AAT1143IJS-1.2-T1 AnalogicTech, AAT1143IJS-1.2-T1 Datasheet - Page 16
AAT1143IJS-1.2-T1
Manufacturer Part Number
AAT1143IJS-1.2-T1
Description
1MHz 400mA Step-Down Converter
Manufacturer
AnalogicTech
Datasheet
1.AAT1143IJS-1.2-T1.pdf
(20 pages)
- Current page: 16 of 20
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Input Capacitor
Input Ripple V
AAT1143 Losses
C
I
P = esr · I
P
T
16
RMS
J(MAX)
TOTAL
IN
=
=
⎛
⎝
=
+ (t
=
+ (5ns · 1.0MHz · 0.4A + 50µA) · 4.2V = 122mW
= T
I
2
O
V
I
I
0.4
O
PP
O
= 0.2Arms
RMS
sw
AMB
2
· (R
· F · I
2
- ESR · 4 · F
2
· (0.725 Ω · 1.8V + 0.7Ω · [4.2V - 1.8V])
+ Θ
PP
= 5mΩ · (0.2A)
DSON(HS)
= 25mV
1
JA
O
⎞
⎠
+ I
· P
Q
LOSS
) · V
· V
S
O
= 85°C + (160°C/W) · 122mW = 104.5°C
IN
+ R
V
=
IN
2
4.2V
⎛
⎝
= 0.2mW
DSON(LS)
25mV
0.4A
· [V
- 5mΩ · 4 · 1MHz
IN
-V
1
⎞
⎠
O
] )
1MHz 400mA Step-Down Converter
= 4.75µF
AAT1143
1143.2005.09.1.7
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