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参数资料
| 型号： | IRU1260CPTR |
| 厂商： | International Rectifier |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC CONV PENTIUM P55C 7-UTHINPAK |
| 标准包装： | 2,000 |
| 应用： | 转换器，Intel Pentium?，P55C |
| 输入电压： | 3 V ~ 7 V |
| 输出数： | 2 |
| 输出电压： | 1.2 V ~ 5.5 V |
| 工作温度： | 0°C ~ 150°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 7-超薄封装 |
| 供应商设备封装： | 7-Ultra Thin-Pak? |
| 包装： | 带卷 (TR) |
| 其它名称： | IRU1260-CPTR IRU1260-CPTR-ND |
IRU1260
Layout Consideration
The IRU1260 like all other high speed linear regulators
The maximum power dissipation of the Intel 740 chip is
5.8W, which at 2.7V results in:
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
Io =
5.8
2.7
= 2.15A
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
a) Using standard LDO, the power dissipated in the de-
vice is:
P D = (V IN - Vo) 3 Io = (5 - 2.7) 3 2.15 = 4.94W
Using surface mount TO-263 package with 25 8 C/W
junction to air thermal resistance results in:
T J = P D 3u JA + T A = 4.94 3 25 + 25 = 148 8 C
This is very close to the thermal shutdown of the IC.
supply with the second LDO being disabled.
b) Using IRU1260, the power dissipated in the device is
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.
drastically reduced by using 3.3V supply instead of
5V.
P D = (V IN - Vo) 3 Io = (3.3 - 2.7) 3 2.15 = 1.3W
Using surface mount TO-263 package with 25 8 C/W
junction to air thermal resistance results in:
T J = P D 3u JA + T A = 1.3 3 25 + 25 = 57 8 C
A reduction of 91 8 C in junction temperature.
6
www.irf.com
Rev. 2.1
09/19/02
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相关代理商/技术参数 |
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|---|---|
| IRU1260CT | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1261 | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED 1.5V AND 2.5V REGULATOR |
| IRU1261CM | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED 1.5V AND 2.5V REGULATOR |
| IRU1261CMTR | 功能描述:IC CONV PENTIUM II TO-263-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,000 系列:- 应用:电源，ICERA E400，E450 输入电压:4.1 V ~ 5.5 V 输出数:10 输出电压:可编程 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:42-WFBGA，WLCSP 供应商设备封装:42-WLP 包装:带卷 (TR) |
| IRU1261CP | 制造商:IRF 制造商全称:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED 1.5V AND 2.5V REGULATOR |
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