LM4879SDBD National Semiconductor, LM4879SDBD Datasheet

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LM4879SDBD

Manufacturer Part Number
LM4879SDBD
Description
BOARD EVALUATION LM4879SD
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4879SDBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.1W x 1 @ 8 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4879
Lead Free Status / RoHS Status
Not applicable / Not applicable
© 2004 National Semiconductor Corporation
LM4879
1.1 Watt Audio Power Amplifier
General Description
The LM4879 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 LM4879 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 LM4879 features a low-power consumption global shut-
down mode, which is achieved by driving the shutdown pin
with logic low. Additionally, the LM4879 features an internal
thermal shutdown protection mechanism.
The LM4879 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4879 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
DS200243
DC
Key Specifications
Features
n No output coupling capacitors, snubber networks or
n Unity gain stable
n Ultra low current shutdown mode
n Fast turn on: 80ms (typ), 110ms (max) with 1.0µF
n BTL output can drive capacitive loads up to 100pF
n Advanced pop & click circuitry eliminates noises during
n 2.2V - 5.0V operation
n Available in space-saving µSMD, LLP, and MSOP
Applications
n Mobile Phones
n PDAs
n Portable electronic devices
j
j
j
j
bootstrap capacitors required
capacitor
turn-on and turn-off transitions
packages
PSRR: 5V, 3V
Power Output at 5V & 1% THD+N
Power Output at 3V & 1% THD+N
Shutdown Current
@
217Hz
20024301
October 2004
350mW (typ)
www.national.com
0.1µA (typ)
62dB (typ)
1.1W (typ)

Related parts for LM4879SDBD

LM4879SDBD Summary of contents

Page 1

... The LM4879 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. © 2004 National Semiconductor Corporation Key Specifications j PSRR: 5V Power Output at 5V & 1% THD+N j Power Output at 3V & ...

Page 2

Connection Diagrams 8 Bump micro SMD Top View Order Number LM4879IBP, LM4879IBPX See NS Package Number BPA08DDB Mini Small Outline (MSOP) Package Top View Connect Order Number LM4879MM See NS Package Number MUB10A 9 Bump micro SMD ...

Page 3

Connection Diagrams 9 Bump micro SMD Top View Order Number LM4879ITL, LM4879ITLX See NS package Number TLA09AAA Leadless Leadframe Package (LLP) Top View Order Number LM4879SD See NS Package Number SDC08A (Continued) 20024386 20024302 3 9 Bump micro SMD Marking ...

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 (Note 9) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1 unless otherwise specified ...

Page 5

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 6

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 7

Typical Performance Characteristics THD+N vs Frequency 8Ω, PWR = 250mW DD L THD+N vs Frequency V = 2.6V 8Ω, PWR = 100mW DD L THD+N vs Power Out ...

Page 8

Typical Performance Characteristics THD+N vs Power Out V = 2.6V 8Ω 1kHz DD L Power Supply Rejection Ratio Power Supply Rejection Ratio V = 2.6V DD www.national.com (Continued) THD+N vs Power Out ...

Page 9

Typical Performance Characteristics Power Dissipation vs Output Power Power Dissipation vs Output Power (LLP Package Power Derating - 8 Bump µSMD P = 670mW DMAX 8Ω DD ...

Page 10

Typical Performance Characteristics Power Derating - LLP P = 670mV DMAX Output Power vs Supply Voltage Clipping (Dropout) Voltage vs Supply Voltage www.national.com (Continued 200243B4 20024350 20024352 10 Output Power vs Supply ...

Page 11

Typical Performance Characteristics Shutdown Hysterisis Voltage Shutdown Hysterisis Voltage V = 2.6V DD Frequency Response vs Input Capacitor Size (Continued) Shutdown Hysterisis Voltage 20024376 20024378 20024356 20024377 Open Loop Frequency Response ...

Page 12

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4879 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 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 LM4879 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 3. DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4879 FIGURE 4. REFERENCE DESIGN BOARD and LAYOUT - micro SMD (Continued) 15 20024389 20024390 www.national.com ...

Page 16

Application Information FIGURE 5. REFERENCE DESIGN BOARD and PCB LAYOUT GUIDELINES - MSOP & SO Boards www.national.com (Continued) 16 20024368 ...

Page 17

Application Information LM4879 micro SMD BOARD ARTWORK Silk Screen Bottom Layer Inner Layer V DD (Continued) 20024357 20024359 20024361 17 Top Layer 20024358 Inner Layer Ground 20024360 www.national.com ...

Page 18

Application Information LM4879 MSOP DEMO BOARD ARTWORK Silk Screen Bottom Layer TABLE 1. Mono LM4879 Reference Design Boards Bill of Material for all 3 Demo Boards Item Part Number 1 551011208-001 LM4879 Mono Reference Design Board 10 482911183-001 LM4879 Audio ...

Page 19

Application Information LM4879 LLP DEMO BOARD ARTWORK Silk Screen Bottom Layer (Continued) 200243C2 200243C1 19 Top Layer 200243C0 www.national.com ...

Page 20

Application Information PCB LAYOUT GUIDELINES This section provides practical guidelines for mixed signal PCB layout that involves various digital/analog power and ground traces. Designers should note that these are only "rule-of-thumb" recommendations and the actual results will depend heavily on ...

Page 21

Physical Dimensions inches (millimeters) unless otherwise noted Note: Unless otherwise specified. 1. Epoxy coating. 2. 63Sn/37Pb eutectic bump. 3. Recommend non-solder mask defined landing pad. 4. Pin 1 is established by lower left corner with respect to text orientation pins ...

Page 22

Physical Dimensions Note: Unless otherwise specified. 1. Epoxy coating. 2. 63Sn/37Pb eutectic bump. 3. Recommend non-solder mask defined landing pad. 4. Pin 1 is established by lower left corner with respect to text orientation pins are numbered counterclockwise. 5. Reference ...

Page 23

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4879SD NS Package Number SDC08A 23 www.national.com ...

Page 24

Physical Dimensions X1 = 1.514 www.national.com inches (millimeters) unless otherwise noted (Continued) 9-Bump micro SMD Order Number LM4879ITL LM4879ITLX NS Package Number TLA09AAA ± ± 0. 1.514 0. 0.60 MSOP Order Number LM4879MM NS Package Number ...

Page 25

... BANNED SUBSTANCE COMPLIANCE National Semiconductor certifies that the products and packing materials 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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