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參數(shù)資料
| 型號： | IRU1260CT |
| 廠商： | International Rectifier |
| 英文描述： | DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| 中文描述： | 雙6A和1A低壓差型正，可調(diào)式穩(wěn)壓器 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 76K |
| 代理商： | IRU1260CT |
IRU1260
6
Rev. 2.1
09/19/02
www.irf.com
Layout Consideration
The IRU1260 like all other high speed linear regulators
need to be properly laid out to insure stable operation.
The most important component is the output capacitor,
which needs to be placed close to the output pin and
connected to this pin using a plane connection with a
low inductance path.
IRU1260 in Ultra LDO, Single Output Application
The IRU1260 can also be used in single supply applica-
tions where the difference between input and output is
much lower than the standard 1.5V dropout that is ob-
tainable with standard LDO devices. The schematic in
Figure 7 shows the application of the IRU1260 in a single
supply with the second LDO being disabled.
In this application, the IRU1260 is used on the VGA
card to convert 3.3V supply to 2.7V to power the Intel
740 chip rather than the conventional LDO which due to
its 1.5V minimum dropout spec must use the 5V supply
to achieve the same result. The difference is a substan-
tial decrease in the power dissipation as shown below.
The maximum power dissipation of the Intel 740 chip is
5.8W, which at 2.7V results in:
2.7
a) Using standard LDO, the power dissipated in the de-
vice is:
Using surface mount TO-263 package with 25
8
C/W
junction to air thermal resistance results in:
This is very close to the thermal shutdown of the IC.
b) Using IRU1260, the power dissipated in the device is
drastically reduced by using 3.3V supply instead of
5V.
P
D
= (V
IN
- Vo)
×
Io = (3.3 - 2.7)
×
2.15 = 1.3W
Using surface mount TO-263 package with 25
8
C/W
junction to air thermal resistance results in:
A reduction of 91
8
C in junction temperature.
Io = 5.8
P
D
= (V
IN
- Vo)
×
Io = (5 - 2.7)
×
2.15 = 4.94W
T
J
= P
D
×θ
JA
+ T
A
= 4.94
×
25 + 25 = 148
8
C
T
J
= P
D
×θ
JA
+ T
A
= 1.3
×
25 + 25 = 57
8
C
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| IRU1261CMTR | 功能描述:IC CONV PENTIUM II TO-263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| IRU1261CP | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED 1.5V AND 2.5V REGULATOR |
| IRU1261CPTR | 功能描述:IC CONV PENTIUM II 7-UTHINP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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