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PDF LTC3118 Data sheet ( Hoja de datos )
| Número de pieza | LTC3118 | |
| Descripción | 2A Buck-Boost DC/DC Converter | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC3118 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Features
nn Integrated High Efficiency Dual Input PowerPath™
Plus Buck-Boost DC/DC Converter
nn Ideal Diode or Priority VIN Select Modes
nn VIN1 and VIN2 Range: 2.2V to 18V
nn VOUT Range: 2V to 18V
nn Either VIN Can Be Above, Below or Equal to VOUT
nn Generates 5V at 2A for VIN > 6V
nn 1.2MHz Low Noise Fixed Frequency Operation
nn Current Mode Control
nn All Internal N-Channel MOSFETs
nn Pin-Selectable PWM or Burst Mode® Operation
nn Accurate, Independent RUN Pin Thresholds
nn Up to 94% Efficiency
nn VIN and VOUT Power Good Indicators
nn IQ of 50µA in Sleep, 2µA in Shutdown
nn 4mm × 5mm 24-Lead QFN or 28-Lead TSSOP Packages
Applications
nn Systems with Multiple Input Sources
nn Back Up Power Systems
nn Wall Adapter or Li-Ion(s) Input to 5VOUT
nn Battery or Super Capacitor Input for Reserve Power
nn Replace Diode-OR Designs with Higher Efficiency,
Flexibility and Performance
LTC3118
18V, 2A Buck-Boost DC/DC
Converter with Low-Loss
Dual Input PowerPath
Description
The LTC®3118 is a dual-input, wide voltage range syn-
chronous buck-boost DC/DC converter with an intelligent,
integrated, low-loss PowerPath control. The unique power
switch architecture provides efficient operation from either
input source to a programmable output voltage above,
below or equal to the input. Voltage capability of up to 18V
provides flexibility and voltage margin for a wide variety
of applications and power sources.
The LTC3118 uses a low noise, current mode architecture
with a fixed 1.2MHz PWM mode frequency that minimizes
the solution footprint. For high efficiency at light loads,
automatic Burst Mode operation can be selected consum-
ing only 50µA of quiescent current in sleep.
System level features include ideal diode or VIN priority
modes, VIN and VOUT power good indicators, accurate RUN
comparators to program independent UVLO thresholds,
and output disconnect in shutdown. Other features include
2µA shutdown current, short-circuit protection, soft-start,
current limit and thermal overload protection.
The LTC3118 is offered in thermally enhanced 24-lead
4mm × 5mm QFN and 28-lead TSSOP packages.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
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.
Typical Application
3.3µH
0.1µF
0.1µF
VIN1
22µF 47nF VIN1 BST1 SW1
SW2 BST2 VOUT
400k
CM1 FB
22pF
CP1
10nF
CN1
CN2
10nF
LTC3118
40.2k 1.8nF
VC
100k
CP2 V1GD
VIN2
VIN2
22µF
V2GD
PGD
MODE
INDICATORS
47nF
CM2
PGND VCC GND
SEL
RUN1
RUN2
CONTROL
SIGNALS
4.7µF
3118 TA01a
VOUT
5V
100µF
5VOUT
AC-COUPLED
500mV/DIV
Input Switchover Response
VIN1 = 5V, VIN2 = 12V, VOUT = 5V AT 1A
SW1
10V/DIV
SEL
