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PDF LTC3113 Data sheet ( Hoja de datos )
| Número de pieza | LTC3113 | |
| Descripción | 3A Low Noise Buck-Boost DC/DC Converter | |
| Fabricantes | Linear Technology Corporation | |
| Logotipo |  |
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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
TYPICAL PERFORMANCE CHARACTERISTICS
(TA = 25°C, VIN = 3.3V, VOUT = 3.8V unless otherwise specified)
Maximum Load Current in Burst
Mode Operation vs VIN (Burst
Mode Peak Current Limit 0.9A)
300
250
200
150
Output Voltage Regulation
vs Load Current
PWM MODE
0
Burst Mode
OPERATION
–0.2
–0.4
100 –0.6
50 –0.8
Load Step, 0A to 3A
VOUT
200mV/DIV
ILOAD
2A/DIV
100μs/DIV
BACK PAGE TYPICAL APPLICATION
3113 G12
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
VIN (V)
3113 G10
–1.0
0.0001 0.001 0.01
0.1
LOAD CURRENT (A)
1 10
3113 G11
Output Voltage Ripple in Burst
Mode Operation
VOUT
20mV/DIV
INDUCTOR
CURRENT
1A/DIV
20μs/DIV
ILOAD = 50mA
FRONT PAGE TYPICAL APPLICATION
3113 G14
Output Voltage Ripple in
PWM Mode
VOUT
20mV/DIV
VOUT
20mV/DIV
VOUT
20mV/DIV
ILOAD = 1A
VIN = 3.3V
VIN = 4V
VIN = 4.55V
1μs/DIV
Burst to PWM Mode Transient
VOUT
50mV/DIV
3113 G14
BURST
2V/DIV
ILOAD = 50mA 500μs/DIV
FRONT PAGE TYPICAL APPLICATION
3113 G15
Soft-Start
Normalized Input Current Limit
vs Temperature (7.8A Typical)
1.10
Normalized Peak Current Limit
vs Temperature (11.1A Typical)
1.10
VOUT
2V/DIV
1.05
1.05
RUN
5V/DIV
VIN = 3.3V
VOUT = 3.8V
COUT = 100μF
500μs/DIV
3113 G16
1.00
0.95
0.90
–45 –25 –5 15 35 55 75 95 115
TEMPERATURE (°C)
3113 G17
1.00
0.95
0.90
–45 –25 –5 15 35 55 75
TEMPERATURE (°C)
95 115
3113 G18
3113f
5
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LTC3113
OPERATION
AC phase will eventually increase to the point that there is
no longer any BD phase. At this point, switch A remains on
continuously while switch pair CD is pulse width modu-
lated to obtain the desired output voltage. At this point,
the converter is operating solely in boost mode.
This switching algorithm provides a seamless transition
between operating modes and eliminates discontinuities
in average inductor current, inductor current ripple, and
loop transfer function throughout all three operational
modes. These advantages result in increased efficiency
and stability in comparison to the traditional four-switch
buck-boost converters.
Burst Mode Operation
With the BURST pin held high, the buck-boost converter
operates utilizing a variable frequency switching algorithm
designed to improve efficiency at light load and reduce
the standby current at zero load. In Burst Mode operation,
the inductor is charged with fixed peak amplitude current
pulses and as a result only a fraction of the maximum
output current can be delivered when in this mode.
These current pulses are repeated as often as necessary
to maintain the output regulation voltage. The maximum
output current, IMAX, which can be supplied in Burst Mode
operation is dependent upon the input and output voltage
as given by the following formula:
( )IMAX
≅ IPK
2
•
VIN
VIN + VOUT
•η
A
where IPK is the Burst Mode peak current limit in amps
and is the η efficiency.
If the buck-boost load exceeds the maximum Burst Mode
current capability, the output rail will lose regulation. In
Burst Mode operation, the error amplifier is configured
in a low power mode of operation and used to hold the
compensation pin, VC, to reduce transients that may oc-
cur during transitions from Burst Mode to PWM mode
operation.
3113f
11
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| Páginas | Total 24 Páginas | |
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