LM4927SDBD National Semiconductor, LM4927SDBD Datasheet

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LM4927SDBD

Manufacturer Part Number
LM4927SDBD
Description
BOARD EVALUATION LM4927SD
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4927SDBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
2.5W x 1 @ 4 Ohm
Voltage - Supply
2.4 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4927
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
© 2006 National Semiconductor Corporation
LM4927
2.5 Watt Fully Differential Audio Power Amplifier With
Shutdown
General Description
The LM4927 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 2.5 watts of continuous
average power to a 4Ω load with less than 10% distortion
(THD+N) from a 5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4927 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4927 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by logic
low. Additionally, the LM4927 features an internal thermal
shutdown protection mechanism.
The LM4927 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DC
power supply.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS201525
Key Specifications
Features
n Fully differential amplification
n Available in space-saving micro-array LLP package
n Ultra low current shutdown mode
n Can drive capacitive loads up to 100pF
n Improved pop & click circuitry eliminates noises during
n 2.4 - 5.5V operation
n No output coupling capacitors, snubber networks or
Applications
n Mobile phones
n PDAs
n Portable electronic devices
j
j
j
j
turn-on and turn-off transitions
bootstrap capacitors required
Improved PSRR at 217Hz
Power Output at 5.0V
Power Output at 3.3V
Shutdown Current
@
@
10% THD (4Ω)
1% THD
20152529
550mW (typ)
www.national.com
0.1µA (typ)
85dB (typ)
2.5W (typ)
April 2006

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LM4927SDBD Summary of contents

Page 1

... The LM4927 contains advanced pop & click circuitry which eliminates noises which would otherwise occur during turn-on and turn-off transitions. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j Improved PSRR at 217Hz j Power Output at 5.0V j Power Output at 3 ...

Page 2

Connection Diagrams www.national.com 8 Pin LLP Package 20152563 Top View Order Number LM4927SD See NS Package Number SDA08A 8 Pin LLP Marking 20152565 Top View Z = Assembly Plant Digit Date Code TT = Die Traceability L4927 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage 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 ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. (Continued) Symbol Parameter P Output Power o THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio CMRR Common-Mode Rejection Ratio V Output Offset OS V Shutdown Voltage Input High SDIH ...

Page 5

Typical Performance Characteristics THD+N vs Frequency V = 2.6V 8Ω THD+N vs Frequency 8Ω THD+N vs Frequency 8Ω ...

Page 6

Typical Performance Characteristics THD+N vs Output Power V = 2.6V THD+N vs Output Power 8Ω THD+N vs Output Power 8Ω www.national.com (Note 10) ...

Page 7

Typical Performance Characteristics PSRR vs Frequency 8Ω Inputs terminated to GND 500kHz Output Power vs Supply Voltage R = 8Ω L CMRR vs Frequency 8Ω DD ...

Page 8

Typical Performance Characteristics PSRR vs Common Mode Voltage 8Ω 217Hz DD L Power Dissipation vs Output Power V = 2.6V 8Ω and 4Ω Power Dissipation vs Output Power V ...

Page 9

Typical Performance Characteristics Noise Floor Clipping Voltage vs Supply Voltage (Note 10) (Continued) 20152552 Output Power vs Load Resistance 20152548 9 Noise Floor 20152551 20152553 www.national.com ...

Page 10

... Demonstration Board Layout section. Further detailed and specific information concerning PCB layout, fabrication, and mounting an LLP package is available from National Semiconductor’s package Engineering Group un- der application note AN1187. PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING 4Ω LOADS Power dissipated by a load is a function of the voltage swing across the load and the load’ ...

Page 11

Application Information (2π Single-Ended DMAX DD L However, a direct consequence of the increased power de- livered to the load by a bridge amplifier is an increase in internal power dissipation ...

Page 12

Application Information Tolerance 20% 0.8R 1.2R 10% 0.9R 1.1R 5% 0.95R 1.05R 1% 0.99R 1.01R Since the same variations can have a significant effect on PSRR and CMRR performance highly ...

Page 13

Revision History Rev 0.1 0.2 0.3 Date 06/01/05 1st time WEB release for this project. (MC) 04/07/06 Edited the Rf spec (5V EC table) to reveal max and min limits of 47 and 37 kΩ respectively (per Bic and Daniel). ...

Page 14

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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