|
|
PDF LTC3129-1 Data sheet ( Hoja de datos )
| Número de pieza | LTC3129-1 | |
| Descripción | 200mA Synchronous Buck-Boost DC/DC Converter | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC3129-1 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
LTC3129-1
15V, 200mA Synchronous
Buck-Boost DC/DC Converter
with 1.3µA Quiescent Current
Features
Description
n Regulates VOUT Above, Below or Equal to VIN
n Wide VIN Range: 2.42V to 15V, 1.92V to 15V After
Start-Up (Bootstrapped)
n Fixed Output Voltage with Eight User-Selectable
Settings from 2.5V to 15V
n 200mA Output Current in Buck Mode
n Single Inductor
n 1.3µA Quiescent Current
n Programmable Maximum Power Point Control
n 1.2MHz Ultralow Noise PWM
n Current Mode Control
n Pin Selectable Burst Mode® Operation
n Up to 95% Efficiency
n Accurate RUN Pin Threshold
n Power Good Indicator
n 10nA Shutdown Current
n Thermally Enhanced 3mm × 3mm QFN and
16-Lead MSOP Packages
Applications
n Industrial Wireless Sensor Nodes
n Post-Regulator for Harvested Energy
n Solar Panel Post-Regulator/Charger
n Intrinsically Safe Power Supplies
n Wireless Microphones
n Avionics-Grade Wireless Headsets
The LTC®3129-1 is a high efficiency, 200mA buck-boost
DC/DC converter with a wide VIN and VOUT range. It
includes an accurate RUN pin threshold to allow predict-
able regulator turn-on and a maximum power point control
(MPPC) capability that ensures maximum power extraction
from non-ideal power sources such as photovoltaic panels.
The LTC3129-1 employs an ultralow noise, 1.2MHz PWM
switching architecture that minimizes solution footprint by
allowing the use of tiny, low profile inductors and ceramic
capacitors. Built-in loop compensation and soft-start
simplify the design. For high efficiency operation at light
loads, automatic Burst Mode operation can be selected,
reducing the quiescent current to just 1.3µA. To further
reduce part count and improve light load efficiency, the
LTC3129-1 includes an internal voltage divider to provide
eight selectable fixed output voltages.
Additional features include a power good output, less than
10nA of shutdown current and thermal shutdown.
The LTC3129-1 is available in thermally enhanced
3mm × 3mm QFN and 16-lead MSOP packages. For an
adjustable output voltage, see the functionally equivalent
LTC3129.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
22nF 10µH 22nF
VIN
2.42V TO 15V
AA OR AAA
BATTERIES
10µF
VCC
BST1 SW1
VIN
SW2 BST2
VOUT
LTC3129-1
RUN
VOUT
5V AT
10µF
100mA VIN < VOUT
200mA VIN > VOUT
MPPC
PGOOD
PWM
VS1
VS2
VS3
GND
VCC
PGND
2.2µF
31291 TA01a
Efficiency and Power Loss vs Load
100 1000
90 EFFICIENCY
80 100
70
60 10
50
POWER LOSS
40 1
30
20
10
0 VOUT = 5V
0.01 0.1
1
VIN = 2.5V
VIN = 3.6V
0.1
VIN = 5V
VIN = 15V 0.01
10 100 1000
OUTPUT CURRENT (mA)
3129 TA01b
For more information www.linear.com/LTC3129-1
31291fc
1
1 page  
LTC3129-1
Typical Performance Characteristics TA = 25°C, unless otherwise noted.
