850kHz 1A Synchronous Buck DC/DC Converter
Typical Characteristics
Output Voltage vs. Temperature
I
OUT
=900mA, V
OUT
=1.5V
Output Voltage Error (%)
1.0
0.6
0.2
-0.2
-0.6
-1.0
-20
AAT1152
Line Regulation
V
OUT
=1.5V
0.25
0.15
V
IN
= 2.7V
Accuracy (%)
I
OUT
= 1.0A
0.05
-0.05
-0.15
-0.25
V
IN
= 3.6V
I
OUT
= 0.4A
0
20
40
60
80
100
2.5
3
3.5
4
4.5
5
5.5
Temperature (°C)
Input Voltage (V)
Load Regulation
V
OUT
= 1.5V, V
IN
=3.6V
0
-1
0
-1
Load Regulation
V
OUT
=3.3V, V
IN
=5.0V
V
OUT
Error (%)
Error (%)
-2
-3
-4
-2
-3
-4
-5
-5
0
150
300
450
600
750
900
0
150
300
450
600
750
900
1050
I
OUT
(mA)
Output Current (A)
Efficiency vs. Input Voltage
V
OUT
=1.5V
100
Loop Gain and Phase vs. Output Capacitor
V
IN
= 3.6V I
OUT
= 0.3A
40
225
180
135
32
24
16
I
O
= 1A
90
Efficiency (%)
Gain (dB)
80
70
60
50
2.5
3
3.5
I
O
= 0.4A
100µF
Phase
47µF
69µF
Phase (degrees)
90
45
0
-45
-90
-135
-180
-225
1000
8
0
-8
-16
47µF
-24
-32
-40
4
4.5
5
5.5
Gain
69µF
100µF
10
100
Input Voltage (V)
Frequency (kHz)
6
1152.2003.01.0.9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
