1MHz 1A Step-Down DC/DC Converter
Typical Characteristics
Efficiency vs. Input Voltage
(V
OUT
= 1.5V)
100
20
16
12
8
AAT1150
(C
O
= 22μF; V
O
= 1.5V; V
IN
= 3.6V; I
O
= 1A)
μ
200
160
120
AAT1150 Loop Gain and Phase
I
O
= 1A
90
Efficiency (%)
Phase
Phase (degrees)
80
40
0
80
70
60
50
2.5
3
3.5
I
O
= 0.4A
Gain (dB)
4
0
-4
-8
-12
-16
-20
10
Gain
4 x 22μF
5 x 22μF
100
3 x 22μF
-40
-80
-120
-160
-200
1000
4
4.5
5
5.5
Input Voltage (V)
Frequency (kHz)
No Load Input Current vs. Temperature
(V
CC
= V
P
)
12
Non-Switching I
Q
vs. Temperature
(FB = 0V; V
P
= V
CC
)
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.2V
V
CC
= 2.7V
-20
-5
10
25
200
190
180
170
160
150
140
130
120
110
100
Input Current (mA)
10
8
6
4
2
0
-20
-5
10
25
40
55
70
85
Operating Current (μA)
V
CC
= 5.5V
V
CC
= 5.0V
V
CC
= 4.2V
V
CC
= 3.6V
V
CC
= 2.7V
V
CC
= 3.6V
40
55
70
85
Temperature (°C)
Temperature (°C)
Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.5V; I
OUT
= 1.2A)
Transient Response
(V
IN
= 3.6V; V
OUT
= 1.5V; I
LOAD
= 0.25 to 1.2A)
V
(LX)
2V/div
V
OUT
50mV/div
I
L
500mA/div
Inductor Current
500mA/div
Time (500ns/div)
Time (20µs/div)
1150.2006.09.1.5
7
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
