LM3269_16 Datasheet, PDF (1/27 Pages) Texas Instruments – Seamless-Transition Buck-Boost Converter

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LM3269
SNVS793D – NOVEMBER 2011 – REVISED MAY 2015
LM3269 Seamless-Transition Buck-Boost Converter
for 3G and 4G RF Power Amplifiers
1 Features
•1 Operates From a Single Li-Ion Cell: 2.7 V to 5.5 V
• Adjustable Output Voltage: 0.6 V to 4.2 V
• Automatic PFM or PWM Mode Change
• 750-mA Maximum Load Capability for
V_BATT ≥ 3 V, V_OUT = 3.8 V
• 2.4-MHz (typical) Switching Frequency
• Seamless Buck-Boost Mode Transition
• Fast Output Voltage Transition: 1.4 V to 3 V
in 10 µs
• High-Efficiency: 95% typical at V_BATT = 3.7 V,
V_OUT = 3.3 V, at 300 mA
• Input Overcurrent Limit
• Internal Compensation
2 Applications
• Power Supply for 3G/4G Power Amplifiers
• Cellular Phones
• Portable Hard Disk Drives
• PDAs
3 Description
The LM3269 is buck-boost DC-DC converter
designed to generate output voltages above or below
a given input voltage and is particularly suitable for
portable applications powered by a single-cell Li-ion
battery.
The LM3269 operates at a 2.4-MHz typical switching
frequency in full synchronous operation and provides
seamless transitions between buck and boost
operating regimes. The LM3269 operates in energy-
saving Pulse Frequency Modulation (PFM) mode for
increased efficiencies and current savings during low-
power RF transmission modes.
The power converter topology needs only one
inductor and two capacitors. A unique internal power
switch topology enables high overall efficiency.
The LM3269 is internally compensated for buck and
boost modes of operation, thus providing an optimal
transient response.
When considering using the LM3269 in a system
design, please review the layout instruactions at the
end of this document.
PART NUMBER
LM3269
Device Information⁽¹⁾
PACKAGE
BODY SIZE (MAX)
DSBGA (12)
2.529 mm x 2.022 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
2.2 2H
V_BATT: 2.7V to 5.5V
10 2F
SW1
SW2
PVIN
PVIN
VOUT
FB
LM3269
EN
VCON
V_OUT: 0.6V to 4.2V
RF PA
4.7 2F
GPO1
BB
RFIC
DAC
SGND
PGND
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.