PRODUCT DATASHEET
AAT2503178
SystemPowerTM
Adjustable 3-Channel Regulator
Typical Characteristics—Step-Down Converter
Efficiency vs. Output Current
(VOUT = 0.9V; L = 1µH)
Efficiency vs. Output Current
(VOUT = 1.8V; L = 2.2µH)
100
90
80
70
60
50
40
30
20
10
0
90
80
70
60
50
40
30
20
10
0
VIN = 3.6V
VIN = 2.7V
PWM Only
VIN = 2.7V
VIN = 3.6V
PWM Only
Mode
VIN = 4.2V
Mode
VIN = 4.2V
0
0
0
1
10
100
1000
1000
1000
0
1
10
100
1000
Output Current (mA)
Output Current (mA)
Efficiency vs. Output Current
(VOUT = 2.5V; L = 3.3µH)
Switching Frequency vs. Temperature
(VIN = 3.6V; IOUT = 800mA)
100
90
80
70
60
50
40
30
20
10
0
2.4
2.3
2.2
2.1
2.0
1.9
1.8
1.7
1.6
1.5
VOUT = 0.9V
VOUT = 1.8V
VOUT = 2.5V
VIN = 3.3V
VIN = 3.6V
PWM Only
Mode
VIN = 4.2V
1
10
100
-40
-20
0
20
40
60
80
100
Output Current (mA)
Temperature (°°C)
Load Regulation
(VOUT = 1.8V; VMODE/SYNC = VIN; L = 2.2µH)
Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA)
6.0
4.0
2.0
0.0
1.2
0.9
ENABLE
1.8V
0.6
VIN = 4.2V
0.3
0.0
0V
VOUT
-0.3
-0.6
-0.9
-1.2
1.0
0.5
0.0
-0.5
VIN = 3.6V
VIN = 3.3V
IINDUCTOR
1
10
100
Time (100µs/div)
Output Current (mA)
w w w . a n a l o g i c t e c h . c o m
6
2503.2008.02.1.4
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
