AAT1155
1MHz 2.5A Step-Down DC/DC Converter
Typical Characteristics
Tantalum Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
16
0.04
0.02
7
6
12
8
L = 1.5µHy
180
135
90
Phase
4
0
-4
-8
-12
300µF gain
100µF 6.3 Ceramic
TDK P/N C3225X5R0J107M
Vishay GRM43SR60J107ME20L
200µF gain
45
0
-45
-90
-135
-180
100000
Loop Crossover Gain and Phase
Phase (Degrees)
Inductor Current
(bottom) (A)
Output Ripple
(top) (mV)
0.00
-0.02
-0.04
-0.06
-0.08
-0.10
-0.12
0
1
2
3
4
5
120µF 6.3V Tantalum
Vishay P/N 594D127X96R3C2T
5
4
3
2
1
0
-1
Gain (dB)
-16
10000
Time (µs)
µ
Frequency (Hz)
Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
16
4
2
7
6
8
12
Loop Crossover Gain and Phase
180
135
90
AC Output Ripple
(top) (mV)
Inductor Current
(bottom) (A)
Phase (Degrees)
0
-2
-4
-6
200µF 6.3V Ceramic
-10 TDK P/N C3325X5R0J107M
Vishay GRM43SR60J107ME20L
-12
0
1
2
3
-8
5
4
3
2
1
0
-1
4
5
Gain (dB)
4
0
-4
-8
-12
Gain
45
0
-45
-90
120µF 6.3V Tantalum
Vishay P/N 594D127X96R3C2T
100000
-135
-180
1000000
Time (µs)
µ
-16
10000
Frequency (Hz)
Output Ripple
(I
OUT
= 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
4
7
6
5
4
3
2
300µF 6.3VCeramic
TDK P/N C3325X5R0J107M
Vishay GRM43SR60J107ME20L
0
1
2
3
4
5
1
0
-1
3.40
3.30
Tantalum Transient Response
(I
OUT
= 0 to 3.0A; V
OUT
= 3.3V; V
IN
= 5.0V)
7
6
5
4
3
2
1
120µF 6.3V Tantalum
Vishay P/N 594D127X96R3C2T
0
100
200
300
400
500
0
-1
AC Output Ripple
(top) (mV)
2
0
-2
-4
-6
-8
Inductor Current
(bottom) (A)
Output Voltage
(top) (mV)
Inductor Current
(bottom) (A)
3.20
3.10
3.00
2.90
2.80
2.70
2.60
-10
-12
Time (µs)
µ
Time (µs)
µ
1155.2005.11.1.6
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
