PRODUCT DATASHEET
AAT1
149A
SwitchReg
TM
Typical Characteristics
Line Regulation
(V
OUT
= 1.875V)
0.8
0.6
2.2MHz Fast Transient 400mA Step-Down Converter
Line Transient
(V
OUT
= 1.875V; V
IN
= 3.6V to 4.2V)
Input Voltage (top) (1V/div)
5
4
3
2
1
0
0.04
0.02
0
-0.02
1
Output Voltage
(bottom) (20mV/div)
Accuracy (%)
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
2.5
400mA
0mA
100mA
600mA
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Time (200µs/div)
Line Transient
(V
OUT
= 1.875V; No Load)
4.50
1.94
1.92
1.90
1.88
1.86
1.84
1.82
1.80
1.78
N-Channel R
DS(ON)
vs. Input Voltage
(WLCSP-5)
Output Voltage (bottom) (V)
750
700
650
Input Voltage (top) (V)
4.25
4.00
3.75
3.50
3.25
3.00
2.75
2.50
R
DS(ON)
(mΩ)
Ω
600
550
500
450
400
350
300
250
2.5
25°C
3
120°C
100°C
85°C
3.5
4
4.5
5
5.5
6
Time (50µs/div)
Input Voltage (V)
P-Channel R
DS(ON)
vs. Input Voltage
(WLCSP-5)
750
650
120°C
100°C
700
Load Transient
(V
OUT
= 1.875V; V
IN
= 3.6V; I
OUT
= 1mA to 400mA)
Output Current (middle)
Inductor Current (bottom)
(500mA/div)
0.2
0
-0.2
0.5
0
0.5
0
R
DS(ON)
(mΩ)
Ω
600
550
500
450
400
350
300
250
2.5
3
3.5
4
4.5
5
5.5
6
25°C
85°C
Input Voltage (V)
Output Voltage (top)
(200mV/div)
Time (100µs/div)
6
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1149A.2008.08.1.1
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