Datasheet
4.75V to 18V, 2A/3A/4A 1ch
Buck Converter with Integrated FET
BD9325FJ
BD9326EFJ BD9327EFJ
Key Specifications
Input Voltage Range:
Output Current
BD9327EFJ :
BD9326EFJ:
BD9325FJ:
Switching Frequency:
High Side FET ON-Resistance
BD9327EFJ:
BD9326EFJ:
BD9325FJ:
Low Side FET ON-Resistance:
Standby Current:
Operating Temperature Range:
4.75V to 18V
4.0A (Max)
3.0A (Max)
2.0A (Max)
380kHz (Typ)
0.11Ω(Typ)
0.12Ω(Typ)
0.16Ω(Typ)
10Ω(Typ)
80μA
(Typ)
-40°C to +85°C
D(Typ)
H(Max)
General Description
The BD9325FJ, BD9326EFJ and BD9327EFJ are
step-down regulators with built-in low resistance high
side N-Channel MOSFET. These ICs can supply
continuous output current of
2A / 3A / 4A
respectively over a wide input range, and provides
not only fast transient response, but also easy phase
compensation because of current mode control.
Features
Low ESR Output Ceramic Capacitors are Available
Low Standby Current during Shutdown Mode
Feedback Voltage
0.9V ± 1.5%(Ta=25°C)
0.9V ± 3.0%(Ta=-25°C to +85°C)
Protection Circuit:
Under Voltage Protection
Thermal Shutdown
Over-Current Protection
Packages
W(Typ)
Applications
Distributed Power System
Pre-Regulator for Linear Regulator
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
SOP-J8
4.90mm x 6.00mm x 1.65mm
Typical Application Circuit
C_PC1
3300pF
C_SS
0.1μF
COMP
SS
EN
R_PC
15k
FB
R_DW
10k
R_UP
27k
Thermal Pad
(For BD9326EFJ, BD9327EFJ)
BST
GND
VIN
SW
L
V
IN
=12V
C_VC1
10μF
D
C_BS
0.1μF
10μH
V
OUT
= 3.3V
C_CO1
20μF
Figure 1. Typical Application Circuit
〇Product
structure : Silicon monolithic integrated circuit
.
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111
•
14
•
001
〇This
product has no designed protection against radioactive rays
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BD9325FJ
BD9326EFJ BD9327EFJ
Block Diagram
Pin Configuration
V
IN
(TOP
VIEW)
1
2
3
4
BST
VIN
SW
GND
SS
EN
COMP
FB
8
7
6
5
Figure 2. Pin Configuration
Figure 3. Block Diagram
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
BST
VIN
SW
GND
FB
COMP
EN
SS
Function
High-side gate drive boost input
Power supply input terminal
Power switching output
Ground terminal
Feedback input
Compensation node
Enable input
Soft start control input
Lineup
High Side FET
ON-Resistance
(Typ)
0.16
Ω
0.12
Ω
0.11
Ω
Output Current
(Max)
2.0 A
3.0 A
4.0 A
SOP-J8
HTSOP-J8
HTSOP-J8
Package
Reel of 2500
Reel of 2500
Reel of 2500
Orderable
Part Number
BD9325FJ-E2
BD9326EFJ-E2
BD9327EFJ-E2
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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BD9325FJ
BD9326EFJ BD9327EFJ
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Supply Voltage [VIN]
Switch Voltage [SW]
Power Dissipation for HTSOP-J8
Power Dissipation for SOP-J8
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
BST Voltage
EN Voltage
All Other Pins
Symbol
V
IN
V
SW
Pd1
Pd2
Topr
Tstg
Tjmax
V
BST
V
EN
V
OTH
Rating
20
20
3.76
(Note 1)
0.67
(Note 2)
-40 to +85
-55 to +150
150
V
SW
+7
20
7
Unit
V
V
W
W
°C
°C
°C
V
V
V
(Note 1) Mounted on 4- layer 70mmx70mmx1.6mm board. Reduce by 30.08mW/°C for Ta above 25°C.
(Note 2) Mounted on 1- layer 70mmx70mmx1.6mm board. Reduce by 5.4mW/°C for Ta above 25°C.
