PRODUCT DATASHEET
AAT2786
TM
SystemPower
1.5A Step-Down Converter and 150mA LDO
Typical Characteristics–Step-Down Converter
Heavy Load Switching Waveform
(PWM Mode; VIN = 3.6V; VOUT = 1.8V; 1.5A Load)
Light Load Switching Waveform
(PWM Mode; VIN = 3.6V; VOUT = 1.8V; 1mA Load)
4.0
2.0
1200
1000
800
600
400
200
0
4.0
2.0
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.0
0.0
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
-2.0
-4.0
-6.0
-8.0
-10.0
-12.0
-200
-400
Time (2.5µs/div)
Time (2.5µs/div)
Light Load Switching Waveform
Load Transient Response
(Light-Load Mode; VIN = 3.6V; VOUT = 1.8V; 1mA Load)
(VIN = 3.6V; VOUT = 1.8V; CFF = 100pF)
8.0
4.0
700
600
500
400
300
200
100
0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
0.0
-4.0
-8.0
-12.0
-16.0
-20.0
-24.0
-100
Time (100µs/div)
Time (50µs/div)
Load Transient Response
Line Transient Response
(VOUT = 1.8V; 1.5A Load)
(VIN = 3.6V; VOUT = 1.8V; No CFF
)
2.5
2.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-0.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
Time (50µs/div)
Time (200µs/div)
w w w . a n a l o g i c t e c h . c o m
10
2786.2008.04.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
