參數(shù)資料
型號(hào)： IRU1050
廠商： International Rectifier
英文描述： 5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
中文描述： 第5A低壓差型正，可調(diào)式穩(wěn)壓器
文件頁數(shù)： 6/12頁
文件大?。?/td> 75K
代理商： IRU1050
6
Rev. 1.8
08/20/02
IRU1050
www.irf.com
V
ESR
V
ESL
V
C
T
LOAD
CURRENT
LOAD CURRENT RISE TIME
1050plt1-1.0
Vc = t
C 7500
×
I 2
×
4.6
C
IN
=4.6
μ
F
0.15
×
50
ESR =(V
IN
- V
OUT
-
V - V
DROP
)
I
ESR = (5 - 3.5 - 1.2 - 0.15)
4.6
ESR
≤
37
4.6
Type of V
OUT
I
MAX
Max Allowed
Processor Nominal Output Tolerance
Intel-P54C VRE 3.50 V 4.6 A
±
100 mV
Figure 5 - Typical regulator response
to the fast load current step.
An example of a regulator design to meet the Intel P54C
VRE specification is given below.
Assume the specification for the processor as shown in
Table 1:
Table 1 - Processor Specification
The first step is to select the voltage step allowed in the
output due to the output capacitor’s ESR:
1) Assuming the regulator’s initial accuracy plus the re-
sistor divider tolerance is
≈ ±
53mV (
±
1.5% of 3.5V
nominal), then the total step allowed for the ESR and
the ESL is
47mV.
Assuming that the ESL drop is
10mV, the remain-
ing ESR step will be
37mV. Therefore the output
capacitor ESR must be:
The Sanyo MVGX series is a good choice to achieve
both price and performance goals. The 6MV1500GX,
1500
μ
F, 6.3V has an ESR of less than 36m
typi-
cal. Selecting 5 of these capacitors in parallel has an
ESR of
≈
7.2m
which achieves our design goal.
The next step is to calculate the drop due to the ca-
pacitance discharge and make sure that this drop in
voltage is less than the selected ESL drop in the
previous step.
R2 = V
R1 = 1.25-1
×
121 = 217.8
REF
-1
)
V
OUT
3.5
2) The output capacitance is 5
×
1500
μ
F = 7500
μ
F
Where:
t = 2
μ
s is the regulator response time
To set the output DC voltage, we need to select R1 and
R2:
3) Assuming R1=121
, 0.1%:
Select R2=218
, 0.1%
Selecting both R1 and R2 resistors to be 0.1% toler-
ance, results in the least amount of error introduced
by the resistor dividers leaving
≈ ±
1.3% error budget
for the IRU1050 reference which is within the initial
accuracy of the device.
Finally, the input capacitor is selected as follows:
4) Assuming that the input voltage can drop 150mV be-
fore the main power supply responds, and that the
main power supply response time is
≈
50
μ
s, then
the minimum input capacitance for a 4.6A load step
is given by:
The ESR should be less than:
Where:
V
DROP
L
Input voltage drop allowed in step 4
V
L
Maximum regulator dropout voltage
I
L
Load current step
Selecting two Sanyo 1500
μ
F, the same type as the
output capacitors, meets our requirements.
相關(guān)PDF資料
PDF描述
IRU1050CM 5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1050CP 5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1050CT 5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1050-33 5A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR
IRU1050CD 5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IRU1050-33 制造商:IRF 制造商全稱:International Rectifier 功能描述:5A LOW DROPOUT POSITIVE FIXED 3.3V REGULATOR
IRU1050-33CD 功能描述:IC REG LDO 3.3V 5A D-PAK 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
IRU1050-33CDTR 功能描述:IC REG LDO 3.3V 5A D-PAK 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
IRU1050-33CM 功能描述:IC REG LDO 3.3V 5A TO-263-3 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
IRU1050-33CMTR 功能描述:IC REG LDO 3.3V 5A TO-263-3 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
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