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| AAT2556 Datasheet, PDF (6/29 Pages) Advanced Analogic Technologies – Battery Charger and Step-Down Converter for Portable Applications | |||
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AAT2556
Battery Charger and Step-Down
Converter for Portable Applications
Typical Characteristics â Step-Down Converter
Efficiency vs. Load
(VOUT = 1.8V; L = 3.3µH)
100
VIN = 2.7V
90
VIN = 3.6V
80
VIN = 5.0V
70
VIN = 5.5V
60
VIN = 4.2V
50
40
0.1
1
10
100
1000
Output Current (mA)
DC Load Regulation
(VOUT = 1.8V; L = 3.3µH)
1.0
0.5
VIN = 3.6V
0.0
VIN = 2.7V
-0.5
VIN = 4.2V
VIN = 5.5V
VIN = 5.0V
-1.0
0.1
1
10
100
1000
Output Current (mA)
Efficiency vs. Load
(VOUT = 1.2V; L = 1.5µH)
100
90
VIN = 2.7V
80 VIN = 3.6V
70
60
50
40
30
0.1
VIN = 5.5V
VIN = 5.0V
VIN = 4.2V
1
10
100
1000
Output Current (mA)
DC Load Regulation
(VOUT = 1.2V; L = 1.5µH)
1.0
VIN = 5.0V
0.5
VIN = 5.5V
0.0
VIN = 3.6V
-0.5 VIN = 4.2V
VIN = 2.7V
-1.0
0.1
1
10
100
1000
Output Current (mA)
Soft Start
(VIN = 3.6V; VOUT = 1.8V;
IOUT = 250mA; CFF = 100pF)
5.0
1.6
4.0
VEN
1.4
3.0
1.2
2.0
1.0
1.0
0.8
0.0
0.6
-1.0 VO
0.4
-2.0
0.2
-3.0
0.0
-4.0
IL
-0.2
-5.0
-0.4
Time (100µs/div)
Line Regulation
(VOUT = 1.8V)
0.6
0.5
0.4
IOUT = 0mA
0.3
IOUT = 50mA
0.2
0.1
IOUT = 150mA
0.0
-0.1
-0.2
IOUT = 10mA
IOUT = 250mA
-0.3
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
Input Voltage (V)
6
2556.2006.09.1.2
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