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參數(shù)資料
| 型號： | SP78LC00 |
| 英文描述： | Micropower, 100mA CMOS LDO Regulator |
| 中文描述： | 微功耗，100mA的LDO穩(wěn)壓器的CMOS |
| 文件頁數(shù)： | 5/10頁 |
| 文件大小： | 912K |
| 代理商： | SP78LC00 |
5
Rev. 5/19/03
SP78LC00 100mA CMOS LDO Regulator
Copyright 2003 Sipex Corporation
THEORY OF OPERATION: Continued
tion in the package, use the junction-to-ambi-
ent thermal resistance of the device and the
following basic equation:
(T
J(max)
- T
A
)
P
D
=
θ
JA
T
J(max)
is the maximum junction temperature
of the die and is 125
°
C. T
A
is the ambient
operating.
θ
JA
is the junction-to-ambient ther-
mal resistance for the regulator and is layout
dependent.
The actual power dissipation of the regulator
circuit can be determined using one simple
equation:
P
D
= (V
IN
- V
OUT
)*I
OUT
+ V
IN
*I
GND
(V
IN
- V
OUT
) * I
OUT
Substituting P
D(max)
for P
D
and solving for the
operating conditions that are critical to the
application will give the maximum operating
conditions for the regulator circuit. For ex-
ample, if we are operating the SP78LC00-
3.0V at room temperature, with a minimum
footprint layout, we can determine the maxi-
mum input voltage for a set output current.
P
D(max)
= (125
°
C -25
°
C) = 454mW
(220
°
C/W)
To prevent the device from entering thermal
shutdown, maximum power dissipation can
not be exceeded. Using the output voltage of
3.0V and an output current of 100 mA, the
maximum input voltage can be determined.
Ground pin current can be taken from the
electrical spec’s- table (I
=110
μ
A at
I
=100mA). The maximum input voltage is
determined as follows:
454mW = (V
IN
– 3.0V)*100mA + V
IN
*0.11mA
Solving for V
IN
, we get:
V
IN
= (454mW + 300mW)
100.11mA
After calculations, we find that the maximum
input voltage of a 3.0V application at 100mA
of output current in an SOT-23-5 package
is7.53V.
Dual-Supply Operation
When used in dual supply systems where the
regulator load is returned to a negative sup-
ply, the output voltage must be diode clamped
to ground.
Dropout vs. Io ( fixed 3.0V)
0
50
100
150
200
250
300
350
400
0
50
100
Io (mA)
150
200
D
T=125°
T=27°
T=-40°
Dropout vs. Temp (fixed 3.0V)
0
50
100
150
200
250
-50
-20
10
40
70
100
130
Temp (deg)
D
I
OUT
=100mA
I
OUT
=50mA
TYPICAL CHARACTERISTICS
27
°
C, V
IN
= 5.5V, I
O
= 0.1mA, C
IN
= C
OUT
= 1
μ
F unless otherwise specified.
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