AAT2749 Datasheet, PDF (6/17 Pages) Skyworks Solutions Inc. – 3.0MHz Step-Down Converter and Low-V in LDO

Typical Characteristics
Step-Down Converter Switching Frequency
vs. Input Voltage
(VOUT = 1.8V; IOUT = 100mA)
3
2
1
0
-1
-2
-3
-4
-5
2.3
2.8
3.3
3.8
4.3
4.8
5.3
Input Voltage (V)
DATA SHEET
AAT2749
3.0MHz Step-Down Converter and Low-V_IN LDO
Step-Down Converter Switching Frequency
vs. Temperature
(VOUT = 1.8V; IOUT = 100mA)
3.02
3
2.98
2.96
2.94
2.92
2.9
2.88
2.86
2.84
2.82
-40
-15
10
35
60
85
Temperature (°C)
Step-Down Converter Efficiency vs. Load
(V_OUT = 1.8V; L = 2.2μH; LL Mode)
100
90
80
70
60
50
40
30
20
10
0
0.1
1
VIN = 5.5V
VIN = 4.2V
VIN = 3.3V
VIN = 2.7V
VIN = 2.3V
10
100
1000
Output Current (mA)
Step-Down Converter DC Regulation
(V_OUT = 1.8V; L = 2.2μH; LL Mode)
1
0.8
VIN = 5.5V
0.6
VIN = 4.2V
VIN = 3.3V
0.4
VIN = 2.7V
0.2
VIN = 2.3V
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
1
10
100
1000
Output Current (mA)
Step-Down Converter Efficiency vs. Load
(V_OUT = 1.8V; L = 2.2μH; PWM Mode)
100
90
80
70
60
50
40
30
20
10
0
0.1
1
VIN = 5.5V
VIN = 4.2V
VIN = 3.3V
VIN = 2.7V
VIN = 2.3V
10
100
1000
Output Current (mA)
Step-Down Converter DC Regulation
(V_OUT = 1.8V; L = 2.2μH; PWM Mode)
1
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1
0.1
1
VIN = 5.5V
VIN = 4.2V
VIN = 3.3V
VIN = 2.7V
VIN = 2.3V
10
100
1000
Output Current (mA)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
6
202037A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • June 8, 2012