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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)： | 17/20頁 |
| 文件大?。?/td> | 828K |
| 代理商： | AAT1112IWP-0.6-T1 |
AAT1112
1.5A, 1.4MHz Step-Down Converter
1112.2007.01.1.1
17
Input Capacitor
Input Ripple V
PP
= 50mV
AAT1112 Losses
Total losses can be estimated by calculating the dropout (V
IN
= V
O
) losses where the power MOSFET R
DS(ON)
will be at the maximum value. All values assume an 85°C ambient temperature and a 120°C junction temper-
ature with the TDFN 50°C/W package.
The total losses are also investigated at the nominal lithium-ion battery voltage (3.6V). The simplified version
of the R
DS(ON)
losses assumes that the N-channel and P-channel R
DS(ON)
are equal.
T
J(MAX)
= T
AMB
+
Θ
JA
· P
LOSS
= 85
°
C + (50
°
C/W) · 375mW = 104
°
C
P
TOTAL
= I
O
2
· R
DS(ON)
+ (t
sw
· F
S
· I
O
+ I
Q
) · V
IN
=
1.5A
2
· 152m
Ω
+ (5ns · 1.2MHz · 1.5A + 50
μ
A) · 3.6V = 375mW
T
J(MAX)
= T
AMB
+
Θ
JA
· P
LOSS
= 85
°
C + (50
°
C/W) · 360mW = 103
°
C
P
LOSS
= I
O1
2
· R
DS(ON)H
=
1.5A
2
· 0.16
Ω
= 0.36W
I
O
2
RMS(MAX)
I
P = esr
·
I
RMS
2
= 5m
Ω
·
(0.75A)
2
= 3mW
=
= 0.75Arms
C
IN
=
=
= 7.3μF; use 10μF
1
- ESR
·
4
·
F
S
V
PP
I
O1
+
I
O2
1
- 5m
Ω
·
4
·
1.2MHz
1.5A
50mV
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