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STRUCTURE
PRODUCT NAME
TYPE
FEATURES
Silicon Monolithic Integrated Circuit
1ch DC／DC PWM Converter IC built in synchronous rectifier
BD89630EFJ
・Output
Voltage：Adjustable(1.0½2.5Ｖ), Output Current：2.0A
・High
Efficiency and Fast Transient Response
○ABSOLUTE
MAXIMUM RATING（Ta=25℃）
Parameter
Power Supply Voltage
EN Voltage
SW・COMP Voltage
Power Dissipation 1
Power Dissipation 2
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
1
Symbol
V
CC
V
EN
V
SW
, V
COMP
Pd1
Pd2
Topr
Tstg
Tjmax
Limit
-0.3½+7 *
-0.3½+7
-0.3½+7
0.5 *
2
3
1
Unit
V
V
V
W
W
℃
℃
℃
3.76 *
-25½+85
-55½+150
+150
* Pd, ASO and Tjmax=150℃ should not be exceeded.
2
* Reduced by 4.0mW for increase in Ta of 1℃ above 25℃.
3
* 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)
○OPERATING
CONDITIONS（Ta=-25½+85℃）
Parameter
Power Supply Voltage
EN Voltage
Output Voltage range
SW Average Output Current
4
Symbol
V
CC
V
EN
V
OUT
I
SW
Min.
2.7
0
1.0
-
Typ.
5.0
-
-
-
Max.
5.5
Vcc
2.5*
2.0*
4
5
Unit
V
V
V
A
* In case set output voltage 1.6V or more, VccMin. = Vout +1.8V
5
* Pd should not be exceeded.
★This
product is not designed for protection against radioactive rays.
REV. B
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○ELECTRICAL
CHARACTERISTICS
(Unless otherwise specified , Ta=25℃ V
CC
=5V, EN=V
CC
, R
1
=30kΩ, R
2
=7.5kΩ)
Parameter
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
Symbol
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
Min.
-
-
-
2.0
-
0.8
-
-
0.788
10
10
2.400
2.425
0.5
1
-
Limit
Typ.
5
350
GND
V
CC
1.25
1
145
80
0.800
25
25
2.500
2.550
1
2
Max.
20
600
0.3
-
10
1.2
290
160
0.812
-
-
2.600
2.700
2
4
Unit
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
Condition
EN=GND
V
OUT
×0.5
V
OUT
×0.7
○PHYSICAL
DIMENSION
○BLOCK
DIAGRAM・APPLICATION CIRCUIT
V
CC
EN 3
D89630
VREF
Current
Comp
Current
Sense/
Protect
+
Driver
Logic
V
CC
4
Input
Lot No.
+
Gm Amp
R Q
S
5
6
SW
Output
+
SLOPE
CLK
OSC
V
CC
UVLO
TSD
SCP
Soft
Start
GND
2
8
ADJ
1
COMP
HTSOP-J8 (unit:mm)
○
SETTING THE OUTPUT VOLTAGE
L
6
Vout
SW
R2
8
ADJ
R1
○PIN
No., PIN NAME
PIN No.
1
2
3
4
5
6
7
8
PIN Name
COMP
GND
EN
V
CC
SW
SW
N.C
ADJ
The Output Voltage is set by the external resistor divider and is calculated as：
Vout=(R2/R1+1)×VADJ
・・・ ①
V
ADJ
：ADJ
pin reference Voltage (0.8V typ)
It’ s possible to adjust the output voltage by R1 and R2. (The Vout must be set from 1.0V to 2.5V.)
Resistance R1≒10kΩ is recommended. Please confirm the ripple voltage,
if you can use the resistance more than 100kΩ.
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○NOTES
FOR USE
(1) Absolute Maximum Ratings
We are careful enough for quality control about this IC. So, there is no problem under normal operation, excluding that it
exceeds the absolute maximum ratings. However, this IC might be destroyed when the absolute maximum ratings, such
as impressed voltages or the operating temperature range, is exceeded, and whether the destruction is short circuit mode
or open circuit mode cannot be specified. Pleases take into consideration the physical countermeasures for safety, such
as fusing, if a particular mode that exceeds the absolute maximum rating is assumed.
