2.2 2H

PVIN

PVIN

EN

SGND

PGND

SW1

SW2

LM3269

VOUT

FB

VCON

RF PA

4.7 2F

10 2F

GPO1

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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

3 Description

The

LM3269

is

buck-boost

DC-DC

converter

1

•

Operates From a Single Li-Ion Cell: 2.7 V to 5.5 V

designed to generate output voltages above or below

•

Adjustable Output Voltage: 0.6 V to 4.2 V

a given input voltage and is particularly suitable for

•

Automatic PFM or PWM Mode Change

portable applications powered by a single-cell Li-ion

battery.

•

750-mA Maximum Load Capability for

The LM3269 operates at a 2.4-MHz typical switching

•

2.4-MHz (typical) Switching Frequency

frequency in full synchronous operation and provides

seamless

transitions

between

buck

and

boost

•

Seamless Buck-Boost Mode Transition

operating regimes. The LM3269 operates in energy-

•

Fast Output Voltage Transition: 1.4 V to 3 V

saving Pulse Frequency Modulation (PFM) mode for

in 10 µs

increased efficiencies and current savings during low-

•

power RF transmission modes.

The power converter topology needs only one

•

Input Overcurrent Limit

inductor and two capacitors. A unique internal power

switch topology enables high overall efficiency.

•

Internal Compensation

The LM3269 is internally compensated for buck and

2 Applications

boost modes of operation, thus providing an optimal

transient response.

•

Power Supply for 3G/4G Power Amplifiers

•

Cellular Phones

When considering using the LM3269 in a system

design, please review the layout instruactions at the

•

Portable Hard Disk Drives

end of this document.

•

PDAs

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (MAX)

LM3269

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

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.