lm4893ma National Semiconductor Corporation, lm4893ma Datasheet

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lm4893ma

Manufacturer Part Number
lm4893ma
Description
1.1 Watt Audio Power Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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© 2004 National Semiconductor Corporation
LM4893
1.1 Watt Audio Power Amplifier
General Description
The LM4893 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 1.1 watt of continuous average power to an 8Ω
BTL load with less than 1% distortion (THD+N) 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. The LM4893 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 LM4893 features a low-power consumption global shut-
down mode, which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4893 features an internal
thermal shutdown protection mechanism.
The LM4893 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4893 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
DS200380
DC
Key Specifications
Features
n No output coupling capacitors, snubber networks or
n Unity gain stable
n Ultra low current shutdown mode
n Instantaneous turn-on time
n BTL output can drive capacitive loads up to 100pF
n Advanced pop & click circuitry eliminates noises during
n 2.2V - 5.5V operation
n Available in space-saving µSMD, SO, and MSOP
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
j
j
j
j
bootstrap capacitors required
turn-on and turn-off transitions
packages
Improved PSRR at 5V, 3V, & 217Hz
Higher Power Output at 5V & 1% THD
Higher Power Output at 3V & 1% THD
Shutdown Current
20038001
350mW (typ)
www.national.com
August 2004
0.1µA (typ)
62dB (typ)
1.1W (typ)

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lm4893ma Summary of contents

Page 1

... The LM4893 is unity-gain stable and can be configured by external gain-setting resistors. Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit Boomer is a registered trademark of National Semiconductor Corporation. ® © 2004 National Semiconductor Corporation Key Specifications Improved PSRR at 5V, 3V, & 217Hz j Higher Power Output at 5V & ...

Page 2

... Bump micro SMD Top View Order Number LM4893ITL, LM4893ITLX See NS Package Number TLA09AAA Small Outline (SO) Package Top View Order Number LM4893MA See NS package Number M08A Mini Small Outline (MSOP) Package Top View Connect Order Number LM4893MM See NS Package Number MUB10A www ...

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 9) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note ...

Page 4

Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1 unless otherwise specified. Limits apply for T 25˚C. (Continued) Symbol Parameter N Output Noise OUT Electrical Characteristics V The following specifications apply for the circuit shown ...

Page 5

External Components Description (Figure 1) Components 1. R Inverting input resistance which sets the closed-loop gain in conjunction with R i high pass filter with Input coupling capacitor which blocks the DC voltage at the amplifiers input ...

Page 6

Typical Performance Characteristics THD+N vs Power Out @ V = 5V, 8Ω THD+N vs Power Out @ V = 2.6V, 8Ω www.national.com (Continued) , 1kHz L 20038041 , 1kHz L 20038043 6 THD+N vs Power Out ...

Page 7

Typical Performance Characteristics Power Supply Rejection Ratio (PSRR) Input terminated with 10Ω R Power Supply Rejection Ratio (PSRR) Input terminated with 10Ω R (Continued Power Supply Rejection Ratio (PSRR) DD 20038045 Input terminated with 10Ω R ...

Page 8

Typical Performance Characteristics Power Dissipation vs Output Power V = 3.0V DD Power Derating - MSOP P = 670mW for 5V, 8Ω DMAX www.national.com (Continued) Power Dissipation vs Output Power @ 20038049 Power Derating - SOP P = 670mW for ...

Page 9

Typical Performance Characteristics Power Derating - 9 Bump µSMD P = 670mW for 5V, 8Ω DMAX Output Power vs Supply Voltage (Continued) Output Power vs Supply Voltage 20038081 Output Power vs Load Resistance 20038050 9 20038051 20038074 www.national.com ...

Page 10

Typical Performance Characteristics Clipping (Dropout) Voltage vs Supply Voltage Shutdown Hysterisis Voltage www.national.com (Continued) Supply Current vs Shutdown Voltage 20038052 Shutdown Hysterisis Voltage 20038076 10 20038075 20038077 ...

Page 11

Typical Performance Characteristics Shutdown Hysterisis Voltage V = 2.6V DD Frequency Response vs Input Capacitor Size (Continued) Open Loop Frequency Response 20038078 20038056 11 20038054 www.national.com ...

Page 12

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1 , the LM4893 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 ...

Page 13

Application Information Selection Of Input Capacitor Size Large input capacitors are both expensive and space hungry for portable designs. Clearly, a certain sized capacitor is needed to couple in low frequencies without severe attenu- ation. But in many cases the ...

Page 14

Application Information The LM4893 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 closed-loop differential gain of greater than 10 is required, ...

Page 15

Application Information FIGURE 4. DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4893 FIGURE 5. REFERENCE DESIGN BOARD and LAYOUT - micro SMD (Continued) 15 20038089 20038090 www.national.com ...

Page 16

Application Information LM4893 SO BOARD ARTWORK www.national.com (Continued) Silk Screen 20038098 Top Layer Bottom Layer 20038096 16 20038095 ...

Page 17

Application Information FIGURE 6. REFERENCE DESIGN BOARD and PCB LAYOUT GUIDELINES - MSOP & SO Boards (Continued) 17 20038068 www.national.com ...

Page 18

Application Information LM4893 MSOP DEMO BOARD ARTWORK www.national.com (Continued) Silk Screen 20038065 Top Layer Bottom Layer 20038067 18 20038066 ...

Page 19

Application Information Item Part Number 1 551011208-001 LM4893 Mono Reference Design Board 10 482911183-001 LM4893 Audio AMP 20 151911207-001 Tant Cap 1uF 16V 10 21 151911207-002 Cer Cap 0.39uF 50V Z5U 20% 1210 25 152911207-001 Tant Cap 1.0uF 16V 10 ...

Page 20

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 9-Bump micro SMD Order Number LM4893ITL, LM4893ITLX NS Package Number TLA09AAA ± ± 1.514 0. 1.514 0. ± = 0.60 0.075 3 ...

Page 21

... Physical Dimensions inches (millimeters) unless otherwise noted (Continued) SO Order Number LM4893MA NS Package Number M08A 21 www.national.com ...

Page 22

... 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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