600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Typical Characteristics
Efficiency vs. Output Current
(LL Mode; V
OUT
= 3.3V)
100
90
1.0
AAT1171
Load Regulation
(LL Mode; V
OUT
= 3.3V)
Output Voltage Error (%)
V
IN
= 3.9V
Efficiency (%)
0.5
80
70
60
50
40
0.1
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.0V
0.0
-0.5
V
IN
= 4.2V
1
10
100
1000
-1.0
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(PWM Mode; V
OUT
= 3.3V)
90
80
Load Regulation
(PWM Mode; V
OUT
= 3.3V)
1.0
Output Voltage Error (%)
100
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
0.5
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 4.2V
V
IN
= 5.0V
0.0
V
IN
= 3.6V
-0.5
V
IN
= 4.2V
1
10
100
1000
100
1000
-1.0
0.1
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(LL Mode; V
OUT
= 2.5V)
V
IN
= 3.0V
Output Voltage Error (%)
100
90
1.0
Load Regulation
(LL Mode; V
OUT
= 2.5V)
Efficiency (%)
0.5
80
70
60
50
40
0.1
1
10
V
IN
= 5.0V
V
IN
= 4.2V
V
IN
= 4.2V
V
IN
= 5.0V
0.0
-0.5
V
IN
= 3.0V
100
1000
-1.0
0.1
1
10
100
1000
Output Current (mA)
Output Current (mA)
6
1171.2006.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
