PRODUCT DATASHEET
AAT1145
SwitchReg
TM
Typical Characteristics
Output Voltage vs. Output Current
(V
OUT
= 1.5V; T
A
= 25°C; L = 2.2µH)
°
1.55
1.54
1.230
1.2A Step-Down Converter
Output Voltage vs. Output Current
(V
OUT
= 1.2V; T
A
= 25°C; L = 2.2µH)
°
Output Voltage (V)
Output Voltage (V)
1.53
1.52
1.51
1.5
1.49
1.48
1.47
1.46
1.45
0
200
400
600
800
1000
1200
1.220
1.210
1.200
1.190
1.180
1.170
1.160
0
200
400
600
800
1000
1200
V
IN
= 5.0V
V
IN
= 4.2V
V
IN
= 3.6V
V
IN
= 5.0V
V
IN
= 3.6V
V
IN
= 2.5V
V
IN
= 2.5V
V
IN
= 4.2V
Output Current (mA)
Output Current (mA)
Input Current vs. Input Voltage
(V
OUT
= 3.3V; L = 2.2µH)
5
4.5
Load Transient Response
(V
OUT
= 1.8V, AC Coupled; V
IN
= 3.6V;
150mA to 1.2A; L = 2.2µH)
Input Current (mA)
4
3.5
3
2.5
2
1.5
1
0.5
0
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
5.2
5.4
V
OUT
(100mV/div)
1.2A
I
OUT
(500mA/div)
150mA
Input Voltage (V)
Time (40µs/div)
Start-Up Response
(V
OUT
= 1.8V; V
IN
= 3.6V; No Load;
C
IN
= 10µF; C
OUT
= 22µF; L = 2.2µH)
V
ENABLE
(2V/div)
V
ENABLE
(2V/div)
Start-Up Response
(V
OUT
= 1.8V; V
IN
= 3.6V; I
LOAD
= 1.2A;
C
IN
= 10µF; C
OUT
= 22µF; L = 2.2µH)
V
OUT
(1V/div)
I
IN
(500mA/div)
V
OUT
(1V/div)
Time (1ms/div)
Time (1ms/div)
6
www.analogictech.com
1145.2007.11.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
