PRODUCT DATASHEET
AAT2688
SystemPower
TM
4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics–Channel 1
Step-Down Converter Output Voltage Error
vs. Temperature
(V
IN1
= 12V; V
OUT1
= 3.3V)
Output Voltage Error (%)
0.6
0.4
0.2
0.0
-0.2
-0.4
-0.6
-40
Step-Down Converter Output Ripple
(V
IN1
= 12V; V
OUT1
= 3.3V; I
OUT1
= 4.5A)
LX Voltage (middle) (V)
Inductor Current (bottom) (A)
3.31
3.30
Output Voltage
(top) (V)
I
OUT1
= 0.10mA
I
OUT1
= 10mA
I
OUT1
= 2250mA
I
OUT1
= 4500mA
3.29
12V
0V
5
4
3
-15
10
35
60
85
Temperature (°C)
Time (1µs/div)
Step-Down Converter Output Ripple
(V
IN1
= 12V; V
OUT1
= 3.3V; I
OUT1
= 1mA)
LX Voltage (middle) (V)
Inductor Current (bottom) (A)
3.31
3.30
Step-Down Converter Load Transient Response
(I
OUT1
= 3.375A to 4.5A; V
IN1
= 12V; C
OUT1
= 3x22µF)
Output Voltage (bottom) (V)
6
Output Current (top) (A)
4.5A
3.375A
5
4
3
Output Voltage
(top) (V)
3.29
12V
0V
1
0
-1
3.4
3.3
3.2
Time (1µs/div)
Time (100µs/div)
Step-Down Converter Load Transient Response
(I
OUT1
= 2.25 to 4.5A; V
IN1
= 12V; C
OUT1
= 3x22µF)
Output Voltage (bottom) (V)
Step-Down Converter Load Transient Response
(I
OUT1
= 0.45A to 4.5A; V
IN1
= 12V; C
OUT1
= 3x22µF)
Output Voltage (bottom) (V)
4.5A
6
Output Current (top) (A)
Output Current (top) (A)
4.5A
5
4
4
0.45A
2
0
3.7
3.5
3.3
3.1
2.9
2.25A
3
2
3.5
3.3
3.1
Time (100µs/div)
Time (100µs/div)
6
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2688.2008.06.1.0
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