Datasheet

LT3493
12
3493fb
APPLICATIONS INFORMATION
10μFFB
32.4k
I
LOAD
2A/DIV
I
L
0.5A/DIV
V
OUT
0.1V/DIV
AC COUPLED
I
LOAD
2A/DIV
I
L
0.5A/DIV
V
OUT
0.1V/DIV
AC COUPLED
40μs/DIV
40μs/DIV
I
LOAD
2A/DIV
I
L
0.5A/DIV
V
OUT
0.1V/DIV
AC COUPLED
40μs/DIV
10k
V
OUT
3493 F04a
3493 F04b
3493 F04c
FB
V
OUT
32.4k
10k
10μF
s2
3.3nF
SANYO
4TPB100M
FB
V
OUT
+
32.4k
10k
100μF
Figure 4. Transient Load Response of the LT3493 With Different Output Capacitors
as the Load Current is Stepped from 250mA to 1A. V
IN
= 12V, V
OUT
= 3.3V, L = 10μH
V
IN
BOOST
GND
SW
V
IN
LT3493
(5a)
D2
V
OUT
C3
V
BOOST
– V
SW
V
OUT
MAX V
BOOST
V
IN
+ V
OUT
3493 F05a
V
IN
BOOST
GND
SW
V
IN
LT3493
(5b)
D2
3493 F05b
V
OUT
C3
V
BOOST
– V
SW
V
IN
MAX V
BOOST
2V
IN
Figure 5. Two Circuits for Generating the Boost Voltage