AAT2689 Datasheet, PDF (6/20 Pages) Advanced Analogic Technologies – PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters

PRODUCT DATASHEET
AAT2689
SystemPower^TM PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics
Step-Down Converter Load Transient Response
(I_OUT1 = 1.25A to 2.5A; V_IN1 = 12V;
V_OUT1 = 3.3V; C_OUT1 = 2x22µF)
3.0
2.5A
2.5
2.0
1.25A
1.5
1.0
3.4
3.3
3.2
Step-Down Converter Line Transient Response
(V_IN1 = 6V to 10V; V_OUT1 = 3.3V; I_OUT1 = 2.5A)
15
10
5
0
3.4
3.3
3.2
Time (100µs/div)
Time (2ms/div)
Step-Down Converter Soft Start
(V_IN1 = 12V; V_EN1 = 10V; V_OUT1 = 3.3V; I_OUT1 = 2.5A)
20
15
10
5
0
4.0
2.0
0.0
Time (500µs/div)
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-0.8
-1.0
-50
Step-Down Converter Output
Voltage Error vs. Temperature
(V_IN1 = 12V; V_OUT1 = 3.3V)
IOUT1 = 0.1mA
I_OUT1 = 1mA
IOUT1 = 1250mA
IOUT1 = 2500mA
-25
0
25
50
75
100
Temperature (°C)
Step-Down Converter Switching
Frequency vs. Temperature
(V_IN1 = 12V; I_OUT1 = 2.5A)
520
510
500
490
480
470
-40
-20
0
20
40
60
Temperature (°C)
80
100
Step-Down Converter Switching Frequency
vs. Input Voltage
(V_OUT1 = 3.3V; I_OUT1 = 2.5A)
8
6
4
2
0
-2
-4
-6
-8
-40
-20
0
20
40
60
80
100
Temperature (°C)
6
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2689.2008.06.1.0