Efficiency, VOUT = 2.5V
100
90 BURST
80
70
60
50
40 PWM
30
20
10
0
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1
10 100 1000
OUTPUT CURRENT (mA)
31291 G01
Power Loss, VOUT = 2.5V
1000
100 PWM
10
1
0.1
0.01
0.01
BURST
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
31291 G02
Efficiency, VOUT = 3.3V
100
90 BURST
80
70
60
50
PWM
40
30
20
10
0
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
31291 G03
Power Loss, VOUT = 3.3V
1000
100 PWM
10
1
0.1
0.01
0.01
BURST
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1
10 100 1000
OUTPUT CURRENT (mA)
31291 G04
Efficiency, VOUT = 4.1V
100
BURST
90
80
70
60
50
40 PWM
30
20
10
0
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1
10 100 1000
OUTPUT CURRENT (mA)
31291 G04a
Power Loss, VOUT = 4.1V
1000
100 PWM
10
1
0.1
0.01
0.01
BURST
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
31291 G04b
Efficiency, VOUT = 5V
100
90 BURST
80
70
60
50
PWM
40
30
20
10
0
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1
10 100 1000
OUTPUT CURRENT (mA)
31291 G05
Power Loss, VOUT = 5V
1000
100 PWM
10
1
0.1
0.01
0.01
BURST
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
31291 G06
For more information www.linear.com/LTC3129-1
Efficiency, VOUT = 6.9V
100
90 BURST
80
70
60
50 PWM
40
30
20
10
0
0.01
VIN = 2.5V
VIN = 3.6V
VIN = 5V
VIN = 10V
VIN = 15V
0.1 1 10 100 1000
OUTPUT CURRENT (mA)
31291 G06a
31291fc
5
5 Page 
LTC3129-1
Operation
Introduction
The LTC3129-1 is a 1.3µA quiescent current, monolithic,
current mode, buck-boost DC/DC converter that can operate
over a wide input voltage range of 1.92V to 15V and provide
up to 200mA to the load. Eight fixed, user-programmable
output voltages can be selected using the three digital
programming pins. Internal, low RDS(ON) N-channel power
switches reduce solution complexity and maximize effi-
ciency. A proprietary switch control algorithm allows the
buck-boost converter to maintain output voltage regulation
with input voltages that are above, below or equal to the
output voltage. Transitions between the step-up or step-
down operating modes are seamless and free of transients
and sub-harmonic switching, making this product ideal
for noise sensitive applications. The LTC3129-1 operates
at a fixed nominal switching frequency of 1.2MHz, which
provides an ideal trade-off between small solution size and
high efficiency. Current mode control provides inherent
input line voltage rejection, simplified compensation and
rapid response to load transients.
Burst Mode capability is also included in the LTC3129-1
and is user-selected via the PWM input pin. In Burst Mode
operation, the LTC3129-1 provides exceptional efficiency at
light output loading conditions by operating the converter
only when necessary to maintain voltage regulation. The
Burst Mode quiescent current is a miserly 1.3µA. At higher
loads, the LTC3129-1 automatically switches to fixed fre-
quency PWM mode when Burst Mode operation is selected.
(Please refer to the Typical Performance Characteristic
curves for the mode transition point at different input and
output voltages). If the application requires extremely low
noise, continuous PWM operation can also be selected
via the PWM pin.
A MPPC (maximum power point control) function is also
provided that allows the input voltage to the converter to
be servo’d to a programmable point for maximum power
when operating from various non-ideal power sources
such as photovoltaic cells. The LTC3129-1 also features
an accurate RUN comparator threshold with hysteresis,
allowing the buck-boost DC/DC converter to turn on and
off at user-selected VIN voltage thresholds. With a wide
voltage range, 1.3µA Burst Mode current and program-
mable RUN and MPPC pins, the LTC3129-1 is well suited
for many diverse applications.
PWM Mode Operation
If the PWM pin is high or if the load current on the con-
verter is high enough to command PWM mode operation
with PWM low, the LTC3129-1 operates in a fixed 1.2MHz
PWM mode using an internally compensated average
current mode control loop. PWM mode minimizes output
voltage ripple and yields a low noise switching frequency
spectrum. A proprietary switching algorithm provides
seamless transitions between operating modes and
eliminates discontinuities in the average inductor cur-
rent, inductor ripple current and loop transfer function
throughout all modes of operation. These advantages
result in increased efficiency, improved loop stability and
lower output voltage ripple in comparison to the traditional
buck-boost converter.
Figure 1 shows the topology of the LTC3129-1 power stage
which is comprised of four N-channel DMOS switches and
their associated gate drivers. In PWM mode operation
both switch pins transition on every cycle independent of
the input and output voltages. In response to the internal
control loop command, an internal pulse width modulator
generates the appropriate switch duty cycle to maintain
regulation of the output voltage.
CBST1
L
CBST2
BST1
VIN SW1
SW2 VOUT
BST2
VCC VCC
AD
VCC VCC
BC
PGND
PGND
LTC3129-1
31291 F01
Figure 1. Power Stage Schematic
For more information www.linear.com/LTC3129-1
31291fc
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC3129-1.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC3129-1 | 200mA Synchronous Buck-Boost DC/DC Converter | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |