PRODUCT DATASHEET
AAT2688
TM
SystemPower
4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics–Channel 1
Step-Down Converter Efficiency vs. Output Current
(VOUT1 = 3.3V; L = 4.7µH)
Step-Down Converter DC Regulation
(VOUT1 = 3.3V; L = 4.7µH)
100
90
80
70
60
50
2.0
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
40
30
20
10
0
VIN1 = 6V
VIN1 = 8V
VIN1 = 12V
VIN1 = 18V
VIN1 = 24V
VIN1 = 6V
VIN1 = 8V
VIN1 = 12V
VIN1 = 18V
VIN1 = 24V
-2.0
0.1
0.1
1
10
100
1000
10000
1
10
100
1000
10000
Output Current (mA)
Output Current (mA)
Step-Down Converter Output Voltage
Step-Down Converter Switching
Error vs. Input Voltage
Frequency vs. Temperature
(VOUT1 = 3.3V; L = 4.7µH)
(VIN1 = 12V; VOUT1 = 3.3V; IOUT1 = 4.5A)
2
1
510
500
490
480
470
IOUT1 = 0.10mA
IOUT1 = 100mA
IOUT1 = 1000mA
IOUT1 = 2250mA
IOUT1 = 3500mA
IOUT1 = 4500mA
0
-1
-2
6
8
10
12
14
16
18
20
22
24
-40
-15
10
35
60
85
Input Voltage (V)
Temperature (°C)
Step-Down Converter Switching Frequency
No Load Step-Down Converter Input Current
vs. Input Voltage
vs. Input Voltage
(VOUT1 = 3.3V; IOUT1 = 4.5A)
(VEN1 = VIN1)
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
3
2
1
0
-1
-2
-3
85°C
25°C
-40°C
6
8
10
12
14
16
18
20
22
24
Input Voltage (V)
Input Voltage (V)
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2688.2008.06.1.0
5
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