BA3257HFP-TR [ROHM]
Regulator, 2 Output, BIPolar,;
| 型号： | BA3257HFP-TR |
| 厂家： | 
ROHM |
| 描述： | Regulator, 2 Output, BIPolar, |
| 文件： | 总3页 (文件大小：223K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Dual Low Drop Out Regulator
Ceramic Capacitor Available
BA3257FP/HFP
Description
Dimension (Unit : mm)
BA3257FP/HFP is a power supply IC in which
2-output series regulators are incorporated into
a power package (TO252-5/HRP-5). 2-outputs
are 3.3V and a variable output.(Above 1.5V can
be set.) Each current is 1A. Ceramic capacitor
is available for output.
BA3257FP
2.3±0.2
6.5±0.2
5.1−+00..12
0.5±0.1
2-C0.5
2
1
3
4
5
1.27
0.5±0.1
1.0±0.2
0.5
Features
TO252-5
1) 3.3V/1A and Variable(1.25V standard)/1A
2) Output ceramic capacitor available
3) Output voltage accuracy :+/-2%
BA3257HFP
4) Built-in over-current and thermal protection circuit
5) TO252-5 package and HRP-5 package
9.39±0.125
1.905±0.1
8.82±0.1
(5.59)
1
2
3
4
5
Applications
HDD/DVD
1.2575
5.5°
4.5°
4.5°+−
0.27
+
−
0.1
0.05
S
1.72
0.73±0.1
D
0.08
S
HRP-5
Absolute Maximum Ratings (Ta=25˚C)
Parameter
Power supply voltage
Symbol
VCC
Limits
15
2300
1300
~
Unit
V
∗1
∗2
HRP-5
TO252-5
Power
Pd
mW
dissipation
0
55
+85
+150
Topr
Tstg
Operating temperature range
Storage temperature range
˚C
˚C
-
~
∗1 Derating : 18.4mW/˚C for operation above Ta=25˚C PCB (70mmx70mm, t=1.6mm) glass epoxy mounting.
∗2 Derating : 10.4mW/˚C for operation above Ta=25˚C PCB (70mmx70mm, t=1.6mm) glass epoxy mounting.
Recommended Operating Conditions (Ta=25˚C)
Parameter
Symbol
Min.
4.75
Typ.
Max.
14.0
Unit
V
Power supply voltage
VCC
-
Electrical characteristics (Unless otherwise noted; Ta=25˚C, Vcc=5V, R1=R2=5kΩ)
Parameter
Circuit current
Line regulation 1,2
Load regulation 1,2
[3.3V output]
Symbol
Min.
-
-
Typ.
3
5
5
Max.
5
15
20
Unit
mA
mV
mV
Conditions
Io1=0mA, Io2=0mA
Vcc=4.75 → 14V, Io1=5mA
Io2=5mA → 1A
Ib
∆VLINE1,2
∆VLOAD1,2
-
Io1=50mA
Io1=1A
Output voltage
Dropout voltage
Output current
3.234 3.300 3.366
V
V
A
Vo1
∆VD1
-
1.1
1.3
1.0
- -
Io1
[Variable output]
Reference voltage
Dropout voltage
Output current
Io2=50mA
V
V
A
1.225 1.250 1.275
Io2=1A, R1=8.2kΩ, R2=5kΩ
-
1.1
1.3
- -
1.0
Application Circuit
VO1
5
3.3V
Current
Limit
CO1
1µF
VOUT2=VREF X (1+R1/R2)+IADJ X R1
VO2
4
ADJ
Current
Limit
CO2
1µF
GND
FIN
Thermal
Shutdown
ADJ
2
R1
R2
VIN
VCC
VREF
1
CIN
3.3µF
BA3257FP/HFP
Appendix
Notes
No technical content pages of this document may be reproduced in any form or transmitted by any
means without prior permission of ROHM CO.,LTD.
The contents described herein are subject to change without notice. The specifications for the
product described in this document are for reference only. Upon actual use, therefore, please request
that specifications to be separately delivered.
Application circuit diagrams and circuit constants contained herein are shown as examples of standard
use and operation. Please pay careful attention to the peripheral conditions when designing circuits
and deciding upon circuit constants in the set.
Any data, including, but not limited to application circuit diagrams information, described herein
are intended only as illustrations of such devices and not as the specifications for such devices. ROHM
CO.,LTD. disclaims any warranty that any use of such devices shall be free from infringement of any
third party's intellectual property rights or other proprietary rights, and further, assumes no liability of
whatsoever nature in the event of any such infringement, or arising from or connected with or related
to the use of such devices.
Upon the sale of any such devices, other than for buyer's right to use such devices itself, resell or
otherwise dispose of the same, no express or implied right or license to practice or commercially
exploit any intellectual property rights or other proprietary rights owned or controlled by
ROHM CO., LTD. is granted to any such buyer.
Products listed in this document use silicon as a basic material.
Products listed in this document are no antiradiation design.
The products listed in this document are designed to be used with ordinary electronic equipment or devices
(such as audio visual equipment, office-automation equipment, communications devices, electrical
appliances and electronic toys).
Should you intend to use these products with equipment or devices which require an extremely high level of
reliability and the malfunction of with would directly endanger human life (such as medical instruments,
transportation equipment, aerospace machinery, nuclear-reactor controllers, fuel controllers and other
safety devices), please be sure to consult with our sales representative in advance.
About Export Control Order in Japan
Products described herein are the objects of controlled goods in Annex 1 (Item 16) of Export Trade Control
Order in Japan.
In case of export from Japan, please confirm if it applies to "objective" criteria or an "informed" (by MITI clause)
on the basis of "catch all controls for Non-Proliferation of Weapons of Mass Destruction.
Appendix1-Rev1.0
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