lm4898mmx National Semiconductor Corporation, lm4898mmx Datasheet

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lm4898mmx

Manufacturer Part Number
lm4898mmx
Description
1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2003 National Semiconductor Corporation
LM4898
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General Description
The LM4898 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 1 watt of continuous average
power to an 8Ω BTL load with less than 1% distortion
(THD+N) from a 5V
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4898 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4898 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4898 features an internal thermal
shutdown protection mechanism.
The LM4898 contains advanced pop & click circuitry which
virtually eliminates noises which would otherwise occur dur-
ing turn-on and turn-off transitions.
Connection Diagrams
Boomer
®
is a registered trademark of National Semiconductor Corporation.
Mini Small Outline (MSOP) Package
See NS Package Number MUB10A
Order Number LM4898MM
DC
power supply.
Top View
DS200737
20073723
Key Specifications
Features
n Fully differential amplification
n Available in space-saving packages micro SMD, MSOP,
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry eliminates noises during
n 2.4 - 5.5V operation
n No output coupling capacitors, snubber networks or
n Shutdown high or low selectivity
Applications
n Mobile phones
n PDAs
n Portable electronic devices
j
j
j
j
and LLP
turn-on and turn-off transitions
bootstrap capacitors required
Improved PSRR at 217Hz
Power Output at 5.0V & 1% THD
Power Output at 3.3V & 1% THD
Shutdown Current
TT - Die Run Traceability
G - Boomer Family
Z -Assembly Code
B3 - LM4898MM
MSOP Marking
X - Date Code
20073774
www.national.com
400mW(typ)
0.1µA(typ)
83dB(typ)
1.0W(typ)
July 2003

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lm4898mmx Summary of contents

Page 1

... Connection Diagrams Mini Small Outline (MSOP) Package Top View Order Number LM4898MM See NS Package Number MUB10A Boomer ® registered trademark of National Semiconductor Corporation. © 2003 National Semiconductor Corporation Key Specifications j Improved PSRR at 217Hz j Power Output at 5.0V & 1% THD j Power Output at 3.3V & ...

Page 2

Connection Diagrams LLP Package Top View Order Number LM4898LD See NS Package Number LDA10B 9 Bump micro SMD Package Top View Order Number LM4898ITL, LM4898ITLX See NS Package Number TLA09AAA www.national.com (Continued) 20073735 20073736 2 LD Marking 20073756 Z- Assembly ...

Page 3

Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit 3 20073701 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 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction ...

Page 5

Electrical Characteristics V The following specifications apply for V 25˚C. Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD P Output Power o THD+N Total Harmonic Distortion+Noise PSRR Power Supply Rejection Ratio CMRR Common-Mode Rejection Ratio V ...

Page 6

Typical Performance Characteristics LD Specific Characteristics THD+N vs Output Power 4Ω LM4898LD Power Dissipation vs Output Power www.national.com THD+N vs Frequency 200737A1 Power Derating Curve 200737A4 6 = ...

Page 7

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency 8Ω 400mW THD+N vs Frequency 4Ω 225mW THD+N vs Frequency V ...

Page 8

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Output Power 8Ω THD+N vs Output Power V = 2.6V PSRR vs Frequency 8Ω, Input 10Ω Terminated ...

Page 9

Typical Performance Characteristics Non-LD Specific Characteristics Output Power vs Supply Voltage R = 8Ω L Power Dissipation vs Output Power Power Dissipation vs Output Power (Continued) Output Power vs Supply Voltage 200737D3 200737D6 200737D8 4Ω L 200737D5 ...

Page 10

Typical Performance Characteristics Non-LD Specific Characteristics Supply Current vs Shutdown Voltage Shutdown Low Clipping (Dropout) Voltage vs Supply Voltage Power Derating Curve www.national.com (Continued) Supply Current vs Shutdown Voltage 200737E0 Open Loop Frequency Response 200737E2 200737E4 10 Shutdown High 200737E1 ...

Page 11

Typical Performance Characteristics Non-LD Specific Characteristics CMRR vs Frequency 8Ω, 200mV DD L PSRR vs Common Mode Voltage Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4898 is a fully differential audio amplifier ...

Page 12

Application Information amplifier is not current limited or clipped. In order to choose an amplifier’s closed-loop gain without causing excess clip- ping, please refer to the Audio Power Amplifier Design sec- tion. A bridged configuration, such as the one used ...

Page 13

Application Information function of output power. If typical operation is not around the maximum power dissipation point, the LM4898 can operate at higher ambient temperatures. Refer to the Typical Perfor- mance Characteristics curves for power dissipation informa- tion. POWER SUPPLY ...

Page 14

Application Information AUDIO POWER AMPLIFIER DESIGN Design a 1W/8Ω Audio Amplifier Given: • Power Output • Load Impedance • Input Level • Input Impedance • Bandwidth 100Hz–20kHz A designer must first determine the minimum supply rail to obtain the specified ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted LLP Order Number LM4898LD NSPackage Number LDA10B 15 www.national.com ...

Page 16

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) Mini Small Outline (MSOP) Order Number LM4898MM NSPackage Number MUB10A 16 ...

Page 17

... 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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