LM3269 Buck-Boost Converter Datasheet

LM3269 Datasheet, PDF, Equivalent


Part Number

LM3269

Description

Seamless-Transition Buck-Boost Converter

Manufacture

etcTI

Total Page 27 Pages
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LM3269
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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
VBATT 3 V, VOUT = 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 VBATT = 3.7 V,
VOUT = 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
VBATT: 2.7V to 5.5V
10 2F
SW1
SW2
PVIN
PVIN
VOUT
FB
LM3269
EN VCON
VOUT: 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.

LM3269
LM3269
SNVS793D – NOVEMBER 2011 – REVISED MAY 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information .................................................. 4
6.5 Electrical Characteristics........................................... 5
6.6 System Characteristics ............................................ 5
6.7 Switching Characteristics .......................................... 6
6.8 Typical Characteristics .............................................. 7
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................. 10
7.4 Device Functional Modes........................................ 10
8 Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Application ................................................. 11
9 Power Supply Recommendations...................... 14
10 Layout................................................................... 15
10.1 Layout Guidelines ................................................. 15
10.2 Layout Examples................................................... 18
10.3 DSBGA Package Assembly And Use ................... 20
11 Device and Documentation Support ................. 21
11.1 Device Support...................................................... 21
11.2 Documentation Support ........................................ 21
11.3 Trademarks ........................................................... 21
11.4 Electrostatic Discharge Caution ............................ 21
11.5 Glossary ................................................................ 21
12 Mechanical, Packaging, and Orderable
Information ........................................................... 21
4 Revision History
Changes from Revision C (May 2013) to Revision D
Page
• Added Device Information table, Pin Configuration and Functions section, ESD Rating table, Feature Description ,
Device Functional Modes, Application and Implementation, Power Supply Recommendations, Device and
Documentation Support , and Mechanical, Packaging, and Orderable Information sections ................................................ 1
• Deleted Recommended Capacitance Specifications table as info contained in other tables .............................................. 12
Changes from Revision B (August 2012) to Revision C
Page
• Changed product brief to full data sheet ............................................................................................................................... 1
2 Submit Documentation Feedback
Product Folder Links: LM3269
Copyright © 2011–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3269 SNVS793D – NOVEMBER 2011 – REVISED MAY 2015 LM3269 Seaml ess-Transition Buck-Boost Converter for 3G and 4G RF Power Amplifiers 1 Featu res •1 Operates From a Single Li-Ion Cell: 2.7 V to 5.5 V • Adjustable Out put Voltage: 0.6 V to 4.2 V • Automat ic PFM or PWM Mode Change • 750-mA Ma ximum Load Capability for VBATT ≥ 3 V , VOUT = 3.8 V • 2.4-MHz (typical) Sw itching Frequency • Seamless Buck-Boo st Mode Transition • Fast Output Volt age Transition: 1.4 V to 3 V in 10 µs • High-Efficiency: 95% typical at VBA TT = 3.7 V, VOUT = 3.3 V, at 300 mA • Input Overcurrent Limit • Internal C ompensation 2 Applications • Power Su pply for 3G/4G Power Amplifiers • Cel lular Phones • Portable Hard Disk Dri ves • PDAs 3 Description The LM3269 is buck-boost DC-DC converter designed to generate output voltages above or be low a given input voltage and is particularly suitable for portable applications powered by a sing.
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