AAT1145IDE-0.6-T1 View Datasheet(PDF) - Advanced Analogic Technologies
Part Name
Description
MFG CO.
'AAT1145IDE-0.6-T1' PDF : 16 Pages View PDF
SwitchRegTM
Input Capacitor
Input ripple VPP = 50mV
1
1
CIN(MIN) = ⎛ VPP
⎝ IO
- ESR⎞⎠ · 4 · fS
=
= 8.9µF; use 10µF
⎛
⎝
0.05
1.5
-
0.01⎞⎠
· 4 · 1.2 · 106
IRMS =
IO
2
= 1.5 = 750mArms
2
PCIN = ESR · IRMS2 = 0.01 · 0.752 = 5.6mW
PRODUCT DATASHEET
AAT1145
1.5A Step-Down Converter
AAT1145 Losses
PTOTAL = IO2 · RDS(ON)P · D + IO2 · RDS(ON)N · (1 - D) + (tSW · fS · IO) · VIN
1.8
= 1.52 · 0.135 ·
4.2
+ 1.52 · 0.095 · ⎛⎝1 -
1.8⎞
4.2⎠
+
(5
·
10-9
·
1.2
·
106
·
1.5)
·
4.2
=
290mW
16
www.analogictech.com
1145.2008.01.1.2
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