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ManualsBrandsLinear Technology ManualsDC / DC Adjustable Switching RegulatorsDC/DC Converter Step-Up/Step-Down TSSOP-2.7 ... 40V
31323334353637383940
LTC3115-1
37
31151fb
For more information www.linear.com/LTC3115-1
Typical applicaTions
USB, FireWire, Automotive and Unregulated Wall Adapter to Regulated 5V (750kHz)
Efficiency vs Load Current,
from Automotive Input
Soft-Start Waveform, V
IN
= 24V, I
LOAD
= 0.5A
Output Voltage Transient Response,
750mA Load Step, Powered from Automotive Input
BST1 BST2
PV
IN
V
IN
10µF
RUN
PWM/SYNC
PV
OUT
VC
FB
PV
CC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-1
L1
10µH
D4
D3
D2
D1
C
BST1
0.1µF
C
BST2
0.1µF
USB
4.1V TO 5.5V
FireWire
8V TO 36V
AUTOMOTIVE
3.6V TO 40V
WALL ADAPTER
4V TO 40V
C
FF
47pF
C1
4.7µF
5V
750mA
C
O
47µF
×2
R
TOP
1M
R
BOT
249k
C
IN
: MURATA GRM55DR61H106K
C
O
: GRM43ER60J476
D1-D4: B360A-13-F
L1: COILCRAFT LPS6225
31151 TA06a
R
T
47.5k
R
FF
51k
R
FB
100k
C
FB
4700pF
BURST PWM
OFF ON
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.1 1
31151 TA06b
40
50
70
90
30
20
V
IN
= 3.6V
V
IN
= 5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
OUT
(200mV/DIV)
V
OUT
(200mV/DIV)
V
OUT
(200mV/DIV)
1ms/DIV
31151 TA06d
V
IN
= 36V
V
IN
= 12V
V
IN
= 3.6V
V
RUN
(5V/DIV)
V
OUT
(2V/DIV)
V
CC
(5V/DIV)
INDUCTOR
CURRENT
(500mA/DIV)
2ms/DIV
31151 TA06c
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