LM4861M National Semiconductor, LM4861M Datasheet

Audio Power Amplifier IC

LM4861M

Manufacturer Part Number
LM4861M
Description
Audio Power Amplifier IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4861M

No. Of Channels
1
Output Power
1.1W
Load Impedance
8ohm
Amplifier Case Style
SOIC
No. Of Pins
8
Output Power Pout
1.1W
Mounting Type
Surface Mount
Supply Voltage Min
2V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 1999 National Semiconductor Corporation
LM4861
1.1W Audio Power Amplifier with Shutdown Mode
General Description
The LM4861 is a bridge-connected audio power amplifier ca-
pable of delivering 1.1W of continuous average power to an
8
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components using surface mount packaging. Since
the LM4861 does not require output coupling capacitors,
bootstrap capacitors, or snubber networks, it is optimally
suited for low-power portable systems.
The LM4861 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism.
The unity-gain stable LM4861 can be configured by external
gain-setting resistors.
Typical Application
Boomer
FIGURE 1. Typical Audio Amplifier Application Circuit
load with 1% (THD) using a 5V power supply.
®
is a registered trademark of National Semiconductor Corporation.
DS011986
DS011986-1
Key Specifications
Features
n No output coupling capacitors, bootstrap capacitors, or
n Small Outline (SO) packaging
n Compatible with PC power supplies
n Thermal shutdown protection circuitry
n Unity-gain stable
n External Gain Configuration Capability
Applications
n Personal computers
n Portable consumer products
n Self-powered speakers
n Toys and games
Connection Diagram
n THD at 1 kHz at 1W continuous
n Output power at 10% THD+N
n Shutdown Current
snubber circuits are necessary
average output power into 8
at 1 kHz into 8
See NS Package Number M08A
Order Number LM4861M
Small Outline Package
Top View
DS011986-2
www.national.com
0.6 µA (typ)
1.0% (max)
1.5W (typ)
May 1997

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LM4861M Summary of contents

Page 1

... External Gain Configuration Capability Applications n Personal computers n Portable consumer products n Self-powered speakers n Toys and games Connection Diagram Small Outline Package Top View Order Number LM4861M See NS Package Number M08A DS011986-1 May 1997 1.0% (max) 1.5W (typ) 0.6 µA (typ) DS011986-2 www.national.com ...

Page 2

... 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 Soldering Information Small Outline Package Vapor Phase (60 sec ...

Page 3

High Gain Application Circuit FIGURE 2. Audio Ampiifier with A Single Ended Application Circuit *C and C size depend on specific application requirements and constraints. Typical vaiues **Pin 1 should be connected disable ...

Page 4

External Components Description Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R i high pass filter with Input coupling capacitor which blocks DC voltage at the amplifier’s input terminals. Also creates ...

Page 5

Typical Performance Characteristics Output Power vs Load Resistance DS011986-17 Noise Floor vs Frequency DS011986-14 Power Derating Curve DS011986-13 (Continued) Output Power vs Supply Voltage DS011986-18 Supply Current Distribution vs Temperature DS011986-15 Power Supply Rejection Ratio DS011986-20 5 Power Dissipation vs ...

Page 6

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1 , the LM4861 has two operational am- plifiers internally, allowing for a few different amplifier con- figurations. The first amplifier’s gain is externally config- urable, while the second amplifier is ...

Page 7

Application Information (Continued) tion of R and C will cause rolloff before 20 kHz. A typical f f combination of feedback resistor and capacitor that will not produce audio band high frequency rolloff pF. These ...

Page 8

... NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant ...

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