1MHz 3A Buck DC/DC Converter
Typical Characteristics
Inrush and Output Overshoot Characteristic
No Load
14
12
6
4
2
AAT1154
Output Ripple
I
OUT
= 3.0A, V
OUT
= 3.3V, V
IN
= 5.0V
7
6
Inductor Current
4
AC Output Ripple
top (mV)
Voltage (V)
(bottom traces)
Inductor Current
bottom (A)
10
8
6
4
2
0
-2
0
0.4
0.8
1.2
1.6
2
2
0
-2
0
-2
-4
-6
-8
-10
-12
0
1
2
3
4
5
5
4
3
2
Current (A)
(top trace)
Input
Output
-4
-6
-8
-10
300 µF 6.3VCeramic
TDK P/N C3325X5R0J107M
1
0
-1
Time (millisec)
Time (µsec)
µ
Output Ripple
I
OUT
= 3.0A, V
OUT
= 3.3V, V
IN
= 5.0V
AC Output Ripple (top)
(mV)
4
2
7
6
Tantalum Output Ripple
I
OUT
= 3.0A, V
OUT
= 3.3V, V
IN
= 5.0V
40
20
0
-20
-40
-60
-80
-100
-120
0
1
2
3
4
5
7
6
Inductor Current
(bottom) (A)
AC Output Ripple
(top) (mV)
Inductor Current
(bottom) (A)
0
-2
-4
-6
-8
-10
-12
0
1
2
3
4
5
5
4
3
2
5
4
3
2
200 uF 6.3V Ceramic
TDK P/N C3325X5R0J107M
1
0
-1
120
µF
6.3V Tantalum Vishay
P/N 594D127X96R3C2T
1
0
-1
Time (µsec)
µ
Time (µsec)
µ
Loop Crossover Gain and Phase
16
12
8
180
135
16
12
Loop Crossover Gain and Phase
120
µF
6.3V Tantalum
Vishay P/N 594D127X96R3C2T
Phase
180
135
Phase (Degrees)
Phase (Degrees)
Phase
90
45
8
90
45
0
Gain (dB)
4
0
-4
-8
-12
Gain (dB)
4
0
-4
-8
-12
-16
10000
3x 100µF
2x 100µF
100µF 6.3V Ceramic
TDK P/N C3225X5R0J107M
0
-45
-90
-135
-180
100000
Gain
-45
-90
-135
-180
100000
-16
10000
Frequency (Hz)
Frequency (Hz)
1154.2003.08.0.91
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
