IC AMP AUDIO PWR 6.7W MONO 24LLP

LM48511SQX/NOPB

Manufacturer Part NumberLM48511SQX/NOPB
DescriptionIC AMP AUDIO PWR 6.7W MONO 24LLP
ManufacturerNational Semiconductor
SeriesBoomer®
TypeClass D
LM48511SQX/NOPB datasheet
 


Specifications of LM48511SQX/NOPB

Output Type1-Channel (Mono)Max Output Power X Channels @ Load6.7W x 1 @ 4 Ohm
Voltage - Supply3 V ~ 5.5 VFeaturesDepop, Differential Inputs, Short-Circuit and Thermal Protection, Shutdown
Mounting TypeSurface MountPackage / Case24-LLP
For Use WithLM48511SQBD - BOARD EVAL BOOST C LM48511Lead Free Status / RoHS StatusLead free / RoHS Compliant
Other namesLM48511SQX  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
Page 1/22

Download datasheet (446Kb)Embed
Next
LM48511
3W, Ultra-Low EMI, Filterless, Mono, Class D Audio Power
Amplifier with Spread Spectrum
General Description
The LM48511 integrates a boost converter with a high effi-
ciency Class D audio power amplifier to provide 3W continu-
ous power into an 8Ω speaker when operating from a 5V
power supply. When operating from a 3V to 4V power supply,
the LM48511 can be configured to drive 1 to 2.5W into an
8Ω load with less than 1% distortion (THD+N). The Class D
amplifier features a low noise PWM architecture that elimi-
nates the output filter, reducing external component count,
board area consumption, system cost, and simplifying design.
A selectable spread spectrum modulation scheme suppress-
es RF emissions, further reducing the need for output filters.
The LM48511’s switching regulator is a current-mode boost
converter operating at a fixed frequency of 1MHz. Two se-
lectable feedback networks allow the LM48511 regulator to
dynamically switch between two different output voltages, im-
proving 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 5V, extends battery life when compared to Boost-
ed 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 over-
load protection prevent the device from damage during fault
conditions. Superior click and pop suppression eliminates au-
dible transients during power-up and shutdown.
EMI Graph
Boomer
®
is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation
Key Specifications
■ 
Quiescent Power Supply Current
V
DD
V
DD
■ 
P
at V
O
= 8Ω, THD+N = 1%
R
L
■ 
P
at V
O
= 8Ω, THD+N = 1%
R
L
■ 
P
at V
O
= 4Ω, THD+N = 1%
R
L
■ 
Shutdown Current at V
Features
3W Output into 8Ω at 5V 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
3.0V – 5.5V operation
Low Shutdown Current
Click and Pop Suppression
Applications
GPS
Portable media
Cameras
Mobile Phones
Handheld games
FIGURE 1. LM48511 RF Emissions — 3 inch cable
300222
February 25, 2008
= 3V
= 5V
13.5mA (typ)
= 5V, PV1 = 7.8V
DD
= 3V, PV1 = 4.8V
DD
= 5V, PV1 = 7.8V
DD
0.01μA (typ)
= 3V
DD
300222h5
www.national.com
9mA (typ)
3.0W (typ)
1W (typ)
5.4W (typ)

LM48511SQX/NOPB Summary of contents

  • Page 1

    ... Superior click and pop suppression eliminates au- dible transients during power-up and shutdown. EMI Graph Boomer ® registered trademark of National Semiconductor Corporation. © 2008 National Semiconductor Corporation Key Specifications ■  Quiescent Power Supply Current V ...

  • Page 2

    Typical Application FIGURE 2. Typical LM48511 Audio Amplifier Application Circuit www.national.com 2 300222i3 ...

  • Page 3

    Connection Diagrams SQ Package Top View Order Number LM48511SQ See NS Package Number SQA24B SQ Package Marking 300222d5 Top View U — Wafer fab code Z — Assembly plant XY — 2 Digit date code TT — Lot traceability 3 ...

  • Page 4

    Pin Descriptions LLP-24 Pin 1 2 22,23 24 DAP www.national.com Name Regulator Feedback Select. Connect to VDD to select feedback FB_SEL network ...

  • Page 5

    ... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (V , PV1 Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for V 8Ω ...

