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參數(shù)資料
| 型號(hào)： | AAT2158IVN-0.6-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 1.5A Low Noise Step-Down Converter |
| 中文描述： | 1.5A的低噪聲降壓轉(zhuǎn)換器 |
| 文件頁數(shù)： | 15/18頁 |
| 文件大?。?/td> | 684K |
| 代理商： | AAT2158IVN-0.6-T1 |
AAT2158
1.5A Low Noise Step-Down Converter
2158.2007.10.1.1
15
Output Capacitor
V
DROOP
= 0.2V
Input Capacitor
Input Ripple V
PP
= 50mV
AAT2158 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 QFN 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) · 328mW = 101
°
C
P
TOTAL
= I
O
2
· R
DS(ON)
+ [(t
sw
· F
S
· I
O
+ I
Q
) · V
IN
]
=
1.4A
2
· 152m
Ω
+ [(5ns · 1.2MHz · 1.4A + 50
μ
A) · 3.6V] = 328mW
T
J(MAX)
= T
AMB
+
Θ
JA
· P
LOSS
= 85
°
C + (50
°
C/W) · 310mW = 101
°
C
P
LOSS
= I
O1
2
· R
DS(ON)H
=
1.4A
2
· 0.16
Ω
= 0.31W
I
O
2
RMS(MAX)
I
P = esr
·
I
RMS
2
= 5m
Ω
·
(0.7A)
2
= 2.45mW
=
= 0.7Arms
C
IN
=
=
= 6.8μF; use 10μF
1
- ESR
·
4
·
F
S
V
PP
I
O1
+
I
O2
1
- 5m
Ω
·
4
·
1.2MHz
1.4A
50mV
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 · 1.4A
0.2V · 1.2MHz
C
OUT
=
=
= 17.5μF; use 22μF
· = 52mArms
·
(V
OUT
) · (V
IN(MAX)
- V
OUT
)
=
P
esr
= esr · I
RMS2
= 5m
Ω
· (52mA)
2
= 13.3μW
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