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參數(shù)資料
| 型號(hào)： | IRU1260CM |
| 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(yè)數(shù)： | 4/12頁(yè) |
| 文件大?。?/td> | 76K |
| 代理商： | IRU1260CM |
IRU1260
4
Rev. 2.1
09/19/02
www.irf.com
Introduction
The IRU1260 is a dual adjustable Low Dropout (LDO)
regulator which can easily be programmed with the ad-
dition of two external resistors to any voltages within
the range of 1.20 to 5.5V. This voltage regulator is de-
signed specifically for applications that require two sepa-
rate regulators such as the Intel Pentium
II
TM
proces-
sors requiring 1.5V and 2.5V supplies, eliminating the
need for a second regulator which results in lower over-
all system cost. When V
CTRL
pin is connected to a sup-
ply which is at least 1V higher than V
IN
, the dropout
voltage improves by 30% which makes it ideal for appli-
cations requiring less than the standard 1.3V dropout
given in the LDO products such as IRU10XX series. The
IRU1260 also provides an accurate 1.20V voltage refer-
ence common to both regulators for programming each
output voltage. Other features of the device include: fast
response to sudden load current changes, such as GTL+
termination application for Pentium
II
TM
family of micro-
processors. The IRU1260 also includes thermal shut-
down protection to protect the device if an overload con-
dition occurs.
Output Voltage Setting
The IRU1260 can be programmed to any voltages in the
range of 1.20V to 5.5V with the addition of R1 and R2
external resistors according to the following formula:
(
)
Figure 3 - Typical application of the IRU1260
for programming the output voltage.
(Only one output is shown here)
V
OUT
R2
R1
V
IN
V
CTRL
V
REF
I
B
IRU1260
Gnd
V
OUT
V
CTRL
V
IN
V
FB
R2
R1
V
IN
V
CTRL
R
L
R
P
PARASITIC LINE
RESISTANCE
IRU1260
Gnd
V
OUT
V
CTRL
V
IN
V
FB
Where:
V
REF
= 1.20V Typically
I
B
= 0.02
μ
A Typical
R1 and R2 as shown in Figure 3:
V
OUT
= V
REF
×
+R
2
×
I
B
1+
R
2
R
1
The IRU1260 keeps a constant 1.2V between the V
FB
pin and ground pin. By placing a resistor R1 across these
two pins a constant current flows through R1, adding to
the I
FB
current and into the R2 resistor producing a volt-
age equal to the (1.2/R1)
×
R2 + I
FB
×
R2 which will be
added to the 1.2V to set the output voltage as shown in
the above equation. Since the input bias current of the
amplifier (I
FB
) is only 0.02
μ
A typically, it adds a very
small error to the output voltage and for most applica-
tions can be ignored. For example, in a typical 1.5V
GTL+application if R1=10.2K
and R2=2.55K
the er-
ror due to the I
ADJ
is only 0.05mV which is less than
0.004% of the nominal set point. The effective input im-
pedance seen by the feedback pins (The parallel combi-
nation of R1 and R2) must always be higher than 1.8K
in order for the regulator to start up properly.
Load Regulation
Since the IRU1260 does not provide a separate ground
pin for the reference voltage, it is not possible to provide
true remote sensing of the output voltage at the load.
Figure 4 shows that the best load regulation is achieved
when the bottom side of R1 resistor is connected di-
rectly to the ground pin of IRU1260 (preferably to the tab
of the device) and the top side of R2 resistor is con-
nected to the load. In fact, if R1 is connected to the load
side, the effective resistance between the regulator and
the load is gained up by the factor of (1+R2/R1), or the
effective resistance will be, R
P(eff)
=R
P
×
(1+R2/R1). It is
important to note that for high current applications, this
can represent a significant percentage of the overall load
regulation and one must keep the path from the regula-
tor to the load as short as possible to minimize this
effect.
Figure 4 - Schematic showing connection
for best load regulation.
(Only one output is shown here)
APPLICATION INFORMATION
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| IRU1260CMTR | 功能描述:IC CONV PENTIUM P55C TO-263-7 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(biāo)準(zhǔn)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) |
| IRU1260CP | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1260CPTR | 功能描述:IC CONV PENTIUM P55C 7-UTHINPAK 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(biāo)準(zhǔn)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) |
| IRU1260CT | 制造商:IRF 制造商全稱:International Rectifier 功能描述:DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR |
| IRU1261 | 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 |
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