LTC3118_15 Datasheet, PDF (38/38 Pages) Linear Technology – 18V, 2A Buck-Boost DC/DC Converter with Low-Loss Dual Input PowerPath

LTC3118
Typical Application
12V V_IN to 5V V_OUT Converter with Capacitor Backup
Runs from V_IN1 (Priority) in Normal Mode, V_IN2 During Backup Event
3.3µH
0.1µF
10.5V TO 14.5V
+
768k
BST1 SW1
V_IN1
LEAD ACID
BATTERY OR 12V
SYSTEM POWER
22µF
RUN1
100k
PGND
0.1µF
SW2 BST2
V_OUT
FB
GND
47nF
47nF
18V MAX, RUNS
DOWN TO 2.2V
+
CAPACITOR
BACKUP
10mF
CM1
CM2
CP1
CP2
10nF
10nF
CN2
CN1
V_IN2
2M
RUN2
22µF
LTC3118
VC
V1GD
V2GD
PGD
V_CC
SEL
MODE
10mF, 18V Back-Up Capacitor Supports
200mA Load for >1 Second
5V
402k
47µF
100k ^PGND
22pF
40.2k
1.8nF
V_CC BACK FED
FROM V_OUT
FOR LOW V_IN
OPERATION
POWER GOOD
INDICATORS
BAT-54
SCHOTTKY DIODE
V_IN2
10V/DIV
V_IN1
10V/DIV
V_OUT
5V/DIV
INDUCTOR
CURRENT
1A/DIV
200ms/DIV
3118 TA05b
4.7µF
PGND
40.2k
40.2k
3118 TA05a
CAN’T RUN FROM V_IN2 UNTIL V_OUT STARTS UP
Related Parts
PART NUMBER DESCRIPTION
COMMENTS
LTC3111
1.5A (I_OUT), 15V Synchronous Buck-Boost DC/DC Converter
V_IN = 2.5V to 15V, V_OUT = 2.5V to 15V, I_Q = 49µA, I_SD < 1µA,
DFN and MSOP Packages
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), 5V Synchronous Buck-Boost DC/DC Converter
V_IN = 1.8V to 5.5V, V_OUT = 1.8V to 5.25V, I_Q = 30μA, I_SD < 1μA,
DFN and TSSOP Packages
LTC3114-1 1A (I_OUT), 40V Synchronous Buck-Boost DC/DC Converter
V_IN = 2.2V to 40V, V_OUT = 2.7V to 15V, I_Q = 30µA, I_SD < 3µA,
DFN and TSSOP Packages
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
LTC3122
LTC3124
2.5A I_SW, 3MHz, Synchronous Step-Up DC/DC Converter with Operating Range V_IN = 1.8V to 5.5V (500mV After Start-Up), V_OUT = Up
Output Disconnect, Burst Mode Operation, Up to 95% Efficiency to 15V, I_Q = 25μA, I_SD <1µA, 3mm × 4mm DFN and MSOP Packages
5A I_SW, 3MHz, 2-Phase Synchronous Step-Up DC/DC
Converter, Output Disconnect, Burst Mode Operation,
Up to 95% Efficiency
Operating Range V_IN = 1.8V to 5.5V (500mV After Start-Up), V_OUT Up
to 15V, I_Q = 25µA, I_SD < 1µA, 3mm × 5mm DFN and TSSOP Packages
LTC3129
200mA (I_OUT), 15V Synchronous Buck-Boost DC/DC Converter V_IN = 2.42V to 15V, V_OUT = 2.5V to 14V, I_Q = 1.3μA, I_SD = 10nA,
QFN and MSOP Packages
LTC4412
LTC4417
28V Low Loss PowerPath Controller in ThinSOT™
Prioritized PowerPath Controller
Operating Range 3V to 36V, I_Q = 11µA, 6-Lead ThinSOT Package
V_IN = 2.5V to 36V, –42V Reverse Protection, I_Q = 28µA, I_SD < 1µA,
QFN and SSOP Packages
38 Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 950_Fo3_r5_m-7_o4_re1_i7_{nformation www.linear.com/LTC3118}
[phone] ^● FAX: [phone] ^● www.linear.com/LTC3118
3118f
LT 0215 • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 2015