Datasheet

LTC3115-2
35
31152f
For more information www.linear.com/LTC3115-2
Typical applicaTions
24V 750kHz Industrial Power Rail from 20V to 40V Input
Regulated Output Voltage from
a Time Varying Input Rail
Fast (20µs) Input Voltage
Transient, V
IN
= 20V to 35V
0A to 1.5A Load Step, V
IN
= 20V
Efficiency vs Load Current
BST1 BST2
PV
IN
V
IN
RUN
PV
OUT
VC
FB
RT
PV
CC
V
CC
PWM/SYNC
SW1 SW2
GND PGND
LTC3115-2
L1
22µH
C
BST1
0.1µF
C
BST2
0.1µF
20V TO 40V
OPEN
DRAIN
OUTPUT
C
FF
100pF
C1
4.7µF
24V
1.5A
C
IN
10µF
C
O
82µF
1µF
*
R
TOP
1M
R
BOT
43.2k
R
T
47.5k
C
O
: OS-CON 35SVPF82M
WÜRTH: 744 066 220
*OPTIONAL: INSTALL IN
APPLICATIONS SUBJECT TO
OUTPUT OVERLOAD OR
SHORT-CIRCUIT CONDITIONS
31152 TA05a
R
FF
51k
R
FB
25k
C
FB
3300pF
100pF
R1
500k
+
ON OFF
V
IN
(5V/DIV)
V
OUT
(5V/DIV)
10ms/DIV
31152 TA05b
40V
20V
LOAD
CURRENT
(1A/DIV)
INDUCTOR
CURRENT
(2A/DIV)
V
OUT
(500mV/DIV)
500µs/DIV
31152 TA05c
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.10 1
31152 TA05d
40
50
70
90
30
20
V
IN
= 20V
V
IN
= 24V
V
IN
= 36V
INPUT VOLTAGE
(5V/DIV)
V
OUT
(200mV/DIV)
500µs/DIV
31152 TA05e
35V
20V