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參數(shù)資料
| 型號： | MIC5212-SJBM |
| 廠商： | MICREL INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual 500mA LDO Regulator |
| 中文描述： | DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 8/9頁 |
| 文件大?。?/td> | 171K |
| 代理商： | MIC5212-SJBM |
MIC5212
Micrel
MIC5212
8
April 2003
Low dropout linear regulators from Micrel are rated to a
maximum junction temperature of 125
°
C. It is important not
to exceed this maximum junction temperature during opera-
tion of the device. To prevent this maximum junction tempera-
ture from being exceeded, the appropriate ground plane heat
sink must be used.
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
Figure 2. Copper Area vs. Power-SO
Power Dissipation
(
T
JA
)
Figure 2 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 2, 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
IN1
–
V
OUT1
)
×
I
OUT1
+ V
IN1
×
I
GND1
+ (V
IN2
–
V
OUT2
)
×
I
OUT2
+ V
IN2
×
I
GND2
With a common 5V input, a 3.3V, 300mA output on LDO 1 and
a 2.5V, 150mA output on LDO 2, power dissipation is as
follows:
P
D
= (5V
–
3.3V)
×
300mA + 5V
×
5mA
+ (5V
–
2.5V)
×
150mA + 5V
×
1.8mA
P
D
= 0.919W
From Figure 2, the minimum amount of copper required to
operate this application at a
T of 75
°
C is 500mm
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 3, 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,
920mW, the curve in Figure 3 shows that the required area of
copper is 500mm
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
)
85
°
C
50
°
C
25
°
C
TJ = 125
°
C
Figure 3. Copper Area vs. Power-SO
Power Dissipation (T
A
)
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| MIC5212-SJBM TR | 功能描述:IC REG LDO 3.3V/2.5V .5A 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-205AD，TO-39-3 金屬罐 供應(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5212-SJYM | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA 1% Low Noise LDO(Lead Free) 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5212-SJYM TR | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA 1% Low Noise LDO(Lead Free) 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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