LTC3113 Datasheet PDF - Linear Technology Corporation


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LTC3113
Linear Technology Corporation

Part Number LTC3113
Description 3A Low Noise Buck-Boost DC/DC Converter
Page 24 Pages

LTC3113 datasheet pdf
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LTC3113
3A Low Noise Buck-Boost
DC/DC Converter
FEATURES
n Regulated Output with Input Voltage Above, Below
or Equal to the Output Voltage
n 1.8V to 5.5V Input and Output Voltage Range
n 3A Continuous Output Current VIN > 3.0V, VOUT = 3.8V
n 1.5A Continuous Output Current for VIN ≥ 1.8V,
VOUT = 3.3V
n Single Inductor
n Low Noise Buck-Boost Architecture
n Up to 96% Efficiency
n Programmable Frequency from 300kHz to 2MHz
n Selectable Burst Mode® Operation
n Output Disconnect in Shutdown
n Shutdown Current: <1μA
n Internal Soft-Start
n Small, Thermally Enhanced 16-Lead
(4mm × 5mm × 0.75mm) DFN Package
and 20-Lead TSSOP Package
APPLICATIONS
n Wireless Modems
n Backup Power Systems
n Portable Inventory Terminals
n Portable Barcode Readers
n Portable Instrumentation
DESCRIPTION
The LTC®3113 is a wide VIN range, highly efficient, fixed
frequency, buck-boost DC/DC converter that operates
from input voltages above, below or equal to the output
voltage. The topology incorporated in the IC provides low
noise operation, making it well suited for RF and precision
measurement applications.
The LTC3113 can deliver up to 3A of continuous output
current to satisfy the most demanding applications.
Higher output current is possible in stepdown (buck)
mode. Integrated low RDS(ON) power MOSFETs and a
programmable switching frequency up to 2MHz result
in a compact solution footprint. Selectable Burst Mode
operation improves efficiency at light loads.
Other features include <1μA shutdown current, integrated
soft-start, short-circuit protection, current limit and ther-
mal overload protection. The LTC3113 is housed in the
thermally enhanced 16-lead (4mm × 5mm × 0.75mm)
DFN and 20-lead TSSOP packages.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and No RSENSE, PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
Li-Ion to 3.8V/3A
2.2μH
VIN
3V TO 4.2V
47μF
OFF ON
PWM BURST
90.9k
SW1 SW2
VIN VOUT
LTC3113
RUN FB
BURST
VC
RT
SGND
PGND
49.9k
680pF
12pF
845k 6.49k
47pF
158k
3113 TA01a
VOUT
3.8V
100μF 3A
Efficiency vs Input Voltage
100
VOUT = 3.8V
95
90
ILOAD = 1A
85 ILOAD = 3A
80
75
70
65
60
55
50
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
3113 TA01b
3113f
1
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LTC3113
ABSOLUTE MAXIMUM RATINGS (Notes 1, 3)
VIN, VOUT, SW1, SW2 Voltage (DC).............. –0.3V to 6V
SW1, SW2 Voltage, Pulsed (<100ns) (Note 4)............7V
VC, RUN, BURST Voltage............................. –0.3V to 6V
FB ................................................................–0.3V to VIN
RT Voltage.................................................... –0.3V to 1V
Operating Junction Temperature Range
(Notes 2, 5)............................................ –40°C to 125°C
Maximum Junction Temperature........................... 125°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP .............................................................. 300°C
PIN CONFIGURATION
TOP VIEW
VOUT
VOUT
VIN
VIN
VIN
SGND
1
2
3
4
5
6
BURST 7
RT 8
17
PGND
16 SW2
15 SW2
14 SW1
13 SW1
12 SW1
11 RUN
10 FB
9 VC
DHD PACKAGE
16-LEAD (5mm s 4mm) PLASTIC DFN
TJMAX = 125°C, θJA = 36.5°C/W, θJC = 3.6°C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
PGND 1
VOUT
VOUT
VIN
VIN
VIN
SGND
2
3
4
5
6
7
BURST 8
RT 9
PGND 10
21
PGND
20 PGND
19 SW2
18 SW2
17 SW1
16 SW1
15 SW1
14 RUN
13 FB
12 VC
11 PGND
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 125°C, θJA = 31.5°C/W, θJC = 4.1°C/W
EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3113EDHD#PBF
LTC3113EDHD#TRPBF 3113
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3113IDHD#PBF
LTC3113IDHD#TRPBF 3113
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3113EFE#PBF
LTC3113EFE#TRPBF
LTC3113FE
20-Lead Plastic TSSOP
–40°C to 125°C
LTC3113IFE#PBF
LTC3113IFE#TRPBF
LTC3113FE
20-Lead Plastic TSSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
2
3113f
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LTC3113
