AAT2749 Datasheet, PDF (7/17 Pages) Skyworks Solutions Inc. – 3.0MHz Step-Down Converter and Low-V in LDO

Typical Characteristics
Step-Down Converter Output Ripple
(V_OUT = 1.8V; V_IN = 5V; I_OUT = 1mA)
1.84
0.6
1.82
0.5
1.8
0.4
1.78
0.3
1.76
0.2
1.74
0.1
1.72
0
1.7
-0.1
1.68
-0.2
Time (20μs/div)
DATA SHEET
AAT2749
3.0MHz Step-Down Converter and Low-V_IN LDO
Step-Down Converter Output Ripple
(V_OUT = 1.8V; V_IN = 5V; I_OUT = 600mA)
1.84
3.5
1.82
3
1.8
2.5
1.78
2
1.76
1.5
1.74
1
1.72
0.5
1.7
0
1.68
-0.5
Time (200ns/div)
Step-Down Converter P-Channel R_DS(ON)
vs. Input Voltage
700
600
500
400
300
200
100
0
2.7
3.1
3.5
3.9
4.3
4.7
Input Voltage (V)
T = 120°C
T = 100°C
T = 85°C
T = 25°C
5.1
5.5
Step-Down Converter N-Channel R_DS(ON)
vs. Input Voltage
400
350
300
250
200
150
100
50
0
2.7
3.1
T = 120°C
T = 100°C
T = 85°C
T = 25°C
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Step-Down Converter Soft Start
(V_OUT = 1.8V; V_IN = 5V; I_OUT = 600mA)
6
3.5
4
3
2
2.5
0
2
-2
1.5
-4
1
-6
0.5
-8
0
-10
-0.5
Time (50μs/div)
Step-Down Converter Line Transient Response
(V_OUT = 1.2V; V_IN = 4V to 5V; I_OUT = 600mA)
6
2.4
5
2.3
4
2.2
3
2.1
2
2
1
1.9
0
1.8
-1
1.7
-2
1.6
Time (200μs/div)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012
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