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參數(shù)資料
| 型號： | IRU1176CM |
| 廠商： | International Rectifier |
| 英文描述： | IC DC/DC CONVERTER 2CH SO-16 |
| 中文描述： | 7.5A的超低壓差型正面的關(guān)斷輸入可調(diào)調(diào)壓器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 46K |
| 代理商： | IRU1176CM |
4
Rev. 1.4
03/18/02
IRU1176
www.irf.com
APPLICATION INFORMATION
Introduction
The IRU1176 adjustable regulator is a five-terminal de-
vice designed specifically to provide extremely low drop-
out voltages comparable to the PNP type without the
disadvantage of the extra power dissipation due to the
base current associated with PNP regulators. This is
done by bringing out the control pin of the regulator that
provides the base current to the power NPN and con-
necting it to a voltage that is grater than the voltage present
at the V
IN
pin. This flexibility makes the IRU1176 ideal
for applications where dual inputs are available such as
a computer mother board with an ATX style power sup-
ply that provides 5V and 3.3V to the board. One such
application is the new graphic chip sets that require any-
where from 2.4V to 2.7V supply such as the Intel
I
740
chip set. The IRU1176 can easily be programmed with
the addition of two external resistors to any voltages
within the range of 1.25 to 5.5V. Another major require-
ment of these graphic chips is the need to switch the
load current from zero to several amps in tens of nano-
seconds at the processor pins, which translates to an
approximately 300 to 500ns of current step at the regu-
lator. In addition, the output voltage tolerances are also
extremely tight and they include the transient response
as part of the specification.
The IRU1176 is specifically designed to meet the fast
current transient needs as well as providing an accurate
initial voltage, reducing the overall system cost with the
need for fewer number of output capacitors. Another fea-
ture of the device is its true remote sensing capability
which allows accurate voltage setting at the load rather
than at the device.
Output Voltage Setting
The IRU1176 can be programmed to any voltages in the
range of 1.25V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
Figure 3 - Typical application of the IRU1176 for
programming the output voltage.
BLOCK DIAGRAM
Figure 2 - Simplified block diagram of the IRU1176.
Where:
V
REF
= 1.25V Typically
I
ADJ
= 50
μ
A Typically
R
1
& R
2
as shown in Figure 3:
V
OUT
= V
REF
×
o
1 +
p
+ I
ADJ
×
R
2
R
2
R
1
V
CTRL
V
IN
V
SENSE
Adj
V
OUT
OUTPUT
SHUTDOWN
CURRENT
LIMIT
1.25V
THERMAL
SHUTDOWN
SD
+
+
6,7
5
2
3
1
4
V
OUT
R1
R2
V
IN
V
CTRL
V
REF
I
ADJ
= 50uA
IRU1176
V
SENSE
Adj
SD
V
OUT
V
CTRL
V
IN
Open
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRU1176CMTR | 功能描述:IC REG LDO ADJ 7.5A TO-263-7 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| IRU1176CP | 制造商:IRF 制造商全稱:International Rectifier 功能描述:7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT |
| IRU1176CPTR | 功能描述:IC REG LDO ADJ 7.5A 7-UTHINPAK RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱:LP2985AIBP-4.0DKR |
| IRU1205 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:300mA ULTRA LOW DROPOUT POSITIVE ADJUSTABLE AND FIXED REGULATORS |
| IRU1205-18 | 制造商:IRF 制造商全稱:International Rectifier 功能描述:300mA ULTRA LOW DROPOUT POSITIVE ADJUSTABLE AND FIXED REGULATORS |
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