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LM3253-C Datasheet(PDF) 1 Page - Texas Instruments

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Part # LM3253-C
Description  High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3253-C Datasheet(HTML) 1 Page - Texas Instruments

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LM3253
www.ti.com
SNVS791Q – FEBRUARY 2012 – REVISED MAY 2013
LM3253 High-Current Step-Down Converter for 2G/3G/4G RF Power Amplifiers
Check for Samples: LM3253
1
FEATURES
2
High-Efficiency PFM and PWM Modes with
DESCRIPTION
Internal Synchronous Rectification
The LM3253 is a DC-DC converter optimized for
powering multi-mode 2G/3G/4G RF power amplifiers
Analog Bypass Function with Low Dropout
(PAs) from a single Lithium-Ion cell. The LM3253
Resistance (45 m
Ω typ.)
steps down an input voltage from 2.7V to 5.5V to a
Dynamically Adjustable Output Voltage, 0.4V
dynamically adjustable output voltage of 0.4V to 3.6V.
to 3.6V (typ.), in PFM and PWM modes
The output voltage is set through a VCON analog
3A Maximum Load Current in PWM Mode
input that adjusts the output voltage to ensure
efficient operation at all power levels of the RF PA.
2.7MHz (average) PWM Switching Frequency
The
LM3253
is
optimized
for
USB
datacard
Modulated Switching Frequency to Aid Rx
applications.
Band Compliance
The LM3253 operates in constant frequency Pulse
Operates From a Single Li-ion Cell
Width Modulation (PWM) mode producing a small
(2.7V to 5.5V)
and predictable amount of output voltage ripple. This
ACB Reduces Inductor Requirements and Size
enables best ECTEL power requirements in GMSK
and EDGE spectral compliance, with the minimal
Minimum Total Solution Size by Using Small
amount of filtering and excess headroom. When
Footprint and Case Size Inductor and
operating in Pulse Frequency Modulation (PFM)
Capacitors
mode, the LM3253 enables the lowest DG09 current
16-bump Thin DSBGA Package
consumption
and
therefore
maximizes
system
Current and Thermal Overload Protection
efficiency.
The LM3253 has a unique Active Current assist and
APPLICATIONS
analog Bypass (ACB) feature to minimize inductor
size without any loss of output regulation for the
USB Datacards
entire battery voltage and RF output power range,
Cellular Phones
until dropout. ACB provides a parallel current path,
Hand-Held Radios
when needed, to limit the maximum inductor current
RF PC Cards
to 1.84A (typ.) while still driving a 3A load. The ACB
also enables operation with minimal dropout voltage.
Battery-Powered RF Devices
The LM3253 is available in a small 2 mm x 2 mm
chip-scale 16-bump DSBGA package.
When considering the use of the LM3253 in a system
design, contact the Texas Instruments Sales or Field
Application engineer for a copy of the "LM3253:
DC-DC Converter for 3G/4G RF PAs PCB Layout
Considerations.”
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 © 2012–2013, 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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