  • Page 6

    Symbol Parameter ε Output Noise OS Power Supply Rejection Ratio PSRR (Input Referred) Common Mode Rejection Ratio CMRR (Input Referred) η Efficiency V Feedback Pin Reference Voltage FB Electrical Characteristics V The following specifications apply for 1kHz, ...

  • Page 7

    Symbol Parameter P Output Power O THD+N Total Harmonic Distortion + Noise ε Output Noise OS Power Supply Rejection Ratio PSRR (Input Referred) Common Mode Rejection Ratio CMRR (Input Referred) η Efficiency V Feedback Pin Reference Voltage FB Conditions = ...

  • Page 8

    Electrical Characteristics V The following specifications apply for V 8Ω 1kHz, SS/FF = GND, unless otherwise specified. Limits apply for T Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Logic Voltage Input High ...

  • Page 9

    Symbol Parameter Power Supply Rejection Ratio PSRR (Input Referred) Common Mode Rejection Ratio CMRR (Input Referred) η Efficiency V Feedback Pin Reference Voltage FB Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including ...

  • Page 10

    Typical Performance Characteristics THD+N vs Frequency 2W, filter = 22kHz THD+N vs Frequency 1.5W, filter = 22kHz THD+N vs Output ...

  • Page 11

    THD+N vs Output Power = 8Ω 3V, 3.6V, 5V 1kHz, filter = 22kHz 4.87kΩ 300222i1 Boost Amplifier vs Output Power = 8Ω 5V ...

  • Page 12

    PSRR vs Frequency V = 3.6V 200mV RIPPLE PP Supply Current vs Supply Voltage PV = 7.8V 1 Supply Current vs Supply Voltage PV = 4.8V 1 www.national.com = 8Ω ...

  • Page 13

    Power Dissipation vs Output Power = 8Ω 3.6V 7V 300222f8 Boost Converter Efficiency vs I LOAD( 300222h8 Boost Converter Efficiency vs I LOAD(DC) ...

  • Page 14

    Application Information GENERAL AMPLIFIER FUNCTION The LM48511 features a Class D audio power amplifier that utilizes a filterless modulation scheme, reducing external component count, conserving board space and reducing sys- tem cost. The outputs of the device transition from PV1 ...

  • Page 15

    FB_SEL can be susceptible to noise interference. To prevent an accidental state change, either bypass FB_SEL with a 0.1µF capacitor to GND, or connect the higher voltage feed- back network to FB_GND0, and the lower voltage feedback network to FB_GND1. ...

  • Page 16

    Selecting a soft-start capacitor (C SS off between the wake-up time and the startup transient cur- rent. Using a larger capacitor value will increase wake-up time and decrease startup transient current while the apposite ef- fect happens with a smaller ...

  • Page 17

    Where R is the ESR of the output capacitor. The value given by: FB3 π CALCULATING REGULATOR OUTPUT CURRENT The load current of the boost converter is related to ...

  • Page 18

    Build Of Materials Designator Description Cf1 CHIP CAPACITOR GENERIC CINA CHIP CAPACITOR GENERIC CINB CHIP CAPACITOR GENERIC Co CHIP CAPACITOR GENERIC Cs1 CHIP CAPACITOR GENERIC Cs2 CHIP CAPACITOR GENERIC D1 SCHOTTKY DIO L1 R1 CHIP RESISTOR GENERIC R2 CHIP RESISTOR ...

  • Page 19

    Revision History Rev Date 1.0 07/24/07 1.1 07/25/07 1.2 09/25/07 1.3 11/06/07 1.4 02/25/08 Description Initial release. Input some text edits. Changed the Amplifier Voltage (Operating Ratings section) from 5.0V to 4.8V. Added another Po (@Vdd = 5V ...

  • Page 20

    Physical Dimensions www.national.com inches (millimeters) unless otherwise noted SQ Package Order Number LM48511SQ NS Package Number SQA24B 20 ...

  • Page 21

    Notes 21 www.national.com ...

  • Page 22

    ... For more National Semiconductor product information and proven design tools, visit the following Web sites at: Products Amplifiers www.national.com/amplifiers Audio www.national.com/audio Clock Conditioners www.national.com/timing Data Converters www.national.com/adc Displays www.national.com/displays Ethernet www.national.com/ethernet Interface www.national.com/interface LVDS www.national.com/lvds Power Management www.national.com/power Switching Regulators www.national.com/switchers LDOs www ...