LM4860M National Semiconductor, LM4860M Datasheet

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LM4860M

Manufacturer Part Number
LM4860M
Description
Audio Power Amplifier IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LM4860M

No. Of Channels
1
Output Power
1.15W
Load Impedance
8ohm
Amplifier Case Style
SOIC
No. Of Pins
16
Output Power Pout
1.15W
Mounting Type
Surface Mount
Supply Voltage Min
2.7V
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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© 1999 National Semiconductor Corporation
LM4860
Series 1W Audio Power Amplifier with Shutdown Mode
General Description
The LM4860 is a bridge-connected audio power amplifier ca-
pable of delivering 1W of continuous average power to an
8 load with less than 1% (THD+N) over the audio spectrum
from a 5V power supply.
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 LM4860 does not require output coupling capacitors,
bootstrap capacitors or snubber networks, it is optimally
suited for low-power portable systems.
The LM4860 features an externally controlled, low-power
consumption shutdown mode, as well as an internal thermal
shutdown protection mechanism. It also includes two head-
phone control inputs and a headphone sense output for ex-
ternal monitoring.
The unity-gain stable LM4860 can be configured by external
gain setting resistors for differential gains of 1 to 10 without
the use of external compensation components.
Key Specifications
n THD+N at 1W continuous average
Typical Application
The Boomer
Patents pending.
FIGURE 1. Typical Audio Amplifier Application Circuit
®
registered trademark is licensed to National Semiconductor for audio integrated circuits by Rockford Corporation.
DS011988
DS011988-1
n Instantaneous peak output power:
n Shutdown current: 0.6 µA (typ)
Features
n No output coupling capacitors, bootstrap capacitors, or
n Small Outline (SO) power packaging
n Compatible with PC power supplies
n Thermal shutdown protection circuitry
n Unity-gain stable
n External gain configuration capability
n Two headphone control inputs and headphone sensing
Applications
n Personal computers
n Portable consumer products
n Cellular phones
n Self-powered speakers
n Toys and games
Connection Diagram
output power into 8 : 1% (max)
snubber circuits are necessary
output
See NS Package Number M16A
Order Number LM4860M
Small Outline Package
Top View
>
2W
DS011988-2
www.national.com
August 1994

Related parts for LM4860M

LM4860M Summary of contents

Page 1

... Two headphone control inputs and headphone sensing output Applications n Personal computers n Portable consumer products n Cellular phones n Self-powered speakers n Toys and games Connection Diagram Small Outline Package Top View Order Number LM4860M See NS Package Number M16A DS011988-1 August 1994 > 2W DS011988-2 www.national.com ...

Page 2

... Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: The quiescent power supply current depends on the offset voltage when a practical load is connected to the amplifier. Note 9: Shutdown current has a wide distribution. For Power Management sensitive designs, contact your local National Semiconductor Sales Office. www.national.com ...

Page 3

High Gain Application Circuit FIGURE 2. Stereo Amplifier with A Single Ended Application Circuit * C and C size depend on specific application requirements and constraints. Typical values Pin should be ...

Page 4

Single Ended Application Circuit External Components Description ( Figures Components 5. C Bypass pin capacitor which provides half supply filtering. Refer to Application Information section for B proper placement and selection of bypass capacitor (Note ...

Page 5

Typical Performance Characteristics LM4860 Noise Floor vs Frequency DS011988-18 Output Power vs Load Resistance DS011988-21 Power Supply Rejection Ratio DS011988-24 Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1 , the LM4860 has two operational am- plifiers internally, allowing ...

Page 6

Application Information supply voltage. Consequently, four times the output power is possible as compared to a single-ended amplifier under the same conditions. This increase in attainable output power assumes that the amplifier is not current limited or clipped. In order ...

Page 7

Application Information (Continued) ground resulting from the music coming from the headphone amplifier. The output coupling cap protects the headphones by blocking the amplifier’s half-supply DC voltage. The ca- pacitor also protects the headphone amplifier from the low voltage set ...

Page 8

Application Information HIGHER GAIN AUDIO AMPLIFIER The LM4860 is unity-gain stable and requires no external components besides gain-setting resistors, an input coupling capacitor, and proper supply bypassing in the typical appli- cation. However if a closed-loop differential gain of greater ...

Page 9

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. Small Outline Package (M) Order Number LM4860M NS Package Number M16A 2. A critical component is any component of a life ...

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