typical Performance Curves - continued
Datasheet
V
CC
=5V
V
CC
=5V
Ta=25°C
Output Current: I
OUT
[mA]
Figure 8. Efficiency vs Output Current
Frequency: f
OSC
[MHz]
Efficiency: η [%]
Temperature: Ta[˚C]
Figure 9. Frequency vs Temperature
V
CC
=5V
V
CC
=5V
ON Resistance: R
ON
[Ω]
PMOS
NMOS
Temperature: Ta[°C]
Figure 10. On-Resistance vs Temperature
EN Voltage: V
EN
[V]
Temperature: Ta[°C]
Figure 11. EN Voltage vs Temperature
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
5/21
TSZ02201-0J3J0AJ00100-1-2
02.Oct.2014 Rev.002
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