PRODUCT DATASHEET
AAT2153
SwitchReg
TM
Typical Characteristics
Heavy Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 2.5A; R1 = 10Ω; C
OUT
= 22μF)
Output Voltage (AC Coupled)
(top) (mV)
Inductor Ripple Current
(bottom) (A)
10
0
-10
2.8
2.6
2.4
2.2
2.5A Low Noise Step-Down Converter
Heavy Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 2.5A; R1 = 0Ω; C
OUT
= 2x22μF)
Output Voltage (AC Coupled)
(top) (mV)
Inductor Ripple Current
(bottom) (A)
10
0
-10
2.8
2.6
2.4
2.2
Time (400ns/div)
Time (400ns/div)
Light Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 1mA; C
FF
= 0pF)
Output Voltage (AC coupled)
(top)(mV)
Output Voltage (AC coupled)
(top)(mV)
80
40
0
-40
-80
-120
-160
-200
-240
0.7
80
40
0
-40
-80
-120
-160
-200
-240
Light Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 1mA; C
FF
= 0pF)
0.7
Inductor Ripple Current
(bottom) (A)
Inductor Ripple Current
(bottom) (A)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
Time (5µs/div)
Time (200µs/div)
Light Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 1mA; C
FF
= 100pF)
Output Voltage (AC coupled)
(top)(mV)
80
40
0
-40
-80
-120
-160
-200
-240
0.7
Light Load Switching Waveform
(V
IN
= 3.6V; V
OUT
= 1.8V; I
OUT
= 1mA; C
FF
= 100pF)
Output Voltage (AC coupled)
(top)(mV)
80
40
0
-40
-80
-120
-160
-200
-240
0.7
Inductor Ripple Current
(bottom) (A)
Inductor Ripple Current
(bottom) (A)
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
0.6
0.5
0.4
0.3
0.2
0.1
0.0
-0.1
Time (5µs/div)
Time (500µs/div)
2153.2008.09.1.0
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