Linear Technology LTC 3115-1, Datasheet

Page: 38 / 42

LTC3115-1
38
Rev. C
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TYPICAL APPLICATIONS
Miniature Size 1.5MHz 12V Supply
Load Step Transient Response, 0mA to 500mA,
V
IN
= 6V
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
VC BURST PWM
FB
PV
CC
PWM/SYNC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-1
L1
4.7µH
C
BST1
0.1µF
C
BST2
0.1µF
6V TO 40V
C
FF
33pF
12V AT 500mA
1A V
IN
> 10V
C1
4.7µF
C
I
4.7µF
C
O
10µF R
TOP
1M
R
BOT
90.9k
C
O
: MURATA GRM55DR61H106K
L1: WÜRTH 7447789004
31151 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
31151 TA07b
V
OUT
(500mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
LOAD CURRENT
(500mA/DIV)
200µs/DIV
31151 TA07c
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.1 1
31151 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
31151 TA07e
50
40
30
20
V
IN
= 6V
V
IN
= 10V
V
IN
= 24V
V
IN
= 36V