Datasheet
2.7V to 5.5V, 2A 1ch
Synchronous Buck Converter integrated FET
BD89630EFJ
●General
Description
ROHM’s high efficiency step-down switching regulator
BD89630EFJ 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 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
●Applications
Power supply for LSI including DSP, Micro computer
and ASIC
●Key
Specification
Input voltage range:
Output voltage range:
Average output Current:
Switching frequency:
Pch FET ON resistance:
Nch FET ON resistance:
Standby current:
Operating temperature range:
2.7V to 5.5V
1.0V to 2.5V
2A(Max.)
1MHz(Typ.)
145mΩ(Typ.)
80mΩ(Typ.)
5μA (Typ.)
-25℃ to +85℃
●Package
HTSOP-J8
(Typ.)
(Typ.)
(Max.)
4.90mm x 6.00mm x 1.00mm
●Typical
Application Circuit
HTSOP-J8
V
CC
Cin
EN
V
CC
SW
L
V
OUT
R
FB1
V
ADJ
ADJ
COMP
GND
C
O
R
FB2
V
ADJ
R
COMP
C
COMP
Fig.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 is not designed protection against radioactive rays.
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BD89630EFJ
●Pin
configuration(TOP VIEW)
Datasheet
COMP
GND
EN
V
CC
ADJ
N.C
SW
SW
Fig.2 Pin configuration
●Pin
Description
Pin No.
Pin name
1
2
3
4
5
6
7
8
COMP
GND
EN
V
CC
SW
SW
N.C
ADJ
Ground
PIN function
GmAmp output pin/Connected phase compensation capacitor
Enable pin(Active High, Open Active)
VCC power supply input pin
Pch/Nch FET drain output pin
Pch/Nch FET drain output pin
Non Connect
Output voltage detect pin
●Block
Diagram
V
CC
SW
SW
GND
Fig.3 Block Diagram
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BD89630EFJ
Datasheet
●Absolute
Maximum Ratings
Parameter
V
CC
Voltage
EN Voltage
SW,COMP Voltage
Power Dissipation 1
Power Dissipation 2
Operating temperature range
Storage temperature range
Maximum junction temperature
*1
*2
*3
Symbol
V
CC
V
EN
V
SW
,V
COMP
Pd1
Pd2
Topr
Tstg
Tjmax
Ratings
-0.3 to +7
*1
-0.3 to +7
-0.3 to +7
0.5
*2
*3
Unit
V
V
V
W
W
℃
℃
℃
3.76
-25 to +85
-55 to +150
+150
Pd should not be exceeded.
Reduced by 4.0mW for increase in Ta of 1℃ above 25℃.
Reduced by 30.0mW for increase in Ta of 1℃ above 25℃.
(when mounted on a board 70.0mm
×
70.0mm
×
1.6mm Glass-epoxy PCB)
●Recommended
Operating Ratings
(Ta=-25 to +85℃)
Parameter
Power Supply Voltage
EN Voltage
Output voltage range
SW average output current
*4
*5
Symbol
V
CC
V
EN
V
OUT
Isw
Ratings
Min.
2.7
*5
0
1.0
-
Typ.
5.0
-
-
-
Max.
5.5
Vcc
2.5
*4
*5
Unit
V
V
V
A
2.0
In case set output voltage 1.6V or more, VccMin. = Vout +2.25V
Pd should not be exceeded.
●Electrical
Characteristics
(Unless otherwise specified , Ta=25℃ V
CC
=5V, EN=V
CC
, R
1
=20kΩ, R
2
=7.5kΩ)
Limit
Parameter
Symbol
Unit
Conditions
Min.
Typ.
Max.
Standby Current
Bias Current
EN Low Voltage
EN High Voltage
EN Current
Oscillation Frequency
Pch FET ON Resistance
Nch FET ON Resistance
ADJ Reference Voltage
COMP S
INK
Current
COMP Source Current
UVLO Threshold Voltage
UVLO Hysteresis Voltage
Soft Start Time
Timer Latch Time
Output Short circuit Threshold Voltage
I
STB
I
CC
V
ENL
V
ENH
I
EN
F
OSC
R
ONP
R
ONN
V
ADJ
I
COSI
I
COSO
V
UVLO
1
V
UVLO
2
T
SS
T
LATCH
V
SCP
-
-
-
2.0
-
0.8
-
-
0.788
10
10
2.400
2.425
0.5
1
-
5
350
GND
V
CC
1.25
1
145
80
0.800
25
25
2.500
2.550
1
2
V
OUT
×0.5
20
600
0.3
-
10
1.2
290
160
0.812
-
-
2.600
2.700
2
4
V
OUT
×0.7
µA
µA
V
V
µA
MHz
mΩ
mΩ
V
µA
µA
V
V
ms
ms
V
V
OUT
=1.0V→0V
V
ADJ
=1.0V
V
ADJ
=0.6V
Vcc=5V→0V
Vcc=0V→5V
V
CC
=5V
V
CC
=5V
Stand-by Mode
Active Mode
V
EN
=5V
EN=GND
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BD89630EFJ
●Typical
Performance Curves
Datasheet
Fig.4 Vcc-Vout
Fig.5 V
EN
-Vout
Fig.6 I
OUT
-V
OUT
Fig. 7 Ta-V
OUT
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BD89630EFJ
Datasheet
100
90
80
【VOUT=1.1V】
VCC=5.0V
Ta=25℃
EFFICIENCY[%]
70
60
50
40
30
20
10
0
10
100
1000
OUTPUT CURRENT:I
OUT
[mA]
Fig.8 Efficiency
10000
Fig.9 Ta-F
OSC
Fig.10 Ta-R
ONN
, R
ONP
Fig.11 Ta-V
EN
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©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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