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參數(shù)資料
| 型號： | LM345K-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Negative Three Amp Regulator |
| 中文描述： | 5 V FIXED NEGATIVE REGULATOR, MBFM2 |
| 文件頁數(shù)： | 2/6頁 |
| 文件大?。?/td> | 167K |
| 代理商： | LM345K-5.0 |
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales
Office/Distributors for availability and specifications.
(Note 3)
Input Voltage
20V
Input-Output Differential
20V
Power Dissipation
Internally Limited
Operating Junction Temperature Range
LM145
LM345
b
55
§
C to
a
150
§
C
0
§
C to
a
125
§
C
b
65
§
C to
a
150
§
C
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
300
§
C
Electrical Characteristics
(Note 1)
Limits
Parameter
Conditions
LM145
LM345
Units
Min
Typ
Max
Min
Typ
Max
Output Voltage
T
j
e
25
§
C, I
OUT
e
5 mA,
V
IN
e b
7.5
T
j
e
25
§
C
b
20V
s
V
IN
s
b
7.5V
T
j
e
25
§
C, V
IN
e b
7.5V
5 mA
s
I
OUT
s
3A
b
5.1
b
5.0
b
4.9
b
5.2
b
5.0
b
4.8
V
Line Regulation (Note 2)
5
15
5
25
mV
Load Regulation (Note 2)
30
75
30
100
mV
Output Voltage
b
20V
s
V
IN
s
b
7.8V
5 mA
s
I
OUT
s
3A
P
s
25W
T
MIN
s
T
j
s
T
MAX
b
5.20
b
4.80
b
5.25
b
4.75
V
Quiescent Current
b
20V
s
V
IN
s
b
7.5V
5 mA
s
I
OUT
s
3A
V
IN
e b
7.5V, T
j
e a
25
§
C
V
IN
e b
20V, T
j
e a
25
§
C
T
A
e
25
§
C, C
L
e
4.7
m
F
10 Hz
s
f
s
100 kHz
1.0
3.0
1.0
3.0
mA
Short Circuit Current
4
2
5.5
3.5
4
2
5.5
3.5
A
A
Output Noise Voltage
150
150
m
V
Long Term Stability
5
50
5
50
mV
Thermal Resistance
Junction to Case
2
2
§
C/W
Note 1:
Unless otherwise specified, these specifications apply:
b
55
§
C
s
T
j
s
a
150
§
C for the LM145 and 0
§
C
s
T
j
s
a
125
§
C for the LM345. V
IN
e
7.5V and
I
OUT
e
5 mA. Although power dissipation is internally limited, electrical specifications apply only for power levels up to 25W. For calculations of junction
temperature rise due to power dissipation, use a thermal resistance of 35
§
C/W for the TO-3 with no heat sink. With a heat sink, use 2
§
C/W for junction to case
thermal resistance.
Note 2:
Regulation is measured at constant junction temperature. Changes in output voltage due to heating effects must be taken into account separately. To
ensure constant junction temperature, pulse testing with a low duty cycle is used.
Note 3:
Refer to RETS145K-5V for LM145K-5.0 military specifications.
Connection Diagram
Metal Can Package
TL/H/7785–2
Bottom View
Order Number LM345K-5.0
See NS Package Number K02A
Order Number LM145K-5.0/883 or
SMD
Y
5962-9064501
See NS Package Number K02C
Typical Applications
Fixed Regulator
TL/H/7785–3
2
Required for stability. For value given, capacitor must be solid tantalum.
50
m
F aluminum electrolytic may be substituted. Values given may be in-
creased without limit.
*
Required if regulator is separated from filter capacitor. For value given, ca-
pacitor must be solid tantulum. 50
m
F aluminum electrolytic may be substi-
tuted.
2
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