ELECTRICAL CHARACTERISTICS The l denotes specifications which apply over the full junction temperature
range, otherwise specifications are at TA = 25°C (Note 2). VIN = 3.3V, VOUT = 3.8V unless otherwise noted.
PARAMETER
CONDITION
MIN TYP MAX UNITS
Input Operating Range
l 1.8
5.5 V
Output Voltage Adjust Range
l 1.8
5.5 V
Feedback Voltage
Feedback Input Current
Quiescent Current–Burst Mode Operation
VBURST = 0V
VFB = 0.7V
VBURST = 3.3V
l 588 600 612
0 50
40 55
mV
nA
μA
Quiescent Current–Shutdown
Quiescent Current–Active
Input Current Limit
VOUT = 0V, VRUN = 0V, Not Including Switch Leakage
0.1 1
VFB = 0.7V, VBURST = 0V, RT = 90.9k
300 500
l 5.8 7.8 9.8
μA
μA
A
Peak Current Limit
6.5 11.1 16.0
A
Burst Mode Peak Current Limit
0.9 1.9 2.9
A
Reverse Current Limit
–1.6 –1 –0.4
A
NMOS Switch Leakage
Switch B, SW1 = 5.5V, VIN = 5.5V, VOUT = 5.5V
Switch C, SW2 = 5.5V, VIN = 5.5V, VOUT = 5.5V
0.01 10
0.01 10
μA
μA
PMOS Switch Leakage
Switch A, VIN = 5.5V, VOUT = 5.5V, SW1 = 0V
Switch D, VIN = 5.5V, VOUT = 5.5V, SW2 = 0V
0.01 20
0.01 20
μA
μA
NMOS Switch On-Resistance
PMOS Switch On-Resistance
Maximum Duty Cycle
Switch B, VOUT = 3.8V
Switch C, VOUT = 3.8V
Switch A, VIN = 3.3V
Switch D, VOUT = 3.8V
Boost (% Switch C On)
Buck (% Switch A On)
l 80
l 100
25
35
30
40
90
%
%
Minimum Duty Cycle
l 0%
Frequency Accuracy
Error Amp AVOL
RT = 90.9k
l 0.8 1 1.2
100
MHz
dB
Error Amp Source Current
Error Amp Sink Current
BURST Input Logic Threshold
VC = 0V, VFB = 0V
VC = 1.2V, VFB = 0.7V
500
160
l 0.3 0.7 1.2
μA
μA
V
BURST Input Current
RUN Input Logic Threshold
VBURST = 5.5V
01
l 0.3 0.7 1.2
μA
V
RUN Input Current
Soft-Start Time
VRUN = 5.5V
01
2
μA
ms
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC3113 is tested under pulsed load conditions such that
TJ ≈ TA. The LTC3113E is guaranteed to meet performance specifications
from 0°C to 85°C junction temperature. Specifications over the
–40°C to 125°C operating temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3113I is guaranteed to meet performance specifications over the
–40°C to 125°C operating junction temperature range.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when the protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: Voltage transients on the switch pins beyond the DC limit specified
in the absolute maximum ratings are non-disruptive to normal operation
when using good layout practices, as shown on the demo board or
described in the data sheet and application notes.
Note 5: The junction temperature (TJ in °C) is calculated from the ambient
temperature (TA in °C) and the power dissipation (PD in Watts) as follows:
TJ = TA + (PD) • (θJA°C/W)
3113f
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LTC3113
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C, VIN = 3.3V, VOUT = 3.8V unless otherwise specified)
Efficiency 3.3V ±10% to 3.8V
100
Efficiency 1.8V, 3.6V, 5.5V to 3.8V
100
90 90
80 80
70
60
50
0.001
VIN = 2.97V
VIN = 3.3V
VIN = 3.63V
VIN = 2.97V BURST
VIN = 3.3V BURST
VIN = 3.63V BURST
0.01 0.1
1
LOAD CURRENT (A)
10
3113 G01
Burst Mode No-Load Input
Current vs Temperature
60
50
40
30
20
10
0
–45 –25 –5 15 35 55 75 95 115
TEMPERATURE (°C)
3113 G04
Normalized N-Channel Switch
Resistance vs VIN
1.6
1.5
1.4
1.3 T = 125°C
1.2
1.1
T = 25°C
1.0
0.9 T = –40°C
0.8
0.7
0.6
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
3113 G07
70
60
50
0.001
VIN = 1.8V
VIN = 3.6V
VIN = 5.5V
VIN = 1.8V BURST
VIN = 3.6V BURST
VIN = 5.5V BURST
0.01 0.1
1
LOAD CURRENT (A)
10
3113 G02
PWM Mode No-Load Input
Current vs VIN
60
50
VOUT = 5.5V
40
30
VOUT = 3.8V
20
10
VOUT = 1.8V
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3113 G05
Feedback Voltage
vs Temperature
0.601
0.600
0.599
0.598
0.597
0.596
0.595
–45 –25 –5 15 35 55 75 95 115
TEMPERATATURE (°C)
3113 G08
4
Burst Mode No-Load Input
Current vs VIN
100
90
VOUT = 5.5V
80
70 VOUT = 3.8V
60
50
40 VOUT = 1.8V
30
20
10
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3113 G03
Normalized P-Channel Switch
Resistance vs VIN
1.4
1.3
1.2 T = 125°C
1.1
T = 25°C
1.0
0.9 T = –40°C
0.8
0.7
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
VIN (V)
3113 G06
Maximum Load Current in PWM
Mode vsVIN (Input Current limit 5.8A)
6
5
4
3
2
1
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3113 G09
3113f
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