PRODUCT DATASHEET
AAT2146
SwitchReg
TM
Typical Characteristics
N-Channel R
DS(ON)
vs. Input Voltage
550
1.9
Low Noise, Fast Transient 600mA Step-Down Converter
Load Transient
(V
IN
= 3.6V; V
OUT
= 1.8V; C
OUT
= 10µF; C
FF
= 100pF)
Output and Inductor Current
(100mA/div)
Output Voltage (top) (V)
500
R
DS(ON)
(mΩ)
Ω
450
400
350
300
250
200
2.5
120°C
100°C
85°C
25°C
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
300mA
1mA
300mA
1mA
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Time (50µs/div)
Load Transient
(V
IN
= 3.6V; V
OUT
= 1.8V; C
OUT
= 4.7µF; C
FF
= 0pF)
1.85
1.85
Load Transient
(V
IN
= 3.6V; V
OUT
= 1.8V; C
OUT
= 10µF; C
FF
= 0pF)
Output and Inductor Current
(100mA/div)
Output and Inductor Current
(100mA/div)
Output Voltage (top) (V)
Output Voltage (top) (V)
1.8
1.75
1.7
1.65
1.6
1.55
1.5
400mA
300mA
400mA
300mA
1.8
1.75
1.7
1.65
1.6
1.55
1.5
400mA
300mA
400mA
300mA
Time (50µs/div)
Time (50µs/div)
Load Transient
(V
IN
= 3.6V; V
OUT
= 1.8V; C
OUT
= 10µF; C
FF
= 100pF)
1.85
4.8
Line Transient
(V
OUT
= 1.8V; V
IN
= 3.6V to 4.2V; I
OUT
= 400mA; C
FF
= 0pF)
1.92
1.9
1.88
1.86
1.84
1.82
1.8
1.78
1.76
Output and Inductor Current
(100mA/div)
Output Voltage (bottom) (V)
Output Voltage (top) (V)
1.8
1.75
1.7
1.65
1.6
1.55
1.5
400mA
400mA
300mA
300mA
Input Voltage (top) (V)
4.2
3.6
3
2.4
1.8
1.2
0.6
0
Time (50µs/div)
Time (50µs/div)
2146.2008.10.1.2
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