PRODUCT DATASHEET
AAT2784
SystemPowerTM
3-Channel Step-Down DC/DC Converter
AAT2784 Losses
Total loss can be estimated by calculating the dropout (VIN = VO) losses where the power MOSFETs RDS (ON) will be at the
maximum value. All values assume an 85ºC ambient temperature and a 120ºC junction temperature with the TDFN
50°C/W package.
PLOSS = IO32 · RDS(ON)H1 +2 · (IO12 · RDS(ON)H2,3) = 1.5A2 · 120mΩ +2 · (0.3A2 · 400mΩ) = 0.342W
TJ(MAX) = TAMB + θJA*PLOSS = 85ºC + 50°C*0.324W = 101°C.
Max DC
Current
(A)
Part
Number
Inductance
DCR
(Ω)
Size (mm)
LxWxH
Manufacturer
(μH)
Type
Sumida
Sumida
Sumida
CDRH2D11
CDRH2D11
CDRH2D11
CDRH2D11
CBC2518T
CBC2518T
CBC2518T
CBC2016T
1.5
2.2
3.3
4.7
1.0
2.2
4.7
2.2
1.48
1.27
1.02
0.88
1.2
1.1
0.92
0.83
0.068
0.098
0.123
0.170
0.08
0.13
0.2
3.2x3.2x1.2
3.2x3.2x1.2
3.2x3.2x1.2
3.2x3.2x1.2
2.5x1.8x1.8
2.5x1.8x1.8
2.5x1.8x1.8
2.0x1.6x1.6
Shielded
Shielded
Shielded
Sumida
Shielded
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Taiyo Yuden
Wire Wound Chip
Wire Wound Chip
Wire Wound Chip
Wire Wound Chip
0.2
Table 3: Typical Surface Mount Inductors.
w w w . a n a l o g i c t e c h . c o m
2784.2007.11.1.1
19
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