參數(shù)資料
型號(hào)： IRU1015-33
廠商： International Rectifier
英文描述： GT 17C 17#16 PIN PLUG
中文描述： 1.5A的低壓差型正，固定3.3V穩(wěn)壓器
文件頁數(shù)： 6/8頁
文件大?。?/td> 104K
代理商： IRU1015-33
IRU1015
6
Rev. 1.1
06/29/01
2) With the output capacitance being 1500
μ
F:
Where:
t = 2
μ
s is the regulator response time
To set the output voltage, we need to select R1 and R2:
3) Assuming R1 = 121
, 1%
Select R2 = 215
, 1%
Selecting both R1 and R2 resistors to be 1% toler-
ance results in the least amount of error introduced
by the resistor dividers leaving a
≈
±2.5% error bud-
get for the IRU1015 reference which is well 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
≈
50ms, then
the minimum input capacitance for a 1.2A 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
Select a single 1500
μ
F the same type as the output
capacitors exceeds our requirements.Figure 6 shows
the completed schematic for our example.
Figure 5 - Typical regulator response to the
fast load current step
An example of a regulator design to meet the AMD speci-
fication for 486DX4-120MHz is given below.
Assume the specification for the processor as shown in
Table 1:
Type of Vout Imax Max Allowed
Processor Nominal Output Tolerance
AMD 486DX4 3.45 V 1.2 A
±
150 mV
Table 1 - GTL+ specification for Pentium Pro
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
≈
±86mV (±2.5% of 3.45V
nominal), then the total step allowed for the ESR and
the ESL, is -64mV.
Assuming that the ESL drop is -10mV, the remaining
ESR step will be -54mV. Therefore the output ca-
pacitor ESR must be:
54
1.2
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 a single capacitor 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.
V
ESR
V
ESL
V
C
T
LOAD
CURRENT
LOAD CURRENT RISE TIME
1015plt1-1.0
C
IN
=1.2
μ
F
0.15
×
50
ESR = (5 - 3.45 - 1.2 - 0.15)
1.2
ESR =(
VIN
- V
OUT
-
V - V
DROP
)
I
Vc = t
C 1500
×
I 2
×
1.2
ESR
≤
= 45m
R2 =
o
- 1
p
×
121 =
o
p
×
121 = 213
V
REF
V
- 1
1.25
相關(guān)PDF資料
PDF描述
IRU1015CD 1.5A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR(104.36 k)
IRU1030 3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1030CD 3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1030CM 3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
IRU1030CT 3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
IRU1015-33CD 功能描述:IC REG LDO 3.3V 1.5A 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
IRU1015-33CDTR 功能描述:IC REG LDO 3.3V 1.5A 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（最小）:- 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
IRU1015-33CM 功能描述:IC REG LDO 3.3V 1.5A 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
IRU1015-33CMTR 功能描述:IC REG LDO 3.3V 1.5A 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（最小）:- 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
IRU1015-33CP 功能描述:IC REG LDO 3.3V 1.5A 2-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
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