Datasheet

LTC3115-2
37
31152f
For more information www.linear.com/LTC3115-2
Typical applicaTions
1.5MHz, 12V Regulator with 8V to 40V Input Voltage Range
Load Step Transient Response,
0mA to 500mA, V
IN
= 8V
Load Step Transient Response,
0mA to 500mA, V
IN
= 24V
Efficiency vs Load Current,
PWM Mode
Efficiency vs Load Current,
Burst Mode Operation
BST1 BST2
PV
IN
V
IN
RUN
PV
OUT
VCBURST PWM
FB
PV
CC
PWM/SYNC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-2
L1
4.7µH
C
BST1
0.1µF
C
BST2
0.1µF
8V TO 40V
C
FF
33pF
12V AT 500mA
1A V
IN
> 10V
C1
4.7µF
C
I
4.7µF
C
O
22µF
R
TOP
1M
R
BOT
90.9k
C
O
: TDK C3225X7R1C226k
L1: COILCRAFT MOS6020-472MX
31152 TA07a
R
T
23.7k
R
FF
15k
R
FB
15k
C
FB
1000pF
V
OUT
(500mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
LOAD CURRENT
(500mA/DIV)
200µs/DIV
31152 TA07b
V
OUT
(500mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
LOAD CURRENT
(500mA/DIV)
200µs/DIV
31152 TA07c
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.1 1
31152 TA07d
40
50
70
90
30
20
V
IN
= 6V
V
IN
= 10V
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (mA)
0.1
60
EFFICIENCY (%)
70
80
90
1 10 100
31152 TA07e
50
40
30
20
V
IN
= 6V
V
IN
= 10V
V
IN
= 24V
V
IN
= 36V