lt3493edcb-3 Linear Technology Corporation, lt3493edcb-3 Datasheet - Page 12

• Manufacturer Part Number: lt3493edcb-3
• Description: 1.2a, 750khz Step-down Switching Regulator In 2mm X 3mm Dfn
• Manufacturer: Linear Technology Corporation

APPLICATIO S I FOR ATIO
LT3493-3
12
V
IN
V
MAX V
BOOST
BOOST
V
IN
– V
32.4k
FB
LT3493-3
SW
10k
U
BOOST
≅ V
GND
Figure 4. Transient Load Response of the LT3493-3 with Different Output Capacitors
as the Load Current is Stepped from 250mA to 1A. V
32.4k
32.4k
≅ V
FB
FB
10k
10k
IN
OUT
+ V
SW
U
OUT
(5a)
3.3nF
+
Figure 5. Two Circuits for Generating the Boost Voltage
C3
W
10µF
10µF
×2
100µF
SANYO
4TPB100M
V
V
V
OUT
OUT
OUT
D2
3493-3 F05a
U
V
OUT
AC COUPLED
AC COUPLED
AC COUPLED
0.5A/DIV
0.1V/DIV
0.5A/DIV
0.1V/DIV
0.5A/DIV
0.1V/DIV
2A/DIV
2A/DIV
2A/DIV
I
I
I
V
V
V
LOAD
LOAD
LOAD
OUT
OUT
OUT
I
I
I
L
L
L
IN
V
= 12V, V
IN
V
MAX V
BOOST
OUT
V
BOOST
D2
IN
– V
40µs/DIV
40µs/DIV
40µs/DIV
= 3.3V, L = 10µH
LT3493-3
SW
BOOST
≅ 2V
GND
≅ V
IN
IN
SW
(5b)
3493-3 F04c
3493-3 F04a
3493-3 F04b
C3
3493-3 F05b
V
OUT
3493-3f