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LM3212 Fiches technique(PDF) 1 Page - Texas Instruments

No de pièce LM3212
Description  Step-Down DC-DC Converter
Download  25 Pages
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI1 - Texas Instruments

LM3212 Fiches technique(HTML) 1 Page - Texas Instruments

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background image
FB
EN
VDD
PVIN
VCON
SW
VIN
2.7V to 5.5V
VOUT
0.5V to 3.4V
10 PF
4.7 PF
SGND
PGND
2.2 PH
LM3212
AUTO_BY
PACB
ACB
4.7 PF
Switcher
Side
PA Side
LM3212
www.ti.com
SNOSB37C – DECEMBER 2008 – REVISED APRIL 2013
LM3212 Step-Down DC-DC Converter with Analog Bypass Mode for RF Power Amplifiers
Check for Samples: LM3212
1
FEATURES
DESCRIPTION
The LM3212 is a DC-DC converter optimized for
2
1.6 MHz (typ.) PWM Switching Frequency
powering GSM RF power amplifiers (PAs) from a
ACB Reduces Inductor Requirements and Size
single Lithium-Ion cell; however, it may also be used
Operates From a Single Li-Ion Cell (2.7V to
in other applications. The LM3212 steps down an
5.5V)
input voltage from 2.7V to 5.5V to a dynamically
adjustable output voltage of 0.5V to 3.4V. The output
Dynamically Adjustable Output Voltage (0.5V
voltage is set through a VCON analog input that
to 3.4V)
adjusts
the
output
voltage
to
ensure
efficient
2.5A Maximum Load Current
operation at all power levels of the RF PA.
Analog Bypass Function With Low Bypass
The LM3212 has a unique Active Current Bypass
Resistance (33 m
Ω typ.)
(ACB) feature that speeds up output voltage transition
High Efficiency to 95% with Internal
times, provides extra drive and a low-resistance
Synchronous Rectification
analog bypass. The LM3212 has an AUTO_BY pin to
force the LM3212 into bypass mode during low input-
16-bump DSBGA Package
voltage operation thus overriding the automatic
Current Overload Protection
analog bypass feature. Forced bypass can also be
Thermal Overload Protection
achieved by setting VCON > VIN/2.5.
In addition the LM3212 offers a fixed-frequency PWM
APPLICATIONS
mode to minimize RF interference and a shutdown
Battery-Powered 2G/3G/4G RF Power
mode to turn the device off and reduce battery
consumption to 0.02 µA (typ.)
Amplifiers
Hand-Held Radios
The LM3212 is available in a 16-bump lead-free
DSBGA package. A 1.6 MHz switching frequency
RF PC Cards
allows use of tiny surface-mount components for the
required inductor and two ceramic capacitors.
Typical Application
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 © 2008–2013, 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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