LTC3115-2_15 Datasheet, PDF (42/42 Pages) Linear Technology – 40V, 2A Synchronous Buck-Boost DC/DC Converter

LTC3115-2
Typical Application
2MHz Automotive 5V Regulator with Cold Crank Capability
C_BST1
0.1µF
L1
3.3µH
C_BST2
0.1µF
AUTOMOTIVE
4V TO 40V
C_IN
4.7µF
BURST PWM
OFF ON
BST1 SW1
SW2 BST2
PV_IN
V_IN
PV_OUT
LTC3115-2
PWM/SYNC
RUN
VC
C_O
47µF × 2
R_FB
C_FB
4700pF
24.3k
100k
R_TOP
100k
C_FF
100pF
R_FF
2k
C_O: MURATA GRM43ER61A476
L1: COILCRAFT LPS5030-332ML
RT
R_T
17.8k
GND
FB
PGND
PV_CC
V_CC
1000pF
C1
4.7µF
31152 TA08a
R_BOT
24.9k
5V
800mA
Cold Crank Line Transient
with 800mA Load
V_IN
(2V/DIV)
V_OUT
(200mV/DIV)
INDUCTOR
CURRENT
(1A/DIV)
12V
15ms FALL TIME
6V
4.5V
200ms/DIV
31152 TA08b
Fast (10µs) Load Dump Line
Transient, V_IN = 13.8V to 36V
36V
INPUT VOLTAGE
(10V/DIV)
13.8V
V_OUT
(200mV/DIV)
200µs/DIV
31152 TA08c
Fast (10µs) Cold Crank Line
Transient, V_IN = 13.8V to 4V
13.8V
INPUT VOLTAGE
(5V/DIV)
4V
V_OUT
(200mV/DIV)
200µs/DIV
31152 TA08d
Related Parts
PART NUMBER DESCRIPTION
LTC3115-1
2A (I_OUT), 40V Synchronous Buck-Boost Converter
LTC3114-1
1A (I_OUT), 40V Synchronous Buck-Boost DC/DC Converter
LTC3112
2.5A (I_OUT), 15V Synchronous Buck-Boost DC/DC Converter
LTC3113
3A (I_OUT), 2MHz Synchronous Buck-Boost DC/DC Converter
LTC3127
LTC3789
1A (I_OUT), 1.2MHz Buck-Boost DC/DC Converter with
Programmable Input Current Limit
High Efficiency, Synchronous, 4-Switch Buck-Boost Controller
LTC3785
LTC3534
≤10A (I_OUT), High Efficiency, 1MHz Synchronous, No R_SENSE™
Buck-Boost Controller
7V, 500mA (I_OUT), 1MHz Synchronous Buck-Boost DC/DC
Converter
COMMENTS
V_IN: 2.7V to 40V, V_OUT : 2.7V to 40V, I_Q = 30µA, I_SD < 3µA, DFN and
TSSOP Packages
V_IN = 2.2V to 40V, V_OUT = 2.7V to 40V, I_Q = 30µA, I_SD < 3µA, DFN
and TSSOP Packages
V_IN: 2.7V to 15V, V_OUT : 2.5V to 14V, I_Q = 40µA, I_SD < 1µA, DFN and
TSSOP Packages
V_IN: 1.8V to 5.5V, V_OUT : 1.8V to 5.25V, I_Q = 30µA, ISD < 1µA, DFN
and TSSOP Packages
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
V_IN: 4V to 38V, V_OUT : 0.8V to 38V, I_Q = 3mA, I_SD < 60µA,
SSOP-28, QFN-28 Packages
V_IN: 2.7V to 10V, V_OUT : 2.7V to 10V, I_Q = 86µA, I_SD < 15µA,
QFN Package
94% Efficiency, V_IN: 2.4V to 7V, V_OUT : 1.8V to 7V, I_Q = 25µA,
I_SD < 1µA, DFN and GN Packages
31152fa
42 Linear Technology Corporation
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LT 0615 REV A • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2013