LM4871LD/NOPB National Semiconductor, LM4871LD/NOPB Datasheet

IC AMP AUDIO PWR 3W MONO AB 8LLP

LM4871LD/NOPB

Manufacturer Part Number
LM4871LD/NOPB
Description
IC AMP AUDIO PWR 3W MONO AB 8LLP
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4871LD/NOPB

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
3W x 1 @ 3 Ohm
Voltage - Supply
2 V ~ 5.5 V
Features
Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
8-LLP
Amplifier Class
AB
No. Of Channels
1
Output Power
2.38W
Supply Voltage Range
2V To 5.5V
Load Impedance
3ohm
Operating Temperature Range
-40°C To +85°C
Amplifier Case Style
LLP
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4871LD
LM4871LDTR

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© 2004 National Semiconductor Corporation
LM4871
3W Audio Power Amplifier with Shutdown Mode
General Description
The LM4871 is a mono bridged audio power amplifier ca-
pable of delivering 3W of continuous average power into a
3Ω load with less than 10% THD when powered by a 5V
power supply (Note 1). To conserve power in portable appli-
cations, the LM4871’s micropower shutdown mode (I
0.6µA, typ) is activated when V
DOWN pin.
Boomer audio power amplifiers are designed specifically to
provide high power, high fidelity audio output. They require
few external components and operate on low supply volt-
ages from 2.0V to 5.5V. Since the LM4871 does not require
output coupling capacitors, bootstrap capacitors, or snubber
networks, it is ideally suited for low-power portable systems
that require minimum volume and weight.
Additional LM4871 features include thermal shutdown pro-
tection, unity-gain stability, and external gain set.
Note 1: An LM4871LD that has been properly mounted to a circuit board will
deliver 3W into 3Ω (at 10% THD). The other package options for the LM4871
will deliver 1.5W into 8Ω (at 10% THD). See the Application Information
sections for further information concerning the LM4871LD, LM4871MM,
LM4871M, and the LM4871N.
Connection Diagrams
Boomer
See NS Package Number MUA08A, M08A, or N08E
Order Number LM4871MM, LM4871M, or LM4871N
®
is a registered trademark of National Semiconductor Corporation.
MSOP, Small Outline, and DIP Package
Top View
DD
is applied to the SHUT-
10000802
DS100008
Q
=
Key Specifications
n PO at 10% THD+N, 1kHz
n
n
n Shutdown current
n Supply voltage range
n THD at 1kHz at 1W continuous average output power
Features
n No output coupling capacitors, bootstrap capacitors, or
n Unity-gain stable
n LLP, MSOP, SO, or DIP packaging
n External gain configuration capability
n Pin compatible with the LM4861
Applications
n Portable computers
n Desktop computers
n Low voltage audio systems
into 8Ω
snubber circuits required
LM4871LD: 3Ω , 4Ω loads
All other LM4871 packages: 8Ω load
See NS Package Number LDC08A
Order Number LM4871LD
LLP Package
Top View
3W (typ), 2.5W (typ)
10000839
January 2003
www.national.com
2.0V to 5.5V
0.5% (max)
0.6µA (typ)
1.5W (typ)

Related parts for LM4871LD/NOPB

LM4871LD/NOPB Summary of contents

Page 1

... MSOP, Small Outline, and DIP Package Top View Order Number LM4871MM, LM4871M, or LM4871N See NS Package Number MUA08A, M08A, or N08E Boomer ® registered trademark of National Semiconductor Corporation. © 2004 National Semiconductor Corporation Key Specifications 10% THD+N, 1kHz LM4871LD: 3Ω , 4Ω loads n All other LM4871 packages: 8Ω load ...

Page 2

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 2 10000801 ...

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 Supply Temperature Input Voltage Power Dissipation (Note 4) ESD Susceptibility (Note 5) ESD Susceptibility (Note 6) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 4

External Components Description (Figure 1) Components 1. R Inverting input resistance that sets the closed-loop gain in conjunction with R i pass filter with Input coupling capacitor that blocks the DC voltage at the amplifiers input ...

Page 5

Typical Performance Characteristics LD Specific Characteristics LM4871LD Power Dissipation vs Output Power Note 11: This curve shows the LM4871LD’s thermal dissipation ability at different ambient temperatures given the exposed-DAP of the part is soldered to a plane of 1oz. Cu ...

Page 6

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency THD+N vs Output Power Output Power vs Supply Voltage www.national.com (Continued) THD+N vs Output Power 10000805 THD+N vs Output Power 10000807 Output Power vs 10000809 6 10000806 10000808 Supply Voltage 10000810 ...

Page 7

Typical Performance Characteristics Non-LD Specific Characteristics Output Power vs Supply Voltage Power Dissipation vs Output Power Clipping Voltage vs Supply Voltage (Continued) 10000811 Power Derating Curve 10000813 10000815 7 Output Power vs Load Resistance 10000812 10000814 Noise Floor 10000816 www.national.com ...

Page 8

Typical Performance Characteristics Non-LD Specific Characteristics Frequency Response vs Input Capacitor Size Open Loop Frequency Response Application Information EXPOSED-DAP PACKAGE PCB MOUNTING CONSIDERATION The LM4871’s exposed-DAP (die attach paddle) package (LD) provides a low thermal resistance between the die and ...

Page 9

Application Information LD (LLP) package is available from National Semiconduc- tor’s Package Engineering Group under application note AN1187. PCB LAYOUT AND SUPPLY REGULATION CONSIDERATIONS FOR DRIVING 3Ω AND 4Ω LOADS Power dissipated by a load is a function of the ...

Page 10

Application Information POWER SUPPLY BYPASSING As with any amplifier, proper supply bypassing is critical for low noise performance and high power supply rejection. The capacitor location on both the bypass and power supply pins should be as close to the ...

Page 11

Application Information lows the LM4871 to reproduce peaks in excess of 1W with- out producing audible distortion. At this time, the designer must make sure that the power supply choice along with the output impedance does not violate the conditions ...

Page 12

LM4871 MDA MWA 3W Audio Power Amplifier With Shutdown Mode Die/Wafer Characteristics Fabrication Attributes Physical Die Identification Die Step Physical Attributes Wafer Diameter Dise Size (Drawn) Thickness Min Pitch Special Assembly Requirements: Note: Actual die size is rounded to the ...

Page 13

LM4871 MDA MWA 3W Audio Power Amplifier With Shutdown Mode (Continued) IN U.S.A Tel #: Fax: IN EUROPE Tel: Fax: IN ASIA PACIFIC Tel: IN JAPAN Tel: 1 877 Dial Die 1 877 342 5343 1 207 541 6140 49 ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted Order Number LM4871LD See NS Package Number LDC08A Order Number LM4871M NS Package Number M08A 14 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) Order Number LM4871MM NS Package Number MUA08A Order Number LM4871N NS Package Number N08E 15 www.national.com ...

Page 16

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials 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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