lm48411tlx National Semiconductor Corporation, lm48411tlx Datasheet

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lm48411tlx

Manufacturer Part Number
lm48411tlx
Description
Ultra-low Emi, Filterless, 2.5w, Stereo, Class D Audio Power Amplifier With E2s
Manufacturer
National Semiconductor Corporation
Datasheet

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Part Number:
LM48411TLX
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© 2007 National Semiconductor Corporation
LM48411
Ultra-Low EMI, Filterless, 2.5W, Stereo, Class D Audio
Power Amplifier with E
General Description
The LM48411 is a single supply, high efficiency, 2.5W/chan-
nel Class D audio amplifier. The LM48411 features National's
Enhanced Emissions Suppression (E
tures a unique patent-pending ultra low EMI, spread spec-
trum, PWM architecture, that significantly reduces RF emis-
sions while preserving audio quality and efficiency. The E
system improves battery life, reduces external component
count, board area consumption, system cost, and simplifying
design.
The LM48411 is designed to meet the demands of mobile
phones and other portable communication devices. Operat-
ing on a single 5V supply, it is capable of delivering 2.5W/
channel of continuous output power to a 4Ω load with less
than 10% THD+N. Its flexible power supply requirements al-
low operation from 2.4V to 5.5V. The wide band spread
spectrum architecture of the LM48411 reduces EMI-radiated
emissions due to the modulator frequency.
The LM48411 features high efficiency compared to a con-
ventional Class AB amplifier. The E
advanced, patent-pending edge rate control (ERC) architec-
ture that further reduce emissions by minimizing the high
frequency component of the device output, while maintaining
high quality audio reproduction and high efficiency (η = 87%
at V
lectable through GAIN0 and GAIN1 pins.
The LM48411 features a low-power consumption shutdown
mode. Shutdown may be enabled by driving the Shutdown
pin to a logic low (GND).
Output short circuit protection prevents the device from being
damaged during fault conditions. Superior click and pop sup-
pression eliminates audible transients on power up/down and
during shutdown. Independent left/right shutdown control
maximizes power savings in mixed mono/stereo applications.
Boomer® is a registered trademark of National Semiconductor Corporation.
DD
= 3.6V, P
O
= 500mW). Four gain options are pin se-
2
S system includes an
2
S) system, that fea-
300095
2
S
2
S
Key Specifications
Features
Applications
■ 
■ 
■ 
■ 
■ 
■ 
■ 
■ 
E
Efficiency
Output short circuit protection
Stereo Class D Operation
No output filter required for inductive loads
Logic selectable gain
Independent shutdown control
Minimum external components
"Click and pop" suppression circuitry
Micro-power shutdown mode
Available in space-saving 0.5mm pitch micro SMD
package
Mobile phones
PDAs
Portable electronic devices
Efficiency at 3.6V, 500mW into 8Ω
Efficiency at 3.6V, 100mW into 8Ω
Efficiency at 5V, 1W into 8Ω
Quiescent current, 3.6V supply
Power Output at V
Power Output at V
Total shutdown power supply
Single supply range
2
speaker
R
R
S system reduces EMI preserving Audio Quality and
speaker
speaker
current
L
L
= 4Ω, THD
= 8Ω, THD
DD
10%
DD
10%
= 5V
= 5V
November 30, 2007
www.national.com
0.01µA (typ)
2.4V to 5.5V
4.2mA (typ)
2.5W (typ)
1.5W (typ)
87% (typ)
80% (typ)
88% (typ)

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lm48411tlx Summary of contents

Page 1

... Superior click and pop sup- pression eliminates audible transients on power up/down and during shutdown. Independent left/right shutdown control maximizes power savings in mixed mono/stereo applications. Boomer® registered trademark of National Semiconductor Corporation. © 2007 National Semiconductor Corporation 2 S Key Specifications ■ ...

Page 2

LM48411 RF Emissions www.national.com FIGURE 1. RF Emissions — 3in cable 2 30009586 ...

Page 3

Typical Application FIGURE 2. Typical Audio Amplifier Application Circuit 3 30009501 www.national.com ...

Page 4

Connection Diagrams 16 Bump micro SMD Package Top View Order Number LM48411TL See NS Package Number TLA16ACA Pin Descriptions Bump www.national.com micro SMD Marking ...

Page 5

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 1) Storage Temperature Voltage at Any Input Pin V + 0.3V DD Power Dissipation (Note 3) ...

Page 6

Symbol Parameter P Output Power O P Output Power O THD+N Total Harmonic Distortion + Noise Power Supply Rejection Ratio PSRR (Input Referred) SNR Signal to Noise Ratio Output Noise ε (Input Referred) OUT Common Mode Rejection Ratio CMRR (Input ...

Page 7

Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur, including inoperability and degradation of device reliability and/or performance. Functional operation of the device and/or non-degradation at the Absolute Absolute Maximum Ratings or other conditions ...

Page 8

THD+N vs Frequency = 4Ω 3.6V 250mW/channel 6dB V THD+N vs Output Power = 8Ω 2.5V THD+N vs Output Power = 8Ω ...

Page 9

THD+N vs Output Power = 8Ω 5V 6dB 30009582 THD+N vs Output Power = 4Ω 2.5V 6dB 30009572 THD+N vs Output Power = 4Ω, ...

Page 10

THD+N vs Output Power = 4Ω 5.0V PSRR vs Frequency V = 3.6V Quiescent Current vs Power Supply ∞ www.national.com = 6dB V 30009580 = 8Ω L 30009568 30009542 ...

Page 11

Output Power vs Supply Voltage = 8Ω 1kHz R L 30009562 Efficiency vs Output Power = 8Ω 30009570 Power Dissipation vs Output Power = 4Ω 30009566 Efficiency vs Output Power = 4Ω ...

Page 12

External Components Description (Figure 2) Components 1. C Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing section S for information concerning proper placement and selection of the supply bypass capacitor Input AC ...

Page 13

Application Information GENERAL AMPLIFIER FUNCTION The LM48411 features a filterless modulation scheme. The differential outputs of the device switch at 300kHz from V to GND. When there is no input signal applied, the two outputs (V 1 and V 2) ...

Page 14

SHUTDOWN FUNCTION In order to reduce power consumption while not in use, the LM48411 contains shutdown circuitry that reduces current draw to less than 0.01µA. The trigger point for shutdown is shown as a typical value in the Electrical Characteristics ...

Page 15

Build of Materials Designator C1, C2 Ceramic Capacitor 0.1mF, 50V, 10% C3 – C6 Tantalum Capacitors 1mF 20V, 10%, Size A C11 Tantalum Capacitors 10mF 20V, 10% Size B JP1–5, JP8–11 Jumper Header Vertical Mount 2X1 0.100 JP6, JP7 Jumper ...

Page 16

Demonstration Board Schematic www.national.com 16 30009592 ...

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Demonstration Board Layout 30009591 Top Silkscreen Layer 30009590 Top Layer 30009588 Mid 1 Layer 17 www.national.com ...

Page 18

Mid 2 Layer 30009587 Bottom Layer 18 ...

Page 19

Revision History Rev Date 1.0 09/21/07 1.1 10/01/07 1.2 11/30/07 Description Initial release. Fixed few typos. Added the demo boards and BOM. 19 www.national.com ...

Page 20

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted 16 Bump micro SMD Order Number LM48411TL NS Package Number TLA16ACA X1 = 1.996mm X2 = 2.047mm X3 = 0.6mm 20 ...

Page 21

Notes 21 www.national.com ...

Page 22

... 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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