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AAT1145_08 Datasheet, PDF (6/17 Pages) Advanced Analogic Technologies – 1.5A Step-Down Converter
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SwitchRegTM
Typical Characteristics
DC Regulation
(VOUT = 1.5V; TA = 25°C; L = 2.2µH; COUT = 22µF)
1.545
1.530
1.515
1.500
VIN = 5.5V
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.5V
1.485
1.470
1.455
0
300
600
900
1200
1500
Output Current (mA)
Input Current vs. Input Voltage
(VOUT = 3.3V; L = 2.2µH)
0.50
0.40
0.30
0.20
0.10
0.00
3.6
4.0
4.4
4.8
5.2
Input Voltage (V)
Start-Up Response
(VOUT = 1.8V; VIN = 3.6V; No Load;
CIN = 10µF; COUT = 22µF; L = 2.2µH)
VENABLE
(2V/div)
VOUT
(1V/div)
Time (1ms/div)
PRODUCT DATASHEET
AAT1145
1.5A Step-Down Converter
DC Regulation
(VOUT = 1.2V; TA = 25°C; L = 2.2µH; COUT = 22µF)
1.236
1.224
1.212
1.200
1.188
1.176
1.164
0
VIN = 5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.5V
300
600
900
1200
1500
Output Current (mA)
Load Transient Response
(VIN = 3.6V; VOUT = 1.8V; COUT = 22µF; CFF = 22pF)
2.2
2.0
1.8
1.6
2.2
1.5A
1.8
1.4
1.0
0.6
0.2A
0.2
-0.2
Time (200µs/div)
Soft Start
(VIN = 3.6V; VOUT = 1.8V; IOUT = 1.5A; CFF = 100pF)
6
4
2
0
-2
1.8
1.3
0.8
0.3
-0.2
Time (400µs/div)
6
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1145.2008.01.1.2
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