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Details, datasheet, quote on part number:LM4879
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Datasheet text preview:
LM4879 1.1 Watt Audio Power Amplifier
August 2004
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 portable communication device applications. It is capable of delivering 1.1 watt of continuous average power to an 8 BTL load with less than 1% distortion (THD+N) from a 5VDC 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 requirements. The LM4879 features a low-power consumption global shutdown 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.
Key Specifications
j PSRR: 5V, 3V @ 217Hz j Power Output at 5V & 1% THD+N j Power Output at 3V & 1% THD+N j Shutdown Current
62dB (typ) 1.1W (typ) 350mW (typ) 0.1µA (typ)
Features
n No output coupling capacitors, snubber networks or bootstrap capacitors required n Unity gain stable n Ultra low current shutdown mode n Fast turn on: 80ms (typ), 110ms (max) with 1.0µF capacitor n BTL output can drive capacitive loads up to 100pF n Advanced pop & click circuitry eliminates noises during turn-on and turn-off transitions n 2.2V - 5.0V operation n Available in space-saving µSMD, LLP, and MSOP packages
Applications
n Mobile Phones n PDAs n Portable electronic devices
Typical Application
20024301
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS200243
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LM4879
Connection Diagrams
8 Bump micro SMD 8 Bump micro SMD Marking
20024383
20024382
Top View Order Number LM4879IBP, LM4879IBPX See NS Package Number BPA08DDB Mini Small Outline (MSOP) Package
Top View X - Date Code T - Die Traceability G - Boomer Family N- LM4879IBP
MSOP Marking
20024385
20024384
Top View G - Boomer Family 79-LM4879MM
Top View NC = No Connect Order Number LM4879MM See NS Package Number MUB10A 9 Bump micro SMD 9 Bump micro SMD Marking
20024387
Top View X - Date Code T - Die Traceability G - Boomer Family 79 - LM4879IBL
20024386
Top View Order Number LM4879IBL, LM4879IBLX See NS package Number BLA09AAB
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LM4879
Connection Diagrams
(Continued) 9 Bump micro SMD Marking
9 Bump micro SMD
200243B3
Top View X - Date Code T - Die Traceability G - Boomer Family B3 - LM4879ITL
20024386
Top View Order Number LM4879ITL, LM4879ITLX See NS package Number TLA09AAA Leadless Leadframe Package (LLP)
20024302
Top View Order Number LM4879SD See NS Package Number SDC08A
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