LM4980SD/NOPB National Semiconductor, LM4980SD/NOPB Datasheet

IC AMP AUDIO .042W STER AB 10LLP

LM4980SD/NOPB

Manufacturer Part Number
LM4980SD/NOPB
Description
IC AMP AUDIO .042W STER AB 10LLP
Manufacturer
National Semiconductor
Series
Boomer®, PowerWise®r
Type
Class ABr
Datasheet

Specifications of LM4980SD/NOPB

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
42mW x 2 @ 16 Ohm
Voltage - Supply
1.5 V ~ 3.3 V
Features
Depop, Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
10-LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4980SD
LM4980SDTR
© 2005 National Semiconductor Corporation
LM4980
2 Cell Battery, 1mA, 42mW Per Channel High Fidelity
Stereo Headphone Audio Amplifier for MP3 players
General Description
The LM4980 is a stereo headphone audio amplifier, which
when connected to a 3.0V supply, delivers 42mW to a 16Ω
load with less than 1% THD+N. With the LM4980 packaged
in the SD package, the customer benefits include low profile
and small size. This package minimizes PCB area and maxi-
mizes output power.
The LM4980 features circuitry that significantly reduces out-
put transients (“clicks” and “pops”) while driving headphones
during device turn-on and turn-off without costly external
additional circuitry. The LM4980 also includes an externally
controlled low-power consumption active-low shutdown
mode, and thermal shutdown. Boomer audio power amplifi-
ers are designed specifically to use few external compo-
nents and provide high quality output power in a surface
mount package.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DS201429
FIGURE 1. Block Diagram
Key Specifications
Features
n 2-cell 1.5V to 3.3V battery operation
n Unity-gain stable
n “Click and pop” suppression circuitry for shutdown and
n Active low micro-power shutdown
n Thermal shutdown protection circuitry
Applications
n Portable two-cell audio products
n Portable two-cell electronic devices
n Portable MP3 player/recorders
j
j
j
j
j
j
power on/off transient with headphone loads
(RL = 16Ω, V
Output power
Quiescent current (V
Micropower shutdown current
Supply voltage operating range
PSRR
PSRR
@
@
1kHz, V
217Hz, V
DD
= 3.0V, THD+N = 1%)
DD
20142901
DD
DD
= 3.0V
= 3.0V
= 3V)
1.5V
<
www.national.com
V
42mW (typ)
100dB (typ)
0.1µA (typ)
DD
90dB (typ)
1mA (typ)
July 2005
<
3.3V

Related parts for LM4980SD/NOPB

LM4980SD/NOPB Summary of contents

Page 1

... Boomer audio power amplifi- ers are designed specifically to use few external compo- nents and provide high quality output power in a surface mount package. Typical Application Boomer ® registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation Key Specifications j Output power (RL = 16Ω ...

Page 2

Connection Diagram www.national.com SD Package Top View Order Number LM4980SD See NS Package Number SDA10A 2 20142902 ...

Page 3

Typical Connection FIGURE 2. Typical Application Circuit 3 20142903 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 Storage Temperature Input Voltage Power Dissipation (Note 2) ESD Susceptibility(Note 3) ESD Susceptibility (Note 4) Junction Temperature Solder Information Small Outline Package Vapor Phase (60sec) Electrical Characteristics V The following specifications apply for the circuit shown in Figure 2, unless otherwise specified ...

Page 5

Electrical Characteristics V The following specifications apply for the circuit shown in Figure 2, unless otherwise specified. A Limits apply for T = 25˚C. A Symbol Parameter P Output Power (Note Output Voltage Noise NO THD+N Total ...

Page 6

Typical Performance Characteristics (T THD+N vs Frequency V = 1.8V 32Ω THD+N vs Frequency 32Ω THD+N vs Frequency V = 2.4V 16Ω ...

Page 7

Typical Performance Characteristics (T THD+N vs Output Power V = 1.8V 32Ω THD+N vs Output Power 32Ω THD+N vs Output Power V = 2.4V 16Ω ...

Page 8

Typical Performance Characteristics (T PSRR vs Frequency V = 1.8V 32Ω, 4.7µ PSRR vs Frequency 32Ω, 4.7µ PSRR vs Frequency V = 2.4V 32Ω, 1µ ...

Page 9

Typical Performance Characteristics (T Crosstalk vs Frequency V = 1.8V 32Ω OUT Channel A Driven, Channel B Measured Crosstalk vs Frequency V = 2.4V 32Ω OUT Channel A Driven, Channel ...

Page 10

Typical Performance Characteristics (T Crosstalk vs Frequency V = 1.8V 16Ω Channel A Driven, Channel B Measured Crosstalk vs Frequency V = 2.4V 16Ω Channel A Driven, Channel B Measured ...

Page 11

Typical Performance Characteristics (T Output Power vs Supply Voltage R = 32Ω L Output Power vs Load Resistance V = 1.8V DD Output Power vs Load Resistance 25˚C) (Continued) A Output Power vs Supply Voltage ...

Page 12

Typical Performance Characteristics (T Amplifier Dissipation vs Load Dissipation V = 2.4V DD Power Supply Current vs Power Supply Voltage www.national.com = 25˚C) (Continued) A Amplifier Dissipation vs Load Dissipation 20142977 20142979 3.0V ...

Page 13

Application Information AMPLIFIER CONFIGURATION As shown in Figure 1, the LM4980 consists of a stereo pair of audio amplifiers. These amplifiers operate on a single supply and have single-ended inputs and outputs. The qui- escent operating point of each amplifier ...

Page 14

Application Information tivating shutdown ’s value increases, output COUPLING transient magnitude can also increase. This increase can be mitigated by a corresponding increase in C minimum starting point when selecting C 6.8µF when using 220µF output coupling capacitors. ...

Page 15

Application Information routing refers to using individual traces to feed power and ground to each circuit or even device. This technique will require a greater amount of design time but will not increase the final price of the board. The ...

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www.national.com 16 ...

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Suggested PCB Layout 20142982 FIGURE 6. Top Layer 20142983 FIGURE 7. Bottom Layer 17 www.national.com ...

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Suggested PCB Layout www.national.com (Continued) FIGURE 8. Silkscreen Layer FIGURE 9. Top Layer Pads 18 20142984 20142988 ...

Page 19

Revision History Rev Date 1.0 6/08/05 Initial release. 1.1 6/29/05 Correct typographical and schematic errors. Re-released D/S to the WEB. 1.2 7/18/05 Replaced curves 20142971 and 72 with 20142990 and 91 respectively, then re-released D/S to the WEB. Description 19 ...

Page 20

... 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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