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參數(shù)資料
| 型號： | AAT2500M |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 400mA Step-Down Converter and 300mA LDO |
| 中文描述： | 400mA的降壓轉(zhuǎn)換器和300mA的LDO |
| 文件頁數(shù)： | 13/22頁 |
| 文件大?。?/td> | 547K |
| 代理商： | AAT2500M |
AAT2500M
400mA Step-Down Converter and 300mA LDO
2500M.2007.06.1.0
13
Equivalent Series Resistance:
ESR is a very
important characteristic to consider when selecting a
capacitor. ESR is the internal series resistance asso-
ciated with a capacitor that includes lead resistance,
internal connections, size and area, material compo-
sition, and ambient temperature. Typically, capacitor
ESR is measured in milliohms for ceramic capacitors
and can range to more than several ohms for tanta-
lum or aluminum electrolytic capacitors.
Step-Down Converter
Inductor Selection:
The step-down converter
uses peak current mode control with slope com-
pensation to maintain stability for duty cycles
greater than 50%. The output inductor value must
be selected so the inductor current down slope
meets the internal slope compensation require-
ments. The internal slope compensation for the
adjustable and low-voltage fixed versions of the
AAT2500M is 0.24A/μsec. This equates to a slope
compensation that is 35% of the inductor current
down slope for a 1.5V output and 2.2μH inductor.
This is the internal slope compensation for the
adjustable (V
O
= 0.6V) version or low output volt-
age fixed versions. When externally programming
the 0.6V version to 2.5V, the calculated inductance
is 3.75μH.
In this case, a standard 4.7μH value is selected.
For high output voltage fixed versions (2.5V and
above), m = 0.48A/μsec. Table 1 displays inductor
values for the AAT2500M fixed and adjustable
options.
Manufacturer's specifications list both the inductor
DC current rating, which is a thermal limitation, and
the peak current rating, which is determined by the
saturation characteristics. The inductor should not
show any appreciable saturation under normal load
conditions. Some inductors may meet the peak and
average current ratings yet result in excessive loss-
es due to a high DCR. Always consider the losses
associated with the DCR and its effect on the total
converter efficiency when selecting an inductor.
The 2.2μH CDRH3D16 series inductor selected
from Sumida has a 59m
DCR and a 1.3A DC cur-
rent rating. At full load, the inductor DC loss is
9.4mW which gives a 1.5% loss in efficiency for a
400mA, 1.5V output.
0.35
V
L = m
≈
1.5 A
V
O
0.24A
= 1.5 A
2.5V = 3.75μH
0.35
V
O
μsec
μsec
A
μsec
0.35
V
m = L
0.35
1.5V
2.2μH
A
μsec
Table 1: Inductor Values.
Configuration
Output Voltage
0.6V to 2.0V
2.5V
0.6V to 2.0V
2.5V to 3.3V
Inductor
2.2μH
4.7μH
2.2μH
2.2μH
Slope Compensation
0.24A/μsec
0.24A/μsec
0.24A/μsec
0.48A/μsec
0.6V Adjustable With
External Resistive Divider
Fixed Output
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT2500MITP-AW-T1 | 400mA Step-Down Converter and 300mA LDO |
| AAT2500 | 1MHz Step-Down Converter/LDO Regulator |
| AAT2500IFP-AQ-T1 | 1MHz Step-Down Converter/LDO Regulator |
| AAT2500IWP-AG-T1 | 1MHz Step-Down Converter/LDO Regulator |
| AAT2500IWP-AI-T1 | 1MHz Step-Down Converter/LDO Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2500MITP-AW-T1 | 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 400mA Step-Down Convrt + 300mA LDO RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| AAT2503 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Adjustable 3-Channel Regulator |
| AAT2503_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Adjustable 3-Channel Regulator |
| AAT2503IZL-BAA-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Adjustable 3-Channel Regulator |
| AAT2504 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Adjustable 3-Channel Regulator |
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