5V/DIV SELECT VIN2
SELECT VIN1
100µs/DIV
3118 TA01b
For more information www.linear.com/LTC3118
3118f
1
1 page  
LTC3118
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
VLoOsUsT
= 5V, Efficiency
vs Load Current
and Power
from VIN1
100
90 BURST
5
80 4
70
60 3
50
PWM
40 2
30
20
10
3.6VIN
5VIN
12VIN
LOSS 1
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
1
0
10
3118 G04
VOUT = 3.3V Efficiency and Power
Loss vs Load Current from VIN1
100 5
90 BURST
80 4
70 2.7VIN
60
5VIN
12VIN
3
50
40 2
30
20 PWM 1
10 LOSS
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
1
0
10
3118 G07
Die Temperature Rise vs Load
LCTuCrr3e1n1t,8VDOeUmT o=
12V, 4-Layer
Board
100
90
80
70
60
50
40
30
20 VIN = 5V
10
VIN = 12V
VIN = 18V
0
0 0.5 1 1.5 2 2.5
LOAD CURRENT (A)
3118 G10
LVoOsUsT
= 5V, Efficiency
vs Load Current
and Power
from VIN2
100 5
90 BURST
80 4
70
60
PWM
3
50
40 2
30
20
10
3.6VIN
5VIN
12VIN
LOSS 1
0
0.0001
0.001 0.01 0.1
LOAD CURRENT (A)
1
0
10
3118 G05
VOUT = 3.3V Efficiency and Power
Loss vs Load Current from VIN2
100 5
90 BURST
80 4
70
60 3
50
40
2.7VIN
5VIN
12VIN
2
30
20
10
0
0.0001
PWM
0.001 0.01 0.1
LOAD CURRENT (A)
1
LOSS
0
1 10
3118 G08
Die Temperature Rise vs Load
LCTuCrr3e1n1t,8VDOeUmT o=
5V, 4-Layer
Board
100
90
80
70
60
50
40
30
20 VIN = 3.6V
10
VIN = 5V
VIN = 12V
0
0 0.5 1 1.5 2 2.5
LOAD CURRENT (A)
3118 G11
V5VolOtUaTgeEfwfiictihen5c0y0mvsAVaINn1do1rAVLINo2ad
Current
100
95
90
85
80
VIN1, LOAD = 500mA
75
VIN2, LOAD = 500mA
VIN1, LOAD = 1A
VIN2, LOAD = 1A
70
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
3118 G06
V3.o3ltVaOgUeTwEiftfhici5e0n0cmy AvsaVndIN11AorLVoIaNd2
Current
100
95
90
85
80
VIN1, LOAD = 500mA
75
VIN2, LOAD = 500mA
VIN1, LOAD = 1A
VIN2, LOAD = 1A
70
2 4 6 8 10 12 14 16 18
INPUT VOLTAGE (V)
3118 G09
Die Temperature Rise vs Load
CLTuCrr3e1n1t,8VDOeUmT o=
3.3V,
Board
4-Layer
100
90
80
70
60
50
40
30
20 VIN = 2.7V
10 VIN = 5V
0 VIN = 12V
0 0.5 1 1.5 2 2.5
LOAD CURRENT (A)
3118 G12
For more information www.linear.com/LTC3118
3118f
5
5 Page 
Block Diagram
LTC3118
VIN1 2.2V TO 18V
VIN2 2.2V TO 18V
L
VOUT 2V TO 18V
VIN2 VIN1
VCC
BST1
CM2
A FETs
AND DRIVERS
CM1
SW1
SW2 VOUT
BST2
VCC
CP1 CP2
PGND
VCC
BDRV
ISWA
ISWB
B
D DDRV
VCC
C CDRV
CP2 VIN2
VCC SEL2
CN2 PMP2
CLK
–200mA
ADRV BDRV
CDRV DDRV
DRIVERS
VIN1 +
–
ISENSE
CP1 VIN1 ISWA
VCC SEL1
ISWB
CN1 PMP1
CLK
ISENSE
+
–IREV
+
6A –IPEAK
SWITCH
COMMANDS
BURST
UVLO
RUN
VIN2
2V
+ 2.35V
– VCC
+
–
GND
ISENSE
RCS
AVERAGE
CURRENT
AMPLIFIER
gm
1V
FB
1.2MHz RAMPS/
OSCILLATOR
SOFT-START
RAMP
VC
PWM
COMPARATOR
VIN1
VIN2
3.8V REGULATOR
1.22V REFERENCE
VCC
FB
0.92V
+
–
PGD
V1GD
VSELECT
VIN1GOOD
VIN1GOO2
IDEAL DIODE
MODE
VIN1GOOD V1PRIORITY
MODE
VIN2GOOD
RUN/SD
+
–
+
–
V2GD
SEL
RUN1
RUN2
1.22V
MODE
R1
COUT
R2
UP TO 18V
3118 BD
For more information www.linear.com/LTC3118
3118f
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3118.PDF ] | |
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