PRODUCT DATASHEET
AAT2688
TM
SystemPower
4.5A PMIC Solution for 12V Adapter Systems with 2-Output High Performance Step-Down Converters
Typical Characteristics–Channel 2
LDO Turn-Off Response Time
LDO Turn-On Time from Enable
(VIN2 = 3.3V; VEN2 = 3.3V; VOUT2 = 1.8V; IOUT2 = 600mA)
(VIN2 = 3.3V; VEN2 = 3.3V; VOUT2 = 1.8V; IOUT2 = 600mA)
4
4
3
2
1
3
2
1
0
0
3
2
1
0
2.0
1.0
0.0
-1.0
Time (5µs/div)
Time (5µs/div)
LDO Line Transient Response
LDO Load Transient Response
(VIN2 = 3V to 4V; VOUT2 = 1.8V; IOUT2 = 600mA; COUT2 = 2.2µF)
(IOUT2 = 0.3 to 0.6A; VIN2 = 3.3V; VOUT2 = 1.8V; COUT2 = 2.2µF)
0.7
0.6
0.5
0.4
0.3
5
VIN
4
3
2
1.85
VOUT
1.85
1.80
1.75
1.80
1.75
1.70
Time (200µs/div)
Time (40µs/div)
LDO Output Voltage Noise
LDO Power Supply Rejection Ratio, PSRR
(IOUT2 = 10mA; Power BW: 300~50KHz)
(IOUT2 = 10mA; BW: 100KHz to 300KHz)
10
5
70
60
50
40
30
20
10
0
0
100
1000
10000
100000
100
1000
10000
100000
Frequency (Hz)
Frequency (Hz)
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2688.2008.06.1.0
9
ANALOGICTECH [ ADVANCED ANALOGIC TECHNOLOGIES ]
