LM4895LD National Semiconductor, LM4895LD Datasheet

IC AMP AUDIO PWR 1.4W MONO 10LLP

LM4895LD

Manufacturer Part Number
LM4895LD
Description
IC AMP AUDIO PWR 1.4W MONO 10LLP
Manufacturer
National Semiconductor
Series
Boomer®r
Type
Class ABr
Datasheet

Specifications of LM4895LD

Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.4W x 1 @ 4 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Features
Depop, Differential Inputs, Shutdown, Thermal Protection
Mounting Type
Surface Mount
Package / Case
10-LLP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
LM4895LD
LM4895LDTR

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© 2002 National Semiconductor Corporation
LM4895
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select and Fixed 6dB Gain
General Description
The LM4895 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 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 LM4895 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 LM4895 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 LM4895 features an internal thermal
shutdown protection mechanism.
The LM4895 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4895 has an internally fixed gain of 6dB.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
DC
power supply.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200232
Key Specifications
Features
n Fully differential amplification
n Internal-gain-setting resistors
n Available in space-saving packages micro SMD, MSOP
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500 pF
n Improved pop & click circuitry eliminates noises during
n 2.2 - 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
20023201
October 2002
400mW(typ.)
www.national.com
0.1µA(typ.)
1.0W(typ.)
80dB

Related parts for LM4895LD

LM4895LD Summary of contents

Page 1

... The LM4895 has an internally fixed gain of 6dB. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer ® registered trademark of National Semiconductor Corporation. © 2002 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

... Bump micro SMD Package 20023236 Top View Order Number LM4895IBP See NS Package Number BPA09CDB LLP Package 20023235 Top View Order Number LM4895LD See NS Package Number LDA10B Mini Small Outline (MSOP) Package 20023223 Top View Order Number LM4895MM See NS Package Number MUB10A 2 ...

Page 3

... and 8Ω load unless otherwise specified. Limits apply for T DD Conditions GND shutdown THD = 1% (max kHz LM4895LD 4Ω (Note 11) L LM4895 8Ω 0.4 Wrms 1kHz 200mV sine p-p ripple f = 217Hz (Note 9) f =1kHz (Note 217Hz (Note 10) f =1kHz (Note 10) ...

Page 4

... Note 8: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase I Note 9: Unterminated input. Note 10: 10Ω terminated input. Note 11: When driving 4Ω loads from a 5V supply, the LM4895LD must be mounted to a circuit board. External Components Description Components 1 ...

Page 5

... THD+N vs Frequency 5V, 8Ω and PWR = 400mW DD L THD+N vs Frequency 3V, 4Ω and PWR = 225mW DD L (Continued) Power Derating Curve 20023211 V = 3V, 8Ω 20023213 V = 2.6V, 8Ω 20023231 5 LM4895LD 20023212 THD+N vs Frequency , and PWR = 250mW L 20023230 THD+N vs Frequency , and PWR = 150mW L 20023232 www.national.com ...

Page 6

Typical Performance Characteristics Non-LD Specific Characteristics THD+N vs Frequency 2.6V, 4Ω and PWR = 150mW DD L THD+N vs Output Power 3V, 8Ω THD+N vs Output Power ...

Page 7

Typical Performance Characteristics Non-LD Specific Characteristics Power Supply Rejection Ratio (PSRR) V Input 10Ω Terminated Power Supply Rejection Ratio (PSRR) V Input 10Ω Terminated Output Power vs Supply Voltage (Continued Power Supply Rejection Ratio (PSRR 20023275 ...

Page 8

Typical Performance Characteristics Non-LD Specific Characteristics Power Dissipation vs Output Power Power Dissipation vs Output Power Supply Current vs Shutdown Voltage Shutdown Low www.national.com (Continued) Power Dissipation vs 20023281 20023283 Supply Current vs Shutdown Voltage 20023285 8 Output Power 20023282 ...

Page 9

Typical Performance Characteristics Non-LD Specific Characteristics Clipping (Dropout) Voltage vs Supply Voltage Power Derating Curve Input CMRR vs Frequency (Continued) Open Loop Frequency Response 20023287 20023289 Input CMRR vs Frequency 20023291 9 20023288 Noise Floor 20023290 20023292 www.national.com ...

Page 10

Typical Performance Characteristics Non-LD Specific Characteristics PSRR vs DC Common-Mode Voltage THD vs Common-Mode Voltage www.national.com (Continued) DC Common-Mode Voltage 20023293 Common-Mode Voltage 20023295 10 PSRR vs 20023294 THD vs 20023296 ...

Page 11

Application Information DIFFERENTIAL AMPLIFIER EXPLANATION The LM4895 is a fully differential audio amplifier that fea- tures differential input and output stages. Internally this is accomplished by two circuits: a differential amplifier and a common mode feedback amplifier that adjusts the ...

Page 12

Application Information However, a direct consequence of the increased power de- livered to the load by a bridge amplifier is an increase in internal power dissipation versus a single-ended amplifier operating at the same conditions 4*(V ...

Page 13

Physical Dimensions inches (millimeters) unless otherwise noted X1 = 1.336 9-Bump micro SMD Order Number LM4895IBP NS Package Number BPA09CDB ± ± 0. 1.361 0. 0.850 13 ± 0.10 www.national.com ...

Page 14

... Physical Dimensions www.national.com inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4895LD NSPackage Number LDA10B 14 ...

Page 15

... 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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