Datasheet

LTC3115-2
32
31152f
For more information www.linear.com/LTC3115-2
Typical applicaTions
Automotive 450kHz Regulator with 100k Maximum Resistor Value
BST1 BST2
PV
IN
V
IN
RUN
PV
OUT
VC
FB
PV
CC
PWM/SYNC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-2
L1
10µH
C
BST1
0.1µF
C
BST2
0.1µF
2.7V TO
40V
C
FF
330pF
C1
4.7µF
5V
1A V
IN
> 4V
2A V
IN
≥ 6V
C
IN
10µF
C
O
47µF × 2
R
TOP
100k
R
BOT
24.9k
C
IN
: AVX22205C106KAT2A
C
O
: GRM43ER61A476KE19L
L1: WÜRTH 744 778910
31152 TA02a
R
T
80.6k
R
FF
1.5k
R
FB
13.7k
100k
1000pF
C
FB
33nF
Fast (10µs) Line Transient
from V
IN
= 13.8V to 30V
0A to 2A Load Step, V
IN
= 13.8V0A to 800mA Load Step, V
IN
= 3.6V
INPUT VOLTAGE
(10V/DIV)
V
OUT
(200mV/DIV)
500µs/DIV
31152 TA02b
13.8V
30V
Fast (10µs) Line Transient
from V
IN
= 4V to 13.8V
INPUT VOLTAGE
(5V/DIV)
V
OUT
(100mV/DIV)
500µs/DIV
31152 TA02c
4V
13.8V
LOAD CURRENT
(500mA/DIV)
V
OUT
(200mV/DIV)
500µs/DIV
31152 TA02d
V
OUT
(100mV/DIV)
LOAD CURRENT
(1A/DIV)
500µs/DIV
31152 TA02e