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參數(shù)資料
| 型號： | IRU1175 |
| 廠商： | International Rectifier |
| 英文描述： | 7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| 中文描述： | 7.5A的超低壓差型正，可調(diào)式穩(wěn)壓器 |
| 文件頁數(shù)： | 4/6頁 |
| 文件大?。?/td> | 50K |
| 代理商： | IRU1175 |
2-82
Rev. 1.2
11/29/99
IRU1175
APPLICATION INFORMATION
Introduction
The IRU1175 adjustable regulator is a five-terminal de-
vice designed specificaly 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 bringinging 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 Vin pin.This flexibility makes the IRU1175 ideal
for applications where dual inputs are available such as
a computer motherboard with an ATX style power sup-
ply that provides 5V and 3.3V to the board. One such
application is the new graphic chipsets that require any-
where from 2.4V to 2.7V supply such as the Intel I740
chipset. The IRU1175 can easily be programmed with
the addition of two external resistors to any voltages
within the range of 1.25 to 5.5 V. 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 IRU1175 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 IRU1175 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 2 - Typical application of the IRU1175 for
programming the output voltage
BLOCK DIAGRAM
V
V
R
R
I
R
OUT
REF
ADJ
=
+
+
×
1
2
1
2
Figure 1 - Simplified block diagram of the IRU1175
Where: V
REF
=1.25V Typically
I
ADJ
=50
μ
A Typically
R
1
& R
2
as shown in Figure 2
1504
Vctrl
Vin
Vsense
1175blk1-1.0
Adj
Vout
THERMAL
SHUTDOWN
CURRENT
LIMIT
1.25V
+
+
Vout
1175app2-1.0
R1
R2
Vin
Vctrl
Vref
IAdj = 50uA
IRU1175
Vsense
Adj
Vout
Vctrl
Vin
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| IRU1175CM | 7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
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| IRU1175CS | 7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1176 | 7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR WITH SHUTDOWN INPUT |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| IRU1175CM | 制造商:IRF 制造商全稱:International Rectifier 功能描述:7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1175CMTR | 功能描述:IC REG LDO ADJ 7.5A TO-263-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:1 系列:- 穩(wěn)壓器拓撲結(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標準）: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 |
| IRU1175CP | 制造商:IRF 制造商全稱:International Rectifier 功能描述:7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1175CS | 制造商:IRF 制造商全稱:International Rectifier 功能描述:7.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1176 | 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 |
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