PRODUCT DATASHEET
AAT1184
TM
SwitchReg
High Voltage Step-Down Regulator
Current Limit
Over-Current Offset Voltage: VOCP = 100mV
Total trace parasitic resistor and inductor DCR is 30mΩ
ILIMIT = 3A
VOCP
DCR
100mV
30mΩ
IPRESET
=
=
= 3.3A
AAT1184 Losses
All values assume an 85°C ambient temperature and thermal resistance of 50°C/W in the TSOPJW-12 package.
PTOTAL = IOUT2 · RDS(ON)H · D + (tSW · FS · IOUT + IQ) · VIN
1.2A2 · 70mΩ · 5V
PTOTAL
=
+ (5ns · 490kHz · 1.2A + 70µA) · 12V
12V
P
TOTAL = 78mW
T
J(MAX) = TAMB + ΘJA · PLOSS = 85°C + (140°C/W) · 78mW = 96°C
w w w . a n a l o g i c t e c h . c o m
1184.2008.07.1.0
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
