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Datasheet
4.75V to 18V, 2A/3A/4A 1ch
Buck Converter with Integrated FET
BD9325FJ BD9326EFJ BD9327EFJ
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
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
Packages
W(Typ) D(Typ) H(Max)
Applications
Distributed Power System
Pre-Regulator for Linear Regulator
Typical Application Circuit
HTSOP-J8
SOP-J8
4.90mm x 6.00mm x 1.00mm
4.90mm x 6.00mm x 1.65mm
C_SS
0.1μF
C_PC1
3300pF
R_PC
15k
R_DW
10k
R_UP
27k
Thermal Pad
(For BD9326EFJ, BD9327EFJ)
VIN=12V
C_VC1
10μF
L
D 10μH
VOUT = 3.3V
C_CO1
20μF
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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BD9325FJ BD9326EFJ BD9327EFJ
Pin Configuration
(TOP VIEW)
1 BST
2 VIN
3 SW
4 GND
SS 8
EN 7
COMP 6
FB 5
Block Diagram
VIN
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)
Package
Orderable
Part Number
2.0 A
3.0 A
4.0 A
SOP-J8
HTSOP-J8
HTSOP-J8
Reel of 2500
Reel of 2500
Reel of 2500
BD9325FJ-E2
BD9326EFJ-E2
BD9327EFJ-E2
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BD9325FJ BD9326EFJ BD9327EFJ
Absolute Maximum Ratings (Ta = 25°C)
Parameter
Symbol
Rating
Unit
Supply Voltage [VIN]
VIN 20 V
Switch Voltage [SW]
VSW 20 V
Power Dissipation for HTSOP-J8
Pd1
3.76 (Note 1)
W
Power Dissipation for SOP-J8
Pd2
0.67 (Note 2)
W
Operating Temperature Range
Topr -40 to +85 °C
Storage Temperature Range
Tstg -55 to +150 °C
Maximum Junction Temperature
Tjmax
150
°C
BST Voltage
VBST
VSW+7
V
EN Voltage
VEN 20 V
All Other Pins
VOTH
7
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
VIN
VSW
ISW2
ISW3
ISW4
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 VIN=12V Ta=25°C)
Parameter
Limit
Symbol Min Typ Max
Error Amplifier Block
FB Input Bias Current
IFB - 0.1 2
Feedback Voltage1
VFB1
0.886 0.900 0.914
Feedback Voltage2
VFB2
0.873 0.900 0.927
SW Block – SW
Hi-Side FET ON-Resistance for
BD9325FJ
Hi-Side FET ON-Resistance for
BD9326EFJ
Hi-Side FET ON-Resistance for
BD9327EFJ
RON2
RON3
RON4
- 0.16 -
- 0.12 -
- 0.11 -
Low-Side FET ON-Resistance
RONL
- 10 -
Leak Current N-Channel
ILEAKN
-
0 10
Switch Current Limit for BD9325FJ
ILIMIT2
2.5
-
-
Switch Current Limit for BD9326EFJ
ILIMIT3
3.5
-
-
Switch Current Limit for BD9327EFJ
ILIMIT4
4.5
-
-
Maximum Duty Cycle
MDUTY - 90 -
General
Enable Sink Current
IEN 86 181 275
Enable Threshold Voltage
VEN 1.1 1.18 1.4
Under Voltage Lockout Threshold
VUVLO
4.05 4.40 4.75
Under Voltage Lockout Hysteresis
VHYS
- 0.1 -
Soft Start Current
ISS 23 41 62
Soft Start Time
tSS - 1.6 -
Operating Frequency
fOSC 300 380 460
Circuit Current
ICC - 2.1 4.3
Standby Current
IQUI - 80 170
(Note 4) See the lineup table .
Unit Conditions
µA
V Voltage Follower
V Ta=-40°C to +85°C
Ω ISW= -0.8A (Note 4)
Ω ISW= -0.8A (Note 4)
Ω ISW= -0.8A (Note 4)
Ω ISW= 0.1A
µA VIN= 18V, VSW= 0V
A (Note 4)
A (Note 4)
A (Note 4)
% VFB= 0V
µA VEN= 12V
V
V VIN Rising
V
µA VSS= 0 V
ms CSS= 0.1 µF
kHz
mA VFB= 1.5V, VEN= 12V
µA VEN= 0V
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BD9325FJ BD9326EFJ BD9327EFJ
Typical Performance Curves
(Unless otherwise specified, VIN= 12V Ta = 25°C)
VIN :[V]
Figure 4. Circuit Current vs Input Voltage
(No Switching)
VIN :[V]
Figure 5. Standby Current vs Input Voltage
(IC Not Active)
VFB :[V]
Figure 6. Input Bias Current vs
Feedback Voltage
Temperature :[ °C ]
Figure 7. Feedback Voltage vs
Temperature
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BD9325FJ BD9326EFJ BD9327EFJ
Typical Performance Curves - continued
Ta: [°C]
Figure 8. Hi-Side ON-Resistance
vs Temperature
390
380
370
360
350
340
330
320
-40
-20 0
20 40 60
TTEeMmPpEeRraAtuTrUeR:E[ °:C[C] ]
80
Figure 9. Operating Frequency vs
Temperature
IOUT: [A]
Figure 10. Efficiency vs Output Current
(VIN= 12V VOUT= 3.3V L=10µH)
CSS: [μF]
Figure 11. Soft Start Time vs
Soft Start Capacitor
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© 2012 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
5/19
TSZ02201-0323AAJ00030-1-2
05.Sep.2014 Rev.002