LM3242 DC-DC Converter Datasheet

LM3242 Datasheet, PDF, Equivalent


Part Number

LM3242

Description

Step-Down DC-DC Converter

Manufacture

etcTI

Total Page 30 Pages
Datasheet
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LM3242
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LM3242
SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015
LM3242 6-MHz, 750-mA Miniature Adjustable Step-Down DC-DC Converter With Auto
Bypass for RF Power Amplifiers
1 Features
1 2.7-V to 5.5-V Input Voltage Operating From
Single Li-Ion Cell
• 6-MHz (typical) PWM Switching Frequency
• 0.4-V to 3.6-V Adjustable Output Voltage
• 750-mA Maximum Load Capability
(up to 1 A in Bypass)
• High Efficiency (95% typical at 3.9 VIN,
3.3 VOUT at 500 mA)
• Automatic ECO/PWM/BP Mode Change
• Current Overload Protection
• Thermal Overload Protection
• Soft-Start Function
• Small Chip Inductor in 0805 (2012) case size
2 Applications
• Battery-Powered 3G/4G RF PAs
• Battery-Powered RF Devices
• Hand-Held Radios
• RF PC Cards
3 Description
The LM3242 is a DC-DC converter optimized for
powering RF power amplifiers (PAs) from a single
lithium-ion cell; however, it may be used in many
other applications. It steps down an input voltage
from 2.7 V to 5.5 V to an adjustable output voltage
from 0.4 V to 3.6 V. Output voltage is set using a
VCON analog input for controlling power levels and
efficiency of the RF PA.
The LM3242 offers five modes of operation. In PWM
mode the device operates at a fixed frequency of
6 MHz (typical) which minimizes RF interference
when driving medium-to-heavy loads. At light load,
the device enters into ECO mode automatically and
operates with reduced switching frequency. In ECO
mode, the quiescent current is reduced and extends
the battery life. Shutdown mode turns the device off
and reduces battery consumption to 0.1 µA (typical).
In low-battery condition Bypass mode reduces the
voltage dropout to less than 50 mV (typical). The part
also features a Sleep mode.
The LM3242 is available in a 9-bump lead-free
DSBGA package. A high switching frequency (6 MHz)
allows use of only three tiny surface-mount
components: one inductor and two ceramic
capacitors.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (MAX)
LM3242
DSBGA (9)
1.51 mm × 1.385 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Typical Application
VIN
2.7V to 5.5V
10 PF
GPO1
DAC
BPEN
VIN
EN LM3242
VCON
SW
FB
SGND PGND
0.5 PH
VOUT = 2.5 x VCON
0.4V to 3.6V
4.7 PF
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.

LM3242
LM3242
SNOSB48E – OCTOBER 2011 – REVISED AUGUST 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 ............................................ 6
6.7 Timing Requirements ................................................ 6
6.8 Typical Characteristics .............................................. 7
7 Detailed Description ............................................ 11
7.1 Overview ................................................................. 11
7.2 Functional Block Diagram ....................................... 12
7.3 Feature Description................................................. 12
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 20
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Examples................................................... 23
10.3 DSBGA Package Assembly and Use ................... 25
11 Device and Documentation Support ................. 26
11.1 Device Support...................................................... 26
11.2 Documentation Support ........................................ 26
11.3 Community Resources.......................................... 26
11.4 Trademarks ........................................................... 26
11.5 Electrostatic Discharge Caution ............................ 26
11.6 Glossary ................................................................ 26
12 Mechanical, Packaging, and Orderable
Information ........................................................... 26
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (March 2013) to Revision E
Page
• Added Device Information and Pin Configuration and Functions sections, ESD Ratings table, Feature Description,
Device Functional Modes, Application and Implementation, Power Supply Recommendations, Layout, Device and
Documentation Support, and Mechanical, Packaging, and Orderable Information sections ................................................. 1
Changes from Revision C (March 2013) to Revision D
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 25
2 Submit Documentation Feedback
Product Folder Links: LM3242
Copyright © 2011–2015, Texas Instruments Incorporated


Features Product Folder Sample & Buy Technical Documents Tools & Software Support & Community LM3242 SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015 LM3242 6-M Hz, 750-mA Miniature Adjustable Step-Do wn DC-DC Converter With Auto Bypass for RF Power Amplifiers 1 Features •1 2 .7-V to 5.5-V Input Voltage Operating F rom Single Li-Ion Cell • 6-MHz (typic al) PWM Switching Frequency • 0.4-V t o 3.6-V Adjustable Output Voltage • 7 50-mA Maximum Load Capability (up to 1 A in Bypass) • High Efficiency (95% t ypical at 3.9 VIN, 3.3 VOUT at 500 mA) • Automatic ECO/PWM/BP Mode Change Current Overload Protection • Therm al Overload Protection • Soft-Start F unction • Small Chip Inductor in 0805 (2012) case size 2 Applications • Ba ttery-Powered 3G/4G RF PAs • Battery- Powered RF Devices • Hand-Held Radios • RF PC Cards 3 Description The LM3 242 is a DC-DC converter optimized for powering RF power amplifiers (PAs) from a single lithium-ion cell; however, it may be used in many other applications. It steps down a.
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