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 Output Voltage Error
Step-Down Converter Output Ripple
(VIN1 = 12V; VOUT1 = 3.3V; IOUT1 = 4.5A)
vs. Temperature
(VIN1 = 12V; VOUT1 = 3.3V)
3.31
0.6
3.30
3.29
IOUT1 = 0.10mA
IOUT1 = 10mA
0.4
0.2
I
OUT1 = 2250mA
IOUT1 = 4500mA
12V
0.0
0V
-0.2
-0.4
-0.6
5
4
3
-40
-15
10
35
60
85
Temperature (°C)
Time (1µs/div)
Step-Down Converter Output Ripple
Step-Down Converter Load Transient Response
(IOUT1 = 3.375A to 4.5A; VIN1 = 12V; COUT1 = 3x22µF)
(VIN1 = 12V; VOUT1 = 3.3V; IOUT1 = 1mA)
6
3.31
3.30
3.29
5
4.5A
4
3.375A
3
12V
0V
3.4
3.3
3.2
1
0
-1
Time (1µs/div)
Time (100µs/div)
Step-Down Converter Load Transient Response
(IOUT1 = 2.25 to 4.5A; VIN1 = 12V; COUT1 = 3x22µF)
Step-Down Converter Load Transient Response
(IOUT1 = 0.45A to 4.5A; VIN1 = 12V; COUT1 = 3x22µF)
6
4.5A
4
5
4
3
2
4.5A
2
0.45A
0
2.25A
3.7
3.5
3.3
3.1
2.9
3.5
3.3
3.1
Time (100µs/div)
Time (100µs/div)
w w w . a n a l o g i c t e c h . c o m
6
2688.2008.06.1.0
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
