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LM3243 Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte LM3243
Spiegazioni elettronici  High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM3243 Scheda tecnica(HTML) 1 Page - Texas Instruments

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LM3243
PVIN VDD
SW
FB
VCON
PGND SGND
EN
MODE
VBATT
VOUT
ACB
BP
VCC_PA_2G
BB or
RFIC
DAC
GPO2
GPO1
BGND
1.5 µH
10 µF
1.0 µF
PA
4.7 µF
PA(s)
VCC_PA_3G
10 µF
LM3243
www.ti.com
SNVS782B – OCTOBER 2010 – REVISED FEBRUARY 2013
LM3243 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
Check for Samples: LM3243
1
FEATURES
DESCRIPTION
The LM3243 is a DC-DC converter optimized for
2
High-Efficiency PFM and PWM modes with
powering multi-mode 2G/3G/4G RF power amplifiers
Internal Synchronous Rectification
(PAs) from a single Lithium-Ion cell. The LM3243
Analog Bypass Function with Low Dropout
steps down an input voltage from 2.7V to 5.5V to a
Resistance (45 m
Ω typ.)
dynamically adjustable output voltage of 0.4V to 3.6V.
The output voltage is set through a VCON analog
Dynamically Adjustable Output Voltage, 0.4V
input that adjusts the output voltage to ensure
to 3.6V (typ.), in PFM and PWM Modes
efficient operation at all power levels of the RF PA.
2.5A Maximum Load Current in PWM Mode
The LM3243 operates in constant frequency PWM
2.7 MHz (average) PWM Switching Frequency
mode producing a small and predictable amount of
Modulated switching frequency to aid Rx Band
output voltage ripple. This enables best ECTEL
Compliance
power requirements in GMSK and EDGE spectral
Operates from a Single Li-ion Cell (2.7V to
compliance, with the minimal amount of filtering and
excess headroom. When operating in PFM mode, the
5.5V)
LM3243
enables
the
lowest
DG09
current
ACB reduces inductor requirements and size
consumption
and
therefore
maximizes
system
Minimum total solution size by using small
efficiency.
footprint and case size inductor and
The LM3243 has a unique Active Current assist and
capacitors
analog Bypass (ACB) feature to minimize inductor
16-bump thin DSBGA Package
size without any loss of output regulation for the
Current and Thermal Overload Protection
entire battery voltage and RF output power range,
until dropout. ACB provides a parallel current path,
when needed, to limit the maximum inductor current
APPLICATIONS
to 1.4A (typ.) while still driving a 2.5A load. The ACB
Cellular Phones
also enables operation with minimal dropout voltage.
Hand-Held Radios
The LM3243 is available in a small 2 mm x 2 mm
chip-scale 16-bump DSBGA package.
RF PC Cards
Battery-Powered RF Devices
If you are considering using the LM3243 in a system
design, please see the PCB Layout Considerations
section of this data sheet.
TYPICAL SYSTEM APPLICATION DIAGRAM
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2010–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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