Datasheet

40
1.E-02
1.E-01
1.E+00
1.E+01
LOAD CURRENT(A)
EFFICIENCY (%)
VIN=7V
VIN=22V
VIN=12V
50
60
70
80
90
100
40
1.E-02
1.E-01
1.E+00
1.E+01
LOAD CURRENT(A)
EFFICIENCY (%)
VIN=7V
VIN=22V
VIN=12V
50
60
70
80
90
100
700.0
JUNCTION TEMPEARTURE (
o
C)
EA gm (umho)
650.0
600.0
550.0
500.0
450.0
400.0
-40 -20 0 20 40 60 80 100 120
140
40
1.E-02
1.E-01
1.E+00
1.E+01
LOAD CURRENT(A)
EFFICIENCY (%)
VIN=7V
VIN=22V
VIN=12V
50
60
70
80
90
100
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (
o
C)
1.234
1.236
1.238
1.240
1.242
1.244
V
REF
(V)
1.232
FREQUENCY (kHz)
320
315
310
305
300
295
290
-40 -20 0 20 40 60 80 100 120
285
280
275
270
TEMPERATURE (
o
C)
LM2642
SNVS203I –MAY 2002–REVISED APRIL 2013 www.ti.com
FB Reference Voltage Operating Frequency
vs vs
Temperature Temperature
Figure 16. Figure 17.
Efficiency
Error Amplifier Gain vs
vs Load Current
Temperature Ch.1 = 5V, Ch.2 = Off
Figure 18. Figure 19.
Efficiency Efficiency
vs vs
Load Current Load Current
Ch.2 = 2.5V, Ch.1 = Off Ch.2 = 3.3V, Ch.1 = Off
Figure 20. Figure 21.
12 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2642