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| AAT1171 Datasheet, PDF (11/22 Pages) Advanced Analogic Technologies – 600mA Voltage-Scaling Step-Down Converter for RF Power Amplifiers with Bypass Switch | |||
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AAT1171
600mA Voltage-Scaling Step-Down Converter
for RF Power Amplifiers with Bypass Switch
Typical Characteristics
DAC to Bypass Transient Response
(LL Mode; VIN = 4.2V; RL = 10Ω; COUT = 4.7µF; L = 2.2µH)
4.2V
VOUT
1V/div
0
VDAC
0.5V/div
0
0.6V
1.3V
0.2V
Time (25µs/div)
VOUT
1V/div
0
Enable
2V/div
0
IIN
200mA/div
0
Enable Soft Start
(VIN = 3.6V; VOUT = 1.8V; RL = 4.5Ω;
COUT = 4.7µF; L = 2.2µH)
1.8V
Time (50µs/div)
Load Transient Response
(VIN = 4.2V; VOUT = 3.3V; COUT = 4.7µF; L = 2.2µH)
VOUT
(AC coupled)
20mV/div
3.51V
3.26V
IOUT
200mA/div
525mA
250mA
Time (20µs/div)
Load Transient Response
(VIN = 3.6V; VOUT = 1.8V; COUT = 4.7µF; L = 2.2µH)
VOUT
(AC coupled)
20mV/div
1.914V
500mA
1.798V
IOUT
100mA/div
200mA
Time (20µs/div)
Line Transient Response
(VOUT = 1.5V; RL = 10Ω; COUT = 4.7µF; L = 2.2µH)
VIN
0.5V/div
3.6V
3.0V
VOUT
(AC coupled)
50mV/div
1.56V
1.44V
Time (50µs/div)
1171.2006.06.1.0
11
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