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參數(shù)資料
| 型號(hào)： | LM1117F |
| 廠商： | TAEJIN Technology Co., Ltd. |
| 英文描述： | 1A L.D.O. VOLTAGE REGULATOR |
| 中文描述： | 第1A LDO穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/11頁(yè) |
| 文件大小： | 185K |
| 代理商： | LM1117F |
1A L.D.O. VOLTAGE REGULATOR
LM1117S/RS/F
Maximum Output Current Capability
The LM1117 can deliver a continuous current of 1A over the full operating junction temperature range. However, the
current is limited by the restriction of power dissipation which differs from packages. A heat sink may be required
depending on the maximum power dissipation and maximum ambient temperature of application. With respect to th
applied package, the maximum output current of 1A may be still undeliverable due to the restriction of the power diss
of LM1117. Under all possible conditions, the junction temperature must be within the range specified under
operating conditions. The temperatures over the device are given by:
T
C
= T
A
+ P
D
X
θ
CA
T
J
= T
C
+ P
D
X
θ
JC
T
J
= T
A
+ P
D
X
θ
JA
T
J
is the junction temperature, T
C
is the case temperature, T
A
is the ambient temperature, P
D
is the total power dissi
of the device,
θ
CA is the thermal resistance of case-to-ambient,
θ
JC is the thermal resistance of junction-to-case,
and θJA is the thermal resistance of junction to ambient. The total power dissipation of the device is given by
P
D
= P
IN
– P
OUT
= (V
IN
X I
IN
)–(V
OUT
X I
OUT
)
= (V
IN
X (I
OUT
+I
GND
)) – (V
OUT
X I
OUT
) = (V
IN
- V
OUT
) X I
OUT
+ V
IN
X I
GND
where I
GND
is the operating ground current of the device which is specified at the Electrical Characteristics. The max
allowable temperature rise (TRmax) depends on the maximum ambient temperature (TAmax) of the application
and the maximum allowable junction temperature (TJmax):
T
Rmax
= T
Jmax
– T
Amax
The maximum allowable value for junction-to-ambient thermal resistance,
θ
JA
, can be calculated using the formula:
θ
JA
= T
Rmax
/ P
D
LM1117 is available in SOT223, TO252 packages. The thermal resistance depends on amount of copper area or he
and on air flow. If the maximum allowable value of
θ
JA calculated above is over 130°C/W for SO-223 package, over
for TO252 package, no heat sink is needed since the package can dissipate enough heat to satisfy these
requirements. If the value for allowable θJA falls near or below these limits, a heat sink or proper area of cop
plane is required. In summary, the absolute maximum ratings of thermal resistances are as follow:
Absolute Maximum Ratings of Thermal Resistance
Characteristic
No heat sink / No air flow / No adjacent heat source / 0.066 inch
2
copper area
Jan. 2007 - Rev 1.0
HTC
Max. Rating
130
Unit
°C/W
Thermal Resistance Junction-To-Ambient / TO252
Thermal Resistance Junction-To-Ambient / SOT89
θJA-TO252
θJA-SOT89
93
315
°C/W
°C/W
Thermal Resistance Junction-To-Ambient / SOT223
θJA-SOT223
Symbol
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM1117F-1.2V | 制造商:HTC 制造商全稱(chēng):HTC Korea TAEJIN Technology Co. 功能描述:1A L.D.O VOLTAGE REGULATOR Output Current up to 1 A |
| LM1117F-1.5V | 制造商:HTC 制造商全稱(chēng):HTC Korea TAEJIN Technology Co. 功能描述:1A L.D.O VOLTAGE REGULATOR Output Current up to 1 A |
| LM1117F-1.8V | 制造商:HTC 制造商全稱(chēng):HTC Korea TAEJIN Technology Co. 功能描述:1A L.D.O VOLTAGE REGULATOR Output Current up to 1 A |
| LM1117F-2.5V | 制造商:HTC 制造商全稱(chēng):HTC Korea TAEJIN Technology Co. 功能描述:1A L.D.O VOLTAGE REGULATOR Output Current up to 1 A |
| LM1117F-2.85V | 制造商:HTC 制造商全稱(chēng):HTC Korea TAEJIN Technology Co. 功能描述:1A L.D.O VOLTAGE REGULATOR Output Current up to 1 A |
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