LM4954TLX National Semiconductor, LM4954TLX Datasheet

LM4954TLX

Manufacturer Part Number

LM4954TLX

Description

Manufacturer

National Semiconductor

Datasheet

1.LM4954TLX.pdf (16 pages)

Specifications of LM4954TLX

Operational Class

Class-AB

Audio Amplifier Output Configuration

1-Channel Mono

Output Power (typ)

1.2x1@8OhmW

Audio Amplifier Function

Speaker

Total Harmonic Distortion

0.1@8Ohm@600mW%

Single Supply Voltage (typ)

3/5V

Dual Supply Voltage (typ)

Not RequiredV

Power Supply Requirement

Single

Rail/rail I/o Type

Power Supply Rejection Ratio

80dB

Single Supply Voltage (min)

2.7V

Single Supply Voltage (max)

Dual Supply Voltage (min)

Not RequiredV

Dual Supply Voltage (max)

Not RequiredV

Operating Temp Range

-40C to 85C

Operating Temperature Classification

Industrial

Mounting

Surface Mount

Pin Count

Package Type

uSMD

Lead Free Status / RoHS Status

Not Compliant

Current page: 1 of 16
Download datasheet (976Kb)

LM4954

High Voltage 3 Watt Audio Power Amplifier

General Description

The LM4954 is an audio power amplifier primarily designed

for demanding applications in mobile phones and other por-

table communication device applications. It is capable of

delivering 2.4 Watts of continuous average power to an 8Ω

BTL load with less than 1% THD+N from a 7V

supply.

Boomer audio power amplifiers are designed specifically to

provide high quality output power with a minimal number of

external components. The LM4954 does not require output

coupling capacitors or bootstrap capacitors, and therefore is

ideally suited for lower-power portable applications where

minimal space and power consumption are primary require-

ments.

The LM4954 features a low-power consumption global shut-

down mode which is achieved by driving the shutdown pin

with logic low. Additionally, the LM4954 features an internal

thermal shutdown protection mechanism.

The LM4954 contains advanced pop & click circuitry which

eliminates noises that would otherwise occur during turn-on

and turn-off transitions.

The LM4954 is unity-gain stable and can be configured by

external gain-setting resistors.

Typical Application

Boomer

is a registered trademark of National Semiconductor Corporation.

FIGURE 1. Typical Audio Amplifier Application Circuit

DS201291

power

Key Specifications

Features

n No output coupling capacitors, snubber networks or

n Unity gain stable

n Externally configurable gain

n Ultra low current active low shutdown mode

n BTL output can drive capacitive loads up to 100pF

n “Click and pop” suppression circuitry

n 2.7V - 9.0V operation

n Available in space-saving microSMD package

Applications

n Mobile Phones

n PDAs

bootstrap capacitors required

Voltage Range

Wide Power Supply

Output Power: V

Quiescent power supply current

PSRR: V

Shutdown power supply current

= 5V and 3V at 217Hz

= 7V, 1% THD+N

20129111

2.7 ≤ V

www.national.com

0.01µA (typ)

2.4W (typ)

80dB (typ)

June 2005

3mA (typ)

≤ 9V

Related parts for LM4954TLX

LM4954TLX Summary of contents

Page 1

... The LM4954 is unity-gain stable and can be configured by external gain-setting resistors. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2005 National Semiconductor Corporation Key Specifications j Wide Power Supply Voltage Range j Output Power: V ...

Page 2

... Connection Diagrams 9 Bump micro SMD Top View Order Number LM4954TL, LM4954TLX See NS package Number TLA0911A www.national.com 9 Bump micro SMD Marking T - Die Traceability G - Boomer Family 20129186 2 20129191 Top View X - Date Code F2 - LM4954TL ...

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 (Note 1) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for V 25˚ ...

Page 4

Electrical Characteristics V The following specifications apply for V 25˚C. Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Output Offset Voltage OS P Output Power o THD+N Total Harmonic Distortion + Noise PSRR Power Supply ...

Page 5

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, ...

Page 6

Typical Performance Characteristics THD+N vs Output Power 8Ω 1kHz, 80kHz BW THD+N vs Output Power 8Ω 1kHz, 80kHz BW THD+N ...

Page 7

Typical Performance Characteristics THD+N vs Output Power 8Ω 1kHz, 80kHz BW THD+N vs Output Power 4Ω 1kHz, 80kHz ...

Page 8

Typical Performance Characteristics THD+N vs Differential Gain 8Ω 600mW, 80kHz BW OUT PSRR vs Frequency 200mV DD RIPPLE Input Terminated, 80kHz BW Output Power vs Supply ...

Page 9

Typical Performance Characteristics Power Dissipation vs Output Power 6dB THD+N ≤ 1%, 80kHz BW Power Dissipation vs Output Power 6dB THD+N ≤ 1%, 80kHz BW Shutdown ...

Page 10

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4954 has two operational amplifiers internally, allowing for a few different amplifier configurations. The first amplifier’s gain is externally config- urable, while the second amplifier is internally fixed in ...

Page 11

Application Information reproduce signals below 100Hz to 150Hz. Thus, using a large input capacitor may not increase actual system perfor- mance. In addition to system cost and size, click and pop perfor- mance is affected by the size of the ...

Page 12

Application Information FIGURE 3. DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4954 FIGURE 4. REFERENCE DESIGN BOARD SCHEMATIC www.national.com (Continued) 12 20129109 20129110 ...

Page 13

Application Information LM4954 micro SMD BOARD ARTWORK (Note 10) Composite View Top Layer Internal Layer 2, V (Continued) 20129115 20129119 DD 20129117 13 Silk Screen 20129118 Internal Layer 1, GND 20129116 Bottom Layer 20129114 www.national.com ...

Page 14

Application Information TABLE 1. Mono LM4954 Reference Design Boards Bill of Materials Designator Value R 20kΩ 20kΩ 0.39µ 2.2µ 2.2µ ...

Page 15

Revision History Rev 1.1 4/29/05 1.2 6/08/05 1.3 6/15/05 1.4 6/20/05 1.5 6/22/05 Date Added curves 71 and 72. Edited Note 10. Changed Av = 26dB to 6dB under 7V EC table. Edited SHUTDOWN FUNCTION under the Application section. Removed ...

Page 16

... Email: new.feedback@nsc.com Tel: 1-800-272-9959 Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 9-Bump micro SMD Order Number LM4954TL, LM4954TLX NS Package Number TLA0911A ± ± 0. 1.488 0. 0. critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

Related keywords

LM4954TLX datasheet
LM4954TLX data sheet
LM4954TLX pdf datasheet
LM4954TLX component
LM4954TLX part
LM4954TLX distributor
LM4954TLX RoHS
LM4954TLX datasheet download