PRODUCT DATASHEET
AAT2504178
SystemPowerTM
Adjustable 3-Channel Regulator
Typical Characteristics–Step-Down Converter
Step-Down Converter Efficiency vs. Output Current
(VOUT = 1.8V)
Output Voltage Error vs. Temperature
(VIN = 3.6V; VOUT = 2.5V)
100
90
80
70
60
50
40
30
20
10
0
0.4
0.3
400mA
600mA
0.2
0.1
0.0
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.7V
-0.1
-0.2
-0.3
-0.4
-0.5
800mA
100mA
PWM/Light Load Mode
Forced PWM Mode
0.1
1
10
100
1000
-40
-15
10
35
60
85
Output Current (mA)
Temperature (°C)
Step-Down Converter Load Regulation
(VOUT = 2.5V; Forced PWM)
Step-Down Converter Line Regulation
(VOUT = 2.5V; Forced PWM)
0.2
0.1
0.4
0.3
0.2
0.1
0.0
-0.1
-0.2
VIN = 3.6V
VIN = 3V
100mA
50mA
1mA
0.0
-0.1
-0.2
-0.3
VIN = 4.2V
800mA
600mA
VIN = 5.5V
0.1
1
10
100
1000
2.8
3.1
3.4
3.7
4.0
4.3
4.6
4.9
5.2
5.5
Output Current (mA)
Input Voltage (V)
Step-Down Converter Output Ripple
(VIN = 3.6V; VOUT = 1.8V; IOUT = 800mA)
Step-Down Converter Load Transient
(VIN = 3.6V; IOUT = 300mA to 650mA)
1.82
2.2
2.0
1.8
1.6
1.81
1.80
1.79
VOUT
VOUT
IOUT
IINDUCTOR
1.0
0.8
0.6
0.4
0.2
0.9
IL
0.6
0.3
0.0
Time (200ns/div)
Time (20µs/div)
w w w . a n a l o g i c t e c h . c o m
2504.2008.02.1.2
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ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
