AAT1143
1MHz 400mA Step-Down Converter
Typical Characteristics
Switching Frequency vs. Temperature
(VIN = 3.6V; VO = 1.5V)
Quiescent Current vs. Input Voltage
(VO = 1.8V)
0.20
0.10
35
85°C
30
25°C
0.00
25
20
-0.10
-40°C
15
-0.20
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
-40
-20
0
20
40
60
80
100
Temperature (°C)
Input Voltage (V)
Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V; C1 = 10µF)
P-Channel RDS(ON) vs. Input Voltage
750
1.4
1.2
1.0
0.8
0.6
0.4
0.2
2.0
1.9
1.8
1.7
700
650
600
550
500
450
400
350
300
120°C
100°C
300mA
1.6
1.5
85°C
30mA
25°C
1.4
1.3
1.2
0.0
-0.2
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Time (25µs/div)
Input Voltage (V)
N-Channel RDS(ON) vs. Input Voltage
Load Transient Response
(30mA - 300mA; VIN = 3.6V; VOUT = 1.8V;
C1 = 10µµF; C4 = 100pF; see Figure 1)
750
700
650
600
550
500
450
400
350
300
0.1
0.0
1.4
1.2
120°C
100°C
300mA
-0.1
1.0
0.8
0.6
0.4
-0.2
-0.3
-0.4
-0.5
-0.6
-0.7
30mA
85°C
0.2
0.0
-0.2
25°C
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Time (25µs/div)
Input Voltage (V)
6
1143.2005.09.1.7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
