AAT3183
300mA Inductorless Step-Down Converter
Typical Characteristics
Output Voltage Ripple vs. Input Voltage
(C
IN
/C
FLY
= 1µF; C
OUT
= 4.7µF; I
OUT
= 300mA)
Output Impedance vs. Input Voltage
1.8
Output Voltage Ripple (mVpp)
100
80
70
60
50
40
30
20
10
0
3
3.6
4.2
4.8
5.4
6
No Post Filter
Output Impedance (Ω)
Ω
90
25°C
1.5
85°C
1.2
100pF Post Filter
0.9
-40°C
2.9
3.1
3.3
3.5
3.7
3.9
4.1
0.6
2.7
Input Voltage (V)
Input Voltage (V)
Load Transient Response
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 5mA to 150mA)
1.54
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
-0.1
1.51
Line Transient
(V
IN
= 3.6V to 4.2V)
6.9
6.4
5.9
5.4
4.9
4.4
3.9
3.4
2.9
Output Current (bottom) (A)
Input Voltage (bottom) (V)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.52
1.5
1.48
1.46
1.44
1.42
1.4
1.38
1.505
1.5
1.495
1.49
1.485
1.48
1.475
1.47
Time (50µs/div)
Time (500µs/div)
Output Ripple
(V
OUT
= 1.5V; I
OUT
= 300mA)
1.54
1.53
1.54
1.53
Output Ripple
(V
OUT
= 1.5V; I
OUT
= 150mA)
Output Ripple (V)
1.52
1.51
1.5
1.49
1.48
1.47
1.46
Output Ripple (V)
1.52
1.51
1.5
1.49
1.48
1.47
1.46
Time (500ns/div)
Time (500ns/div)
6
3183.2007.07.1.2
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
