4.5V to 5.5V, 2.0A 1ch
Synchronous Buck Converter Integrated FET
BD8961NV
●General
Description
ROHM’s high efficiency step-down switching
regulator BD8961NV is a power supply designed to
produce a low voltage including 3.3 volts from 5
volts power supply line. Offers high efficiency with
synchronous rectifier. Employs a current mode
control system to provide faster transient response
to sudden change in load.
●Features
Offers fast transient response with current mode
PWM control system.
Offers highly efficiency for all load range with
synchronous rectifier (Nch/Pch FET)
Incorporates soft-start function.
Incorporates thermal protection and ULVO
functions.
Incorporates short-current protection circuit with
time delay function.
Incorporates shutdown function
●Key
Specification
Input voltage range:
Output voltage range:
Output current:
Switching frequency:
Pch FET ON resistance:
Nch FET ON resistance:
Standby current:
Operating temperature range:
●Packages
SON008V5060
4.5V to 5.5V
3.3V(Typ.)
2.0A (Max.)
1.0MHz(Typ.)
200mΩ(Typ.)
150mΩ(Typ.)
0μA (Typ..)
-25℃ to +105℃
5.0mm x 6.0mm x 1.0mm
●Applications
Power supply for LSI including DSP, Micro computer
and ASIC
●Typical
Application Circuit
V
CC
Cin
EN
V
CC
,PV
CC
SW
L
V
OUT
V
OUT
V
OUT
ESR
R
O
ITH
GND,PGND
C
O
R
ITH
C
ITH
Fig.1 Typical application
○Product
structure：Silicon monolithic integrated circuit
www.rohm.com
© ROHM Co., Ltd. All rights reserved.
TSZ22111½14½001
○This
product is not designed protection against radioactive rays.
1/16
TSZ02201-0J3J0AJ00020-1-2
02.MAR.2012 Rev.001
BD8961NV
●Pin
Configuration
TOP VIEW
VOUT
V
CC
ITH
GND
1
2
3
4
8
7
6
5
EN
PV
CC
SW
PGND
Datasheet
Fig.2 Pin Configuration
●Pin
Description
Pin No.
1
2
3
4
5
6
7
8
Pin name
VOUT
V
CC
ITH
GND
PGND
SW
PV
CC
EN
PIN function
Output voltage pin
V
CC
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)
●Block
Diagram
Fig.3 Block Diagram
www.rohm.com
© ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
2/16
TSZ02201-0J3J0AJ00020-1-2
02.MAR.2012 Rev.001
BD8961NV
●Absolute
Maximum Ratings
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
Datasheet
Symbol
V
CC
PV
CC
V
EN
V
SW
,V
ITH
Pd1
Pd2
Topr
Tstg
Tjmax
Ratings
-0.3 to +7
-0.3 to +7
＊
1
＊
1
Unit
V
V
V
V
mW
mW
℃
℃
℃
-0.3 to +7
-0.3 to +7
900
＊
2
＊
3
3900
-25 to +105
-55 to +150
+150
Pd should not be exceeded.
Derating in done 7.2mW/℃ for temperatures above Ta=25℃, Mounted on 70mm×70mm×1.6mm Glass Epoxy PCB (the density of copper:3%)
Derating in done 31.2mW/℃ for temperatures above Ta=25℃, Mounted on JESD51-7.
●Operating
Ratings
(Ta=25℃)
Parameter
V
CC
Voltage
PV
CC
Voltage
EN Voltage
SW average output current
＊4
Symbol
V
CC
P
VCC
V
EN
Isw
*4
*4
*4
Ratings
Min.
4.5
4.5
0
-
Typ.
5.0
5.0
-
-
Max.
5.5
5.5
VCC
2.0
Unit
V
V
V
A
Pd should not be exceeded.
●Electrical
Characteristics(Ta=25℃,
V
CC
=PV
CC
=3.3V, 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
SI
nk current
ITH
S
ource
C
urrent
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
Min.
-
-
-
2.0
-
0.8
-
-
3.250
10
10
3.6
3.65
0.5
1
-
Limits
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
OUT
Conditions
EN=GND
Standby mode
Active mode
V
EN
=5V
P
VCC
=5V
P
VCC
=5V
V
OUT
=3.6V
V
OUT
=3.0V
V
CC
=5→0V
V
CC
=0→5V
SCP/TSD operated
V
OUT
=3.3→0V
www.rohm.com
© ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
3/16
TSZ02201-0J3J0AJ00020-1-2
02.MAR.2012 Rev.001
Programming Basics
京公网安备 11010802033920号
EEWORLD
