LM3269 Datasheet, PDF (1/5 Pages) Texas Instruments – Seamless-Transition Buck-Boost Converter for 3G and 4G RF Power Amplifiers

LM3269
PRODUCT BRIEF
Seamless-Transition Buck-Boost Converter for 3G and 4G RF Power
Amplifiers
General Description
The LM3269 is a buck-boost DC/DC converter designed to
generate output voltages above or below a given input voltage
and is particularly suitable for single cell Li-ion batteries for
portable applications.
The LM3269 operates at a 2.4 MHz typical switching frequen-
cy in full synchronous operation and provides seamless tran-
sitions between buck and boost operating regimes. The
LM3269 operates in energy saving Pulse Frequency Modu-
lation (PFM) mode for increased efficiencies and current sav-
ings during low-power RF transmission modes.
The power converter topology needs only one inductor and
two capacitors. A unique internal power-switching topology
enables high overall efficiency.
The LM3269 is internally compensated for buck and boost
modes of operation, thus providing an optimal transient re-
sponse.
The LM3269 is available in a 12-bump lead-free micro SMD
package of size 2.0 mm x 2.5 mm x 0.6 mm.
Notice: This document is not a datasheet. For more in-
formation regarding this product or to order samples
please contact your local Texas Instruments sales office.
Typical Application Circuit
Features
● ^{Operates from a Single Li-Ion Cell: 2.7V to 5.5V}
● ^{Adjustable Output Voltage: 0.6V to 4.2V}
● ^{PFM Operation}
● ^{750 mA Maximum Load Capability for P}_VIN ^{≥ 3.0V,}
V_OUT = 3.8V
● ^{2.4 MHz (typ.) Switching Frequency}
● ^{Seamless Buck-Boost Mode Transition}
● ^{Fast Output Voltage Transition: 1.4V to 3.0V in 10 µs}
● ^{High-Efficiency: 95% typ. at P}_VIN ^{= 3.7V, V}_OUT ^{= 3.3V,}
at 300 mA
● ^{Input Overcurrent Limit}
● ^{Internal Compensation}
● ^{12-bump micro SMD Package}
● ^{Solution Size = 18.8 mm2}
Applications
● ^{Power Supply for 3G/4G Power Amplifiers}
● ^{Cellular Phones}
● ^{Portable Hard Disk Drives}
● ^PDAs
PRODUCTION DATA information is current as of
publication date. Products conform to specifications per
the terms of the Texas Instruments standard warranty.
Production processing does not necessarily include
testing of all parameters.
301732 SNVS793B
30173201
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