PRODUCT DATASHEET
AAT1218
SwitchReg
TM
Typical Characteristics
V
IN
= 3.6V, V
OUT
= 3.6V, C
IN
= 22μF, C
OUT
= 44uF; L = 2.2μH; T
A
= 25°C, unless otherwise noted.
1A, 1.2MHz Synchronous Boost Converter
Maximum Load Current at Startup vs. V
IN
10000
100
90
80
AAT1218 3.3V Output Efficiency
Load Current (mA)
Efficiency (%)
1000
70
60
50
40
30
20
10
0
0.1
1
10
100
10
0.85
V
OUT
= 3.3V
V
OUT
= 5V
1.35
1.85
2.35
2.85
3.35
3.85
4.35
4.85
V
IN
= 1.2V
V
IN
= 1.5V
V
IN
= 1.8V
V
IN
= 2.4V
100
1000
Input Voltage (V)
I
LOAD
(mA)
AAT1218 5.0V Output Efficiency
100
90
80
100
90
80
AAT1218 5.0V Output Efficiency
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
1
10
100
V
IN
= 1.2V
V
IN
= 1.5V
V
IN
= 2.4V
1000
V
IN
= 3.0V
V
IN
= 3.3V
V
IN
= 3.6V
V
IN
= 4.2V
1000
10000
I
LOAD
(mA)
I
LOAD
(mA)
Soft Start Waveform
(V
IN
= 1.5V; V
OUT
= 5V; Load = 100mA)
Anti-Ringing Operation
(V
IN
= 3V; V
OUT
= 5V; Load = 10mA)
LX
(4V/div)
V
OUT
(4V/div)
I
IN
(0.5A/div)
V
EN
(1V/div)
0
V
OUT
(AC Coupled)
(20mV/div)
0
0
0
0
LX
(2V/div)
0
Time (200µs/div)
Time (0.2µs/div)
6
www.analogictech.com
1218.2008.10.1.1
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
