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參數(shù)資料
| 型號： | AAT1112IWP-0.6-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 1.5A, 1.4MHz Step-Down Converter |
| 中文描述： | 1.5A的，1.4MHz的降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 828K |
| 代理商： | AAT1112IWP-0.6-T1 |
AAT1112
1.5A, 1.4MHz Step-Down Converter
16
1112.2007.01.1.1
Design Example
Specifications
V
O
3.3V @ 1.5A, Pulsed Load
Δ
I
LOAD
= 1.5A
V
IN
2.7V to 4.2V (3.6V nominal)
F
S
1.2MHz
T
AMB
85°C in TDFN33-12 Package
Output Inductor
L1 = V
O
(μH) = 3.3μH; see Table 2.
For Sumida inductor CDRH4D28 3.3μH DCR = 49.2m
Ω
max.
Output Capacitor
V
DROOP
= 0.2V
1
2
3
1
3.3V · (4.2V - 3.3V)
3.3μH · 1.2MHz · 4.2V
2
3
RMS(MAX)
I
L · F
S
· V
IN(MAX)
= ·
·
3 ·
Δ
I
LOAD
V
DROOP
· F
S
3 · 1.5A
0.2V · 1.2MHz
C
OUT
=
=
= 18.8μF; use 22μF
· = 52mArms
·
(V
OUT
) · (V
IN(MAX)
- V
OUT
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (52mA)
2
= 13.3μW
V
V
3.3
V
3.3V
Δ
I
1
=
1 - =
1 - = 179mA
L1
F
S
V
IN
3.3μH
1.2MHz
4.2V
I
PK1
= I
O1
+
Δ
I
1
= 1.5A + 0.089A = 1.59A
2
P
L1
= I
O1
2
DCR = 1.5A
2
49.2m
Ω
= 110mW
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