Datasheet

LTC3115-1
42
31151fa
For more information www.linear.com/LTC3115-1
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0413 REV A • PRINTED IN USA
[phone]
●
FAX: [phone]
●
www.linear.com/LTC3115-1
relaTeD parTs
Typical applicaTion
750kHz Automotive 5V Regulator with Cold Crank Capability
Cold Crank Line Transient with 1A Load Load Dump Line Transient with 1A Load
Efficiency vs Load Current
V
IN
= 12V
BST1 BST2
PV
IN
V
IN
RUN
PWM/SYNC
PV
OUT
VC
FB
PV
CC
V
CC
RT
SW1 SW2
GND PGND
LTC3115-1
L1
6.8µH
C
BST1
0.1µF
C
BST2
0.1µF
AUTOMOTIVE
3.6V TO 40V
C
FF
33pF
C1
4.7µF
5V
1A
C
IN
10µF
C
O
47µF
R
TOP
1M
R
BOT
249k
D1*
C
IN
: MURATA GRM55DR61H106K
C
O
: MURATA GRM43ER60J476K
D1: PANASONIC MA785
L1: SUMIDA CDRH8D43HPNP
*OPTIONAL-INSTALL D1 FOR IMPROVED EFFICIENCY AND LOWER INPUT OPERATING VOLTAGE
31151 TA08a
R
T
47.5k
R
FF
42.2k
R
FB
54.9k
C
FB
1000pF
BURST PWM
OFF ON
PART NUMBER DESCRIPTION COMMENTS
LTC3112 2.5A (I
OUT
), 15V Synchronous Buck-Boost DC/DC Converter V
IN
: 2.7V to 15V, V
OUT
: 2.5V to 14V, I
Q
= 40µA, I
SD
< 1µA, DFN and
TSSOP Packages
LTC3113 3A (I
OUT
), 2MHz Synchronous Buck-Boost DC/DC Converter V
IN
: 1.8V to 5.5V, V
OUT
: 1.8V to 5.25V, I
Q
= 30µA, ISD < 1µA, DFN
and TSSOP Packages
LTC3127 1A (I
OUT
), 1.2MHz Buck-Boost DC/DC Converter with
Programmable Input Current Limit
96% Efficiency V
IN
: 1.8V to 5.5V, V
OUT
: 1.8V to 5.25V, I
Q
= 35µA,
I
SD
< 4µA, MSOP and DFN Packages
LTC3789 High Efficiency, Synchronous, 4-Switch Buck-Boost Controller V
IN
: 4V to 38V, V
OUT
: 0.8V to 38V, I
Q
= 3mA, I
SD
< 60µA,
SSOP-28, QFN-28 Packages
LTC3785 ≤10A (I
OUT
), High Efficiency, 1MHz Synchronous, No R
SENSE
™
Buck-Boost Controller
V
IN
: 2.7V to 10V, V
OUT
: 2.7V to 10V, I
Q
= 86µA, I
SD
< 15µA,
QFN Package
LTC3534 7V
, 500mA (I
OUT
), 1MHz Synchronous Buck-Boost DC/DC
Converter
94% Efficiency, V
IN
: 2.4V to 7V, V
OUT
: 1.8V to 7V, I
Q
= 25µA,
I
SD
< 1µA, DFN and GN Packages
V
IN
(2V/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
200ms/DIV
31151 TA08b
12V
6V
15ms FALL TIME
4.5V
V
IN
(10V/DIV)
V
OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
2ms/DIV
31151 TA08c
40V
13.8V
LOAD CURRENT (A)
0.01
60
EFFICIENCY (%)
80
100
0.1 1
31151 TA08d
40
50
70
90
30
20
WITH BOOTSTRAP DIODE
WITHOUT BOOTSTRAP DIODE