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LM46002-Q1_15 Datasheet, PDF (11/52 Pages) Texas Instruments – SIMPLE SWITCHER 3.5 V to 60 V 2 A Synchronous Step-Down Voltage Converter
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LM46002-Q1
SNVSAA2A – JULY 2015 – REVISED AUGUST 2015
Typical Characteristics (continued)
Unless otherwise specified, VIN = 24 V, VOUT = 3.3 V, FS = 500 kHz, L = 10 µH, COUT = 150 µF, CFF = 47 pF. Please refer to
Application Performance Curves for Bill of Materials (BOM) for other VOUT and FS combinations.
1.E+06
1.0E+06
1.E+05
1.E+04
3.5
3.7
VOUT = 3.3 V
3.9
4.1
VIN (V)
FS = 500 kHz
Load=0.01A
Load=0.1A
Load=0.5A
Load=1A
Load=1.5A
Load=2A
4.3
4.5
C009
Figure 19. Switching Frequency vs VIN in Drop-Out
Operation
80
Evaluation Board
70
EN 55022 Class B Limit
EN 55022 Class A Limit
60
50
40
30
20
10
0
0
200
400
600
800
1000
Frequency (MHz)
C001
VOUT = 3.3 V
FS = 500 kHz
IOUT = 2 A
Measured on the LM46002QPWPEVM with default BOM. No input
filter used.
Figure 21. Radiated EMI Curve
100
Peak Emissions
90
Quasi Peak Limit
80
Average Limit
70
60
50
40
30
20
10
0
0.1
1
10
100
Frequency (MHz)
C001
VOUT = 3.3 V
FS = 500 kHz
IOUT = 2 A
Measured on the LM46002QPWPEVM with default BOM. Input
filter: Lin = 1 µH Cd = 47 µF CIN4 = 68 µF
Figure 23. Conducted EMI Curve
1.0E+05
1.0E+04
5.0
5.5
VOUT = 5 V
6.0
VIN (V)
FS = 1 MHz
Load=0.1A
Load=0.5A
Load=1A
Load=1.5A
Load=2A
6.5
7.0
C005
Figure 20. Switching Frequency vs VIN in Drop-Out
Operation
80
Evaluation Board
70
EN 55022 Class B Limit
EN 55022 Class A Limit
60
50
40
30
20
10
0
0
200
400
600
800
1000
Frequency (MHz)
C001
VOUT = 5 V
FS = 1 MHz
IOUT = 2 A
Measured on the LM46002QPWPEVM with L = 6.8 µH, COUT = 47
µF, CFF = 47 pF. No input filter used.
Figure 22. Radiated EMI Curve
100
Peak Emissions
90
Quasi Peak Limit
80
Average Limit
70
60
50
40
30
20
10
0
0.1
1
10
100
Frequency (MHz)
C001
VOUT = 5 V
FS = 1 MHz
IOUT = 2 A
Measured on the LM46002QPWPEVM with L = 6.8 µH, COUT = 47
µF, CFF = 47 pF. Input filter Lin = 1 µH Cd = 47 µF CIN4 = 68 µF
Figure 24. Conducted EMI Curve
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