LM4674ATL/NOPB National Semiconductor, LM4674ATL/NOPB Datasheet

IC AMP AUDIO PWR 2.5W D 16USMD

LM4674ATL/NOPB

Manufacturer Part Number
LM4674ATL/NOPB
Description
IC AMP AUDIO PWR 2.5W D 16USMD
Manufacturer
National Semiconductor
Series
Boomer®, PowerWise®r
Type
Class Dr
Datasheet

Specifications of LM4674ATL/NOPB

Output Type
2-Channel (Stereo)
Max Output Power X Channels @ Load
2.5W x 2 @ 4 Ohm
Voltage - Supply
2.4 V ~ 5.5 V
Features
Depop, Differential Inputs, PWM, Short-Circuit Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
16-MicroSMD
For Use With
LM4674ATLBD - BOARD EVALUATION LM4674ATL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4674ATLTR
© 2006 National Semiconductor Corporation
LM4674A
Filterless 2.5W Stereo Class D Audio Power Amplifier
General Description
The LM4674A is a single supply, high efficiency, 2.5W/
channel, filterless switching audio amplifier. A low noise
PWM architecture eliminates the output filter, reducing ex-
ternal component count, board area consumption, system
cost, and simplifying design.
The LM4674A is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing from a single 5V supply, the device is capable of deliv-
ering 2.5W/channel of continuous output power to a 4Ω load
with less than 10% THD+N. Flexible power supply require-
ments allow operation from 2.4V to 5.5V.
The LM4674A features high efficiency compared to conven-
tional Class AB amplifiers. When driving an 8Ω speaker from
a 3.6V supply, the device features 85% efficiency at P
500mW. Four gain options are pin selectable through the
GAIN0 and GAIN1 pins.
Output short circuit protection prevents the device from be-
ing damaged during fault conditions. Superior click and pop
suppression eliminates audible transients on power-up/down
and during shutdown. Independent left/right shutdown con-
trols maximizes power savings in mixed mono/stereo appli-
cations.
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DS201961
O
=
Key Specifications
Features
n Output Short Circuit Protection
n Stereo Class D operation
n No output filter required
n Logic selectable gain
n Independent shutdown control
n Minimum external components
n Click and Pop suppression
n Micro-power shutdown
n Available in space-saving 2mm x 2mm x 0.6mm micro
Applications
n Mobile phones
n PDAs
n Laptops
j
j
j
j
j
j
j
SMD package
at 3.6V supply
R
R
Efficiency at 3.6V, 100mW into 8Ω
Efficiency at 3.6V, 500mW into 8Ω
Efficiency at 5V, 1W into 8Ω
Quiescent Power Supply Current
Power Output at V
Power Output at V
Shutdown current
L
L
= 4Ω, THD ≤ 10%
= 8Ω, THD ≤ 10%
DD
DD
= 5V,
= 5V,
September 2006
www.national.com
0.1µA (typ)
2.5W (typ)
1.5W (typ)
80% (typ)
85% (typ)
85% (typ)
4mA

Related parts for LM4674ATL/NOPB

LM4674ATL/NOPB Summary of contents

Page 1

... Independent left/right shutdown con- trols maximizes power savings in mixed mono/stereo appli- cations. Boomer ® registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation Key Specifications j Efficiency at 3.6V, 100mW into 8Ω j Efficiency at 3.6V, 500mW into 8Ω ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 20196103 ...

Page 3

Connection Diagrams TL Package (2mmx2mmx0.6mm) 20196101 Top View Order Number LM4674ATL See NS Package Number TL1611A LM4674ATL Markings 20196125 Top View digit datecode TT = Die traceability G = Boomer Family I2 = LM4674ATL 3 www.national.com ...

Page 4

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility, all other pins (Note 4) ESD Susceptibility (Note 5) Electrical Characteristics V ...

Page 5

Electrical Characteristics V The following specifications apply for 25˚C. (Continued) A Symbol Parameter P Output Power O THD+N Total Harmonic Distortion PSRR Power Supply Rejection Ratio CMRR Common Mode Rejection Ratio η Efficiency Crosstalk SNR Signal to ...

Page 6

External Components Description (Figure 1) Components 1. C Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing S section for information concerning proper placement and selection of the supply bypass capacitor Input AC ...

Page 7

Block Diagrams 7 20196137 www.national.com ...

Page 8

Block Diagrams (Continued) www.national.com Differential Input Configuration 8 20196138 ...

Page 9

Typical Performance Characteristics THD+N vs Output Power f = 1kHz 24dB THD+N vs Output Power f= 1kHz 24dB THD+N vs Frequency V = 2.5V 100mW OUT = 8Ω ...

Page 10

Typical Performance Characteristics THD+N vs Frequency 375mW OUT THD+N vs Frequency V = 3.6V 250mW OUT Efficiency vs. Output Power R = 4Ω 1kHz L www.national.com (Continued) ...

Page 11

Typical Performance Characteristics Power Dissipation vs. Output Power R = 4Ω 1kHz L Output Power vs. Supply Voltage R = 4Ω 1kHz L PSRR vs. Frequency V = 3.6V 200mV DD RIPPLE (Continued) Power ...

Page 12

Typical Performance Characteristics CMRR vs. Frequency V = 3.6V P-P www.national.com (Continued) Supply Current vs. Supply Voltage , R = 8Ω L 20196157 12 No Load 20196158 ...

Page 13

Application Information GENERAL AMPLIFIER FUNCTION The LM4674A stereo Class D audio power amplifier features a filterless modulation scheme that reduces external compo- nent count, conserving board space and reducing system cost. The outputs of the device transition from V with ...

Page 14

Application Information PCB LAYOUT GUIDELINES As output power increases, interconnect resistance (PCB traces and wires) between the amplifier, load and power supply create a voltage drop. The voltage loss due to the traces between the LM4674A and the load results ...

Page 15

Application Information (Continued) Differential Input Configuration FIGURE 2. 15 20196126 www.national.com ...

Page 16

Application Information www.national.com (Continued) Single-Ended Input Configuration FIGURE 3. 16 20196138 ...

Page 17

Revision Table Rev 1.0 Date 9/13/06 Initial WEB release. 17 Description www.national.com ...

Page 18

... BANNED SUBSTANCE COMPLIANCE National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C2) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/quality/green. ...

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