LTC3115-2_15 Datasheet, PDF (36/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
Typical Applications
24V 750kHz Industrial Power Rail from 20V to 40V Input
20V TO 40V
R1
OPEN
500k
DRAIN
OUTPUT
ON OFF
C_BST1
0.1µF
L1
22µH
C_BST2
0.1µF
C_IN
10µF
BST1 SW1
PV_IN
V_IN
SW2 BST2
PV_OUT
RUN
LTC3115-2
VC
*
*OPTIONAL: INSTALL IN
APPLICATIONS SUBJECT TO
OUTPUT OVERLOAD OR
SHORT-CIRCUIT CONDITIONS
+
1µF
R_FB
25k
C_O
82µF
C_FB
3300pF
100pF
R_TOP
1M
24V
1.5A
C_FF
100pF
R_FF
51k
FB
RT
PWM/SYNC
PV_CC
V_CC
GND
PGND
C_O: OS-CON 35SVPF82M
WÜRTH: 744 066 220
Regulated Output Voltage from
a Time Varying Input Rail
R_T
47.5k
C1
4.7µF
31152 TA05a
R_BOT
43.2k
Fast (20µs) Input Voltage
Transient, V_IN = 20V to 35V
V_IN
(5V/DIV)
V_OUT
(5V/DIV)
40V
20V
35V
INPUT VOLTAGE
(5V/DIV)
20V
V_OUT
(200mV/DIV)
10ms/DIV
31152 TA05b
500µs/DIV
31152 TA05e
0A to 1.5A Load Step, V_IN = 20V
LOAD
CURRENT
(1A/DIV)
V_OUT
(500mV/DIV)
INDUCTOR
CURRENT
(2A/DIV)
500µs/DIV
31152 TA05c
Efficiency vs Load Current
100
90
80
70
60
50
40
30
20
0.01
V_IN = 20V
V_IN = 24V
V_IN = 36V
0.10
LOAD CURRENT (A)
1
31152 TA05d
36
For more information www.linear.com/LTC3115-2
31152fa