PRODUCT DATASHEET
AAT1145
SwitchRegTM
1.2A Step-Down Converter
Typical Characteristics
Output Voltage vs. Output Current
(VOUT = 1.5V; TA = 25°C; L = 2.2µH)
Output Voltage vs. Output Current
(VOUT = 1.2V; TA = 25°C; L = 2.2µH)
1.55
1.54
1.53
1.52
1.230
1.220
1.210
1.200
1.190
1.180
1.170
1.160
VIN = 5.0V
VIN = 3.6V
VIN = 5.0V
VIN = 4.2V
1.51
1.5
1.49
1.48
1.47
1.46
1.45
VIN = 3.6V
VIN = 4.2V
VIN = 2.5V
VIN = 2.5V
0
200
400
600
800
1000
1200
0
200
400
600
800
1000
1200
Output Current (mA)
Output Current (mA)
Input Current vs. Input Voltage
(VOUT = 3.3V; L = 2.2µH)
Load Transient Response
(VOUT = 1.8V, AC Coupled; VIN = 3.6V;
150mA to 1.2A; L = 2.2µH)
5
4.5
4
VOUT
(100mV/div)
3.5
3
2.5
2
1.2A
1.5
1
IOUT
(500mA/div)
150mA
0.5
0
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
5.2
5.4
Input Voltage (V)
Time (40µs/div)
Start-Up Response
(VOUT = 1.8V; VIN = 3.6V; No Load;
CIN = 10µF; COUT = 22µF; L = 2.2µH)
Start-Up Response
(VOUT = 1.8V; VIN = 3.6V; ILOAD = 1.2A;
CIN = 10µF; COUT = 22µF; L = 2.2µH)
VENABLE
(2V/div)
VENABLE
(2V/div)
VOUT
(1V/div)
VOUT
(1V/div)
IIN
(500mA/div)
Time (1ms/div)
Time (1ms/div)
w w w . a n a l o g i c t e c h . c o m
6
1145.2007.11.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
