- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄381232 > AAT2554 (Advanced Analog Technology,lnc.) Total Power Solution for Portable Applications PDF資料下載
參數(shù)資料
| 型號(hào)： | AAT2554 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Total Power Solution for Portable Applications |
| 中文描述： | 總功率便攜式應(yīng)用解決方案 |
| 文件頁數(shù)： | 25/33頁 |
| 文件大?。?/td> | 877K |
| 代理商： | AAT2554 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁當(dāng)前第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
AAT2554
Total Power Solution for Portable Applications
2554.2007.01.1.2
25
For most designs, the step-down converter operates
with inductor values from 1μH to 4.7μH. Table 3 dis-
plays inductor values for the AAT2554 for various
output voltages.
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 3.0μH CDRH2D09 series inductor selected
from Sumida has a 150m
Ω
DCR and a 470mA DC
current rating. At full load, the inductor DC loss is
9.375mW which gives a 2.08% loss in efficiency for
a 250mA, 1.8V output.
Table 3: Step-Down Converter
Inductor Values.
Adjustable Output Resistor Selection
Resistors R2 and R3 of Figure 5 program the out-
put to regulate at a voltage higher than 0.6V. To
limit the bias current required for the external feed-
back resistor string while maintaining good noise
immunity, the suggested value for R3 is 59k
Ω
.
Decreased resistor values are necessary to main-
tain noise immunity on the FB pin, resulting in
increased quiescent current. Table 4 summarizes
the resistor values for various output voltages.
With enhanced transient response for extreme
pulsed load application, an external feed-forward
capacitor (C8 in Figure 5) can be added.
Table 4: Adjustable Resistor Values For
Step-Down Converter.
R3 = 59k
Ω
R2 (k
Ω
)
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R3 = 221k
Ω
R2 (k
Ω
)
75
113
150
187
221
261
301
332
442
464
523
715
1000
V
OUT
(V)
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
R2 = V
·
R3 = 0.6V
·
59k
Ω
= 267k
Ω
REF
V
OUT
3.3V
Output Voltage (V)
L1 (μH)
1.0
1.2
1.5
1.8
2.5
3.0
3.3
1.5
2.2
2.7
3.0/3.3
3.9/4.2
4.7
5.6
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT2554IRN-CAP-T1 | Total Power Solution for Portable Applications |
| AAT2554IRN-CAQ-T1 | Total Power Solution for Portable Applications |
| AAT2554IRN-CAT-T1 | Total Power Solution for Portable Applications |
| AAT2554IRN-CAW-T1 | Total Power Solution for Portable Applications |
| AAT2556 | Battery Charger and Step-Down Converter for Portable Applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT2554IRN-CAP-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAQ-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAT-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2554IRN-CAW-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:Total Power Solution for Portable Applications |
| AAT2556 | 制造商:AAT 制造商全稱:AAT 功能描述:Battery Charger and Step-Down Converter for Portable Applications |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。