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PDF BD1484EFJ Data sheet ( Hoja de datos )
| Número de pieza | BD1484EFJ | |
| Descripción | Synchronous Buck Converter integrated FET | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
4.2V to 18V, 3A 1ch
Synchronous Buck Converter integrated FET
BD1484EFJ
●General Description
The BD1484EFJ is a synchronous step-down
switching regulator that integrates 2 low ON-resistance
N-channel MOSFETs. It achieves 3A continuous
output current over a wide input supply range. Current
mode operation provides fast transient response and
easy phase compensation.
●Features
Low ESR Output Ceramic Capacitors are
Available
Low Standby Current during Shutdown Mode
380 kHz Fixed Operating Frequency
Feedback voltage
0.925V ± 1.5%(Ta=25℃),
0.925V ± 2.0%(Ta=-25℃ to 85℃)
Protection Circuits
Under Voltage Lockout Protection
Thermal Shutdown
Over Current Protection
●Key Specifications
Input voltage range:
4.2V to 18V
Output voltage range:
0.925V to (Vin×0.7)V
Output current:
3.0A (Max.)
Switching Frequency
380kHz(Typ.)
Hi-side FET On-resistance:
0.15Ω(Typ.)
Lo-side FET On-resistance:
0.13Ω(Typ.)
Standby current:
15μA (Typ.)
Operating temperature range:
-40℃ to +85℃
●Package
HTSOP-J8
(Typ.) (Typ.) (Max.)
4.90mm x 6.00mm x 1.00mm
●Applications
Distributed Power System
Pre-Regulator for Linear Regulator
●Typical Application Circuit
C_SS
0.1μF
HTSOP-J8
C_PC
3300pF
R_PC
7.5kΩ
R_DW
15kΩ
R_UP
39kΩ
Thermal Pad
(to be shorted to GND)
VIN 12V
C_VC1
10μF
L
10µH
VOUT 3.3V
C_CO1
20μF
※R_BS protect from VIN-BST short destruction.
Fig.1 Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○This product is not designed protection against radioactive rays.
TSZ02201-0333AD100140-1-2
1/17 06.Aug.2012 Rev.001
1 page  
BD1484EFJ
●Typical Performance Curves (Continued)
(Unless otherwise specified, VIN= 12V Ta = 25℃)
Fig.8 Hi,Low-Side
On-resistance
Datasheet
390
385
380
375
370
365
360
-40 -20
0
20 40 60 80
TEMP (°C)
Fig.9 Operating Frequency
95
90
85
80
75
70
65
60
55
50
0
1000
2000
Io[m A]
3000
Fig.10 STEP Down Efficiency
(VIN= 12V VOUT= 3.3V L=10µH)
Fig.11 OverCurrent Protection
(VOUT is shorted to GND)
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
5/17
TSZ02201-0333AD100140-1-2
06.Aug.2012 Rev.001
5 Page 
BD1484EFJ
Soft Start Function
COMP
ERRAMP
+
+-
↓↓ISS 10µA
SS
CSS
Fig.24
EN Function
VIN
EN 124 kΩ(typ.)
254 kΩ(typ.)
REN
ON/OFF
Signal
Fig.25
EN
Datasheet
An adjustable soft-start function to prevent high inrush current
during start-up is available.
The soft-start time is set by the external capacitor connected to
SS pin.
The soft start time is given by;
TSS [s] = 2.2 x Css / ISS
Setting CSS= 0.1µF;
TSS= 2.2 x 0.1µ / 10µ = 22 [ms]
Please confirm the overshoot of the output voltage and inrush
current when deciding the SS capacitor value.
The EN terminal control IC’s shut down.
Leaving EN terminal open makes IC shutdown.
To start the IC, EN terminal should be connected to VIN or the
other power source output.
When the EN voltage exceed 1.2V (typ.), the IC start operating.
The IC also has the hysteresis voltage 0.2V (typ.) of EN when
EN voltage falls down.
(Attention1)
Chattering happens if standing lowering speed is slow when
standing of EN pin is lowered.
The reverse current in which the input side and the pressure
operation are done from the output side is generated when
chattering operates with the output voltage remained, and
there is a case to destruction.
Please set to stand within 100us when you control ON/OFF by
the EN signal.
This necessity doesn't exist when EN pin is connected with
VIN and EN is not controlled.
The control by open drain MOSFET shown in a left chart is
recommended.
(Attention 2)
In case the output voltage is used in a setting of more than 5V,
when EN signal is turned off, please start up EN again after
output voltage is discharged enough.
If EN is turned on although output voltage isn’t discharged
enough, BST circuit doesn’t operate normally.
As the result, the IC is not operated, in the worst case, it is
destroyed.
www.rohm.com
©2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/17
TSZ02201-0333AD100140-1-2
06.Aug.2012 Rev.001
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet BD1484EFJ.PDF ] | |
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