LM4906LD National Semiconductor, LM4906LD Datasheet

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LM4906LD

Manufacturer Part Number
LM4906LD
Description
1W/ Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
Manufacturer
National Semiconductor
Datasheet

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© 2003 National Semiconductor Corporation
LM4906
1W, Bypass-Capacitor-less Audio Amplifier with Internal
Selectable Gain
General Description
The LM4906 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 1W of continuous average power to an 8Ω BTL
load with less than 1% distortion (THD+N) from a +5V power
supply.
The LM4906 is the first National Semiconductor Boomer
Power Amplifier that does not require an external PSRR
bypass capacitor. The LM4906 also has an internal select-
able gain of either 6dB or 12dB. In addition, no output
coupling capacitors or bootstrap capacitors are required
which makes the LM4906 ideally suited for cell phone and
other low voltage portable applications.
The LM4906 contains advanced pop and click circuitry that
eliminates noise, which would otherwise occur during
turn-on and turn-off transitions.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4906 features a low -power
consumption shutdown mode (the part is enabled by pulling
the SD pin high). Additionally, the LM4906 features an inter-
nal thermal shutdown protection mechanism.
Typical Application
Boomer
®
is a registered trademark of National Semiconductor Corporation.
FIGURE 1. Typical Audio Amplifier Application Circuit
DS200571
Key Specifications
Features
n Selectable gain of 6dB (2V/V) or 12dB (4V/V)
n No output or PSRR bypass capacitors required
n Improved “Click and Pop” suppression circuitry
n Very fast turn on time: 5ms (typ)
n Minimum external components
n 2.6 - 5.5V operation
n BTL output can drive capacitive loads
n Ultra low current shutdown mode (SD Low)
Applications
n Portable computers
n Desktop computers
n Multimedia monitors
j
j
j
j
Improved PSRR at 217Hz for +3V
Power Output at +5V, THD+N = 1%, 8Ω
Power Output at +3V, THD+N = 1%, 8Ω 390mW (typ)
Total shutdown power supply current
200571B9
www.national.com
0.1µA (typ)
1.0W (typ)
May 2003
71dB

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LM4906LD Summary of contents

Page 1

... BTL load with less than 1% distortion (THD+N) from a +5V power supply. The LM4906 is the first National Semiconductor Boomer Power Amplifier that does not require an external PSRR bypass capacitor. The LM4906 also has an internal select- able gain of either 6dB or 12dB ...

Page 2

... Connection Diagrams MSOP Package Top View Order Number LM4906MM See NS Package Number MUB08A LLP Package Top View Order Number LM4906LD See NS Package Number LDA10B www.national.com MSOP Marking 20057102 Z - Plant Code X - Date Code T - Die Traceability Z - Plant Code XY - Date Code T - Die Traceability 200571C3 ...

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 10) Storage Temperature Input Voltage Power Dissipation (Notes 3, 11) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Electrical Characteristics V The following specifications apply for the circuit shown in Figure 1, unless otherwise specified ...

Page 4

Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, ...

Page 5

Typical Performance Characteristics THD+N vs Frequency 8Ω 1kHz, PWR = 500mW THD+N vs Power Out 8Ω 1kHz DD L Power Supply Rejection Ratio vs ...

Page 6

Typical Performance Characteristics Noise Floor 8Ω 80kHz Bandwith, Input to GND Power Dissipation vs Output Power, V Shutdown Hysteresis Voltage V = 5V, SD Mode = V DD www.national.com (Continued) 200571D0 = 5V ...

Page 7

Typical Performance Characteristics Shutdown Hysteresis Voltage V = 3V, SD Mode = Output Power vs Supply Voltage Output Power vs Supply Voltage (Continued) (High) 200571E5 = 8Ω 200571D7 = 32Ω 200571D8 7 Shutdown ...

Page 8

Typical Performance Characteristics PSRR Distribution 1kHz PSRR Distribution 1kHz www.national.com (Continued) = 8Ω L 200571F4 = 8Ω L 200571F6 8 PSRR Distribution V = 5V, f ...

Page 9

Application Information BRIDGE CONFIGURATION EXPLANATION As shown in Figure 2, the LM4906 has two internal opera- tional amplifiers. The first amplifier’s gain is either 6dB or 12dB depending on the gain select input (Low = 6dB, High = 12dB). The ...

Page 10

Application Information C A larger input coupling capacitor requires more charge to i. reach its quiescent DC voltage (nominally 1/2 V charge comes from the output via the feedback and is apt to create pops upon device enable. Thus, by ...

Page 11

Application Information LM4906 MSOP DEMO BOARD ARTWORK (Continued) Top Layer Bottom Layer 11 200571E6 200571E7 www.national.com ...

Page 12

Application Information LM4906 LD DEMO BOARD ARTWORK www.national.com (Continued) Top Layer Bottom Layer 12 200571E8 200571E9 ...

Page 13

Application Information Part Description LM4906 Audio Amplifier Tantalum Capcitor, 1µF Ceramic Capacitor, 0.39µF Jumper Header Vertical Mount 2X1 0.100“ spacing PCB LAYOUT GUIDELINES This section provides practical guidelines for mixed signal PCB layout that involves various digital/analog power and ground ...

Page 14

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted MSOP Order Number LM4906MM NS Package Number MUA08A 14 ...

Page 15

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted (Continued) LLP Order Number LM4906LD NS Package Number LDA10B 2. A critical component is any component of a life ...

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