(2) GND Potential
Make setting of the potential of the GND terminal so that it will be maintained at the minimum in any operating
state. Furthermore, check to be sure no terminals are at a potential lower than the GND voltage except for SW,
GND terminals including an actual electric transient.
(3)
Thermal design
Do not exceed the power dissipation (Pd) of the package specification rating under actual operation, and
please design enough temperature margins.
(4)
Short circuit mode between terminals and wrong mounting
In order to mount the IC on a set PCB, pay thorough attention to the direction and offset of the ICs.
Erroneous mounting can destroy the IC. Furthermore, if a short circuit occurs due to foreign matters
entering between terminals or between the terminal and the power supply or the GND terminal, the IC can
destroy
(5) Operation in Strong electromagnetic field
Be noted that using the IC in the strong electromagnetic radiation can cause operation failures.
(6) ASO(Area of Safety Operation.)
Do not exceed the maximum ASO and the absolute maximum ratings of the output driver.
(7)
TSD(Thermal Shut-Down) circuit
The thermal shutdown circuit (TSD circuit) is built in this product. When IC chip temperature becomes
higher, the thermal shutdown circuit operates and turns output off. The guarantee and protection of IC are
not purpose. Therefore, please do not use this IC after TSD circuit operates, nor use it for assumption that
operates the TSD circuit.
(8) GND wiring pattern
Use separate ground lines for control signals and high current power driver outputs. Because these high
current outputs that flows to the wire impedance changes the GND voltage for control signal. Therefore,
each ground terminal of IC must be connected at the one point on the set circuit board. As for GND of
external parts, it is similar to the above-mentioned.
(9) Operation in supply voltage range
Functional Circuit operation is guaranteed within operation ambient temperature, as long as it is within
operation supply voltage range. The electrical characteristics standard value cannot be guaranteed.
However, there is no drastic variation in these values, as long as it is within operation supply voltage range.
(10) We are confident in recommending the above application circuit example, but we ask that you carefully
check the characteristics of this circuit before using it. If using this circuit after modifying other external
circuit constants, be careful to ensure adequate margins for variation between external devices and this IC,
including not only static characteristics but also transient characteristics. If switching noise is high, please
insert the schottky barrier diodes between SW pin and GND pin.
(11) Overcurrent protection circuit
The overcurrent protection circuit is built in the output. If the protection circuit operates more than for
specific hours (when the load is short.), the output will be latched in OFF. The output returns when EN is
turned on or UVLO is released again. These protection circuits are effective in the destruction prevention
by broken accident. Please do not use in continuous circuit operation.
(12) Selection of inductor
It is recommended to use an inductor with a series resistance element (DCR) 0.1Ω or less. Especially, in
case output voltage is set 1.6V or more, note that use of a high DCR inductor will cause an inductor loss,
resulting in decreased output voltage. Should this condition continue for a specified period (soft start time +
timer latch time), output short circuit protection will be activated and output will be latched OFF. When
using an inductor over 0.1Ω, be careful to ensure adequate margins for variation between external devices
and this IC, including transient as well as static characteristics. Furthermore, in any case, please start up
the output with EN after supply voltage is within operation range(2.7½5.5V).
REV. B
Notice
Notes
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The content specified herein is for the purpose of introducing ROHM's products (hereinafter
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which can be obtained from ROHM upon request.
Examples of application circuits, circuit constants and any other information contained herein
illustrate the standard usage and operations of the Products. The peripheral conditions must
be taken into account when designing circuits for mass production.
Great care was taken in ensuring the accuracy of the information specified in this document.
However, should you incur any damage arising from any inaccuracy or misprint of such
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The technical information specified herein is intended only to show the typical functions of and
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The Products specified in this document are intended to be used with general-use electronic
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R1120A
