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LM48511 Datasheet Preview

LM48511 Datasheet

Audio Power Amplifier

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LM48511
SNAS416K – JULY 2007 – REVISED NOVEMBER 2019
LM48511 3-W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power Amplifier With
Spread Spectrum
1 Features
1 3-W Output into 8 at 5 V With THD+N = 1%
• Selectable spread spectrum mode reduces EMI
• 80% Efficiency
• Independent regulator and amplifier shutdown
controls
• Dynamically Selectable Regulator Output Voltages
• Filterless Class D
• 3-V to 5.5-V Operation
• Low shutdown current
• Click and pop suppression
• Key specifications
– Quiescent power supply current
– VDD = 3 V 9 mA (Typical)
– VDD = 5 V 13.5 mA (Typical)
– PO at VDD = 5 V, PV1 = 7.8 V, RL = 8 ,
THD+N = 1% 3 W (Typical)
– PO at VDD = 3 V, PV1 = 4.8 V, RL = 8 ,
THD+N = 1% 1 W (Typical)
– PO at VDD = 5 V, PV1 = 7.8 V, RL = 4 ,
THD+N = 1% 5.4 W (Typical)
– Shutdown Current at VDD = 3 V, 0.01 μA
(Typical)
The switching regulator of the LM48511 is a current-
mode boost converter operating at a fixed frequency
of 1 MHz. Two selectable feedback networks allow
the LM48511 regulator to dynamically switch between
two different output voltages, improving efficiency by
optimizing the amplifier’s supply voltage based on
battery voltage and output power requirements.
The LM48511 is designed for use in portable devices,
such as GPS, mobile phones, and MP3 players. The
high, 80% efficiency at 5 V, extends battery life when
compared to Boosted Class AB amplifiers.
Independent regulator and amplifier shutdown
controls optimize power savings by disabling the
regulator when high-output power is not required.
The gain of the LM48511 is set by external resistors,
which allows independent gain control from multiple
sources by summing the signals. Output short circuit
and thermal overload protection prevent the device
from damage during fault conditions. Superior click
and pop suppression eliminates audible transients
during power-up and shutdown.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LM48511
WQFN (24)
5.00 mm × 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
2 Applications
GPS
Portable media
Cameras
Mobile phones
Handheld games
3 Description
The LM48511 device integrates a boost converter
with a high-efficiency Class D audio power amplifier
to provide 3-W continuous power into an 8-speaker
when operating from a 5-V power supply.
When operating from a 3-V to 4-V power supply, the
LM48511 can be configured to drive 1 to 2.5 W into
an 8-load with less than 1% distortion (THD+N).
The Class D amplifier features a low-noise PWM
architecture that eliminates the output filter, reducing
external component count, board area consumption,
system cost, and simplifying design. A selectable
spread spectrum modulation scheme suppresses RF
emissions, further reducing the need for output filters.
EMI Graph: LM48511 RF Emissions — 3-Inch
Cable
55.0
FCC Class B Limit
50.0
45.0
40.0
LM45811 EMI Spectrum
35.0
30.0
25.0
20.0
30.0 100.0
200.0
300.0
400.0 500.0 600.0
FREQUENCY (MHz)
700.0
800.0
900.0 1000.0
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.




etcTI

LM48511 Datasheet Preview

LM48511 Datasheet

Audio Power Amplifier

No Preview Available !

LM48511
SNAS416K – JULY 2007 – REVISED NOVEMBER 2019
www.ti.com
Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 4
6 Specifications......................................................... 5
6.1 Absolute Maximum Ratings ...................................... 5
6.2 ESD Ratings.............................................................. 5
6.3 Recommended Operating Conditions....................... 5
6.4 Thermal Information .................................................. 5
6.5 Electrical Characteristics VDD = 5 V.......................... 6
6.6 Electrical Characteristics VDD = 3.6 V....................... 7
6.7 Electrical Characteristics VDD = 3 V.......................... 8
6.8 Typical Characteristics .............................................. 9
7 Detailed Description ............................................ 13
7.1 Overview ................................................................. 13
7.2 Functional Block Diagram ....................................... 13
7.3 Feature Description................................................. 14
7.4 Device Functional Modes........................................ 15
8 Application and Implementation ........................ 16
8.1 Application Information............................................ 16
8.2 Typical Application ................................................. 16
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 22
10.1 Layout Guidelines ................................................. 22
10.2 Layout Example .................................................... 22
11 Device and Documentation Support ................. 23
11.1 Receiving Notification of Documentation Updates 23
11.2 Community Resources.......................................... 23
11.3 Trademarks ........................................................... 23
11.4 Electrostatic Discharge Caution ............................ 23
11.5 Glossary ................................................................ 23
12 Mechanical, Packaging, and Orderable
Information ........................................................... 23
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision J (October 2017) to Revision K
Page
• Changed pin labels in Figure 24 .......................................................................................................................................... 16
Changes from Revision I (August 2017) to Revision J
Page
• Changed Pin 20 From: FB_GND0 To: FB_GND1 in the Pin Image and Pin Functions table................................................ 4
• Changed Pin 21 From: FB_GND1 To: FB_GND0 in the Pin Image and Pin Functions table................................................ 4
Changes from Revision H (August 2015) to Revision I
Page
• Changed Pin 20 From: FB_GND1 To: FB_GND0 in the Pin Image and Pin Functions table................................................ 4
• Changed Pin 21 From: FB_GND0 To: FB_GND1 in the Pin Image and Pin Functions table................................................ 4
Changes from Revision G (May 2013) to Revision H
Page
• Added Pin Configuration and Functions section, ESD Ratings table, Feature Description section, Device Functional
Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device
and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .............................. 1
Changes from Revision F (October 2012) to Revision G
Page
• Changed layout of National Data Sheet to TI format ........................................................................................................... 20
Changes from Revision D (February 2012) to Revision E
Page
• Deleted the Typical limits (Vih and Vil) EC table.................................................................................................................... 6
2
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Product Folder Links: LM48511
Copyright © 2007–2019, Texas Instruments Incorporated



Part Number LM48511
Description Audio Power Amplifier
Maker etcTI
Total Page 3 Pages
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LM48511 Datasheet PDF





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