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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(yè)數(shù)： | 28/33頁(yè) |
| 文件大小： | 877K |
| 代理商： | AAT2554 |
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AAT2554
Total Power Solution for Portable Applications
28
2554.2007.01.1.2
Step-Down Converter Design Example
Specifications
V
O
= 1.8V @ 250mA, Pulsed Load
Δ
I
LOAD
= 200mA
V
IN
= 2.7V to 4.2V (3.6V nominal)
F
S
= 1.5MHz
T
AMB
= 85°C
1.8V Output Inductor
(use 3.0μH; see Table 3)
For Sumida inductor CDRH2D09-3R0, 3.0μH, DCR = 150m
Ω
.
1.8V Output Capacitor
V
DROOP
= 0.1V
1
2
3
1
1.8V · (4.2V - 1.8V)
3.0μH · 1.5MHz · 4.2V
2
3
RMS
I
L1 · F
S
· V
IN(MAX)
= ·
·
3 ·
Δ
I
LOAD
V
DROOP
· F
S
3 · 0.2A
0.1V · 1.5MHz
C
OUT
=
=
= 4μF (use 4.7μF)
· = 66mArms
·
(V
O
) · (V
IN(MAX)
- V
O
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (66mA)
2
= 21.8μW
V
V
1.8
V
1.8V
Δ
I
L1
=
1 - =
1 - = 228mA
L1
F
S
V
IN
3.0μH
1.5MHz
4.2V
I
PKL1
= I
O
+
Δ
I
L1
= 250mA + 114mA = 364mA
2
P
L1
= I
O
2
DCR = 250mA
2
150m
Ω
= 9.375mW
L1 = 1.67 A
V
O2
= 1.67 A
1.8V = 3μH
μsec
μsec
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| AAT2554IRN-CAP-T1 | Total Power Solution for Portable Applications |
| AAT2554IRN-CAQ-T1 | Total Power Solution for Portable Applications |
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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 |
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