PRODUCT DATASHEET
AAT2689
TM
SystemPower PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics
Step-Down Converter Load Transient Response
(IOUT1 = 1.25A to 2.5A; VIN1 = 12V;
Step-Down Converter Line Transient Response
(VIN1 = 6V to 10V; VOUT1 = 3.3V; IOUT1 = 2.5A)
VOUT1 = 3.3V; COUT1 = 2x22µF)
3.0
15
10
5
2.5A
2.5
2.0
1.5
1.0
1.25A
0
3.4
3.3
3.2
3.4
3.3
3.2
Time (100µs/div)
Time (2ms/div)
Step-Down Converter Soft Start
Step-Down Converter Output
(VIN1 = 12V; VEN1 = 10V; VOUT1 = 3.3V; IOUT1 = 2.5A)
Voltage Error vs. Temperature
(VIN1 = 12V; VOUT1 = 3.3V)
20
15
10
5
1.0
IOUT1 = 0.1mA
IOUT1 = 1mA
0.8
0.6
I
OUT1 = 1250mA
0.4
IOUT1 = 2500mA
0.2
0
0.0
4.0
2.0
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
-25
0
25
50
75
100
Temperature (°C)
Time (500µs/div)
Step-Down Converter Switching
Step-Down Converter Switching Frequency
Frequency vs. Temperature
vs. Input Voltage
(VIN1 = 12V; IOUT1 = 2.5A)
(VOUT1 = 3.3V; IOUT1 = 2.5A)
520
8
6
4
510
500
490
480
470
2
0
-2
-4
-6
-8
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
w w w . a n a l o g i c t e c h . c o m
6
2689.2008.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
