LTC3118
18V, 2A Buck-Boost DC/DC
Converter with Low Loss
Dual Input PowerPath
Fea T Descrip T
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Integrated High Efficiency Dual Input PowerPath The LTC 3118 is a dual-input, wide voltage range syn-
Plus Buck-Boost DC/DC Converter chronous buck-boost DC/DC converter with an intelligent,
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integrated, low loss PowerPath control. The unique power
Ideal Diode or Priority V Select Modes
IN
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switch architecture provides efficient operation from either
V and V Range: 2.2V to 18V
IN1 IN2
n input source to a programmable output voltage above,
V Range: 2V to 18V
OUT
n below or equal to the input. Voltage capability of up to 18V
Either V Can Be Above, Below or Equal to V
IN OUT
n provides flexibility and voltage margin for a wide variety
Generates 5V at 2A for V > 6V
IN
of applications and power sources.
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1.2MHz Low Noise Fixed Frequency Operation
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Current Mode Control
The LTC3118 uses a low noise, current mode architecture
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All Internal N-Channel MOSFETs
with a fixed 1.2MHz PWM mode frequency that minimizes
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Pin-Selectable PWM or Burst Mode Operation
the solution footprint. For high efficiency at light loads,
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Accurate, Independent RUN Pin Thresholds
automatic Burst Mode operation can be selected consum-
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Up to 94% Efficiency
ing only 50A of quiescent current in sleep.
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V and V Power Good Indicators
IN OUT
System level features include ideal diode or V priority
IN
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I of 50A in Sleep, 2A in Shutdown
Q
modes, V and V power good indicators, accurate RUN
IN OUT
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4mm 5mm 24-Lead QFN or 28-Lead TSSOP Packages
comparators to program independent UVLO thresholds,
and output disconnect in shutdown. Other features include
a T
2A shutdown current, short-circuit protection, soft-start,
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Systems with Multiple Input Sources
current limit and thermal overload protection.
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Back Up Power Systems
The LTC3118 is offered in thermally enhanced 24-lead
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Wall Adapter or Li-Ion(s) Input to 5V
OUT
4mm 5mm QFN and 28-lead TSSOP packages.
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Battery or Super Capacitor Input for Reserve Power
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
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Replace Diode-OR Designs with Higher Efficiency,
and PowerPath and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners. Protected by U.S. Patents, including 7709976.
Flexibility and Performance
Typical a T
3.3H
Input Switchover Response
0.1F 0.1F
V
OUT
V
IN1
V BST1 SW1 SW2 BST2 V
IN1 OUT
5V
V = 5V, V = 12V, V = 5V AT 1A
IN1 IN2 OUT
47nF
22F
400k
5V
OUT
100F
CM1
AC-COUPLED
FB
500mV/DIV
22pF
CP1
100k
10nF
1.8nF
SW1
CN1
40.2k
LTC3118
10V/DIV
CN2
VC
10nF
CP2
V1GD SEL
SELECT V SELECT V
V2GD INDICATORS 5V/DIV IN2 IN1
V
IN2 V
IN2
PGD
22F
MODE
3118 TA01b
CM2 SEL CONTROL
100s/DIV
SIGNALS
RUN1
47nF
PGND V GND RUN2
CC
3118 TA01a
4.7F
3118fa
1
For more information www.linear.com/LTC3118
ion pplica
ions pplica
ion uresLTC3118
a T e Maxi Mu M r a T (Note 1)
V , V Voltage ....................................... 0.3V to 20V CP1 Voltage ........................ (V 0.3V) to (V + 6V)
IN1 IN2 IN1 IN1
V Voltage .............................................. 0.3V to 20V CP2 Voltage ........................ (V 0.3V) to (V + 6V)
OUT IN2 IN2
SW1 DC Voltage (Note 4) ...............0.3V to (V + 0.3V) V , CN1, CN2 Voltage ................................... 0.3 to 6V
IN1 CC
or (V + 0.3V) MODE, SEL, FB, VC Voltage ........................... 0.3 to 6V
IN2
SW2 DC Voltage (Note 4).............0.3V to (V + 0.3V) Operating Junction Temperature Range (Notes 2, 3)
OUT
BST1 Voltage .....................(SW1 0.3V) to (SW1 + 6V) LTC3118E/LTC3118I ........................... 40C to 125C
BST2 Voltage ....................(SW2 0.3V) to (SW2 + 6V) LTC3118H .......................................... 40C to 150C
RUN1, RUN2 Voltage .................................. 0.3V to 20V LTC3118MP ........................................ 55C to 150C
PGD, V1GD, V2GD Voltage ......................... 0.3V to 20V Storage Temperature Range .................. 65C to 150C
CM1, CM2 Voltage ....................................... 0.3 to 20V Lead Temperature (Soldering, 10 sec) TSSOP ......300C
p c F T
TOP VIEW
1 CM2
CM1 28
TOP VIEW
2 27 CN2
CN1
CP1 3 26 PGND
24 23 22 21 20
SEL 1 19 CP2
SEL 4 25 CP2
V 2 18 V
IN1 IN2 5 24 V
V
IN1 IN2
RUN1 3 17 SW1
RUN1 6 23 SW1
25
29
RUN2 4 16 BST1
PGND RUN2 7 22 BST1
PGND
V 5 15 BST2
CC
8 BST2
V 21
CC
MODE 6 14 SW2
9 20 SW2
MODE
GND 7 13 V
OUT
GND 10 19 V
OUT
8 9 10 11 12
11 PGND
GND 18
12 17 PGND
VC
UFD PACKAGE
FB 13 16 PGD
24-LEAD (4mm 5mm) PLASTIC QFN
V1GD 14 15 V2GD
T = 150C, = 3.4C/W, = 43C/W
JMAX JC JA
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
FE PACKAGE
28-LEAD PLASTIC TSSOP
T = 150C, = 5C/W, = 30C/W
JMAX JC JA
EXPOSED PAD (PIN 29) IS PGND, MUST BE SOLDERED TO PCB
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3118EUFD#PBF LTC3118EUFD#TRPBF 3118 24-Lead (4mm 5mm) Plastic QFN 40C to 125C
LTC3118IUFD#PBF LTC3118IUFD#TRPBF 3118 24-Lead (4mm 5mm) Plastic QFN 40C to 125C
LTC3118HUFD#PBF LTC3118HUFD#TRPBF 3118 24-Lead (4mm 5mm) Plastic QFN 40C to 150C
LTC3118MPUFD#PBF LTC3118MPUFD#TRPBF 3118 24-Lead (4mm 5mm) Plastic QFN 55C to 150C
LTC3118EFE#PBF LTC3118EFE#TRPBF 3118FE 28-Lead Plastic TSSOP 40C to 125C
LTC3118IFE#PBF LTC3118IFE#TRPBF 3118FE 28-Lead Plastic TSSOP 40C to 125C
LTC3118HFE#PBF LTC3118HFE#TRPBF 3118FE 28-Lead Plastic TSSOP 40C to 150C
LTC3118MPFE#PBF LTC3118MPFE#TRPBF 3118FE 28-Lead Plastic TSSOP 55C to 150C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
For more information on lead free part marking, go to: