AAT1149B Datasheet, PDF (6/17 Pages) Advanced Analogic Technologies – 2.2MHz Fast Transient 400mA Step-Down Converter

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PRODUCT DATASHEET
AAT1149B
2.2MHz Fast Transient 400mA Step-Down Converter
Typical Characteristics
Line Regulation
(V_OUT = 1.8V)
1
0.8
0.6
400mA
0.4
0.2
0mA
100mA
0
-0.2
-0.4
-0.6 600mA
-0.8
-1
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Line Transient
(V_OUT = 1.8V; V_IN = 3.6V to 4.2V)
5
4
3
2
1
0.04
0
0.02
0
-0.02
Time (200µs/div)
Line Transient
(V_OUT = 1.8V; No Load)
4.50
1.94
4.25
1.92
4.00
1.90
3.75
1.88
3.50
1.86
3.25
1.84
3.00
1.82
2.75
1.80
2.50
1.78
Time (50µs/div)
N-Channel R_DS(ON) vs. Input Voltage
(WLCSP-5)
750
700
650
600
120°C
100°C
550
500
450
85°C
400
350
300
25°C
250
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
P-Channel R_DS(ON) vs. Input Voltage
(WLCSP-5)
750
700
650
120°C
100°C
600
550
500
450
85°C
400
350
25°C
300
250
2.5
3
3.5
4
4.5
5
5.5
6
Input Voltage (V)
Step-Down Converter Load Transient Response
(V_IN = 3.6V; V_OUT = 1.8V; I_OUT = 40mA to 400mA; C_OUT = 4.7µF)
0.6
400mA
0.4
0.2
40mA
0.0
2.2
2.0
1.8
1.6
1.4
Time (100µs/div)
6
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1149B.2008.07.1.0