lm4995tmx National Semiconductor Corporation, lm4995tmx Datasheet

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lm4995tmx

Manufacturer Part Number
lm4995tmx
Description
Boomer-r Audio Power Amplifier Series1.3 W Audio Power Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet

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LM4995TMX
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© 2007 National Semiconductor Corporation
LM4995
1.3 W Audio Power Amplifier
General Description
The LM4995 is an audio power amplifier primarily designed
for demanding applications in mobile phones and other
portable communication device applications. It is capable of
delivering 1.2W of continuous average power to an 8Ω BTL
load with less than 1% distortion (THD+N) from a 5V
supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4995 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 LM4995 features a low-power consumption shutdown
mode, which is achieved by driving the shutdown pin with
logic low. Additionally, the LM4995 features an internal ther-
mal shutdown protection mechanism.
The LM4995 contains advanced pop & click circuitry which
eliminates noise which would otherwise occur during turn-on
and turn-off transitions.
The LM4995 is unity-gain stable and can be configured by
external gain-setting resistors.
Boomer® is a registered trademark of National Semiconductor Corporation.
201599
DC
power
Key Specifications
Features
Applications
■ 
■ 
Output Power at 5.0V, 1% THD+N, 8Ω
■ 
Output Power at 3.6V, 1% THD+N, 8Ω
■ 
Available in space-saving 0.4mm pitch μSMD package
Ultra low current shutdown mode
BTL output can drive capacitive loads
Improved pop & click circuitry eliminates noise during turn-
on and turn-off transitions
2.4 - 5.5V operation
No output coupling capacitors, snubber networks or
bootstrap capacitors required
Unity-gain stable
External gain configuration capability
LLP package: 0.5mm pitch, 3 x 3 mm
Mobile Phones
PDAs
Portable electronic devices
PSRR at 3.6V (217Hz & 1kHz)
Shutdown Current
September 2007
www.national.com
625mW (typ)
0.01µA (typ)
1.3W (typ)
75dB

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lm4995tmx Summary of contents

Page 1

... The LM4995 is unity-gain stable and can be configured by external gain-setting resistors. Boomer® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation Key Specifications ■  PSRR at 3.6V (217Hz & 1kHz) ■ ...

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Typical Application FIGURE 1. Typical Audio Amplifier Application Circuit www.national.com 201599d3 2 ...

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Connection Diagrams TM Package Top View Order Number LM4995TM See NS Package Number TMD09AAA SD Package Top View Order Number LM4995SD See NS Package Number SDA08A 20159903 V - Die Traceability G - Boomer Family 20159957 Z - Assembly Plant ...

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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 10) Storage Temperature Input Voltage Power Dissipation (Notes 3, 11) ESD Susceptibility (Note 4) ESD Susceptibility ...

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Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T Symbol Parameter I Quiescent Power Supply Current DD I Shutdown Current SD V Output Offset Voltage OS P Output ...

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Typical Performance Characteristics THD+N vs Output Power THD+N vs Output Power THD+N vs Frequency V = 3.6V 1kHz 300mW O www.national.com = ...

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PSRR vs Frequency = 8Ω 3V 20159950 PSRR vs Frequency = 8Ω 5V 20159951 Power Dissipation vs Output Power = 8Ω 3.6V 20159908 PSRR vs ...

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Output Level vs Frequency Response (Three different caps) Shutdown Voltage 3.6V DD Shutdown Voltage www.national.com 20159906 SDIH 20159947 SDIL 20159939 8 Shutdown Voltage V SDIH 20159936 Shutdown Voltage ...

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Shutdown Voltage V SDIL 20159940 Output Power vs Supply Voltage = 8Ω 20159907 www.national.com ...

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Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 1, the LM4995 has two internal opera- tional amplifiers. The first amplifier's gain is externally config- urable, while the second amplifier is internally fixed in a unity- gain, inverting configuration. The ...

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Figure 1. The input coupling capacitor, C high pass filter which limits low frequency response. This val- ue should be chosen based on needed frequency response for a few ...

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FIGURE 3. DIFFERENTIAL AMPLIFIER CONFIGURATION FOR LM4995 www.national.com FIGURE 2. HIGHER GAIN AUDIO AMPLIFIER 12 201599d4 201599d5 ...

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FIGURE 4. REFERENCE DESIGN BOARD SCHEMATIC 13 201599d6 www.national.com ...

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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 the final ...

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Revision History Rev 1.0 1.1 1.2 1.3 1.4 Date 04/05/06 Initial WEB released of the datasheet. 05/17/06 Added the SD package. 08/07/06 08/22/06 Edited the THD+N Typical values on the 3 EC tables, then re-released the the ...

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Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TM Package Order Number LM4995TM NS Package Number TMD09AAA SDPackage Order Number LM4995SD NS Package Number SDA08A 16 ...

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Notes 17 www.national.com ...

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... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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