Datasheet
Table Of Contents
- Features
- Applications
- Description
- Typical Application
- Absolute Maximum Ratings
- Pin Configuration
- Order Information
- Electrical Characteristics
- Typical Performance Characteristics
- Pin Functions
- Block Diagram
- Operation
- Applications Information
- Typical Applications
- Package Description
- Revision History
- Typical Application
- Related Parts

LTC3112
32
3112fc
For more information www.linear.com/LTC3112
LINEAR TECHNOLOGY CORPORATION 2010
LT 0614 REV C • PRINTED IN USA
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900
●
FAX: (408) 434-0507
●
www.linear.com/LTC3112
relaTeD parTs
PART
NUMBER
DESCRIPTION COMMENTS
LTC3531 200mA Buck-Boost Synchronous DC/DC Converter V
IN
= 1.8V to 5.5V, V
OUT
= 3.3V, I
Q
= 16μA, I
SD
< 1μA , SOT23, DFN Package
LTC3129 15V, 200mA Synchronous Buck-Boost Converter V
IN
= 2.42V to 15V, V
OUT
= 1.4V to 15.75V, I
Q
= 1.3μA, I
SD
< 10nA , QFN and
MSOP Packages
LTC3533 2A (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
= 40μA, I
SD
< 1μA , DFN Package
LTC3113 3A Low Noise Synchronous Buck-Boost DC/DC Converter V
IN
or V
OUT
= 1.8V to 5.5V, I
Q
= 40µA, I
SD
< 1µA, DFN and TSSOP Packages
LTC3534 7V, 500mA Synchronous Buck-Boost DC/DC Converter V
IN
= 2.4V to 7V, V
OUT
= 1.8V to 7V, I
Q
= 25μA, I
SD
< 1μA , DFN, GN Package
LTC3538 800mA Synchronous Buck-Boost DC/DC Converter V
IN
= 2.4V to 5.5V, V
OUT
= 1.8V to 5.25V, I
Q
= 35μA, I
SD
< 5μA , DFN Package
LTC3440 600mA (I
OUT
), 2MHz Synchronous Buck-Boost DC/DC
Converter
V
IN
= 2.5V to 5.5V, V
OUT
= 2.5V to 5.25V, I
Q
= 25μA, I
SD
< 1μA , MSOP and
DFN Packages
LTC3441 1.2A (I
OUT
), 1MHz Synchronous Buck-Boost DC/DC
Converter
V
IN
= 2.4V to 5.5V, V
OUT
= 2.4V to 5.25V, I
Q
= 25μA, I
SD
< 1μA , DFN Package
LTC3442 1.2A (I
OUT
), 2MHz Synchronous Buck-Boost DC/DC
Converter with Programmable Burst Mode Operation
V
IN
= 2.4V to 5.5V, V
OUT
= 2.4V to 5.25V, I
Q
= 35μA, I
SD
< 1μA , DFN Package
LTC3443 High Current Micropower 600kHz Synchronous Buck-Boost
DC/DC Converter
V
IN
= 2.4V to 5.5V, V
OUT
= 1.5V to 5.25V, I
Q
= 28μA, I
SD
< 1μA , DFN Package
LTC3115-1 2A (I
OUT
), 40V Synchronous Buck-Boost DC/DC Converter V
IN
= 2.7V to 40V, V
OUT
= 2.7V to 40V, I
Q
= 30µA, I
SD
< 3μA , DFN and TSSOP
Packages
LTC3780 High Efficiency, Synchronous, 4-Switch Buck-Boost
Converter
V
IN
= 4V to 36V, V
OUT
= 0.8V to 30V, I
Q
= 1500μA, I
SD
< 55μA , QFN Package
LTC3785 10V, High Efficiency, 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
LTC3101 Wide V
IN
, Multi-Output DC/DC Converter and PowerPath™
Controller
V
IN
= 1.8V to 5.5V, V
OUT
= 1.5V to 5.25V, I
Q
= 38μA, I
SD
< 15μA , QFN Package
LTC3522 Synchronous 400mA Buck-Boost and 200mA Buck V
IN
= 2.4V to 5.5V, V
OUT
= 2.2V to 5.25V, I
Q
= 25μA, I
SD
< 1μA , QFN Package
LTC3530 Wide Input Voltage Synchronous Buck-Boost DC/DC
Converter
V
IN
= 1.8V to 5.5V, V
OUT
= 1.8V to 5.25V, I
Q
= 40μA, I
SD
< 1μA , DFN Package
Typical applicaTion
0.1µF
3300pF
V
IN
5V TO 15V
6.8µH
0.1µF
200k
2210k
158k
22µF
68.1k
3300pF
68.1k
V
DAC
SW1
BST1
V
IN
V
CC
RUN
GND
PWMSYNC
SW2
BST2
V
OUT
COMP
I
OUT
OVP
FB
LTC3112
V
OUT
22µF
1µF
3112 TA07
47pF
DAC PROGRAMS LED CURRENT
1.0A AT 0V, 500mA AT 0.8V
I
OUT
= (1-0.625 • V
DAC
)A
OPEN LAMP AT 12V
VF = 3.6V
PER LED
AT 1A
10W, 10V High Intensity LED Driver with Programmable Current and Low-Loss Sensing
3112 TA08a
V
IN
(V)
4
LED CURRENT (mA)
1500
1000
1250
500
750
0
250
8 12 14106
V
DAC
= 0V
V
DAC
= 0.8V
LED Current vs V
IN
and DAC Voltage