PRODUCT DATASHEET
AAT2689
SystemPower
TM
PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics
LDO Turn-Off Response Time
(V
IN2
= 3.3V; V
EN2
= 3.3V; V
OUT2
= 1.8V; I
OUT2
= 600mA)
4
3
4
3
LDO Turn-On Time from Enable
(V
IN2
= 3.3V; V
EN2
= 3.3V; V
OUT2
= 1.8V; I
OUT2
= 600mA)
Enable Voltage
(top) (V)
Enable Voltage
(top) (V)
2
1
0
2.0
1.0
0.0
-1.0
2
1
0
3
2
1
0
Output Voltage
(bottom) (V)
Output Voltage
(bottom) (V)
Time (5µs/div)
Time (5µs/div)
LDO Output Voltage Error vs. Temperature
(V
IN2
= 3.3V; V
OUT2
= 1.8V)
3.0
0.7
LDO Load Transient Response
(I
OUT2
= 0.3A to 0.6A; V
IN2
= 3.3V; V
OUT2
= 1.8V; C
OUT2
= 2.2µF)
Output Voltage Error (%)
2.0
1.0
0.0
-1.0
-2.0
-3.0
-50
Output Current
(top) (A)
I
OUT2
= 0.1mA
I
OUT2
= 300mA
I
OUT2
= 600mA
0.6
0.5
0.4
0.3
1.90
1.85
1.80
1.75
Output Voltage
(bottom) (V)
-25
0
25
50
75
100
Temperature (°C)
Time (40µs/div)
LDO Load Transient Response
(I
OUT2
= 0.06A to 0.6A; V
IN2
= 3.3V; V
OUT2
= 1.8V; C
OUT2
= 2.2µF)
0.8
0.6
0.6A
LDO Line Transient Response
(V
IN2
= 3V to 4V; V
OUT2
= 1.8V; I
OUT2
= 600mA; C
OUT2
= 2.2µF)
5
Output Voltage
(AC Coupled) (bottom) (V)
Output Current
(top) (A)
Input Voltage
(top) (V)
0.4
0.2
0.0
0.06A
4
3
2
V
IN
Output Voltage
(bottom) (V)
1.90
1.80
1.70
1.60
V
OUT
1.85
1.80
1.75
1.70
Time (40µs/div)
Time (200µs/div)
8
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2689.2008.06.1.0
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