PRODUCT DATASHEET
AAT2153
SwitchReg
TM
Typical Characteristics
Quiescent Current vs. Input Voltage
(V
OUT
= 1.8V; No Load)
Output Voltage Error (%)
80
1.5
1.0
0.5
0.0
-0.5
-1.0
-1.5
-2.0
-2.5
-3.0
-3.5
-40 -30 -20 -10
0
10
20
30
40
50
60
70
80
90
2.5A Low Noise Step-Down Converter
Output Voltage vs. Temperature
(V
OUT
= 1.8V; I
OUT
= 2.5A)
Quiescent Current (µA)
70
60
50
40
30
20
10
0
85°C
25°C
-40°C
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
Input
Voltage (V)
Temperature (°C)
Output Voltage vs. Input Voltage
Switching Frequency Variation (%)
(V
OUT
= 1.8V; I
OUT
= 1A)
1.82
1.81
Switching Frequency vs. Temperature
(V
OUT
= 1.8V; I
OUT
= 2.5A)
1
0
-1
-2
-3
-4
-5
-6
-40
-30
-20
-10
0
10
20
30
40
50
60
70
80
90
85°C
Output Voltage (V)
1.80
1.79
1.78
1.77
1.76
1.75
1.74
1.73
2.7 2.9 3.1 3.3 3.5 3.7 3.9 4.1 4.3 4.5 4.7 4.9 5.1 5.3 5.5
25°C
-40°C
Input Voltage (V)
Temperature (°C)
Load Transient Response
(V
OUT
= 1.8V)
Output Voltage (AC coupled)
(top)(mV)
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
-0.50
-0.60
Load Transient Response
(V
OUT
= 1.8V; C
FF
= 100pF)
Output Voltage (AC coupled)
(top)(mV)
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.20
0.10
0.00
-0.10
-0.20
-0.30
-0.40
-0.50
-0.60
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
Output Current
(bottom) (A)
Output Current
(bottom) (A)
Time (100µs/div)
Time (100µs/div)
6
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2153.2008.09.1.0
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