AAT1171 Datasheet, PDF (9/22 Pages) Advanced Analogic Technologies – 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch

AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Typical Characteristics
P-Channel R_DS(ON) vs. Input Voltage
400
350 TJ = 120°C
300
T_J = 85°C
250
200 T_J = 25°C
150
100
50
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Bypass R_DS(ON) vs. Input Voltage
140
T_J = 120°C T_J = 85°C
120
100
80 _{TJ = 25°C}
60
40
20
0
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input Voltage (V)
Switching Frequency vs. Temperature
(V_IN = 3.6V; V_OUT = 1.8V; R_L = 10)
2.06
2.04
2.02
PWM
2.00
1.98
LL
1.96
1.94
1.92
1.90
-40.0
-20.0
0.0
20.0
40.0
60.0
80.0
Temperature (°C)
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0.2
Output Voltage vs. DAC Voltage
(V_IN = 4.2V; LL Mode)
25°C
-40°C
85°C
0.4
0.6
0.8
1.0
1.2
1.4
DAC Voltage (V)
Heavy Load Switching Waveform
(V_IN = 3.6V; V_OUT = 1.8V; R_L = 3Ω; C_OUT = 4.7µF; L = 2.2µH)
V_OUT
(AC coupled)
20mV/div
I_L
200mA/div
0
V_LX
2V/div
0
Time (200ns/div)
1171.2006.06.1.0
9