DC-DC Converter. LM3242 Datasheet

LM3242 Converter. Datasheet pdf. Equivalent

LM3242 Datasheet
Recommendation LM3242 Datasheet
Part LM3242
Description Step-Down DC-DC Converter
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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.



Texas Instruments 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
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Product Folder Links: LM3242
Copyright © 2011–2015, Texas Instruments Incorporated



Texas Instruments LM3242
www.ti.com
5 Pin Configuration and Functions
LM3242
SNOSB48E – OCTOBER 2011 – REVISED AUGUST 2015
VCON
YFQ Package
9-Pin DSBGA
Top View (left); Bottom View (right)
SGND PGND
PGND SGND
VCON
EN NC SW
SW NC
EN
BPEN FB VIN
VIN FB BPEN
PIN
NUMBER
NAME
A1 VCON
A2 SGND
A3 PGND
B1 EN
B2 NC
B3 SW
C1 BPEN
C2 FB
C3 VIN
TYPE
A/I
G
G
D/I
P/O
D/I
A
P/I
Pin Functions
DESCRIPTION
Voltage control analog input. VCON controls VOUT in PWM and ECO modes. VCON may also
be used to force bypass condition by setting VCON > VIN/2.5.
Signal ground for analog and control circuitry.
Power ground for the power MOSFETs and gate drive circuitry
Enable Input. Set this digital input high for normal operation. For shutdown, set low. Do not
leave EN pin floating.
Do not connect to PGND directly — Internally connected to SGND.
Switching node connection to the internal PFET switch and NFET synchronous rectifier.
Connect to an inductor with a saturation current rating that exceeds the maximum Switch Peak
Current Limit specification of the LM3242.
Bypass Enable input. Set this digital input high to force bypass operation. For normal operation
with automatic bypass, set low or connect to ground. Do not leave this pin floating.
Feedback analog input and bypass FET output. Connect to the output at the output filter
capacitor.
Voltage supply input for SMPS converter.
Copyright © 2011–2015, Texas Instruments Incorporated
Product Folder Links: LM3242
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