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參數(shù)資料
| 型號(hào)： | FAN1581M12X |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| 中文描述： | 1.2 V FIXED POSITIVE LDO REGULATOR, 0.6 V DROPOUT, PSSO5 |
| 封裝： | PLASTIC, TO-263, 5 PIN |
| 文件頁數(shù)： | 7/13頁 |
| 文件大小： | 85K |
| 代理商： | FAN1581M12X |
PRODUCT SPECIFICATION
FAN1581
REV. 1.2.0 11/6/03
7
The current out of the adjust pin adds to the current from R1
and is typically 50μA. Its output voltage contribution is
small and only needs consideration when a very precise out-
put voltage setting is required.
Figure 2. Basic Regulator Circuit
Load Regulation
The FAN1581 family provides true remote sensing, eliminat-
ing output voltage errors due to trace resistance. To utilize
remote sensing, connect the VSENSE pin directly to the
load, rather than at the VOUT pin. If the load is more than 1"
away from the FAN1581, it may be necessary to increase the
load capacitance to ensure stability.
Thermal Considerations
The FAN1581 series protect themselves under overload con-
ditions with internal power and thermal limiting circuitry.
However, for normal continuous load conditions, do not exceed
maximum junction temperature ratings. It is important to
consider all sources of thermal resistance from junction-to-
ambient. These sources include the junction-to-case resistance,
the case-to-heat sink interface resistance, and the heat sink
resistance. Thermal resistance specifications have been
developed to more accurately reflect device temperature and
ensure safe operating temperatures. The electrical character-
istics section provides a separate thermal resistance and
maximum junction temperature for both the control circuitry
and the power transistor. Calculate the maximum junction
temperature for both sections to ensure that both thermal
limits are met.
For example, look at using an FAN1581M-1.5 to generate
5A @ 1.5V ± 2% from a 3.3V source (3.2V to 3.6V).
Assumptions:
V
in
= 3.6V worst case
V
OUT
= 1.47V worst case
I
OUT
= 5A continuous
T
A
= 40°C
Θ
Case-to-Ambient
= 5°C/W (assuming both a heatsink and a
thermally conductive material)
The power dissipation in this application is:
P
D
= (V
IN
- V
OUT
) * (I
OUT
) = (3.6-1.47) * (5) = 10.65W
From the specification table,
T
J
= T
A
+ (P
D
) * (
Θ
Case-to-Ambient +
Θ
JC
)
= 40 + (10.65) * (5 + 3) = 125°C
The junction temperature is within the maximum rating.
Junction-to-case thermal resistance is specified from the IC
junction to the bottom of the case directly below the die. This
is the lowest resistance path for heat flow. Proper mounting
ensures the best thermal flow from this area of the package to
the heat sink. Use of a thermally conductive material at the
case-to-heat sink interface is recommended. Use a thermally
conductive spacer if the case of the device must be electri-
cally isolated and include its contribution to the total thermal
resistance.
C2
22
μ
F
V
IN
V
OUT
V
REF
C1
10
μ
F
V
cntl
+
+
Vcntl
Vsense
Vin
Adj
Vout
FAN1581
R1
R2
I
ADJ
50
μ
A
V
OUT
= V
REF
(1+R2/R1) + I
ADJ
(R2)
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| FAN1581M25X | 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| FAN1581MX | 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| FAN1581T | 5A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| FAN1582D-1.5 | 3A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
| FAN1582D-2.5 | 3A Adjustable/Fixed Ultra Low Dropout Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| FAN1581M15X | 功能描述:低壓差穩(wěn)壓器 - LDO 5A Adj LDO Vltg Reg 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(dòng)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 |
| FAN1581M-2.5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
| FAN1581M25X | 功能描述:低壓差穩(wěn)壓器 - LDO 5A Adj LDO Vltg Reg 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(dòng)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 |
| FAN1581MX | 功能描述:低壓差穩(wěn)壓器 - LDO 5A Adj LDO Vltg Reg 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(dòng)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 |
| FAN1581P | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Adjustable Voltage Regulator |
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