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= -40°C to +85°C)
Parameter
Supply Voltage
SW Voltage
Output Current for BD9325FJ
Output Current for BD9326EFJ
Output Current for BD9327EFJ
(Note 3) Pd, ASO should not be exceeded
Symbol
V
IN
V
SW
I
SW2
I
SW3
I
SW4
Min
4.75
-0.5
-
-
-
Rating
Typ
12
-
-
-
-
Max
18
+18
2
(Note 3)
3
(Note 3)
4
(Note 3)
Unit
V
V
A
A
A
Electrical Characteristics (Unless otherwise specified V
IN
=12V Ta=25°C)
Parameter
Error Amplifier Block
FB Input Bias Current
Feedback Voltage1
Feedback Voltage2
SW Block – SW
Hi-Side FET ON-Resistance for
BD9325FJ
Hi-Side FET ON-Resistance for
BD9326EFJ
Hi-Side FET ON-Resistance for
BD9327EFJ
Low-Side FET ON-Resistance
Leak Current N-Channel
Switch Current Limit for BD9325FJ
Switch Current Limit for BD9326EFJ
Switch Current Limit for BD9327EFJ
Maximum Duty Cycle
General
Enable Sink Current
Enable Threshold Voltage
Under Voltage Lockout Threshold
Under Voltage Lockout Hysteresis
Soft Start Current
Soft Start Time
Operating Frequency
Circuit Current
Standby Current
(Note 4) See the lineup table .
Symbol
Min
-
0.886
0.873
-
-
-
-
-
2.5
3.5
4.5
-
86
1.1
4.05
-
23
-
300
-
-
Limit
Typ
0.1
0.900
0.900
0.16
0.12
0.11
10
0
-
-
-
90
181
1.18
4.40
0.1
41
1.6
380
2.1
80
Max
2
0.914
0.927
-
-
-
-
10
-
-
-
-
275
1.4
4.75
-
62
-
460
4.3
170
Unit
Conditions
I
FB
V
FB1
V
FB2
R
ON2
R
ON3
R
ON4
R
ONL
I
LEAKN
I
LIMIT2
I
LIMIT3
I
LIMIT4
M
DUTY
I
EN
V
EN
V
UVLO
V
HYS
I
SS
t
SS
f
OSC
I
CC
I
QUI
µA
V
V
Ω
Ω
Ω
Ω
µA
A
A
A
%
µA
V
V
V
µA
ms
kHz
mA
µA
Voltage Follower
Ta=-40°C to +85°C
I
SW
= -0.8A
(Note 4)
I
SW
= -0.8A
(Note 4)
I
SW
= -0.8A
(Note 4)
I
SW
= 0.1A
V
IN
= 18V, V
SW
= 0V
(Note 4)
(Note 4)
(Note 4)
V
FB
= 0V
V
EN
= 12V
V
IN
Rising
V
SS
= 0 V
C
SS
= 0.1 µF
V
FB
= 1.5V, V
EN
= 12V
V
EN
= 0V
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
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TSZ02201-0323AAJ00030-1-2
05.Sep.2014 Rev.002
BD9325FJ
BD9326EFJ BD9327EFJ
Typical Performance Curves
(Unless otherwise specified, V
IN
= 12V Ta = 25°C)
Icc :[mA]
V
IN
:[V]
Figure 4. Circuit Current vs Input Voltage
(No Switching)
Icc :[μA]
V
IN
:[V]
Figure 5. Standby Current vs Input Voltage
(IC Not Active)
V
FB
:[V]
Figure 6. Input Bias Current vs
Feedback Voltage
Feedback Voltage :[V]
I
FB
:[μA]
Temperature :[ °C ]
Figure 7. Feedback Voltage vs
Temperature
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© 2012 ROHM Co., Ltd. All rights reserved.
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05.Sep.2014 Rev.002
BD9325FJ
BD9326EFJ BD9327EFJ
Typical Performance Curves - continued
390
380
Operating Frequency [kHz]
370
360
350
340
330
320
-40
-20
0
20
40
60
80
R
ON
:[Ω]
Ta: [°C]
Temperature :[
: [C]
TEMPERATURE
°C ]
Figure 8. Hi-Side ON-Resistance
vs Temperature
Figure 9. Operating Frequency vs
Temperature
Soft Start Time :[ms]
Efficiency : [%]
C
SS
: [μF]
I
OUT
: [A]
Figure 10. Efficiency vs Output Current
(V
IN
= 12V V
OUT
= 3.3V L=10µH)
Figure 11. Soft Start Time vs
Soft Start Capacitor
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111½15½001
5/19
TSZ02201-0323AAJ00030-1-2
05.Sep.2014 Rev.002
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