AAT1155(2004) Ver la hoja de datos (PDF) - Analog Technology Inc
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Fabricante
AAT1155 Datasheet PDF : 16 Pages
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AAT1155
1MHz 2.5A Buck DC/DC Converter
Vin 3.5V-5.5V
C4
100µF
R1 R2
100 100k
C1
10µF
C3
0.1µF
U1
AAT1155-3. 3
FB VP
GND LX
EN LX
VCC VP
Vout 3.3V @ 2.5A
L1
1.5µH
D1
C2
B340LA 120µF
+
-
rtn C1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3
C2 Vishay120µF 6.3V 594D127X96R6R3C2T
C3 0.1µF 0603ZD104M AVX
C4 Vishay Sprague 100µF 16V 595D107X0016C 100µF 16V
D1 B340LA Diodes Inc.
L1 CDRH6D28-1.5µH Sumida
Options
C2 MuRata 100µF 6.3V GRM43-2 X5R 107M 100µF 6.3V (two or three in parallel)
C2 TDK 100µF 6.3V C3325X5R0J107M 100µF 6.3V (two or three in parallel)
Figure 1. 3.3 Volt 3 Amp output
Efficiency
Adjustable Output
For applications requiring an output other than the
fixed outputs available, the 1V version can be pro-
grammed externally. Resistors R3 and R4 of figure 5
force the output to regulate higher than 1 Volt. For
Efficiency vs. Load Current
VIN = 5.0V, VOUT = 3.3V
100
95
90
85
80
75
70
65
60
0.01
0.1
1
10
Output Current (A)
Figure 2. 5 Volt Input 3.3 Volt Output
accurate results (less than 1% error for all outputs)
select R4 to be 10kΩ. Once R4 has been selected
R3 can be calculated. For a 1.25 Volt output with R4
set to 10k R3 is 2.5kΩ.
R3 = (VO - 1) · R4 = 0.25 · 10kΩ = 2.5kΩ
Vin 2.7V-5.5V
C4
100µF
R1 R2
100 100k
R3
2.55k
C1
10µF
C3
0.1µF
R4
10.0k
U1
AAT1155-1.0
FB VP
GND LX
EN LX
VCC VP
VOUT 1.25V @ 2.5A
L1
1.5µH
D1
C2
B340LA 120µF
rtn
C1 Murata 10µF 6.3V X5R GRM42-6X5R106K6.3
C2 Vishay 120µF 6.3V 594D127X96R6R3C2T
C3 0.1µF 0603ZD104M AVX
C4 Vishay Sprague 100µF 16V 595D107X0016C 100µF 16V
D1 B340LA Diodes Inc.
L1 CDRH6D28-1.5µH Sumida
Options
C2 MuRata 100uF 6.3V GRM43-2 X5R 107M 100µF 6.3V (two or three in parallel)
C2 TDK 100µF 6.3V C3325X5R0J107M 100µF 6.3V (two or three in parallel)
Figure 3. AAT1155 Evaluation Board with adjustable output
14
1155.2004.08.1.2
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