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參數(shù)資料
| 型號： | MIC37100-1.5BM |
| 廠商： | MICREL INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1A LOW VOLTAGE U CAP LDO REGULATOR |
| 中文描述： | 1.5 V FIXED POSITIVE LDO REGULATOR, 0.5 V DROPOUT, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 13/15頁 |
| 文件大?。?/td> | 163K |
| 代理商： | MIC37100-1.5BM |
September 2004
13
M9999-091604
MIC37100/37101/37102
Micrel
0
100
200
300
400
500
600
700
800
900
0
0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
C
2
)
4
°
C
5
°
C
5
°
C
6
°
C
7
°
C
8
°
C
1
°
C
T
JA
=
Figure 4. Copper Area vs. Power SO-8
Power Dissipation
Figure 4 shows copper area versus power dissipation with
each trace corresponding to a different temperature rise
above ambient.
From these curves, the minimum area of copper necessary
for the part to operate safely can be determined. The maxi-
mum allowable temperature rise must be calculated to deter-
mine operation along which curve.
T = T
J
(max)
–
T
A
(max)
T
J
(max) = 125
°
C
T
A
(max) = maximum ambient operating temperature
For example, the maximum ambient temperature is 50
°
C, the
T is determined as follows:
T = 125
°
C
–
50
°
C
T = 75
°
C
Using Figure 4, the minimum amount of required copper can
be determined based on the required power dissipation.
Power dissipation in a linear regulator is calculated as fol-
lows:
P
D
= (V
IN
–
V
OUT
) I
OUT
+ V
IN
×
I
GND
If we use a 2.5V output device and a 3.3V input at an output
current of 1A, then our power dissipation is as follows:
P
D
= (3.3V
–
2.5V)
×
1A + 3.3V
×
11mA
P
D
= 800mW + 36mW
P
D
= 836mW
From Figure 4, the minimum amount of copper required to
operate this application at a
T of 75
°
C is 160mm
2
.
Quick Method
Determine the power dissipation requirements for the design
along with the maximum ambient temperature at which the
device will be operated. Refer to Figure 5, which shows safe
operating curves for three different ambient temperatures:
25
°
C, 50
°
C and 85
°
C. From these curves, the minimum
amount of copper can be determined by knowing the maxi-
mum power dissipation required. If the maximum ambient
temperature is 50
°
C and the power dissipation is as above,
836mW, the curve in Figure 5 shows that the required area of
copper is 160mm
2
.
The
θ
JA
of this package is ideally 63
°
C/W, but it will vary
depending upon the availability of copper ground plane to
which it is attached.
0
100
200
300
400
500
600
700
800
900
0
0.25 0.50 0.75 1.00 1.25 1.50
POWER DISSIPATION (W)
C
2
)
T
A
= 85
°
C
50
°
C
25
°
C
TJ = 125
°
C
Figure 5. Copper Area vs. Power-SOIC
Power Dissipation
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| MIC37100-2.5WS | 功能描述:低壓差穩(wěn)壓器 - LDO 1.0A Low Voltage uCap LDO Regulator in SOT223 Pkg(ROHS Compliant) RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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